Transformer with oil sampling device
Through the oil sampling device of negative pressure extraction and check valve assembly, the problems of air inlet and oil waste during the sampling process of oil-immersed transformer are solved, and the safe sampling and saving of oil is achieved.
Patent Information
- Application Number
- CN202422056508.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-23
AI Technical Summary
During the sampling process, existing oil-immersed transformers can easily cause air to enter the inside of the box, causing oil oxidation and failure, and oil is easily wasted after sampling.
The oil sampling device using a negative pressure extraction device and a one-way valve assembly is used to extract the oil through negative pressure and control the flow direction to prevent air from entering the inside of the box and to achieve quantitative sampling.
Effectively prevent air from entering the transformer box, avoid oil oxidation, reduce the risk of failure, and avoid oil waste.
Smart Images
Figure CN223092648U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformers, in particular to a transformer with an oil sampling device. Background Art
[0002] The interior of the existing oil-immersed transformer box is filled with oil, which mainly plays the roles of cooling, arc extinguishing and insulation inside the transformer. When inspecting an oil-immersed transformer after it has been used for a certain period of time, it is an essential inspection item to inspect the oil inside the transformer.
[0003] In order to facilitate the later staff to sample the oil inside the transformer box during the production of the existing oil-immersed transformer, a sampling oil pipe is usually arranged on the outer side of the transformer box. The sampling oil pipe is in a closed state under normal conditions and is usually closed by a plug connected by threads. When sampling is required, it is in an open state, that is, the plug is removed, and the oil inside the transformer flows out from the sampling oil pipe to the outside to complete the sampling process.
[0004] The problems of the existing technology are that directly draining oil through the sampling oil pipe easily causes air to enter the interior of the transformer box from the sampling oil pipe, resulting in accelerated oxidation of the oil inside the transformer box. After multiple samplings, more air enters, and the moisture contained in the air is also likely to cause faults inside the transformer. Secondly, when the transformer uses the sampling oil pipe for sampling, if the plug is not used to block it after sampling, the oil will continue to flow out, resulting in waste of oil. Summary of the Utility Model
[0005] The utility model provides a transformer with an oil sampling device, which can isolate the external air from being discharged during sampling, prevent air from entering the interior of the transformer box, and at the same time, the negative pressure extraction device can control the sampling volume to avoid waste of oil.
[0006] The technical problems solved by the utility model are realized by adopting the following technical solutions:
[0007] A transformer with an oil sampling device includes an oil sampling device installed on the outer side of the transformer box. The oil sampling device includes a negative pressure extraction device, a first pipe body and a second pipe body. One end of the first pipe body is connected to the input end of the negative pressure extraction device, and the other end is communicated with the interior of the transformer box. One end of the second pipe body is connected to the output end of the negative pressure extraction device, and the other end is used for discharging the sampled oil. Check valve assemblies are arranged inside both the first pipe body and the second pipe body. The check valve assembly inside the first pipe body is used to control the one-way flow of oil from the inside of the transformer to the inside of the negative pressure extraction device, and the check valve assembly inside the second pipe body is used to control the flow of the oil inside the negative pressure extraction device to the outside.
[0008] Preferably, there are multiple sampling devices on the outer side of the transformer box body, and the multiple sampling devices are at different heights on the outer side of the transformer box body.
[0009] Preferably, the negative pressure extraction device includes a cylinder fixed on the outer side of the transformer box body, a piston inside the cylinder, and a handle for driving the piston to move along the inside of the cylinder.
[0010] Preferably, the one-way valve assembly includes an inner cylinder inside the first pipe body and the second pipe body, a guide frame formed on the bottom wall of the inner cylinder, an oil outlet formed on the top wall of the inner cylinder, and a movable core rod at the central position of the inner cylinder. A sealing ring for abutting and sealing the oil outlet is arranged at the upper part of the movable core rod. A ring plate is arranged at the lower part of the movable core rod. A spring is sleeved outside the movable core rod between the ring plate and the guide frame.
[0011] Preferably, a transparent observation window is arranged on the outer surface of the cylinder.
[0012] Preferably, a threaded plug cap is arranged at one end of the second pipe body away from the negative pressure extraction device.
[0013] Preferably, it further includes a cover shell installed on the outer side wall of the transformer box body for protecting the sampling device.
[0014] The beneficial effects of the present utility model are as follows: Through the negative pressure extraction device, the first pipe body and the second pipe body, the oil liquid inside the transformer box body can be extracted under negative pressure, thereby avoiding air entering the transformer box body during the oil liquid sampling process, resulting in accelerated oxidation of the oil liquid inside the transformer box body, or the transformer box body having more air with moisture, leading to transformer operation failures.
