Circulating oil taking device

Abstract

The invention belongs to the technical field of sampling equipment, and discloses a circulating oil taking device. In the sampling process, an oil sample in the oil taking pipe of the transformer can be temporarily stored in the first cavity, a representative oil sample in the transformer is guided into the second cavity for sampling, then the oil sample in the first cavity flows back to the interior of the transformer, and oil discharged in the initial stage is recycled; according to the invention, waste of transformer oil is reduced to the greatest extent in the whole sampling process, the influence of sampling on the oil level of the transformer is reduced, and the oil supplementing requirement is reduced, so that the operation and maintenance workload and the maintenance cost are greatly reduced, and the efficiency of an oiling test and overhaul work is improved; moreover, it is ensured that the oil sample sampled each time is from a representative oil sample in the transformer body, and the accuracy and reliability of the detection result are improved.

Description

Technical Field

[0001] The invention relates to the technical field of sampling equipment, in particular to a circulating sampling device. Background Art

[0002] In the daily operation and maintenance of substations, sampling and testing of transformer oil is a crucial link, which aims to monitor the quality status of the insulating oil inside the transformer to ensure the safe operation of the equipment.

[0003] Normally, the transformer is equipped with an oil extraction pipe extending to the outside. The oil in the oil extraction pipe is a static oil sample. It has not flowed for a long time and is not representative. It cannot truly reflect the actual situation of the insulating oil inside the transformer body. Therefore, when taking samples, the staff must first drain the stored oil in the pipe to ensure that the oil sample obtained comes from the inside of the transformer body. This results in each oil extraction operation leading to a reduction in the amount of oil inside the transformer, which in turn causes the oil level inside the equipment to drop.

[0004] To this end, the maintenance team needs to add new transformer oil after each sampling to keep the equipment in normal operation. Frequent oil sampling and oil level replenishment have increased the operation and maintenance costs to a certain extent and reduced the sampling efficiency.

[0005] Therefore, there is an urgent need for a circulating oil extraction device to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a circulating oil extraction device, which can reduce the operation and maintenance workload and maintenance costs, improve the efficiency of oil testing and maintenance work, and improve the accuracy and reliability of detection results.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] The circulating oil extraction device comprises:

[0009] A cylinder body, wherein a first cavity and a second cavity are connected to each other, the diameter of the first cavity is larger than the diameter of the second cavity, a limit platform is provided at the bottom end of the first cavity, the first cavity is provided with a first oil inlet and a first oil outlet, and the second cavity is provided with a second oil inlet and a second oil outlet;

[0010] a connecting pipe, one end of which is connected to the first oil inlet, and the other end of which is connected to the second oil inlet;

[0011] A piston assembly, comprising a first piston and a second piston, wherein the first piston is slidably disposed in the first cavity and can abut against the limit platform to separate the first cavity and the second cavity, and the second piston is slidably disposed in the second cavity;

[0012] A driving assembly is configured to drive the first piston and the second piston to slide along the first cavity, or to drive the second piston to slide along the second cavity.

[0013] Optionally, the driving assembly comprises:

[0014] a sleeve, one end of which is connected to the second piston and the other end of which is slidably disposed in the second cavity;

[0015] a first rod, one end of which is connected to the first piston, and the other end of which passes through the second piston and the sleeve;

[0016] an elastic member, sleeved on the first rod, wherein one end of the elastic member abuts against one end of the first rod away from the first piston, and the other end abuts against the sleeve;

[0017] A driving member, wherein an output end of the driving member is connected to the sleeve, and the driving member is configured to drive the sleeve to drive the second piston and / or the first piston to move.

[0018] Optionally, a stopper is provided at one end of the first rod away from the first piston, one end of the elastic member abuts against the stopper, and the other end abuts against the sleeve.

[0019] Optionally, the limiting member is detachably connected to the first rod.

[0020] Optionally, the driving member comprises:

[0021] A mounting frame connected to the cylinder body;

[0022] A driving motor is arranged on the mounting frame;

[0023] A lead screw, one end of which is rotatably connected to the mounting frame, and the other end of which is drivingly connected to the output shaft of the drive motor;

[0024] A nut block is fixed on the outer wall of the sleeve and is threadedly connected to the lead screw.

