Sampling device for detecting insulating oil of oil-immersed transformer

Abstract

The invention provides a sampling device for detecting insulating oil of an oil-immersed transformer, which comprises a sampling barrel internally provided with a sampling cavity and a mounting cavity at an interval from top to bottom, the sampling cavity is arranged in a vacuum manner, an oil inlet pipe is arranged in the sampling barrel, the top end of the oil inlet pipe is connected with an oil outlet pipe of the transformer, and an oil inlet hole communicated with the sampling cavity is formed in the oil inlet pipe; a baffle is slidably arranged in the oil inlet pipe and blocks the oil inlet hole, a first piston is slidably arranged at the top of the oil inlet pipe, and a driving mechanism is arranged in the mounting cavity and used for driving the first piston to slide downwards and driving the baffle to slide downwards. The sampling cavity is arranged in a vacuum mode, so that insulating oil entering the sampling cavity cannot make contact with air, the insulating oil is prevented from being oxidized by the air, in addition, the oil inlet pipe and the first piston are arranged, the first piston is arranged at the top of the oil inlet pipe, when the first piston moves downwards, the insulating oil can enter the oil inlet pipe, and the insulating oil is prevented from being oxidized by the air. The insulating oil in the oil inlet pipe is not in contact with external air, so that the insulating oil is prevented from being oxidized.

Description

Technical Field

[0001] The invention belongs to the technical field of sampling devices, and more specifically, relates to a sampling device for detecting insulating oil of an oil-immersed transformer. Background Art

[0002] Oil-immersed transformers are transformers that rely on oil as a cooling medium, usually consisting of a body and an oil tank. They are suitable for outdoor and relatively harsh environments, such as poles and outdoors, because oil-immersed transformers have strong heat dissipation performance and low manufacturing and maintenance costs.

[0003] Insulating oil chromatography is a commonly used fault diagnosis technology for electrical equipment, especially in the maintenance of oil-filled electrical equipment such as transformers. By analyzing the gas components dissolved in the insulating oil, potential overheating, discharge and other faults inside the equipment can be monitored, so that preventive measures can be taken in advance to ensure the safe operation of the power grid.

[0004] However, when conducting chromatographic experiments on insulating oil, it is necessary to sample the insulating oil of the transformer on site and then send it to the laboratory for testing. However, it must be said that in actual operation, it is impossible to go back and forth to the laboratory for each sampling of a transformer. It is often necessary to sample multiple transformers and then send them to the laboratory. The insulating oil sampled first needs to be stored for a short period of time, which may cause the insulating oil sampled first to be oxidized by air, resulting in the detection results of the chromatographic experiment being inaccurate. Summary of the invention

[0005] The purpose of the present invention is to provide a sampling device for detecting insulating oil of an oil-immersed transformer, so as to prevent the insulating oil from being oxidized by air and improve the detection accuracy of a chromatographic test.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a sampling device for detecting insulating oil of an oil-immersed transformer, comprising a sampling cylinder with a sampling cavity and an installation cavity spaced apart from each other in the upper and lower parts, the sampling cavity being vacuum-arranged, an oil inlet pipe being arranged in the sampling cylinder, the top end of the oil inlet pipe being arranged outside the sampling cylinder, the bottom of the oil inlet pipe extending into the installation cavity, the top end of the oil inlet pipe being connected to the oil outlet pipe of the transformer, an oil inlet hole communicating with the sampling cavity being arranged on the oil inlet pipe, a baffle being slidingly arranged in the oil inlet pipe, the baffle blocking the oil inlet hole, a first piston being slidingly arranged on the top of the oil inlet pipe, a driving mechanism being arranged in the installation cavity, the driving mechanism being connected to the first piston, the driving mechanism being used to drive the first piston to slide down, and drive the baffle to slide down, so that the oil inlet pipe above the first piston is communicated with the sampling cavity through the oil inlet hole.

[0007] In one possible implementation, a partition plate is slidably provided inside the sampling cylinder, the partition plate is annular, the outer wall of the partition plate is sealed with the inner wall of the sampling cylinder, and the inner wall of the partition plate is sealed with the outer wall of the oil inlet pipe; the inner cavity of the sampling cylinder arranged above the partition plate is the sampling cavity, and the inner cavity of the sampling cylinder arranged below the partition plate is the installation cavity, in an initial state, the top surface of the partition plate abuts against the inner top surface of the sampling cylinder, and the partition plate blocks the oil inlet hole, and the partition plate is connected to the first piston, so that the first piston and the partition plate move synchronously.