[0015] Extracting oil samples through the negative pressure extraction device can achieve quantitative extraction and avoid oil liquid waste during the sampling process. Description of the Drawings
[0016] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0017] Figure 1 It is a structural schematic diagram of the present utility model:
[0018] Figure 2 It is a structural schematic diagram of the sampling device of the present utility model;
[0019] Figure 3 Schematic cross-sectional view of the present utility model Figure 2 ;
[0020] Figure 4 Magnified schematic view of part A in the present utility model Figure 3 ;
[0021] Figure 5 Schematic structural view of the housing and the sampling device of the present utility model separated
[0022] Figure 6 Schematic structural view of the housing of the present utility model installed on the sampling device
[0023] In the figure, 1 is the transformer box body; 2 is the oil sampling device; 3 is the housing; 4 is the first pipe body; 5 is the second pipe body; 6 is the cylinder body; 7 is the mounting plate; 8 is the handle; 9 is the one-way valve assembly; 901 is the inner cylinder; 902 is the guide frame; 903 is the movable core rod; 904 is the ring plate; 905 is the spring; 906 is the oil outlet; 907 is the sealing ring; 10 is the bolt; 11 is the threaded sealing cap Detailed implementation manners
[0024] In order to make the technical means, creative features, achieved purposes and functions realized by the present utility model easy to understand, the present utility model will be further described below with reference to specific drawings
[0025] Refer to Figures 1 - 6 , a transformer with an oil sampling device, which includes an oil sampling device 2 installed outside the transformer box body 1. The oil sampling device 2 includes a negative pressure extraction device, a first pipe body 4 and a second pipe body 5. One end of the first pipe body 4 is connected to the input end of the negative pressure extraction device, and the other end is communicated with the inside of the transformer box body 1. One end of the second pipe body 5 is connected to the output end of the negative pressure extraction device, and the other end is used to discharge the sampled oil. One-way valve assemblies 9 are provided inside both the first pipe body 4 and the second pipe body 5. The one-way valve assembly 9 inside the first pipe body 4 is used to control the one-way flow of oil from inside the transformer to inside the negative pressure extraction device, and the one-way valve assembly 9 inside the second pipe body 5 is used to control the flow of oil inside the negative pressure extraction device to the outside. During sampling, the negative pressure extraction device is operated to generate negative pressure. At this time, the one-way valve assembly 9 inside the first pipe body 4 is opened, and the one-way valve assembly 9 inside the second pipe body 5 is closed. The oil inside the transformer box body 1 enters the inside of the negative pressure extraction device. Then, the negative pressure extraction device is operated to discharge the oil inside. During the process of discharging the oil, the one-way valve assembly 9 inside the first pipe body 4 is in the closed state, and the one-way valve assembly 9 inside the second pipe body 5 is in the open state. Since the oil does not contact the external air during the extraction process, during the oil sampling process, the external air will not enter the inside of the transformer box body 1
[0026] Specifically, referring to Figure 1 , Figure 5 and Figure 6 , there are multiple sampling devices on the outer side of the transformer tank body 1, and the multiple sampling devices are at different heights on the outer side of the transformer tank body 1. The multiple sampling devices can complete sampling at different heights inside the transformer tank body 1, so as to facilitate comprehensive judgment of the quality of the oil inside the transformer tank body 1.
[0027] Specifically, referring to Figure 3 , the negative pressure extraction device includes a cylinder body 6 fixed on the outer side of the transformer tank body 1, a piston inside the cylinder body 6, and a handle 8 for driving the piston to move along the inside of the cylinder body 6. Both the first pipe body 4 and the second pipe body 5 are connected to the bottom of the cylinder body 6. When extracting oil, the handle 8 is lifted to drive the piston to move upward along the inside of the cylinder body 6, so that a negative pressure is generated inside the cylinder body 6. During the process of discharging oil, the threaded plug cap 11 (proposed below) is removed, and the handle 8 is pressed down to make the piston extrude the oil to achieve the discharge of the oil.
