Efficient heat dissipation oil-immersed transformer

Abstract

The invention relates to the technical field of oil-immersed transformers, in particular to an efficient heat dissipation oil-immersed transformer which comprises a transformer body, an oil conservator and a moisture absorber, the oil conservator and the moisture absorber are fixedly mounted at one end of the top of the transformer body, a first pipeline is fixedly mounted in the oil conservator, and the top of the first pipeline is located at the top end in the oil conservator. A second pipeline fixedly sleeves the outer portion of the bottom end of the first pipeline, an oil receiving barrel is arranged in the second pipeline, strip-shaped limiting grooves are formed in the two ends of the interior of the second pipeline, clamping grooves communicate with the bottoms of one sides of the two strip-shaped limiting grooves, and a connecting mechanism and an anti-disengaging mechanism are arranged at the bottom end and the top end of the oil receiving barrel correspondingly. The moisture absorber has the beneficial effects that oil is collected through the oil receiving barrel, so that the oil can be prevented from entering the moisture absorber, a drying agent in the moisture absorber is prevented from being soaked by the oil and losing efficacy, the oil is also prevented from overflowing through the moisture absorber to pollute equipment, and normal use of the matched moisture absorber in transformer manufacturing is ensured.

Description

Technical Field

[0001] This invention relates to the field of oil-immersed transformer technology, specifically to an oil-immersed transformer with high-efficiency heat dissipation. Background Technology

[0002] An oil-immersed transformer is a power transformer that uses mineral oil (or other insulating oil) as the main insulating and cooling medium. The transformer's cooling primarily relies on the natural convection of the insulating oil, while also possessing highly efficient heat dissipation characteristics: during operation, the heat generated by the core and windings is rapidly transferred to the surrounding insulating oil. The heated oil, due to its lower density, flows upwards. Upon reaching the top of the tank or radiator, the heat is quickly dissipated into the air through the large heat dissipation surfaces of the tank walls and radiators. The cooled oil, with its increased density, then flows downwards back to the core and windings, forming a highly efficient hot and cold oil circulation loop that continuously removes the heat generated during equipment operation, thus achieving efficient heat dissipation.

[0003] Most oil-immersed transformers require an oil conservator. The oil conservator balances changes in oil volume within the transformer, removes air bubbles from the oil, and prevents tank deformation or winding insulation damage. Secondly, it extends equipment life by reducing oil contact with air, slowing oil oxidation and deterioration, and lowering maintenance costs and failure risks. Typically, a pipe is installed in the oil conservator, with its top leading to the top of the conservator's interior. A desiccant is installed at the bottom of this pipe. The transformer manufacturer matches the desiccant with an appropriate moisture absorption capacity based on the humidity conditions of the operating environment, ensuring a consistently dry environment inside the oil conservator and guaranteeing long-term stable transformer operation. When changes in transformer oil temperature cause air to enter or exit the oil conservator, the desiccant (such as silica gel) in the desiccant absorbs moisture from the air, preventing moisture from entering the tank and contaminating the insulating oil, thus reducing its insulation performance. It also filters impurities from the air, preventing them from mixing into the oil and affecting transformer operation. When the transformer oil level rises abnormally (such as a sudden increase in oil temperature causing a large expansion of the transformer oil, or excessive oil filling in the oil tank), the oil level in the oil tank rises, thus entering the interior of the top pipe of the desiccant and then into the desiccant. This causes the desiccant in the desiccant to be soaked in oil and become ineffective, preventing the entry of dry air. It may also cause oil to overflow through the desiccant and contaminate the equipment. Summary of the Invention

[0004] The purpose of this invention is to provide an oil-immersed transformer with high-efficiency heat dissipation to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an oil-immersed transformer with high-efficiency heat dissipation, comprising a transformer body, an oil conservator and a dehumidifier fixedly installed at one top end of the transformer body, wherein a first pipe is fixedly installed inside the oil conservator, the top of the first pipe is located at the top of the oil conservator, the bottom end of the first pipe penetrates the oil conservator and extends to the bottom of the oil conservator, a second pipe is fixedly sleeved outside the bottom end of the first pipe, the dehumidifier is located below the second pipe, an oil receiving cylinder is provided inside the second pipe, both ends of the second pipe are provided with strip-shaped limiting grooves, and the bottom of one side of each of the two strip-shaped limiting grooves is connected to a locking groove, and the bottom and top ends of the oil receiving cylinder are respectively provided with a connecting mechanism and an anti-detachment mechanism.