[0025] Optionally, a connecting one-way valve is provided on the connecting pipe, and the connecting one-way valve is used to allow the oil sample in the connecting pipe to flow to the second cavity in one direction.

[0026] Optionally, the circulating oil extraction device further comprises a sampling tube and a sampling one-way valve, wherein one end of the sampling tube is connected to the second oil outlet, and the other end can be connected to a sampling container, and the sampling one-way valve is arranged on the sampling tube.

[0027] Optionally, the circulating oil extraction device also includes an oil outlet pipe and an oil outlet one-way valve, one end of the oil outlet pipe is connected to the transformer oil extraction pipe, and the other end is connected to the first oil inlet, and the oil outlet one-way valve is arranged on the oil outlet pipe.

[0028] Optionally, the circulating oil extraction device also includes an oil inlet pipe and an oil inlet one-way valve, one end of the oil inlet pipe is connected to the first oil outlet, and the other end is connected to the transformer refueling port, and the oil inlet one-way valve is arranged on the oil inlet pipe.

[0029] Optionally, the cylinder block includes a cylinder body and a cylinder cover, the cylinder cover is detachably mounted on the cylinder body, and the first oil inlet is arranged on the cylinder cover.

[0030] Beneficial effects:

[0031] Before sampling, the first piston and the second piston are both located at the top of the first cavity; when it is necessary to sample the transformer oil in the transformer, the first oil inlet is connected to the transformer oil extraction pipe, the first oil outlet is connected to the transformer refueling port, and the second oil outlet is connected to the sampling container. The driving component drives the first piston and the second piston to move downward synchronously, thereby absorbing the oil sample in the transformer oil extraction pipe into the first cavity, until the first piston abuts on the limit table, the driving component continues to drive the second piston to slide downward along the second cavity, and through the action of the connecting pipe, the representative oil sample from the inside of the transformer is absorbed into the second cavity. After the absorption is completed, the driving component drives the second piston to move upward first, and the representative oil sample in the second cavity is transported to the sampling container through the second oil outlet. Subsequently, after the second piston moves to abut against the first piston, the first piston and the second piston move upward synchronously, and the oil sample in the first cavity is transported back to the transformer through the transformer refueling port.

[0032] The circulating oil extraction device provided by the present invention can temporarily store the oil sample in the transformer oil extraction pipe in the first cavity during the sampling process, introduce the representative oil sample inside the transformer into the second cavity for sampling, and then return the oil sample in the first cavity to the inside of the transformer, so as to recycle the oil discharged in the early stage, so as to minimize the waste of transformer oil in the whole sampling process, reduce the influence of sampling on the transformer oil level, reduce the demand for oil replenishment, thereby greatly reducing the operation and maintenance workload and maintenance cost, and thus improving the efficiency of oiling test and maintenance work; and ensure that the oil sample sampled each time is a representative oil sample from the inside of the transformer body, thereby improving the accuracy and reliability of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the circulating oil extraction device provided by the present invention;

[0034] Figure 2It is a cross-sectional view of the circulating oil extraction device provided by the present invention.

[0035] In the figure:

[0036] 100, cylinder body; 101, cylinder body; 102, cylinder head; 110, first cavity; 111, limit table; 112, first oil inlet; 113, first oil outlet; 114, second oil inlet; 115, second oil outlet; 120, second cavity;

[0037] 200, connecting pipe; 210, connecting one-way valve;

[0038] 310, first piston; 320, second piston;

[0039] 400, driving assembly; 410, sleeve; 420, first rod; 421, stopper; 430, elastic member; 440, driving member; 441, mounting frame; 442, driving motor; 443, lead screw; 444, nut block;

[0040] 500, sampling tube; 510, sampling one-way valve;

[0041] 600, oil outlet pipe; 610, oil outlet check valve;

