Valve and transformer

Abstract

The utility model discloses a valve and transformer relates to transformer technical field, the valve includes valve body, first spool, ball and second spool, wherein the inside of valve body is provided with main channel, first liquid outlet channel, accommodation cavity and spool cavity, main channel includes liquid inlet and liquid outlet, the first liquid outlet channel includes the liquid inlet and the liquid outlet, the second liquid outlet channel includes the liquid inlet and the liquid outlet. The first liquid outlet channel communicates with the main channel, and the communicating position is located between the liquid inlet and the liquid outlet. The containing cavity is communicated with the liquid outlet, and the valve element cavity is communicated with the containing cavity. The first valve element is installed between the liquid inlet and the first liquid outlet channel and used for opening or closing the main channel. The ball is arranged in the containing cavity, one end of the second valve element is installed in the valve element cavity and provided with a second liquid outlet channel, the second valve element is provided with a side hole, and the side hole is communicated with the second liquid outlet channel and the valve element cavity. The second valve element can stretch out of or retract into the valve element cavity so as to release or press the ball. By means of the scheme, the process is simple when the oil liquid online monitoring device is additionally installed, and the direct cost and the indirect cost in the adding process are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, and particularly relates to a valve and a transformer. Background Art

[0002] During the use of a transformer, it is necessary to periodically take samples of the transformer oil in the transformer tank for chemical analysis. There are usually two ways to take samples for chemical analysis. One is to automatically take samples through an on-line oil monitoring device, and the other is to take oil manually and then analyze the oil sample. The analysis results of the two methods can be compared and analyzed to ensure the credibility of the analysis results. Usually, the on-line oil monitoring device needs to take samples automatically at regular intervals, and the valve of this device needs to be in an open state, while the valve for manual oil sampling needs to be in a normally closed state. Therefore, the valves for these two sampling and chemical analysis methods cannot be shared. For some transformers that have been in operation, usually only a valve for manual oil sampling is provided during construction, and the later installation of an on-line oil monitoring device is not considered. When installing an on-line oil monitoring device later, it is necessary to open another hole in the tank and install a valve, and operations such as power-off, lifting the tank, welding the oil pipeline, and cleaning the tank are required, resulting in cumbersome installation steps and high installation costs.

[0003] In view of this, it is necessary to propose a valve and a transformer to solve or at least alleviate the above technical problems. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a valve and a transformer, aiming to solve the technical problems of cumbersome operation steps and high costs when installing an on-line oil monitoring device on a transformer tank.

[0005] To achieve the above purpose, the utility model proposes a valve, including:

[0006] A valve body, in which a main channel, a first liquid outlet channel, a receiving cavity and a valve core cavity are arranged. The main channel includes a liquid inlet and a liquid outlet, and the first liquid outlet channel is communicated with the main channel, and the communication position is between the liquid inlet and the liquid outlet;

[0007] The receiving cavity is communicated with the liquid outlet, and the valve core cavity is communicated with the receiving cavity;

[0008] A first valve core, which is installed on the flow path between the liquid inlet and the first liquid outlet channel and is used to open or close the main channel;

[0009] A ball, which is arranged in the receiving cavity and can seal the liquid outlet;

[0010] Second spool, one end of the second spool is installed in the spool cavity, a second liquid outlet channel is arranged inside the second spool, and a side hole is opened at one end of the second spool installed in the spool cavity, and the side hole is communicated with the second liquid outlet channel;

[0011] The second spool can retract into the spool cavity to press the ball;

[0012] The second spool can extend out of the spool cavity to release the ball.

[0013] In one embodiment, the valve further includes a protective sleeve, and the protective sleeve is sleeved on one end of the second spool away from the ball for closing the second liquid outlet channel.

[0014] In one embodiment, the valve further includes a valve cover, the valve cover is arranged at one end of the valve body where the second spool is installed, and the valve cover covers the outside of the second spool.

[0015] In one embodiment, the valve body is further provided with a valve chamber communicated with the outside, the valve chamber is communicated with the main channel, and the valve chamber is arranged between the liquid inlet and the first liquid outlet channel;

[0016] The first spool includes a plug and a plug rod fixedly connected to the plug, the plug is rotatably arranged in the valve chamber, the plug is provided with a through hole, and the plug rod can drive the plug to rotate so that the through hole is communicated with or disconnected from the main channel.