[0006] Preferably, a mounting plate is fixedly installed at the bottom of the second pipe, and a mounting plate is fixedly installed at the top of the dehumidifier. The dehumidifier is fixedly connected to the second pipe through the cooperation of the mounting plate and the mounting plate. Guide rods are slidably sleeved at both ends of the mounting plate, and a shielding plate is fixedly installed on one side of the two guide rods.

[0007] Preferably, the bottom of the oil receiving cylinder is connected to an oil drain pipe, a valve is fixedly installed inside the oil drain pipe, and a transparent observation window is fixedly installed inside one end of the pipe.

[0008] Preferably, the connecting mechanism includes an annular seat and an unlocking component. Limiting rods are fixedly installed on both sides of the annular seat. The two limiting rods cooperate with two strip-shaped limiting grooves. Rotating shafts are rotatably installed inside the two limiting rods. Card plates are fixedly installed on the outside of the bottom ends of the two rotating shafts. The two card plates cooperate with two card slots. Connecting rods are fixedly installed at the bottom of the two rotating shafts. Transmission grooves are opened at the ends of the two connecting rods away from their respective card plates.

[0009] Preferably, the unlocking component includes an unlocking ring, the unlocking ring having an annular groove inside, an annular strip being provided inside the annular groove, the annular strip being fixedly connected to the inner wall of the annular seat, the unlocking ring being rotatably mounted inside the annular seat through the mutual cooperation of the annular groove and the annular strip, transmission rods being fixedly mounted at both ends of the bottom of the unlocking ring, the two transmission rods being respectively disposed inside two transmission grooves, a worm gear being fixedly mounted at the bottom of the unlocking ring, a worm engaging one side of the worm gear, the worm being rotatably mounted inside the annular seat.

[0010] Preferably, the anti-detachment mechanism includes two positioning blocks, two positioning grooves, and two fixing components. The two positioning blocks are fixedly installed at both ends of the top of the oil receiving cylinder. The two positioning grooves are respectively opened on the top of the two limiting installation rods. The two positioning blocks cooperate with the two positioning grooves. The two fixing components are respectively set on the top of the two limiting installation rods. Fixing holes are opened on the side of the two positioning blocks that are close to each other.

[0011] Preferably, the fixing component includes an extrusion plate and a mounting groove. The extrusion plate is fixedly sleeved on the outside of the top end of the corresponding rotating shaft. The mounting groove is opened on the top of the limiting mounting rod. An anti-detachment rod is slidably installed inside the mounting groove. A spring is sleeved on the outside of the anti-detachment rod. The anti-detachment rod cooperates with the extrusion plate and cooperates with the corresponding fixing hole.

[0012] Preferably, the annular seat has a placement groove in the middle, the bottom of the oil receiving cylinder cooperates with the placement groove, the bottom of the placement groove has a through hole, and the through hole cooperates with the oil drain pipe and the valve.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. By installing an oil receiving cylinder inside pipe 2, gas flows through the gap between the bottom of pipe 1 and the oil receiving cylinder. When the oil level inside the transformer body rises abnormally (such as a sudden rise in oil temperature causing a large expansion of transformer oil, or excessive oil filling in the oil tank), the oil level inside the oil tank rises and enters the oil receiving cylinder through pipe 1. The oil receiving cylinder collects the oil, thereby preventing oil from entering the desiccant, preventing the desiccant inside the desiccant from being soaked in oil and becoming ineffective, and preventing oil from overflowing through the desiccant and contaminating the equipment. This ensures the normal use of the desiccant that is matched with the transformer during manufacturing.