[0042] 700, oil inlet pipe; 710, oil inlet check valve. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0047] This embodiment provides a circulating oil extraction device, such as Figure 1-Figure 2 As shown, the circulating oil extraction device includes a cylinder body 100, a connecting pipe 200, a piston assembly and a driving assembly 400. The cylinder body 100 is provided with a first cavity 110 and a second cavity 120 which are connected to each other. The diameter of the first cavity 110 is larger than the diameter of the second cavity 120. The bottom end of the first cavity 110 is provided with a limit platform 111. The first cavity 110 is provided with a first oil inlet 112 and a first oil outlet 113. The second cavity 120 is provided with a second oil inlet 114 and a second oil outlet 115. One end of the connecting pipe 200 is connected to the first inlet. The oil port 112 is connected, and the other end is connected to the second oil inlet 114; the piston assembly includes a first piston 310 and a second piston 320, the first piston 310 is slidably set in the first cavity 110, and can abut against the limit platform 111 to separate the first cavity 110 and the second cavity 120, and the second piston 320 is slidably set in the second cavity 120; the driving assembly 400 is used to drive the first piston 310 and the second piston 320 to slide along the first cavity 110, or drive the second piston 320 to slide along the second cavity 120.

[0048] Before sampling, the first piston 310 and the second piston 320 are both located at the top of the first cavity 110; when it is necessary to sample the transformer oil in the transformer, the first oil inlet 112 is connected to the transformer oil extraction pipe, the first oil outlet 113 is connected to the transformer oil filling port, and the second oil outlet 115 is connected to the sampling container, and the driving component 400 drives the first piston 310 and the second piston 320 to move downward synchronously, so as to absorb the oil sample in the transformer oil extraction pipe into the first cavity 110, until the first piston 310 abuts against the limit platform 111, and the driving component 400 continues to drive the second piston 310 to move downward synchronously. The piston 320 slides downward along the second cavity 120, and through the action of the connecting pipe 200, the representative oil sample from the transformer is sucked into the second cavity 120. After the suction is completed, the driving component 400 drives the second piston 320 to move upward first, and the representative oil sample in the second cavity 120 is transported to the sampling container through the second oil outlet 115. Then, after the second piston 320 moves to abut against the first piston 310, the first piston 310 and the second piston 320 move upward synchronously, and the oil sample in the first cavity 110 is transported back to the transformer through the transformer refueling port.

[0049] During the sampling process, the circulating oil extraction device can temporarily store the oil sample in the transformer oil extraction pipe in the first cavity 110, introduce the representative oil sample inside the transformer into the second cavity 120 for sampling, and then return the oil sample in the first cavity 110 to the inside of the transformer, recycling the oil discharged in the early stage, so that the whole sampling process can minimize the waste of transformer oil, reduce the impact of sampling on the transformer oil level, and reduce the demand for oil replenishment, thereby greatly reducing the operation and maintenance workload and maintenance costs, thereby improving the efficiency of oil testing and maintenance work; and ensuring that the oil sample sampled each time is a representative oil sample from the inside of the transformer body, improving the accuracy and reliability of the detection results.

[0050] Alternatively, if Figure 1 and Figure 2As shown, the drive assembly 400 includes a sleeve 410, a first rod 420, an elastic member 430 and a drive member 440. One end of the sleeve 410 is connected to the second piston 320, and the other end is slidably penetrated in the second cavity 120. One end of the first rod 420 is connected to the first piston 310, and the other end passes through the second piston 320 and the sleeve 410. The elastic member 430 is sleeved on the first rod 420, and one end of the elastic member 430 abuts against one end of the first rod 420 away from the first piston 310, and the other end abuts against the sleeve 410; the output end of the drive member 440 is connected to the sleeve 410, and the drive member 440 is configured to drive the sleeve 410 to drive the second piston 320 and / or the first piston 310 to move. Specifically, when the driving member 440 drives the sleeve 410 to descend, the elastic member 430 drives the first piston 310 and the second piston 320 to move downward synchronously, and the oil sample in the transformer oil extraction pipe is extracted into the first cavity 110; when the first piston 310 abuts against the limit platform 111, the first piston 310 separates the first cavity 110 and the second cavity 120. At this time, the driving member 440 continues to drive the sleeve 410 to descend, and the elastic member 430 begins to be compressed. With the elastic force of the elastic member 430, the first piston 310 is pressed against the limit platform 111. At the same time, the second piston 320 descends with the sleeve 410, and the representative oil sample inside the transformer is extracted into the second cavity 120 through the connecting pipe 200; After the extraction is completed, the driving member 440 drives the sleeve 410 to drive the second piston 320 to rise (when the second piston 320 rises, with the help of the elastic force of the elastic member 430, the first piston 310 is still pressed on the limit platform 111), and the representative oil sample in the second cavity 120 is discharged into the sampling container through the second oil outlet 115 to complete the sampling. When the second piston 320 rises to abut against the first piston 310, the elastic member 430 is reset, and the second piston 320 and the first piston 310 rise synchronously, and the oil sample in the first cavity 110 is returned to the interior of the transformer through the first oil outlet 113, which helps to protect the environment and saves resources by reducing unnecessary loss of oil products, which is in line with the concept of energy conservation and emission reduction.