[0017] In one embodiment, the valve further includes a plug cap, the plug cap is installed at the top of the valve chamber, one end of the plug rod is connected to the plug, the other end of the plug rod passes through the plug cap and extends to the outside, and the plug cap is used to press the plug.

[0018] In one embodiment, the first spool further includes a sealing ring, the sealing ring is sleeved on one end of the plug close to the plug rod, and the sealing ring abuts against the inner wall surface of the valve chamber.

[0019] In one embodiment, the valve further includes a handle, the handle is connected to the plug rod, and the plug rod rotates synchronously with the handle.

[0020] In one embodiment, the valve further includes a valve seat, the valve seat is installed on the side wall of the transformer oil tank, the valve seat is provided with a mounting hole, one end of the valve body away from the second spool is installed in the mounting hole, and the liquid inlet is communicated with the inside of the transformer oil tank.

[0021] In one embodiment, the valve further includes a connecting seat which is installed on the outer surface of the valve body. The connecting seat is provided with a third liquid outlet channel which communicates with the first liquid outlet channel.

[0022] The present utility model also provides a transformer which includes the valve as described in any one of the above embodiments. The transformer further includes a transformer oil tank and an oil on-line monitoring device. The oil on-line monitoring device includes an inlet pipe, an oil monitoring device and a return pipe. The number of the valves is two, and the two valves are respectively installed on the side wall of the transformer oil tank. One end of the inlet pipe communicates with one of the valves, and the other end communicates with the oil monitoring device;

[0023] One end of the return pipe communicates with the other valve, and the other end communicates with the oil monitoring device.

[0024] In the technical solution provided by the present utility model, the valve includes a valve body, a first valve core, a ball and a second valve core. Among them, a main channel, a first liquid outlet channel, a receiving cavity and a valve core cavity are arranged inside the valve body. The main channel includes a liquid inlet and a liquid outlet. The first liquid outlet channel communicates with the main channel and the communicating part is located between the liquid inlet and the liquid outlet; the receiving cavity communicates with the liquid outlet, and the valve core cavity communicates with the receiving cavity; the first valve core is installed on the flow path between the liquid inlet and the first liquid outlet channel and is used to open or close the main channel; the ball is arranged in the receiving cavity and can seal the liquid outlet; one end of the second valve core is installed in the valve core cavity. A second liquid outlet channel is arranged inside the second valve core, and a side hole is opened at the end of the second valve core installed in the valve core cavity. The side hole communicates with the second liquid outlet channel; the second valve core can extend or retract into the valve core cavity to loosen or press the ball. During installation, only the original manual oil extraction valve for manual oil extraction needs to be removed, and the valve in the present utility model is installed at the removed position, and then the oil on-line monitoring device is communicated with the first liquid outlet channel. Through this setting, when only the oil on-line monitoring device is needed to test the oil sample, the first valve core is opened and the second valve core presses the ball, and the oil liquid only enters the first liquid outlet channel through the main channel and finally flows into the oil on-line monitoring device; when manual oil extraction and testing are needed, the second valve core extends out of the valve core cavity to loosen the ball, so that the oil liquid can enter the valve core cavity through the receiving cavity and flow into the second liquid outlet channel through the side hole, and finally the oil sample is obtained by the worker. Through the technical solution provided by the present utility model, when installing the oil on-line monitoring device, there is no need to additionally open a special hole on the transformer oil tank and perform a series of complex operations, reducing the installation process and cost of the oil on-line monitoring device. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or 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 drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0026] Figure 1 Schematic cross-sectional structure diagram of an embodiment of the valve provided by the present invention;

[0027] Figure 2 For Figure 1 exploded structure diagram;

[0028] Figure 3 For Figure 1 enlarged structure diagram at position A in

[0029] Figure 4 Schematic structure diagram of a transformer provided by the related art;

[0030] Figure 5 Schematic structure diagram of an embodiment of the transformer provided by the present invention.