[0014] 2. If it is not necessary to remove the oil receiving tube for cleaning, the valve can be opened directly to drain the oil inside the oil receiving tube. If it is necessary to remove the oil receiving tube for cleaning, rotate the worm gear in the opposite direction and cooperate with the connecting mechanism to release the fixation between the annular seat and the second pipe. Then the annular seat and the oil receiving tube can be removed. At the same time as releasing the annular seat and the second pipe, the fixation between the oil receiving tube and the annular seat is also released, so that the oil receiving tube can be easily removed for cleaning. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the oil pillow structure of the present invention; Figure 3 This is a schematic diagram of the connection structure between the desiccant and the pipe of the present invention; Figure 4 This is a schematic diagram of the internal structure of the second pipe and the oil receiving cylinder of the present invention; Figure 5 This is a schematic diagram of the internal structure of the second pipe of the present invention; Figure 6 This is a schematic diagram of the internal structure of the annular seat, the limiting mounting rod, and the oil receiving cylinder of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point A in the image; Figure 8 This is a schematic diagram of the internal structure of the annular seat, the limiting mounting rod, and the connecting mechanism of the present invention; Figure 9 This is a schematic diagram of the internal structure of the annular seat and the limiting mounting rod of the present invention; Figure 10 This is a schematic diagram of the connection mechanism structure of the present invention; Figure 11 This is a partial structural diagram of the connection mechanism of the present invention; Figure 12 This is a schematic diagram of the oil receiving cylinder structure of the present invention.

[0016] The components represented by each number in the attached diagram are listed below: 1. Transformer body; 2. Oil conservator; 3. Pipe 1; 4. Pipe 2; 5. Dehumidifier; 6. Oil receiving cylinder; 7. Mounting plate 1; 8. Mounting plate 2; 9. Guide rod; 10. Baffle plate; 11. Oil drain pipe; 12. Valve; 13. Transparent observation window; 14. Strip-shaped limiting groove; 15. Slot; 16. Annular seat; 17. Limiting mounting rod; 18. Rotating shaft; 19. Clamping plate; 20. Connecting rod; 21. Transmission groove; 22. Unlocking ring; 23. Transmission rod; 24. Worm gear; 25. Worm; 26. Positioning block; 27. Positioning groove; 28. Fixing hole; 29. ​​Extrusion plate; 30. Mounting groove; 31. Anti-detachment rod; 32. Spring; 33. Annular groove; 34. Annular strip; 35. Placement groove; 36. Through hole. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a technical solution: such as Figure 1 - Figure 12The diagram shows a high-efficiency heat dissipation oil-immersed transformer, including a transformer body 1, an oil conservator 2 fixedly installed at one end of the top of the transformer body 1, and a dehumidifier 5. A first pipe 3 is fixedly installed inside the oil conservator 2. The top of the first pipe 3 is located at the top of the inside of the oil conservator 2, and the bottom end of the first pipe 3 penetrates the oil conservator 2 and extends to the bottom of the oil conservator 2. A second pipe 4 is fixedly sleeved on the outside of the bottom end of the first pipe 3. The dehumidifier 5 is located below the second pipe 4. An oil receiving cylinder 6 is provided inside the second pipe 4. Both ends of the second pipe 4 are provided with strip-shaped limiting grooves 14. The bottom of one side of each of the two strip-shaped limiting grooves 14 is connected to a slot 15. The bottom and top ends of the oil receiving cylinder 6 are respectively provided with a connecting mechanism and an anti-detachment mechanism.

[0019] A mounting plate 7 is fixedly installed at the bottom of the second pipe 4, and a mounting plate 8 is fixedly installed at the top of the dehumidifier 5. The dehumidifier 5 is fixedly connected to the second pipe 4 through the cooperation of the mounting plate 7 and the mounting plate 8. Guide rods 9 are slidably sleeved at both ends of the mounting plate 7, and a shielding plate 10 is fixedly installed on one side of the two guide rods 9.

[0020] The bottom of the oil receiving cylinder 6 is connected to an oil drain pipe 11, and a valve 12 is fixedly installed inside the oil drain pipe 11. A transparent observation window 13 is fixedly installed inside one end of the pipe 4.