[0051] In this embodiment, under the coordinated action of the driving member 440 and the elastic member 430, the first piston 310 and the second piston 320 move in stages, realizing an efficient oil extraction cycle, ensuring the quality of sampling, reducing the waste of transformer oil, reducing the number of oil replenishment times, and effectively improving the daily operation and maintenance efficiency and economy of the transformer.

[0052] Alternatively, if Figure 2 As shown, a limiter 421 is provided at one end of the first rod 420 away from the first piston 310, one end of the elastic member 430 abuts against the limiter 421, and the other end abuts against the sleeve 410. The limiter 421 provides stable support for the elastic member 430 to ensure that the position of the elastic member 430 is more stable.

[0053] Optionally, the stopper 421 is detachably connected to the first rod 420, which facilitates the installation and removal of the elastic member 430. In this embodiment, the stopper 421 is threadedly connected to the first rod 420, and the threaded connection method can make the connection between the stopper 421 and the first rod 420 more secure, and the maintenance personnel only need to rotate the stopper 421 to easily remove the stopper 421 from the first rod 420, which provides great convenience for replacing or repairing the elastic member 430.

[0054] In this embodiment, the elastic member 430 is a spring. When the first piston 310 abuts against the limit platform 111, the spring firmly presses it against the limit platform 111 through elastic force, forming a reliable sealing separation, ensuring the accuracy of transformer oil sampling, helping to prevent the old oil in the transformer oil pipeline from mixing into the new oil sample, and improving the accuracy of oil sampling.

[0055] Optionally, the driving member 440 includes a mounting frame 441, a driving motor 442, a lead screw 443 and a nut block 444. The mounting frame 441 is connected to the cylinder body 100, the driving motor 442 is arranged on the mounting frame 441, one end of the lead screw 443 is drivingly connected to the output shaft of the driving motor 442, and the other end is rotatably connected to the mounting frame 441, the nut block 444 is fixed on the outer wall of the sleeve 410, and the nut block 444 is threadedly connected to the lead screw 443. The driving motor 442 drives the lead screw 443 to rotate, and the transmission structure in which the lead screw 443 and the nut block 444 are threadedly connected can ensure that the sleeve 410 drives the second piston 320 to move up and down. The setting of the driving member 440 makes it no longer necessary to intervene manually during the oil extraction process. The operation and maintenance personnel only need to operate the driving motor 442 to accurately adjust the movement positions of the first piston 310 and the second piston 320, thereby improving the sampling efficiency and convenience.

[0056] Alternatively, if Figure 2 As shown, a connecting one-way valve 210 is provided on the connecting tube 200. The connecting one-way valve 210 is used to allow the oil sample in the connecting tube 200 to flow unidirectionally to the second cavity 120, thereby preventing the oil sample from flowing back to the first cavity 110 during the sampling process, thereby ensuring the unidirectional flow of the oil sample in the device and helping to improve the stability and accuracy of sampling.

[0057] Optionally, the circulating oil extraction device also includes a sampling tube 500 and a sampling one-way valve 510. One end of the sampling tube 500 is connected to the second oil outlet 115, and the other end can be connected to the sampling container. The sampling one-way valve 510 is arranged on the sampling tube 500. The sampling one-way valve 510 only allows representative oil samples to flow from the second oil outlet 115 to the sampling container, thereby preventing external impurities or air from flowing back to the circulating oil extraction device through the sampling tube 500, thereby ensuring the cleanliness and authenticity of the oil sample.

