Transformer oil sampling valve and transformer oil on-line detection device

Abstract

The invention belongs to the technical field of transformer detection, and particularly relates to a transformer oil sampling valve and a transformer oil online detection device, and the transformer oil sampling valve comprises a valve body, a plugging ball, a valve rod, a first sealing element and a second sealing element; the valve body is provided with a containing cavity, an oil inlet hole and a first penetrating hole. The valve rod is arranged in the first penetrating hole in a penetrating mode, and the blocking ball is located between the oil inlet hole and the valve rod. The first sealing piece is clamped between the peripheral face of the valve rod and the inner wall of the containing cavity and divides the containing cavity into an oil inlet space and a containing space, and the valve rod is provided with a drainage channel for draining oil in the oil inlet space out of the valve body; the second sealing piece is arranged outside the valve rod in a sleeving mode and used for sealing the gap between the first penetrating hole and the valve rod, so that the first sealing piece and the second sealing piece can form two sealing defense lines, and the sealing reliability of the transformer oil sampling valve is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of transformer detection, and particularly relates to a transformer oil sampling valve and a transformer oil online detection device. BACKGROUND

[0002] A large power transformer is a core equipment of a power system, and its safe operation is related to power supply stability. When a transformer internal fault occurs, characteristic gases are generated from insulating oil, and the fault can be diagnosed by analyzing the gases. Therefore, a sampling valve is arranged to guide the insulating oil to a transformer oil online monitoring device, so that the device can detect the equipment hidden danger as early as possible.

[0003] After the insulating oil is introduced into the transformer oil online monitoring device, the transformer oil online monitoring device and its peripheral pipeline become part of the transformer insulating oil sealing boundary. If the sampling valve leaks, the oil level of the insulating oil in the transformer will decrease, and in severe cases, the transformer will be shut down due to the excessively low oil level. In the worst case, during the working stage of the transformer oil online monitoring device for extracting the oil sample, a negative pressure area will appear at the leakage point, which will cause external air or moisture to enter the insulating oil sealing boundary under the negative pressure, and seriously affect the safe and reliable operation of the transformer. Therefore, a sampling valve with good sealing performance is very important. SUMMARY

[0004] The purpose of the embodiment of the application is to provide a transformer oil sampling valve and a transformer oil online detection device, which can improve the sealing performance of the transformer oil sampling valve.

[0005] The technical solution adopted by the embodiment of the application is as follows: In a first aspect, a transformer oil sampling valve is provided, which includes a valve body, a plugging bead, a valve rod, a first sealing member and a second sealing member. The valve body has a receiving cavity, an oil inlet hole and a first through hole which are in communication with the receiving cavity. The plugging bead is located in the receiving cavity. The valve rod is arranged in the first through hole, and the plugging bead is located between the oil inlet hole and the valve rod. The valve rod is used to push the plugging bead to seal the oil inlet hole. The first sealing member is located in the receiving cavity, and is clamped between the outer circumferential surface of the valve rod and the inner wall of the receiving cavity, so as to divide the receiving cavity into an oil inlet space and a receiving space. The oil inlet space is located between the first sealing member and the oil inlet hole, and the receiving space is located between the first sealing member and the first through hole. The valve rod has a drainage channel for guiding the oil in the oil inlet space to the outside of the valve body, and the valve rod is arranged in the receiving space. The second sealing member is arranged on the outer circumferential surface of the valve rod and is used to seal the gap between the first through hole and the valve rod.

[0006] Optionally, at least part of the outer circumferential surface of the valve rod between the first sealing member and the first through hole is in surrounding connection with the inner wall of the receiving space to form a buffer cavity.

[0007] Optionally, the transformer oil sampling valve further comprises a pressing member, the valve body is provided with a partition plate, the partition plate is provided with a first through hole, the first through hole has a stepped surface, the partition plate divides the internal space of the valve body into a receiving cavity and a fixing cavity, the pressing member is fixed in the fixing cavity and presses the second sealing member against the stepped surface; the pressing member is provided with a second through hole, the valve rod passes through the second through hole.

[0008] Optionally, the first through hole has a first inclined surface, along the direction in which the first sealing member points to the second sealing member, the first inclined surface gradually moves away from the axis of the valve rod from the stepped surface, and the second sealing member has a second inclined surface for abutting the first inclined surface.

[0009] Optionally, the transformer oil sampling valve further comprises a third sealing member, the pressing member is a pressing nut, the pressing nut is threadedly connected in the fixing cavity, the pressing nut has a flange, the flange is located on the side of the valve body away from the oil inlet hole, the third sealing member is sleeved on the pressing nut, and the third sealing member is clamped between the flange and the valve body.

[0010] Optionally, the valve rod comprises a first rod segment and a second rod segment connected with each other, the second rod segment passes through the first through hole, the first rod segment is located between the blocking bead and the second rod segment, the first sealing member is sleeved outside the first rod segment, the first rod segment has an external thread, the external thread is located between the first sealing member and the blocking bead, and the first rod segment is threadedly connected with the inner wall of the receiving cavity through the external thread.

[0011] Optionally, the valve body comprises a valve seat and a sealing sleeve, the valve seat has the oil inlet hole, one end of the valve seat is sealingly fixed in the sealing sleeve, the external thread is threadedly connected in the valve seat, and the first sealing member is clamped between the inner wall of the valve seat and the outer circumferential surface of the valve rod; the sealing sleeve has the first through hole.