[0021] The connecting mechanism includes an annular seat 16 and an unlocking component. Limiting mounting rods 17 are fixedly installed on both sides of the annular seat 16. The two limiting mounting rods 17 cooperate with the two strip-shaped limiting grooves 14 respectively. Rotating shafts 18 are rotatably installed inside the two limiting mounting rods 17. Card plates 19 are fixedly installed on the outside of the bottom end of the two rotating shafts 18 respectively. The two card plates 19 cooperate with the two card slots 15 respectively. Connecting rods 20 are fixedly installed at the bottom of the two rotating shafts 18. Transmission grooves 21 are opened at the ends of the two connecting rods 20 away from their respective card plates 19.

[0022] The unlocking assembly includes an unlocking ring 22, which has an annular groove 33 inside. An annular bar 34 is provided inside the annular groove 33. The annular bar 34 is fixedly connected to the inner wall of the annular seat 16. The unlocking ring 22 is rotatably installed inside the annular seat 16 through the mutual cooperation of the annular groove 33 and the annular bar 34. Both ends of the bottom of the unlocking ring 22 are fixedly installed with transmission rods 23. The two transmission rods 23 are respectively set inside the two transmission grooves 21. A worm gear 24 is fixedly installed at the bottom of the unlocking ring 22. A worm 25 is meshed on one side of the worm gear 24. The worm 25 is rotatably installed inside the annular seat 16.

[0023] The anti-detachment mechanism includes two positioning blocks 26, two positioning grooves 27, and two fixing components. The two positioning blocks 26 are fixedly installed at both ends of the top of the oil receiving cylinder 6. The two positioning grooves 27 are respectively opened on the top of the two limiting installation rods 17. The two positioning blocks 26 cooperate with the two positioning grooves 27 respectively. The two fixing components are respectively set on the top of the two limiting installation rods 17. Fixing holes 28 are opened on the side of the two positioning blocks 26 that are close to each other.

[0024] The fixing assembly includes an extrusion plate 29 and a mounting groove 30. The extrusion plate 29 is fixedly sleeved on the outside of the top of the corresponding rotating shaft 18. The mounting groove 30 is opened on the top of the limiting mounting rod 17. An anti-detachment rod 31 is slidably installed inside the mounting groove 30. A spring 32 is sleeved on the outside of the anti-detachment rod 31. The anti-detachment rod 31 cooperates with the extrusion plate 29 and cooperates with the corresponding fixing hole 28.

[0025] The annular seat 16 has a placement groove 35 in the middle. The bottom of the oil receiving cylinder 6 is matched with the placement groove 35. The bottom of the placement groove 35 has a through hole 36, which is matched with the oil drain pipe 11 and the valve 12.