[0058] Optionally, the circulating oil extraction device further includes an oil outlet pipe 600 and an oil outlet check valve 610. One end of the oil outlet pipe 600 is connected to the transformer oil outlet pipe, and the other end is connected to the first oil inlet 112. The oil outlet check valve 610 is arranged on the oil outlet pipe 600. The oil outlet check valve 610 only allows the oil sample to flow from the transformer oil outlet pipe to the first oil inlet 112, so as to prevent the oil sample from flowing back to the transformer during the extraction process, thereby ensuring the purity and representativeness of the oil sample when it flows into the transformer and ensuring the accuracy of sampling.

[0059] Alternatively, if Figure 2 As shown, the circulating oil extraction device also includes an oil inlet pipe 700 and an oil inlet check valve 710. One end of the oil inlet pipe 700 is connected to the first oil outlet 113, and the other end is connected to the transformer refueling port. The oil inlet check valve 710 is arranged on the oil inlet pipe 700. The oil inlet check valve 710 only allows the oil sample to flow from the first oil outlet 113 to the transformer refueling port, ensuring that the oil sample not collected in the first cavity 110 can smoothly flow back to the inside of the transformer, which not only avoids the waste of transformer oil, but also reduces the maintenance cost.

[0060] Optionally, the cylinder 100 includes a cylinder body 101 and a cylinder cover 102, the cylinder cover 102 is detachably mounted on the cylinder body 101, and the first oil inlet 112 is provided on the cylinder cover 102. The detachable design of the cylinder cover 102 allows the cylinder 100 to be easily opened during equipment maintenance, so as to facilitate cleaning of the internal oil circuit and components, ensure the cleanliness of the cylinder 100 and the purity of the oil, and help extend the service life of the circulating oil extraction device. In this embodiment, the cylinder cover 102 is fastened to the cylinder body 101 by fastening screws.

[0061] like Figure 1-Figure 2 As shown, the working process and principle of the circulating oil extraction device provided in this embodiment are as follows:

[0062] When sampling, first connect the oil outlet pipe 600 to the transformer oil extraction pipe, connect the oil inlet pipe 700 to the transformer oil filling pipe, connect the sampling container to the sampling tube 500, and then drive the motor 442 to drive the lead screw 443 to rotate, and the rotation of the lead screw 443 drives the nut block 444 to move downward. In the initial state, the first piston 310 and the second piston 320 are both located at the uppermost end, and the nut block 444 moves downward to drive the sleeve 410 and then squeeze the spring to drive the first rod 420 to move downward, thereby driving the first piston 310 to move downward. The downward movement of the first piston 310 causes the oil in the oil extraction pipe to be sucked into the first cavity 110 of the cylinder body 100 through the oil inlet pipe 700; when the first piston 310 moves to the lower end of the first cavity 110, it is hindered by the limit platform 111, and the sleeve 410 drives the second piston 320 to overcome the spring force and move downward, thereby squeezing the spring The spring causes the second piston 320 to move downward in the second cavity 120, and then the oil in the transformer moves downward into the second cavity 120 through the oil inlet pipe 700, the connecting pipe 200, and the connecting one-way valve 210 in sequence, and then the driving motor 442 rotates in the opposite direction to drive the second piston 320 to move upward, and the second piston 320 discharges the oil in the second cavity 120 outward through the sampling tube 500. When the second piston 320 moves to contact the first piston 310, the second piston 320 drives the first piston 310 to move upward, and then the oil in the first cavity 110 is transported back to the transformer through the oil inlet pipe 700 and the transformer refueling port, thereby transporting the oil in the initial stage of the transformer oil extraction pipe back to the transformer, and only sampling the clean transformer oil in the later stage of the transformer oil extraction pipe discharge, thereby increasing the sampling accuracy and avoiding oil waste interference at the bottom of the transformer.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. 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 claims of the present invention.