[0031] Explanation of reference numerals in the drawings:

[0032] 1000, transformer;

[0033] 100, valve; 1, valve body; 11, main channel; 111, liquid inlet; 112, liquid outlet; 12, first liquid outlet channel; 13, accommodation cavity; 14, spool cavity; 15, valve chamber; 2, first spool; 21, plug; 211, through hole; 22, rotating rod; 23, sealing ring; 3, second spool; 31, second liquid outlet channel; 32, side hole; 4, ball; 5, protective sleeve; 6, valve cover; 7, plug cap; 8, handle; 9, valve seat; 91, mounting hole; 10, connecting seat; 101, third liquid outlet channel;

[0034] 200, transformer oil tank;

[0035] 300, on-line oil liquid monitoring device; 310, oil inlet pipe; 320, oil return pipe; 330, oil liquid monitoring device;

[0036] 400, manual oil sampling valve;

[0037] 500, automatic oil sampling valve.

[0038] The realization, functional features and advantages of the objectives of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0040] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0042] As an insulating medium, the transformer oil in an oil-immersed transformer directly affects the insulation performance of the transformer. During the use of the transformer, it is necessary to regularly take samples of the transformer oil for testing to understand the aging situation of the transformer oil and take maintenance measures in a timely manner. The change of the characteristic gases in the transformer oil is a sign of equipment overheating or equipment failure. Therefore, by regularly monitoring the transformer oil, problems can be discovered and handled in a timely manner to avoid damage to the transformer.

[0043] When sampling and testing transformer oil, it is usually carried out by manual oil sampling for laboratory analysis or by using an on-line oil monitoring device to automatically sample and analyze the oil. When using manual oil sampling for laboratory analysis, it is necessary to open the manual oil sampling valve, take out the sample and send it to the laboratory for analysis; when using an on-line oil monitoring device to automatically sample and analyze the oil, only need to keep the corresponding automatic oil sampling valve of the on-line oil monitoring device in the normally open state, and the on-line oil monitoring device can regularly automatically sample and automatically conduct analysis. The two analysis results can be compared and analyzed with each other to ensure the accuracy of the analysis results. Since the manual oil sampling valve needs to be in the normally closed state, while the automatic oil sampling valve needs to be in the normally open state, the oil sampling valves required for the two oil sampling methods cannot be used interchangeably.

[0044] According to the applicant's research findings, with the gradual standardization of the power industry, the detection and maintenance of transformers usually require that the transformer should have both manual oil sampling for laboratory analysis and oil sampling and analysis by an on-line oil monitoring device. For some transformers that have been in operation, the need for installing an on-line oil monitoring device later was not considered during the construction of the transformer, and usually only a manual oil sampling valve is provided. Directly installing an on-line oil monitoring device will occupy the manual oil sampling valve. According to the requirements of the maintenance personnel, the manual oil sampling valve must be retained for daily sampling and analysis. The analysis results need to be compared with the monitoring data of the on-line oil monitoring device, and the on-line oil monitoring device is calibrated according to the comparison results to ensure the accuracy of the monitoring results of the on-line oil monitoring device. When installing an on-line oil monitoring device later, it is necessary to perform operations such as powering off the operating transformer, lifting the fuel tank, drilling holes in the fuel tank, welding valve pipelines, and cleaning the fuel tank. The operation process is relatively cumbersome and will incur a large labor cost. At the same time, if the transformer is used to supply power to the production line, the production line needs to be shut down for a long time, resulting in a large additional cost.

[0045] In view of this, the present utility model proposes a valve to solve the above technical problems.

[0046] Please refer to Figure 1 And Figure 2, in an embodiment of the present utility model, the valve 100 includes a valve body 1, a first valve core 2, a ball 4 and a second valve core 3. Among them, a main channel 11, a first liquid outlet channel 12, a receiving cavity 13 and a valve core cavity 14 are provided inside the valve body 1. The main channel 11 includes a liquid inlet 111 and a liquid outlet 112. The first liquid outlet channel 12 is communicated with the main channel 11, and the communication position is located between the liquid inlet 111 and the liquid outlet 112; the receiving cavity 13 is communicated with the liquid outlet 112, and the valve core cavity 14 is communicated with the receiving cavity 13; the first valve core 2 is installed on the flow path between the liquid inlet 111 and the first liquid outlet channel 12 for opening or closing the main channel 11; the ball 4 is arranged in the receiving cavity 13 and can seal the liquid outlet 112; one end of the second valve core 3 is installed in the valve core cavity 14. A second liquid outlet channel 31 is arranged inside the second valve core 3, and a side hole 32 is opened at one end of the second valve core 3 installed in the valve core cavity 14, and the side hole 32 is communicated with the second liquid outlet channel 31; the second valve core 3 can be retracted into the valve core cavity 14 to press the ball 4; the second valve core 3 can extend out of the valve core cavity 14 to release the ball 4.