[0026] Working principle: The transformer body 1 relies on the natural convection of insulating oil for cooling, which also has the advantage of high-efficiency heat dissipation. The heat generated by the core and windings can be quickly transferred to the insulating oil. The heated insulating oil flows upward and is cooled down by the oil tank wall or radiator. Then it sinks back to the core and windings, forming a circulation loop to continuously and efficiently remove heat. Before use, the oil receiving cylinder 6 needs to be installed inside the pipe 2 4. When installing the oil receiving cylinder 6, first place the bottom end of the oil receiving cylinder 6 inside the placement groove 35 in the annular seat 16, so that the oil drain pipe 11 and valve 12 extend to the bottom of the annular seat 16 through the through hole 36. At the same time, place the two positioning blocks 26 at the top two ends of the oil receiving cylinder 6 into the two positioning grooves 27 respectively. Then, place the two limiting installation rods 17 into the two strip limiting grooves 14 respectively. Then push the annular seat 16 and the oil receiving cylinder 6 into the inside of the pipe 2 4. When pushing the annular seat 16, the two limiting installation rods 17 slide in the two strip limiting grooves 14 respectively. Until the annular seat 16 can no longer be pushed, the tops of the two limiting mounting rods 17 contact the inner walls of the two strip-shaped limiting grooves 14, and the two locking plates 19 correspond to the two locking slots 15. Then, the worm gear 25 is rotated. Under the action of the worm gear 25 and the worm wheel 24 meshing with each other, the worm wheel 24 drives the unlocking ring 22 to rotate, which in turn drives the two transmission rods 23 to rotate. The two transmission rods 23 slide inside the two transmission grooves 21, and the two connecting rods 20 move accordingly, thereby driving the two rotating shafts 18 to rotate, which in turn causes the two locking plates 19 to rotate. The two locking plates 19 enter the two locking slots 15, thus completing the annular seat 16. 6 is fixed to the pipe 2 4; while the two rotating shafts 18 rotate, the two pressing plates 29 at the top of them rotate synchronously. During the process of the two pressing plates 29 rotating to the maximum angle, they press the two anti-detachment rods 31 respectively. The two anti-detachment rods 31 move closer to each other synchronously. The two springs 32 are pressed by force. One end of the two anti-detachment rods 31 extends into the two fixing holes 28 respectively, thereby completing the fixation between the oil receiving cylinder 6 and the two limiting installation rods 17, so as to prevent the oil receiving cylinder 6 from being moved up and down by vibration during the operation and affecting the oil receiving effect. Finally, the mounting plate 2 8 at the top of the dehumidifier 5 is fixed to the bottom of the mounting plate 1 7 with bolts. After the oil receiving cylinder 6 is fixed, the bottom end of pipe 3 is located inside the oil receiving cylinder 6. Gas flows through the gap between the bottom of pipe 3 and the oil receiving cylinder 6. When the oil level inside the transformer body 1 rises abnormally (such as a sudden increase in oil temperature causing a large expansion of transformer oil, or excessive oil filling in the oil conservator 2), the oil level inside the oil conservator 2 rises and enters the oil receiving cylinder 6 through pipe 3. The oil receiving cylinder 6 collects the oil, thus preventing oil from entering the desiccant 5, preventing the desiccant inside the desiccant 5 from being soaked in oil and becoming ineffective, and preventing oil from overflowing through the desiccant 5 and contaminating the equipment. This ensures the normal use of the desiccant 5 that is matched with the transformer during manufacturing. The oil receiving cylinder 6 is made of transparent material, and the staff can observe whether oil has entered the oil receiving cylinder 6 through the transparent observation window 13. If oil has entered, it indicates that the oil level inside the oil conservator 2 is abnormal or the internal pressure is high. If the transformer body 1 is unbalanced, the staff needs to inspect it. After troubleshooting, if the oil receiving cylinder 6 does not need to be removed for cleaning, the valve 12 can be opened directly to drain the oil inside the oil receiving cylinder 6. If the oil receiving cylinder 6 needs to be removed for cleaning, the worm gear 25 is rotated in the opposite direction, causing the two rotating shafts 18 to rotate in the opposite direction. The two clamping plates 19 are then retracted into the two limiting mounting rods 17. At the same time, the two pressing plates 29 no longer press the two anti-detachment rods 31. Under the action of the two springs 32, the two anti-detachment rods 31 are disengaged from the two fixing holes 28. After removing the annular seat 16, the oil receiving cylinder 6 can be removed directly for cleaning. After removing the annular seat 16, the shielding plate 10 is slid along the two guide rods 9 to shield the bottom of the second pipe 4, preventing outside air from entering the interior of the first pipe 3 and the second pipe 4.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 process, method, article, or apparatus.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency heat dissipation oil-immersed transformer, comprising a transformer body (1), an oil conservator (2) fixedly installed at one end of the top of the transformer body (1), and a dehumidifier (5), characterized in that: The oil reservoir (2) is fixedly installed with a pipe (3). The top of the pipe (3) is located at the top of the oil reservoir (2). The bottom of the pipe (3) penetrates the oil reservoir (2) and extends to the bottom of the oil reservoir (2). The bottom of the pipe (3) is fixedly fitted with a pipe (4). The dehumidifier (5) is located below the pipe (4). The pipe (4) is equipped with an oil receiving cylinder (6). Both ends of the pipe (4) are provided with strip-shaped limiting grooves (14). The bottom of one side of each of the two strip-shaped limiting grooves (14) is connected to a slot (15). The bottom and top of the oil receiving cylinder (6) are respectively provided with a connecting mechanism and an anti-detachment mechanism.