[0008] In a possible implementation, a fixed plate is provided in the oil inlet pipe, and the fixed plate is provided below the oil inlet hole. A first guide groove is provided on the side wall of the oil inlet pipe, and a first guide block is provided on the side wall of the baffle plate. The first guide block is inserted into the first guide groove. A first spring is provided between the baffle plate and the fixed plate. When the first spring is in a natural state, the baffle plate blocks the oil inlet hole.

[0009] In a possible implementation, a second piston is slidably provided in the oil inlet pipe, the second piston is arranged below the fixed plate, pure water is filled between the first piston and the second piston, and a driving mechanism is connected to the second piston; the second piston is connected to the partition plate by a connecting rod, the connecting rod is U-shaped, one end of the connecting rod is connected to the second piston, and the other end of the connecting rod is connected to the partition plate, a first baffle ring is provided at the bottom end of the oil inlet pipe, the outer wall of the first baffle ring is fixedly connected to the inner wall of the oil inlet pipe, and the connecting rod is arranged through the inner hole of the first baffle ring.

[0010] In a possible implementation, the driving mechanism includes a driving cable, a winding shaft, a first bevel gear, a second bevel gear, two mounting plates and a driving shaft, the driving shaft is arranged on the bottom of the sampling barrel, the first bevel gear is arranged at the top of the driving shaft, the two mounting plates are arranged at intervals, and the two mounting plates are arranged on both sides of the driving shaft, the winding shaft is rotatably arranged between the two mounting plates, the second bevel gear is arranged on the winding shaft, and the first bevel gear is meshed with the second bevel gear; one end of the driving cable is fixed on the winding shaft, and the other end of the driving cable is arranged at the bottom of the second piston; the bottom of the sampling barrel is rotatably arranged, and the driving shaft, the first bevel gear, the oil inlet pipe and the sampling barrel are coaxially arranged.

[0011] In a possible implementation, a mounting groove is provided on the top surface of the bottom of the sampling barrel, and a mounting ring is rotatably provided in the mounting groove. A second spring is provided on the top of the mounting ring, and the top of the second spring is connected to the partition plate. When the second spring is in a natural state, the top of the partition plate abuts against the inner top of the sampling barrel; a driving ring is provided on the outer wall of the sampling barrel, and the driving ring is connected to the bottom of the sampling barrel. The driving ring is used to drive the bottom of the sampling barrel to rotate.

[0012] In a possible implementation, the inner wall of the bottom of the sampling barrel abuts against the outer wall of the sampling barrel, a connecting groove is provided on the side wall of the sampling barrel, the connecting groove is annular, a connecting ring is provided on the inner wall of the bottom of the sampling barrel, the connecting ring is inserted in the connecting groove, a plurality of air holes are evenly arranged on the bottom of the sampling barrel, a threaded section is provided on the outer wall of the sampling barrel, a first thread is provided on the threaded section, the driving ring is screwed on the threaded section, a telescopic rod is provided at the bottom of the driving ring, a telescopic tube is provided on the bottom of the sampling barrel, and the telescopic rod is inserted in the telescopic tube.

[0013] In a possible implementation, a connecting pipe is provided at the top of the oil inlet pipe, the inner diameter of the connecting pipe is the same as the outer diameter of the oil inlet pipe, the connecting pipe is sleeved on the top of the oil inlet pipe, and the top of the connecting pipe is connected to the oil outlet pipe of the transformer. In an initial state, the top of the first piston is flush with the top of the oil inlet pipe, an exhaust pipe is provided on the connecting pipe, the exhaust pipe extends outward in the radial direction of the connecting pipe, the bottom of the exhaust pipe is flush with the top of the oil inlet pipe, and a sealing assembly is provided at the top of the exhaust pipe, and the sealing assembly is used to seal the exhaust pipe.