Claims

1. Circulating oil extraction device, characterized in that: include: A cylinder body (100), wherein a first cavity (110) and a second cavity (120) which are interconnected are provided in the cylinder body (100), the diameter of the first cavity (110) is larger than the diameter of the second cavity (120), a limiting platform (111) is provided at the bottom end of the first cavity (110), the first cavity (110) is provided with a first oil inlet (112) and a first oil outlet (113), and the second cavity (120) is provided with a second oil inlet (114) and a second oil outlet (115); A connecting pipe (200), one end of which is connected to the first oil inlet (112), and the other end of which is connected to the second oil inlet (114); A piston assembly, comprising a first piston (310) and a second piston (320), wherein the first piston (310) is slidably disposed in the first cavity (110) and can abut against the limiting platform (111) to separate the first cavity (110) and the second cavity (120), and the second piston (320) is slidably disposed in the second cavity (120); A driving assembly (400) is configured to drive the first piston (310) and the second piston (320) to slide along the first cavity (110), or to drive the second piston (320) to slide along the second cavity (120).

2. The circulating oil extraction device according to claim 1, characterized in that: The driving assembly (400) comprises: A sleeve (410), one end of which is connected to the second piston (320) and the other end of which is slidably disposed in the second cavity (120); a first rod (420), one end of the first rod (420) being connected to the first piston (310), and the other end of the first rod (420) passing through the second piston (320) and the sleeve (410); An elastic member (430) is sleeved on the first rod (420), one end of the elastic member (430) abuts against an end of the first rod (420) away from the first piston (310), and the other end abuts against the sleeve (410); A driving member (440), wherein an output end of the driving member (440) is connected to the sleeve (410), and the driving member (440) is configured to drive the sleeve (410) to drive the second piston (320) and / or the first piston (310) to move.

3. The circulating oil extraction device according to claim 2, characterized in that: A stopper (421) is provided at one end of the first rod (420) away from the first piston (310); one end of the elastic member (430) abuts against the stopper (421), and the other end abuts against the sleeve (410).

4. The circulating oil extraction device according to claim 3, characterized in that: The limiting member (421) is detachably connected to the first rod (420).

5. The circulating oil extraction device according to claim 2, characterized in that: The driving member (440) comprises: A mounting frame (441) connected to the cylinder body (100); A driving motor (442) is arranged on the mounting frame (441); A lead screw (443), one end of which is rotatably connected to the mounting frame (441), and the other end of which is drivingly connected to the output shaft of the driving motor (442); A nut block (444), wherein the nut block (444) is fixed on the outer wall of the sleeve (410), and the nut block (444) is threadedly connected to the lead screw (443).

6. The circulating oil extraction device according to claim 1, characterized in that: The connecting pipe (200) is provided with a connecting check valve (210), and the connecting check valve (210) is used to allow the oil sample in the connecting pipe (200) to flow in one direction to the second cavity (120).

7. The circulating oil extraction device according to claim 1, characterized in that: The circulating oil extraction device further comprises a sampling tube (500) and a sampling one-way valve (510); one end of the sampling tube (500) is connected to the second oil outlet (115), and the other end can be connected to a sampling container; the sampling one-way valve (510) is arranged on the sampling tube (500).

8. The circulating oil extraction device according to claim 1, characterized in that: The circulating oil extraction device further comprises an oil outlet pipe (600) and an oil outlet one-way valve (610); one end of the oil outlet pipe (600) is connected to the transformer oil outlet pipe, and the other end is connected to the first oil inlet (112); the oil outlet one-way valve (610) is arranged on the oil outlet pipe (600).

9. The circulating oil extraction device according to claim 1, characterized in that: The circulating oil extraction device further comprises an oil inlet pipe (700) and an oil inlet check valve (710); one end of the oil inlet pipe (700) is connected to the first oil outlet (113), and the other end is connected to the transformer oil filling port; the oil inlet check valve (710) is arranged on the oil inlet pipe (700).

10. The circulating oil extraction device according to claim 1, characterized in that: The cylinder block (100) comprises a cylinder body (101) and a cylinder head (102); the cylinder head (102) is detachably mounted on the cylinder body (101); and the first oil inlet (112) is arranged on the cylinder head (102).

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