[0047] Specifically, the inlet 111 to the outlet 112 is defined as the first direction. Along the first direction, the first valve core 2, the ball 4, and the second valve core 3 are respectively arranged in the valve body 1. The first valve core 2 includes one of a plug 21 and a ball plug. The first valve core 2 has an open state and a closed state. When the first valve core 2 is in the closed state, the main channel 11 is cut off, and the oil cannot flow through the main channel 11 into the first outlet channel 12. By rotating the first valve core 2, the first valve core 2 enters the open state. At this time, the main channel 11 is connected, and the oil can flow through the main channel 11 into the first outlet channel 12. At the outlet of the first outlet channel 12, it is connected to the inlet pipe 310 or the return pipe 320 of the on-line oil monitoring device 300, so that the transformer oil can enter the on-line oil monitoring device 300 or be sent back to the transformer oil tank 200 by the on-line oil monitoring device 300. Outside the outlet 112 of the main channel 11, the valve body 1 forms a receiving cavity 13. The receiving cavity 13 is arranged in a hemispherical shape for receiving the ball 4. The diameter of the receiving cavity 13 is larger than the diameter of the ball 4, and the diameter of the ball 4 is larger than the diameter of the outlet 112 so that the ball 4 can close the outlet 112. The receiving cavity 13 and the valve core cavity 14 are arranged in sequence along the first direction. The second valve core 3 is installed in the valve core cavity 14 and is connected to the valve body 1 by a thread. The second valve core 3 can be screwed into or out of the valve core cavity 14. By rotating the second valve core 3, the length of its extension into the valve core cavity 14 can be adjusted. When the second valve core 3 is tightened, the second valve core 3 abuts against the ball 4 and presses the ball 4 against the outlet 112, so that the transformer oil cannot flow through the outlet 112 into the receiving cavity 13. At this time, the transformer oil can only flow into the first outlet channel 12 for the on-line oil monitoring device 300 to take samples for testing. When the second valve core 3 is rotated outward, the ball 4 is relaxed, and the liquid pressure in the transformer oil tank 200 can push the ball 4 away from the outlet 112 along the first direction. At this time, the transformer oil enters the receiving cavity 13 and then enters the valve core cavity 14. The side hole 32 opened on the second valve core 3 is arranged in the valve core cavity 14, and the transformer oil can enter the second outlet channel 31 through the side hole 32 and finally flow out of the valve 100 for manual oil sampling. More specifically, the diameter of the part of the second valve core 3 where the side hole 32 is opened is smaller than other parts, so that a gap for the transformer oil to pass through is formed between this part and the inner wall of the valve core cavity 14 to ensure that the transformer oil can flow smoothly into the side hole 32. When installing this valve 100 on the side wall of the transformer oil tank 200, only the valve body 1 of the original manual oil sampling valve 400 for manual oil sampling needs to be removed and the valve seat 9 is retained, and the valve 100 provided in this embodiment is installed on the original valve seat 9 to complete the installation. The whole process does not require a long power outage and does not require emptying the transformer oil tank 200. It is convenient, fast, and the process is simple. By installing this valve 100 on the side wall of the transformer oil tank 200, this valve 100 can meet the requirements of both manual oil sampling and automatic oil sampling of the on-line oil monitoring device 300 at the same time.