[0014] In one possible implementation, the top end of the exhaust pipe is sealed, an outlet pipe is provided on the exhaust pipe, a second baffle ring is provided in the outlet pipe, a sealing ball is provided in the exhaust pipe, the density of the sealing ball is greater than that of air, and the sealing of the sealing ball is less than that of insulating oil, the inner diameter of the second baffle ring is smaller than the diameter of the sealing ball, the sealing ball is arranged below the outlet pipe, a guide assembly is provided in the exhaust pipe, the sealing ball is connected to the guide assembly, and the guide assembly is used to guide the sealing ball to slide in a vertical direction.

[0015] In a possible implementation, the guide assembly includes a guide pipe and a diverter plate, the diverter plate is horizontally arranged in the exhaust pipe, the guide pipe is arranged at the bottom of the outlet pipe, a plurality of through holes are evenly arranged on the guide pipe, the sealing ball is arranged in the guide pipe, one end of the diverter plate away from the connecting pipe and one side of the guide pipe away from the connecting pipe, the diverter plate is provided with an inlet hole, and the inlet hole is arranged at the bottom of the guide pipe.

[0016] The beneficial effects of the sampling device for detecting insulating oil in an oil-immersed transformer provided by the present invention are as follows: compared with the prior art, the present invention arranges the sampling chamber in a vacuum manner so that the insulating oil entering the sampling chamber does not come into contact with the air, thereby preventing the insulating oil from being oxidized by the air; in addition, by arranging an oil inlet pipe and a first piston, and the first piston is arranged at the top of the oil inlet pipe, when the first piston moves downward, the insulating oil will enter the oil inlet pipe, and the insulating oil in the oil inlet pipe will not come into contact with the external air; by arranging an oil inlet hole and a baffle plate, when the first piston moves downward, the baffle plate can be driven to move downward, at which time the blockage of the oil inlet hole is released, and the sampling chamber and the oil inlet pipe above the first piston are connected through the oil inlet hole. In summary, during the entire sampling process, the insulating oil does not come into contact with the air, thereby preventing the insulating oil from being oxidized by the air during the sampling process, and after the sampling is completed, only the top of the oil inlet pipe needs to be blocked, and the insulating oil will not leak out. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structure of a sampling device for detecting insulating oil in an oil-immersed transformer provided in an embodiment of the present invention; Figure 2 A cross-sectional view of an initial state of a sampling device for detecting insulating oil in an oil-immersed transformer provided by an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of part A; Figure 4 for Figure 3 A magnified view of part B; Figure 5 for Figure 2 Enlarged view of part C; Figure 6 A cross-sectional view of a sampling device for detecting insulating oil in an oil-immersed transformer provided by an embodiment of the present invention during sampling; Figure 7 for Figure 6 A magnified view of the D portion; Figure 8 A schematic structural diagram of the bottom end of the oil inlet pipe provided in an embodiment of the present invention; Fig. 9 A schematic diagram of the exhaust structure of the exhaust pipe provided by an embodiment of the present invention; Fig.10A schematic diagram of the structure of the exhaust pipe provided in an embodiment of the present invention when exhaust is completed.

[0019] Among them, the reference numerals in the figures are as follows: 1. Sampling tube; 2. Oil inlet pipe; 3. Separator; 4. Driving rope; 5. Connecting pipe; 101, sampling cavity; 102, mounting cavity; 103, cylinder bottom; 104, mounting ring; 105, second spring; 106, driving ring; 107, threaded section; 108, telescopic rod; 109, telescopic tube; 110, connecting ring; 201, oil inlet hole; 202, baffle; 203, first piston; 204, fixing plate; 205, first guide groove; 206, first spring; 207, second piston; 208, connecting rod; 209, first baffle ring; 401, winding shaft; 402, first bevel gear; 403, second bevel gear; 404, mounting plate; 405, driving shaft; 501, exhaust pipe; 502, outlet pipe; 503, second baffle ring; 504, blocking ball; 505, diverter plate; 506, guide pipe; 507, through hole. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] It should be further explained that the drawings and implementation modes of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0022] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0023] The directions or positional relationships indicated by terms such as “length”, “width”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0025] The sampling device for detecting insulating oil of an oil-immersed transformer provided by the present invention is now described.