[0028] Specifically, referring to Figure 4 , the one-way valve assembly 9 includes an inner cylinder 901 inside the first pipe body 4 and the second pipe body 5, a guide frame 902 formed on the bottom wall of the inner cylinder 901 (the edge of the guide frame 902 is hollowed out to facilitate the flow of oil, and there are holes in the middle for guiding the movable core rod 903), an oil outlet 906 formed on the top wall of the inner cylinder 901, and a movable core rod 903 at the central position of the inner cylinder 901. A plugging ring 907 for abutting and sealing the oil outlet 906 is arranged at the upper part of the movable core rod 903, a ring plate 904 is arranged at the lower part of the movable core rod 903, and a spring 905 is sleeved outside the movable core rod 903 between the ring plate 904 and the guide frame 902. The one-way valve assembly 9 is mainly used to control the one-way flow of oil. Taking the movement process of the one-way valve assembly 9 inside the first pipe body 4 as an example, when the handle 8 is lifted to drive the piston to move upward along the cylinder body 6, the negative pressure inside the cylinder body 6 drives the generation of negative pressure inside the first pipe body 4. At this time, the pressure inside the transformer tank body 1 is greater than the pressure inside the cylinder body 6, and the oil inside the transformer tank body 1 passes through the guide frame 902 and enters the inside of the inner cylinder 901, impacting the plugging ring 907 at the position of the oil outlet 906 of the inner cylinder 901, thereby driving the entire movable core rod 903 to move upward. During the upward movement of the movable core rod 903, the spring 905 is compressed through the ring plate 904. At this time, the oil enters the inside of the cylinder body 6 from the oil outlet 906. When the inside of the cylinder body 6 enters the oil and is not in a negative pressure state, the spring 905 resets to drive the plugging ring 907 of the movable core rod 903 to seal the oil outlet 906. This is the process of extracting oil. The one-way valve assembly 9 inside the second pipe body 5 has the same principle as the one-way valve assembly 9 inside the first pipe body 4, but the installation direction is opposite, and it is used to control the one-way flow of oil from the inside of the cylinder body 6 to the outside, which will not be elaborated further here.
[0029] Further, referring to Figure 2 , in order to facilitate observing the amount of oil in the cylinder body 6, a transparent observation window 601 is provided on the outer surface of the cylinder body 6. The transparent observation window 601 enables personnel to clearly know the oil content inside the cylinder body 6. Further, scales can be set on the transparent observation window 601 to achieve accurate extraction.
[0030] Further, referring to Figure 2 , in order to make the second pipe body 5 have better sealing performance when not sampling, by setting a threaded plug cap 11, the sealing performance of the second pipe body 5 can be further improved.
[0031] Further, referring to Figure 5 and Figure 6 , in order to prevent personnel from misoperating the handle 8, a protective cover 3 is also provided outside the oil sampling device 2. Mounting plates 7 are provided on the side walls of the transformer tank 1 and on both sides of the oil sampling device 2. The protective cover 3 is fixed to the mounting plates 7 by bolts 10 to protect the oil sampling device 2 and prevent personnel from accidentally touching the handle 8 when not sampling.
[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.
Claims
1. A transformer with an oil sampling device, comprising an oil sampling device (2) installed outside the transformer box body (1), characterized in that, The oil sampling device (2) includes a negative pressure extraction device, a first pipe body (4) and a second pipe body (5). One end of the first pipe body (4) is connected to the input end of the negative pressure extraction device, and the other end is communicated with the inside of the transformer box body (1). One end of the second pipe body (5) is connected to the output end of the negative pressure extraction device, and the other end is used to discharge the sampled oil. Check valve assemblies (9) are arranged inside both the first pipe body (4) and the second pipe body (5). The check valve assembly (9) inside the first pipe body (4) is used to control the one-way flow of oil from the inside of the transformer to the inside of the negative pressure extraction device, and the check valve assembly (9) inside the second pipe body (5) is used to control the flow of the oil inside the negative pressure extraction device to the outside.
2. The transformer with an oil sampling device according to claim 1, characterized in that, There are multiple sampling devices on the outer side of the transformer box body (1), and the multiple sampling devices are at different heights on the outer side of the transformer box body (1).
3. A transformer with an oil sampling device according to claim 1, characterized in that, The negative pressure extraction device includes a cylinder body (6) fixed on the outer side of the transformer box body (1), a piston inside the cylinder body (6), and a handle (8) for driving the piston to move along the inside of the cylinder body (6).
4. A transformer with an oil sampling device according to claim 1, characterized in that, The check valve assembly (9) includes an inner cylinder (901) inside the first pipe body (4) and the second pipe body (5), a guide frame (902) formed on the bottom wall of the inner cylinder (901), an oil outlet (906) formed on the top wall of the inner cylinder (901), and a movable core rod (903) at the central position of the inner cylinder (901). A sealing ring (907) for abutting and sealing the oil outlet (906) is arranged at the upper part of the movable core rod (903). A ring plate (904) is arranged at the lower part of the movable core rod (903). A spring (905) is sleeved outside the movable core rod (903) between the ring plate (904) and the guide frame (902).
5. The transformer with an oil sampling device according to claim 3, characterized in that, A transparent observation window (601) is arranged on the outer surface of the cylinder body (6).
6. A transformer with an oil sampling device according to any one of claims 1 or 4, characterized in that, A threaded plug cap (11) is arranged at one end of the second pipe body (5) far from the negative pressure extraction device.
7. The transformer with an oil sampling device according to claim 1, wherein, It also includes a cover shell (3) installed on the outer side wall of the transformer box body (1) for protecting the sampling device.