[0048] In the technical solution provided by the present utility model, the valve 100 includes a valve body 1, a first valve core 2, a ball 4, and a second valve core 3. Among them, a main channel 11, a first liquid outlet channel 12, a receiving cavity 13, and a valve core cavity 14 are arranged inside the valve body 1. The main channel 11 includes a liquid inlet 111 and a liquid outlet 112. The first liquid outlet channel 12 is communicated with the main channel 11, and the communication position is between the liquid inlet 111 and the liquid outlet 112; the receiving cavity 13 is communicated with the liquid outlet 112, and the valve core cavity 14 is communicated with the receiving cavity 13; the first valve core 2 is installed on the flow path between the liquid inlet 111 and the first liquid outlet channel 12, and is used to open or close the main channel 11; the ball 4 is arranged in the receiving cavity 13 and can close the liquid outlet 112; one end of the second valve core 3 is installed in the valve core cavity 14. A second liquid outlet channel 31 is arranged inside the second valve core 3, and a side hole 32 is opened at one end of the second valve core 3 installed in the valve core cavity 14. The side hole 32 is communicated with the second liquid outlet channel 31; the second valve core 3 can extend or retract into the valve core cavity 14 to loosen or press the ball 4. During installation, only the original manual oil extraction valve 400 for manual oil extraction needs to be removed, and the valve 100 in the present utility model is installed at the removed position. Then, the oil liquid on-line monitoring device 300 is communicated with the first liquid outlet channel 12. Through this setting, when only the oil liquid on-line monitoring device 300 is needed to test the oil sample, the first valve core 2 is opened, and the second valve core 3 presses the ball 4, and the oil liquid only enters the first liquid outlet channel 12 through the main channel 11 and finally flows into the oil liquid on-line monitoring device 300; when manual oil extraction for testing is needed, the second valve core 3 extends out of the valve core cavity 14 to loosen the ball 4, so that the oil liquid can enter the valve core cavity 14 through the receiving cavity 13 and flow into the second liquid outlet channel 31 through the side hole 32, and finally the oil sample is obtained by the worker. Through the technical solution provided by the present utility model, when installing the oil liquid on-line monitoring device 300, there is no need to additionally open a special hole on the transformer oil tank 200 and perform a series of complex operations, reducing the installation process and cost of the oil liquid on-line monitoring device 300.

[0049] Further, in an embodiment of the present utility model, the valve 100 further includes a protective sleeve 5. The protective sleeve 5 is sleeved on one end of the second valve core 3 away from the ball 4 and is used to close the second liquid outlet channel 31. Please refer to Figure 1 And Figure 2 , the cross-section of the protective sleeve 5 is in the shape of "concave", its opening faces the second valve core 3 and is sleeved on one end of the second valve core 3, and is used to protect the second liquid outlet channel 31 to prevent sundries or pollutants from entering the second liquid outlet channel 31 and causing inaccurate test results of the transformer oil. When manual oil extraction is needed, the protective sleeve 5 is removed to communicate the second liquid outlet channel 31 with the outside. After the manual oil extraction is completed, the protective sleeve 5 is sleeved on the second valve core 3 again to ensure that the second liquid outlet channel 31 is completely closed.

[0050] Please refer to Figure 1, in an embodiment of the present utility model, the valve 100 further includes a valve cover 6. The valve cover 6 is disposed at one end of the valve body 1 where the second valve element 3 is installed, and the valve cover 6 covers the outside of the second valve element 3. Specifically, the valve cover 6 is connected to the valve body 1 by threads for easy disassembly during manual oil extraction. The valve cover 6 entirely covers the outside of the second valve element 3 and there is a gap between the valve cover 6 and the second valve element 3 to prevent the second valve element 3 from rotating synchronously when the valve cover 6 is turned, resulting in premature leakage of transformer oil. Through this arrangement, the part of the second valve element 3 exposed outside the valve body 1 is protected, preventing the second valve element 3 from being severely corroded due to the external environment and reducing its service life.