[0026] Please also read Figure 1 and Figure 2 The sampling device for detecting insulating oil of an oil-immersed transformer comprises a sampling cylinder 1 with a sampling cavity 101 and an installation cavity 102 spaced apart from each other in the upper and lower parts. The sampling cavity 101 is arranged in a vacuum manner. An oil inlet pipe 2 is arranged in the sampling cylinder 1. The top of the oil inlet pipe 2 is arranged outside the sampling cylinder 1. The bottom of the oil inlet pipe 2 extends into the installation cavity 102. The top of the oil inlet pipe 2 is connected to the oil outlet pipe of the transformer. An oil inlet hole 201 communicating with the sampling cavity 101 is arranged on the oil inlet pipe 2. A baffle 202 is slidably arranged in the oil inlet pipe 2. The baffle 202 blocks the oil inlet hole 201. A first piston 203 is slidably arranged on the top of the oil inlet pipe 2. A driving mechanism is arranged in the installation cavity 102. The driving mechanism is connected to the first piston 203. The driving mechanism is used to drive the first piston 203 to slide down and drive the baffle 202 to slide down, so that the oil inlet pipe 2 above the first piston 203 is communicated with the sampling cavity 101 through the oil inlet hole 201.

[0027] The beneficial effects of the sampling device for detecting insulating oil in an oil-immersed transformer provided in the present embodiment are as follows: compared with the prior art, the sampling device for detecting insulating oil in an oil-immersed transformer provided in the present embodiment arranges the sampling chamber 101 to be vacuum-arranged so that the insulating oil entering the sampling chamber 101 will not come into contact with the air, thereby preventing the insulating oil from being oxidized by the air; in addition, by providing the oil inlet pipe 2 and the first piston 203, and the first piston 203 is provided at the top of the oil inlet pipe 2, when the first piston 203 moves downward, the insulating oil will enter the oil inlet pipe 2, and the oil inlet pipe 2 will be oxidized by the air. 2 will not come into contact with the outside air; by setting the oil inlet hole 201 and the baffle 202, when the first piston 203 moves downward, it can drive the baffle 202 to move downward, at this time, the blockage of the oil inlet hole 201 is released, and the sampling cavity 101 and the oil inlet pipe 2 above the first piston 203 are connected through the oil inlet hole 201. In summary, during the entire sampling process, the insulating oil does not come into contact with the air, which prevents the insulating oil from being oxidized by the air during the sampling process, and after the sampling is completed, it only needs to block the top of the oil inlet pipe 2, and the insulating oil will not leak out.

[0028] Combination Figure 2 , Figure 6 and Figure 7 As shown, a partition plate 3 is slidably provided inside the sampling cylinder 1. The partition plate 3 is annular, and the outer wall of the partition plate 3 is sealed with the inner wall of the sampling cylinder 1, and the inner wall of the partition plate 3 is sealed with the outer wall of the oil inlet pipe 2. The inner cavity of the sampling cylinder 1 arranged above the partition plate 3 is the sampling cavity 101, and the inner cavity of the sampling cylinder 1 arranged below the partition plate 3 is the installation cavity 102. In the initial state, the top surface of the partition plate 3 abuts against the inner top surface of the sampling cylinder 1, and the partition plate 3 blocks the oil inlet hole 201. The partition plate 3 is connected to the first piston 203, so that the first piston 203 and the partition plate 3 move synchronously.

[0029] In the initial state, the top of the partition plate 3 abuts against the internal fixed ratio of the sampling tube 1, so that when the partition plate 3 descends to form the sampling chamber 101, the sampling chamber 101 is in a vacuum state, and the partition plate 3 and the first piston 203 move synchronously, so that when the first piston 203 moves downward, the sampling chamber 101 is formed, until the first piston 203 drives the baffle 202 to move downward to release the blockage of the oil inlet hole 201, the insulating oil enters the sampling chamber 101, and the sampling chamber 101 is vacuum in a negative pressure state, which is also convenient for the absorption of the insulating oil.

[0030] like Figure 2 , Figure 3 and Figure 4As shown, a fixed plate 204 is provided in the oil inlet pipe 2, and the fixed plate 204 is provided below the oil inlet hole 201. A first guide groove 205 is provided on the side wall of the oil inlet pipe 2, and a first guide block is provided on the side wall of the baffle plate, and the first guide block is inserted into the first guide groove 205. A first spring 206 is provided between the baffle plate and the fixed plate 204. When the first spring 206 is in a natural state, the baffle plate blocks the oil inlet hole 201.