2. The oil-immersed transformer with high-efficiency heat dissipation according to claim 1, characterized in that: The bottom of the second pipe (4) is fixedly installed with a mounting plate (7), and the top of the dehumidifier (5) is fixedly installed with a mounting plate (8). The dehumidifier (5) is fixedly connected to the second pipe (4) through the cooperation of the mounting plate (7) and the mounting plate (8). Both ends of the mounting plate (7) are slidably fitted with guide rods (9), and a shielding plate (10) is fixedly installed on one side of the two guide rods (9).

3. The oil-immersed transformer with high-efficiency heat dissipation according to claim 1, characterized in that: The bottom of the oil receiving cylinder (6) is connected to an oil drain pipe (11), and a valve (12) is fixedly installed inside the oil drain pipe (11). A transparent observation window (13) is fixedly installed inside one end of the second pipe (4).

4. The oil-immersed transformer with high-efficiency heat dissipation according to claim 3, characterized in that: The connecting mechanism includes an annular seat (16) and an unlocking component. Limiting rods (17) are fixedly installed on both sides of the annular seat (16). The two limiting rods (17) cooperate with two strip-shaped limiting grooves (14) respectively. Rotating shafts (18) are rotatably installed inside the two limiting rods (17). Card plates (19) are fixedly installed on the outside of the bottom end of the two rotating shafts (18). The two card plates (19) cooperate with two card slots (15) respectively. Connecting rods (20) are fixedly installed at the bottom of the two rotating shafts (18). Transmission grooves (21) are opened at the ends of the two connecting rods (20) away from their respective card plates (19).

5. The oil-immersed transformer with high-efficiency heat dissipation according to claim 4, characterized in that: The unlocking assembly includes an unlocking ring (22), an annular groove (33) is provided inside the unlocking ring (22), an annular strip (34) is provided inside the annular groove (33), the annular strip (34) is fixedly connected to the inner wall of the annular seat (16), the unlocking ring (22) is rotatably installed inside the annular seat (16) through the mutual cooperation of the annular groove (33) and the annular strip (34), both ends of the bottom of the unlocking ring (22) are fixedly installed with transmission rods (23), the two transmission rods (23) are respectively set inside the two transmission grooves (21), the bottom of the unlocking ring (22) is fixedly installed with a worm gear (24), one side of the worm gear (24) is meshed with a worm (25), the worm (25) is rotatably installed inside the annular seat (16).

6. The oil-immersed transformer with high-efficiency heat dissipation according to claim 4, characterized in that: The anti-detachment mechanism includes two positioning blocks (26), two positioning grooves (27), and two fixing components. The two positioning blocks (26) are fixedly installed at both ends of the top of the oil receiving cylinder (6). The two positioning grooves (27) are respectively opened on the top of the two limiting installation rods (17). The two positioning blocks (26) cooperate with the two positioning grooves (27). The two fixing components are respectively set on the top of the two limiting installation rods (17). Fixing holes (28) are opened on the side of the two positioning blocks (26) that are close to each other.

7. The oil-immersed transformer with high-efficiency heat dissipation according to claim 6, characterized in that: The fixing assembly includes an extrusion plate (29) and a mounting groove (30). The extrusion plate (29) is fixedly sleeved on the outside of the top of the corresponding rotating shaft (18). The mounting groove (30) is opened on the top of the limiting mounting rod (17). An anti-detachment rod (31) is slidably installed inside the mounting groove (30). A spring (32) is sleeved on the outside of the anti-detachment rod (31). The anti-detachment rod (31) cooperates with the extrusion plate (29) and cooperates with the corresponding fixing hole (28).

8. The oil-immersed transformer with high-efficiency heat dissipation according to claim 4, characterized in that: The annular seat (16) has a placement groove (35) in the middle. The bottom of the oil receiving cylinder (6) is in cooperation with the placement groove (35). The bottom of the placement groove (35) has a through hole (36). The through hole (36) is in cooperation with the oil drain pipe (11) and the valve (12).

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