[0051] In an embodiment of the present utility model, the valve body 1 is further provided with a valve chamber 15 communicating with the outside. The valve chamber 15 communicates with the main channel 11 and is disposed between the liquid inlet 111 and the first liquid outlet channel 12. The first valve element 2 includes a plug 21 and a plug rod 22 fixedly connected to the plug 21. The plug 21 is rotatably disposed in the valve chamber 15. The plug 21 is provided with a through hole 211, and the plug rod 22 can drive the plug 21 to rotate so that the through hole 211 communicates with or disconnects from the main channel 11. Please refer to Figure 1 and Figure 2 , in this embodiment, the plug 21 is used as the switch to control the main channel 11. The valve chamber 15 is used to install the plug 21. The overall shape of the plug 21 is cylindrical, and the shape of the valve chamber 15 is substantially the same as that of the plug 21. A through hole 211 is drilled on the side surface of the cylindrical plug 21. The shape of the through hole 211 includes a round hole and an oblong hole. In this embodiment, the shape of the through hole 211 is circular, and its axis coincides with the axis of the main channel 11. The plug 21 includes an open state and a closed state. When in the open state, both ends of the through hole 211 in the plug 21 communicate with the main channel 11, and the transformer oil can flow into the first liquid outlet channel 12 through the main channel 11 and the through hole 211. After the plug 21 is rotated by a certain angle, usually 90°, it enters the closed state. At this time, both ends of the through hole 211 are disconnected from the main channel 11, and the transformer oil can only enter the part of the main channel 11 between the liquid inlet 111 and the plug 21 and cannot flow out of the valve body 1. One end of the plug rod 22 is fixedly connected to the plug 21, and the other end extends out of the valve chamber 15 and extends to the outside. When the plug rod 22 rotates, it can drive the plug 21 to rotate so that the plug 21 switches between the open state and the closed state. In other embodiments, the plug 21 can be spherical. Correspondingly, the valve chamber 15 is also set to be spherical. A through hole 211 is opened on the spherical plug 21. By setting the plug 21 to be spherical, the contact area between the surface of the plug 21 and the valve body 1 can be increased, improving the sealing effect.

[0052] Further, in an embodiment of the present utility model, the valve 100 further includes a plug cap 7. The plug cap 7 is installed on the top of the valve chamber 15. One end of the rotating rod 22 is connected to the plug 21, and the other end of the rotating rod 22 passes through the plug cap 7 and extends to the outside. The plug cap 7 is used to press the plug 21. Specifically, please refer to Figure 1 and Figure 2 , the valve cap is connected to the valve body 1 by threads or screws. By setting the valve cap on the top of the valve chamber 15, the valve cap can press the plug 21 to prevent the plug 21 from loosening and improve the sealing performance. A cylindrical hole is provided inside the valve cap for the rotating rod 22 to pass through. A sealing layer is provided between the valve cap and the plug 21, which is filled with a sealing material. On the one hand, it can prevent the valve cap from squeezing and damaging the plug 21, and on the other hand, it can improve the sealing performance of the valve 100.

[0053] In addition, please refer to Figure 2 and Figure 3 , in an embodiment of the present utility model, the first valve core 2 further includes a sealing ring 23. The sealing ring 23 is sleeved on one end of the plug 21 close to the rotating rod 22, and the sealing ring 23 abuts against the inner wall surface of the valve chamber 15. The sealing ring 23 is made of a flexible material, including one of rubber, modified rubber, polytetrafluoroethylene, nylon and other materials. By sleeving the sealing ring 23 on the plug 21, a better sealing effect is achieved between the top of the plug 21 and the inner wall of the valve chamber 15, preventing transformer oil from leaking out through the gap between the valve chamber 15 and the plug 21. Combined with the sealing layer between the valve cap and the plug 21 in the previous embodiment, the sealing performance of the valve 100 is guaranteed.

[0054] In an embodiment of the present utility model, the valve 100 further includes a handle 8. The handle 8 is connected to the rotating rod 22, and the rotating rod 22 rotates synchronously with the handle 8. Please refer to Figure 1 and Figure 2 , the handle 8 is arranged on the top of the rotating rod 22. The top of the rotating rod 22 is a rectangular rod or a hexagonal rod. Corresponding polygonal holes are provided in the handle 8 to cooperate with the top of the rotating rod 22, so that the handle 8 can transmit torque to the rotating rod 22 to drive the rotating rod 22 to rotate. The handle 8 is pressed on the top of the rotating rod 22 by a nut. When the handle 8 needs to be replaced, only the nut needs to be removed to replace the handle 8.