[0031] The first spring 206 is provided so that the baffle 202 can be reset when the driving mechanism loses its driving force, and the cooperation between the first guide groove 205 and the first guide block ensures that the baffle 202 will not release the blockage of the oil inlet hole 201 due to rotation.

[0032] like Figure 2 and Figure 6 As shown, a second piston 207 is slidably provided in the oil inlet pipe 2, and the second piston 207 is arranged below the fixed plate 204. Pure water is filled between the first piston 203 and the second piston 207, and the driving mechanism is connected to the second piston 207; the second piston 207 is connected to the partition plate 3 through a connecting rod 208, and the connecting rod 208 is U-shaped, one end of the connecting rod 208 is connected to the second piston 207, and the other end of the connecting rod 208 is connected to the partition plate 3. A first baffle ring 209 is provided at the bottom end of the oil inlet pipe 2, and the outer wall of the first baffle ring 209 is fixedly connected to the inner wall of the oil inlet pipe 2, and the connecting rod 208 is arranged through the inner hole of the first baffle ring 209.

[0033] The second piston 207 is provided to facilitate the provision of a sealed cavity between the first piston 203 and the second piston 207. By filling the sealed cavity with pure water, when the second piston 207 moves, the first piston 203 can also be driven to move. Figure 8 As shown, by providing the first retaining ring 209 , the second piston 207 will not be separated from the oil inlet pipe 2 .

[0034] In this embodiment, the driving mechanism includes a driving cable 4, a reel 401, a first bevel gear 402, a second bevel gear 403, two mounting plates 404 and a driving shaft 405. The driving shaft 405 is arranged on the bottom 103 of the sampling barrel 1, the first bevel gear 402 is arranged on the top of the driving shaft 405, the two mounting plates 404 are arranged at intervals, and the two mounting plates 404 are arranged on both sides of the driving shaft 405, the reel 401 is rotatably arranged between the two mounting plates 404, the second bevel gear 403 is arranged on the reel 401, and the first bevel gear 402 is meshed with the second bevel gear 403. One end of the driving cable 4 is fixed on the reel 401, and the other end of the driving cable 4 is arranged at the bottom of the second piston 207. The bottom 103 of the sampling barrel is rotatably arranged, and the driving shaft 405, the first bevel gear 402, the oil inlet pipe 2 and the sampling barrel 1 are coaxially arranged.

[0035] In actual use, by rotating the drive ring 106 and the bottom 103 of the cylinder, the drive shaft 405 will be driven to rotate. When the drive shaft 405 rotates, it will drive the winding shaft 401 to rotate. The winding shaft 401 will wind the drive rope 4 onto the winding shaft 401, which will pull the second piston 207 downward, and then drive the first piston 203 and the partition plate 3 to move downward synchronously.

[0036] like Figure 5 As shown, a mounting groove is provided on the top surface of the bottom 103 of the sampling barrel 1, a mounting ring 104 is rotatably provided in the mounting groove, a second spring 105 is provided on the top of the mounting ring 104, the top of the second spring 105 is connected to the partition plate 3, and when the second spring 105 is in a natural state, the top of the partition plate 3 is connected to the inner top of the sampling barrel 1. A driving ring 106 is provided on the outer wall of the sampling barrel 1, and the driving ring 106 is connected to the bottom 103 of the sampling barrel 1. The driving ring 106 is used to drive the bottom 103 of the sampling barrel 1 to rotate.

[0037] The second spring 105 is arranged so that when the driving ring 106 is rotated forward, the partition plate 3 will be driven to move downward. At this time, the second spring 105 will compress the stored energy. When the driving ring 106 is rotated in the reverse direction, the winding shaft 401 will unwind the driving rope 4. At this time, the second spring 105 releases energy and pushes the partition plate 3 to stop moving upward. At this time, the insulating oil in the sampling chamber 101 can be discharged.