[0055] In an embodiment of the present utility model, the valve 100 further includes a valve seat 9. The valve seat 9 is installed on the side wall of the transformer oil tank 200. The valve seat 9 is provided with an installation hole 91. One end of the valve body 1 away from the second valve core 3 is installed in the installation hole 91, and the liquid inlet 111 is communicated with the inside of the transformer oil tank 200. Please refer to Figure 1 and Figure 2, for the convenience of overhaul and replacement of the valve 100, a valve seat 9 is prefabricated and installed on the side wall of the transformer oil tank 200 in advance. The valve seat 9 is provided with threads, and one end of the valve body 1 facing the valve seat 9 is correspondingly provided with threads, and the valve body 1 can be installed on the valve seat 9 through thread fit. During installation, usually, the rest of the valve 100 except the valve seat 9 needs to be assembled and then installed on the valve seat 9 as a whole. The installation process is convenient, fast, and easy to operate. To save costs and reduce the installation process, the valve seat 9 can be the valve seat 9 reserved on the side wall of the transformer oil tank 200 by the manual oil extraction valve 400. During installation, only the rest of the manual oil extraction valve 400 except the valve seat 9 needs to be removed, and then the rest of the valve 100 in this embodiment except the valve seat 9 can be installed on the valve seat 9. Please refer to Figure 1 , the cross-section of the installation hole 91 of the valve seat 9 is stepped. The installation hole 91 specifically includes a circular hole with a larger diameter and a cylindrical hole with a smaller diameter that are coaxially arranged. Correspondingly, one end of the valve body 1 close to the valve seat 9 is arranged in cooperation with the cylindrical hole with a smaller diameter, so that the valve body 1 can be installed on the valve seat 9. An anti-seepage layer is installed at the edge position of the cylindrical hole with a larger diameter. The anti-seepage layer is arranged between the valve seat 9 and the valve body 1 to prevent the transformer oil from leaking. In addition, after being compressed, the anti-seepage layer will generate prestress, and after the valve seat 9 and the valve body 1 are installed, it will continuously apply pressure to the valve seat 9 and the valve body 1, making the installation between the valve seat 9 and the valve body 1 more stable.

[0056] In an embodiment of the present invention, the valve 100 further includes a connection seat 10. The connection seat 10 is installed on the outer surface of the valve body 1. The connection seat 10 is provided with a third liquid outlet channel 101, and the third liquid outlet channel 101 is communicated with the first liquid outlet channel 12. Please refer to Figure 1 , the connection seat 10 is used to connect with the inlet oil pipe 310 or the return oil pipe 320 of the oil liquid on-line monitoring device 300. If the connection seat 10 is not provided, the inlet oil pipe 310 or the return oil pipe 320 of the oil liquid on-line monitoring device 300 can be directly welded to the surface of the valve body 1, and the first liquid outlet channel 12 is communicated with the inlet oil pipe 310 or the return oil pipe 320. In this embodiment, by arranging an installation seat outside the valve body 1, the inlet oil pipe 310 or the return oil pipe 320 can be detachably installed on the valve 100, and the specific shape of the connection seat 10 can be designed according to the shape of the inlet oil pipe 310 or the return oil pipe 320 to ensure a tight connection between the valve body 1 and the inlet oil pipe 310 or the return oil pipe 320.

[0057] The present invention also proposes a transformer 1000. The transformer 1000 includes the valve 100 described in any one of the above embodiments. The specific structure of the valve 100 refers to the above embodiments. Since this transformer 1000 adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0058] In this embodiment, the transformer 1000 further includes a transformer oil tank 200 and an on-line oil monitoring device 300. The on-line oil monitoring device includes an inlet pipe 310, an oil monitoring device 330, and a return pipe 320. The number of valves 100 is two, and the two valves 100 are respectively installed on the side wall of the transformer oil tank 200. One end of the inlet pipe 310 is communicated with one of the valves 100, and the other end is communicated with the oil monitoring device 330; one end of the return pipe 320 is communicated with the other valve 100, and the other end is communicated with the oil monitoring device 330.

[0059] Please refer to Figure 4 , when the valve 100 provided in the above embodiment is not adopted, when installing the on-line oil monitoring device 300 in the transformer 1000, it is necessary to drill two more holes on the side wall of the transformer oil tank 200 and install automatic oil sampling valves 500. The two automatic oil sampling valves 500 are respectively connected to the inlet pipe 310 and the return pipe 320, while the manual oil sampling valve 400 is still retained. This installation method increases the number of holes drilled on the transformer oil tank 200 and increases the possibility of leakage of the transformer oil tank 200. In addition, there is a gap between the manual oil sampling valve 400 and the automatic oil sampling valve 500, which may cause a large deviation in the test results of the oil samples obtained at the two places.