[0038] As a preferred technical solution, the inner wall of the bottom 103 of the sampling barrel 1 abuts against the outer wall of the sampling barrel 1, and a connecting groove is provided on the side wall of the sampling barrel 1, and the connecting groove is annular. A connecting ring 110 is provided on the inner wall of the bottom 103 of the sampling barrel 1, and the connecting ring 110 is inserted in the connecting groove. A plurality of air holes are evenly arranged on the bottom 103 of the sampling barrel 1, and a threaded section 107 is provided on the outer wall of the sampling barrel 1, and a first thread is provided on the threaded section 107. A driving ring 106 is screwed on the threaded section 107, and a telescopic rod 108 is provided at the bottom of the driving ring 106. A telescopic tube 109 is provided on the bottom 103 of the sampling barrel 1, and the telescopic rod 108 is inserted in the telescopic tube 109.

[0039] The setting of the threaded section 107 prevents the drive ring 106 from rotating when the external force is lost, thereby preventing the accidental inhalation of air or the accidental discharge of insulating oil. In addition, by setting the telescopic tube 109 and the telescopic rod 108, the bottom 103 of the cylinder can also be driven to rotate when the drive ring 106 moves up and down.

[0040] like Figure 1As shown, a connecting pipe 5 is provided at the top of the oil inlet pipe 2, the inner diameter of the connecting pipe 5 is the same as the outer diameter of the oil inlet pipe 2, the connecting pipe 5 is sleeved on the top of the oil inlet pipe 2, and the top of the connecting pipe 5 is connected to the oil outlet pipe of the transformer. In the initial state, the top of the first piston 203 is flush with the top of the oil inlet pipe 2, and an exhaust pipe 501 is provided on the connecting pipe 5. The exhaust pipe 501 extends outwardly along the radial direction of the connecting pipe 5, and the bottom of the exhaust pipe 501 is flush with the top of the oil inlet pipe 2. A plugging component is provided at the top of the exhaust pipe 501, and the plugging component is used to plug the exhaust pipe 501.

[0041] In actual use, the exhaust pipe 501 is opened first. Since the first piston 203 does not move, the insulating oil in the transformer will enter the connecting pipe 5 through the oil outlet pipe of the transformer and then flow to the exhaust pipe 501. The insulating oil can push the air in the oil outlet pipe to be discharged. At this time, the exhaust pipe 501 can be closed to sample the insulating oil.

[0042] like Fig. 9 and Fig.10 As shown, the top sealing arrangement of the exhaust pipe 501, the exhaust pipe 501 is provided with an outlet pipe 502, the outlet pipe 502 is provided with a second retaining ring 503, the exhaust pipe 501 is provided with a blocking ball 504, the density of the blocking ball 504 is greater than that of air, and the sealing of the blocking ball 504 is smaller than that of the insulating oil, the inner diameter of the second retaining ring 503 is smaller than the diameter of the blocking ball 504, the blocking ball 504 is arranged below the outlet pipe 502, the exhaust pipe 501 is provided with a guide assembly, the blocking ball 504 is connected to the guide assembly, and the guide assembly is used to guide the blocking ball 504 to slide in the vertical direction. When exhausting, the blocking ball 504 is below the exhaust pipe 501, when the air is exhausted, the exhaust pipe 501 is filled with insulating oil, at this time the blocking ball 504 will float up until it is blocked by the second retaining ring 503, at this time the blocking ball 504 completes the blocking of the outlet pipe 502.

[0043] Finally, the guide assembly includes a guide tube 506 and a diverter plate 505. The diverter plate 505 is horizontally arranged in the exhaust pipe 501. The guide tube 506 is arranged at the bottom of the outlet pipe 502. A plurality of through holes 507 are evenly arranged on the guide tube 506. The blocking ball 504 is arranged in the guide tube 506. One end of the diverter plate 505 away from the connecting pipe 5 and one side of the guide tube 506 away from the connecting pipe 5 are connected. The diverter plate 505 is provided with an inlet hole, and the inlet hole is arranged at the bottom of the guide tube 506. The arrangement of the diverter plate 505 and the guide tube 506 can guide the movement of the blocking ball 504, so that the blocking ball 504 can block the outlet pipe 502.

[0044] It is worth noting that when sampling is completed, there is also insulating oil in the oil inlet pipe 2. In order to prevent the insulating oil at the top of the oil inlet pipe 2 from being oxidized by air, the top of the oil inlet pipe 2 can be blocked. In actual testing, a portion of the insulating oil is first discharged to push out the insulating oil in the oil inlet pipe 2. The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sampling device for detecting insulating oil in an oil-immersed transformer, characterized in that: The invention comprises a sampling cylinder (1) having a sampling cavity (101) and a mounting cavity (102) arranged therein, the sampling cavity (101) being arranged in a vacuum, an oil inlet pipe (2) being arranged therein, the top end of the oil inlet pipe (2) being arranged outside the sampling cylinder (1), the bottom end of the oil inlet pipe (2) extending into the mounting cavity (102), the oil inlet pipe (2) being used for connecting to an oil outlet pipe of a transformer, an oil inlet hole (201) being arranged on the oil inlet pipe (2), and a baffle (202) being slidably arranged inside the oil inlet pipe (2). The baffle (202) blocks the oil inlet hole (201); a first piston (203) is slidably provided on the top of the oil inlet pipe (2); a driving mechanism is provided in the installation cavity (102); the driving mechanism is connected to the first piston (203); the driving mechanism is used to drive the first piston (203) to slide down and drive the baffle (202) to slide down, so that the oil inlet pipe (2) above the first piston (203) is connected to the sampling cavity (101) through the oil inlet hole (201).

2. The sampling device for detecting insulating oil of an oil-immersed transformer according to claim 1, characterized in that: A partition plate (3) is slidably provided inside the sampling cylinder (1); the partition plate (3) is annular; the outer wall of the partition plate (3) is sealed with the inner wall of the sampling cylinder (1); and the inner wall of the partition plate (3) is sealed with the outer wall of the oil inlet pipe (2); the inner cavity of the sampling cylinder (1) arranged above the partition plate (3) is the sampling cavity (101); the inner cavity of the sampling cylinder (1) arranged below the partition plate (3) is the installation cavity (102); in an initial state, the top surface of the partition plate (3) abuts against the inner top surface of the sampling cylinder (1), and the partition plate (3) blocks the oil inlet hole (201); the partition plate (3) is connected to the first piston (203), so that the first piston (203) and the partition plate (3) move synchronously.

3. The sampling device for detecting insulating oil of an oil-immersed transformer according to claim 2, characterized in that: A fixing plate (204) is provided in the oil inlet pipe (2), the fixing plate (204) being arranged below the oil inlet hole (201), a first guide groove (205) being provided on the side wall of the oil inlet pipe (2), a first guide block being provided on the side wall of the baffle plate, the first guide block being inserted into the first guide groove (205), a first spring (206) being provided between the baffle plate and the fixing plate (204), and when the first spring (206) is in a natural state, the baffle plate blocks the oil inlet hole (201).

4. The sampling device for detecting insulating oil of an oil-immersed transformer according to claim 3, characterized in that: A second piston (207) is slidably disposed in the oil inlet pipe (2). The second piston (207) is disposed below the fixed plate (204). Pure water is filled between the first piston (203) and the second piston (207). A driving mechanism is connected to the second piston (207). The second piston (207) is connected to the partition plate (3) via a connecting rod (208). The connecting rod (208) is U-shaped. One end of the connecting rod (208) is connected to the second piston (207), and the other end of the connecting rod (208) is connected to the partition plate (3). A first retaining ring (209) is disposed at the bottom end of the oil inlet pipe (2). The outer wall of the first retaining ring (209) is fixedly connected to the inner wall of the oil inlet pipe (2). The connecting rod (208) is arranged through the inner hole of the first retaining ring (209).

5. The sampling device for detecting insulating oil of an oil-immersed transformer according to claim 4, characterized in that: The driving mechanism comprises a driving cable (4), a reel (401), a first bevel gear (402), a second bevel gear (403), two mounting plates (404) and a driving shaft (405); the driving shaft (405) is arranged on the bottom (103) of the sampling tube (1); the first bevel gear (402) is arranged on the top of the driving shaft (405); the two mounting plates (404) are arranged at intervals, and the two mounting plates (404) are arranged on both sides of the driving shaft (405); the reel (401) is rotatably arranged on the reel. Between the two mounting plates (404), the second bevel gear (403) is arranged on the reel (401), and the first bevel gear (402) is meshed with the second bevel gear (403); one end of the drive cable (4) is fixed on the reel (401), and the other end of the drive cable (4) is arranged at the bottom of the second piston (207); the bottom (103) of the sampling cylinder is rotatably arranged, and the drive shaft (405), the first bevel gear (402), the oil inlet pipe (2) and the sampling cylinder (1) are coaxially arranged.