[0060] By installing the valve 100 in the above embodiment on the transformer oil tank 200, the above problems can be completely solved. Please refer to Figure 5 , two holes for manual oil sampling and testing are usually reserved when the transformer 1000 is built, and the valve 100 provided in the above embodiment can be directly installed in the two reserved holes, and at the same time, it can meet the needs of manual oil sampling and oil sampling of the on-line oil monitoring device 300. When installing the on-line oil monitoring device 300, retain the valve seat 9 of the manual oil sampling valve 400, install the structure of the valve 100 provided in the above embodiment except the valve seat 9 on the valve seat 9, and then install the inlet pipe 310 and the return pipe 320 on the two valves 100 respectively, and then it can be used normally. Through this setting, there is no need to open holes on the tank wall of the transformer oil tank 200 again, reducing the risk of leakage of the transformer oil tank 200. At the same time, the sampling points for manual oil sampling and the sampling points of the on-line oil monitoring device 300 are the same, improving the credibility of the comparison and analysis results of the two testing methods.

[0061] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A valve, characterized in that, Comprising: A valve body, inside which there are provided a main channel, a first liquid outlet channel, a receiving cavity and a spool cavity. The main channel includes a liquid inlet and a liquid outlet. The first liquid outlet channel communicates with the main channel, and the communication position is between the liquid inlet and the liquid outlet; The receiving cavity communicates with the liquid outlet, and the spool cavity communicates with the receiving cavity; A first spool, which is installed on the flow path between the liquid inlet and the first liquid outlet channel and is used to open or close the main channel; A ball, which is arranged in the receiving cavity and can seal the liquid outlet; A second spool, one end of which is installed in the spool cavity. A second liquid outlet channel is provided inside the second spool, and a side hole is provided at the end of the second spool installed in the spool cavity. The side hole communicates with the second liquid outlet channel; The second spool can retract into the spool cavity to press the ball; The second spool can extend out of the spool cavity to relax the ball.

2. The valve according to claim 1, characterized in that, The valve further includes a protective sleeve, which is sleeved on the end of the second spool away from the ball and is used to seal the second liquid outlet channel.

3. The valve according to claim 1, characterized in that, The valve further includes a valve cover, which is arranged at the end of the valve body where the second spool is installed, and the valve cover covers the outside of the second spool.

4. The valve according to claim 1, characterized in that, The valve body is further provided with a valve chamber communicating with the outside. The valve chamber communicates with the main channel and is arranged between the liquid inlet and the first liquid outlet channel; The first spool includes a plug and a plug rod fixedly connected to the plug. The plug is rotatably arranged in the valve chamber. The plug is provided with a through hole, and the plug rod can drive the plug to rotate so that the through hole communicates with or disconnects from the main channel.

5. The valve according to claim 4, wherein The valve further includes a plug cap, which is installed on the top of the valve chamber. One end of the plug rod is connected to the plug, and the other end of the plug rod passes through the plug cap and extends to the outside. The plug cap is used to press the plug.

6. The valve according to claim 4, characterized in that, The first spool further includes a sealing ring, which is sleeved on the end of the plug close to the plug rod, and the sealing ring abuts against the inner wall surface of the valve chamber.

7. The valve according to claim 4, wherein The valve further includes a handle, which is connected to the plug rod, and the plug rod rotates synchronously with the handle.

8. The valve according to claim 1, characterized in that, The valve further includes a valve seat, which is installed on the side wall of the transformer oil tank. The valve seat is provided with a mounting hole, and the end of the valve body away from the second spool is installed in the mounting hole. The liquid inlet communicates with the inside of the transformer oil tank.

9. The valve according to claim 1, characterized in that, The valve further includes a connecting seat, which is installed on the outer surface of the valve body. The connecting seat is provided with a third liquid outlet channel, and the third liquid outlet channel communicates with the first liquid outlet channel.

10. A transformer, characterized in that, Comprising the valve according to any one of claims 1 to 9, the transformer further includes a transformer oil tank and an on-line oil liquid monitoring device. The on-line oil liquid monitoring device includes an oil inlet pipe, an oil liquid monitoring device and an oil return pipe. The number of the valves is two, and the two valves are respectively installed on the side wall of the transformer oil tank. One end of the oil inlet pipe communicates with one of the valves, and the other end communicates with the oil liquid monitoring device; One end of the return oil pipe communicates with the other valve, and the other end communicates with the oil monitoring device.

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