6. The sampling device for detecting insulating oil in an oil-immersed transformer according to claim 5, characterized in that: A mounting groove is provided on the top surface of the bottom (103) of the sampling barrel (1), and a mounting ring (104) is rotatably provided in the mounting groove; a second spring (105) is provided on the top of the mounting ring (104), and the top of the second spring (105) is connected to the partition plate (3); when the second spring (105) is in a natural state, the top of the partition plate (3) abuts against the inner top of the sampling barrel (1); a driving ring (106) is provided on the outer wall of the sampling barrel (1), and the driving ring (106) is connected to the bottom (103) of the sampling barrel (1); the driving ring (106) is used to drive the bottom (103) of the sampling barrel (1) to rotate.

7. The sampling device for detecting insulating oil of an oil-immersed transformer according to claim 6, characterized in that: The inner wall of the bottom (103) of the sampling barrel (1) is in contact with the outer wall of the sampling barrel (1); a connecting groove is provided on the side wall of the sampling barrel (1); the connecting groove is annular; a connecting ring (110) is provided on the inner wall of the bottom (103) of the sampling barrel (1); the connecting ring (110) is inserted into the connecting groove; a plurality of air holes are evenly arranged on the bottom (103) of the sampling barrel (1); a threaded section (107) is provided on the outer wall of the sampling barrel (1); the threaded section (107) is provided with a first thread; the driving ring (106) is screwed onto the threaded section (107); a telescopic rod (108) is provided at the bottom of the driving ring (106); a telescopic tube (109) is provided on the bottom (103) of the sampling barrel (1); the telescopic rod (108) is inserted into the telescopic tube (109).

8. The sampling device for detecting insulating oil of an oil-immersed transformer according to claim 7, characterized in that: A connecting pipe (5) is provided at the top of the oil inlet pipe (2), the inner diameter of the connecting pipe (5) being the same as the outer diameter of the oil inlet pipe (2), the connecting pipe (5) being sleeved on the top of the oil inlet pipe (2), the top of the connecting pipe (5) being connected to the oil outlet pipe of the transformer, and in an initial state, the top of the first piston (203) is flush with the top of the oil inlet pipe (2), an exhaust pipe (501) is provided on the connecting pipe (5), the exhaust pipe (501) extending outwardly along the radial direction of the connecting pipe (5), the bottom of the exhaust pipe (501) being flush with the top of the oil inlet pipe (2), and a plugging component is provided at the top of the exhaust pipe (501), the plugging component being used to plug the exhaust pipe (501).

9. The sampling device for detecting insulating oil of an oil-immersed transformer according to claim 8, characterized in that: The top end of the exhaust pipe (501) is sealed, an exhaust pipe (502) is provided on the exhaust pipe (501), a second retaining ring (503) is provided in the exhaust pipe (502), a sealing ball (504) is provided in the exhaust pipe (501), the density of the sealing ball (504) is greater than that of air, and the sealing of the sealing ball (504) is less than that of insulating oil, the inner diameter of the second retaining ring (503) is smaller than the diameter of the sealing ball (504), the sealing ball (504) is arranged below the exhaust pipe (502), a guide assembly is provided in the exhaust pipe (501), the sealing ball (504) is connected to the guide assembly, and the guide assembly is used to guide the sealing ball (504) to slide in a vertical direction.

10. The sampling device for detecting insulating oil of an oil-immersed transformer according to claim 9, characterized in that: The guide assembly comprises a guide tube (506) and a diverter plate (505), wherein the diverter plate (505) is horizontally arranged in the exhaust pipe (501), the guide tube (506) is arranged at the bottom of the outlet pipe (502), a plurality of through holes (507) are evenly arranged on the guide tube (506), the blocking ball (504) is arranged in the guide tube (506), an end of the diverter plate (505) away from the connecting tube (5) and a side of the guide tube (506) away from the connecting tube (5), and an inlet hole is arranged on the diverter plate (505), and the inlet hole is arranged at the bottom of the guide tube (506).

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