[0012] Optionally, the valve body comprises a fourth sealing member, the valve seat is threadedly connected in the sealing sleeve, the valve seat has a flange located on the outside of the sealing sleeve, and the fourth sealing member is clamped between the flange and the sealing sleeve.

[0013] Optionally, the valve rod has an oil inlet opening communicated with the drainage channel, and the oil inlet opening is arranged on the outer circumferential side of the valve rod.

[0014] In a second aspect, a transformer oil online detection device is provided, comprising the transformer oil sampling valve and an online detection unit, and the online detection unit is communicated with the drainage channel.

[0015] The transformer oil sampling valve and the transformer oil online detection device provided by the embodiments of the present application have at least one of the following technical effects: in use, the blocking bead does not block the oil inlet hole, the oil enters the oil inlet space from the oil inlet hole, and then flows out of the valve body through the drainage channel, thereby realizing the sampling and drainage of the oil; in this process, the first sealing member is clamped between the outer circumferential surface of the valve rod and the inner wall of the accommodation cavity, the first sealing member can block the oil in the oil inlet space from flowing to the accommodation space through the gap between the outer circumferential surface of the valve rod and the inner wall of the accommodation cavity, and the second sealing member is sleeved on the valve rod and used to seal the gap between the first through hole and the valve rod, the second sealing member can block the oil in the accommodation space from flowing out of the first through hole, the first sealing member and the second sealing member form two sealing lines, the two sealing lines form redundant cooperation, the sealing reliability of the transformer oil sampling valve is improved, which is beneficial to reducing the leakage of the oil and improving the operation stability of the transformer; the cooperation of the drainage channel in the valve rod and the two sealing lines can also effectively improve the sealing reliability of the sampling valve; the oil enters the oil inlet space with a large space from the oil inlet hole, the oil is buffered, the pressure of the oil is reduced, the impact pressure of the oil on the first sealing member is small, the risk of sealing failure of the first sealing member is also reduced, and the sealing reliability of the transformer oil sampling valve is also improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The structural schematic diagram of the transformer and the transformer oil online detection device provided by some embodiments of the present application.

[0018] Figure 2 The structural schematic diagram of the oil inlet sampling valve (transformer oil sampling valve) and the first switch valve provided by some embodiments of the present application.

[0019] Figure 3 For Figure 2 The structural schematic diagram of the transformer oil sampling valve.

[0020] Figure 4 For Figure 3 The sectional view along line A-A in the above figure.

[0021] Figure 5 For Figure 3 The exploded schematic diagram of the transformer oil sampling valve.

[0022] Figure 6 is a structural schematic view of the second sealing element in Figure 5

[0023] Figure 7 is a structural schematic view of the third sealing element and the compression nut in Figure 5

[0024] Figure 8 is a structural schematic view of the valve stem in Figure 5

[0025] In the drawings, reference numerals: 100, transformer oil on-line detection device; 10, transformer oil sampling valve; 101, oil inlet sampling valve; 102, oil outlet sampling valve; 11, valve body; 1101, receiving cavity; 11011, oil inlet space; 11012, receiving space; 11013, buffer cavity; 1102, fixed cavity; 111, valve seat; 1111, oil inlet hole; 1112, flange; 112, sealing sleeve; 1121, partition; 11211, first through hole; 11212, stepped surface; 11213, first inclined surface; 113, fourth sealing element; 12, sealing bead; 13, valve stem; 131, first stem segment; 1311, first receiving groove; 132, second stem segment; 1321, clamping structure; 1301, drainage channel; 13011, oil inlet; 14, first sealing element; 15, second sealing element; 151, second inclined surface; 16, compression element; 161, compression nut; 1611, second through hole; 1612, flange; 1613, second receiving groove; 17, third sealing element; 20, on-line detection unit; 21, degassing tank; 211, stirring device; 212, pressure sensor; 22, oil pump; 23, gas pump; 24, vacuum pump; 25, gas analysis device; 26, first photoelectric liquid level sensor; 27, second photoelectric liquid level sensor; 28, first on-off valve; 29, second on-off valve; 30, third on-off valve; 31, fourth on-off valve; 32, fifth on-off valve; 33, nozzle; 200, transformer. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] ​​​In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include at least one of that feature.

[0028] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this application, it should be understood that the terms "inner", "outer", "side", "upper", "bottom", "front", "rear", etc., indicating the orientation or positional relationship are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] In the description of this application, it should be noted that the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0033] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0034] Large power transformer uses insulating oil as core insulating medium. In the operation process, the insulating oil and the solid insulating material (such as paper, paperboard, etc.) therein are susceptible to the combined action of electricity, heat, oxidation and local arc and other factors, and are oxidized and cracked to generate low molecular gas. If there is a latent overheat or discharge fault inside the transformer, the generation rate of the gas will be further accelerated. With the slow development of the fault, the gas bubbles formed by cracking will gradually dissolve in the oil through convection and diffusion. The composition and content of the dissolved gas in the oil can directly reflect the degree of transformer insulation aging or internal fault condition to a certain extent.

[0035] Based on the above characteristics, the online monitoring of the dissolved gas in the transformer oil can realize the continuous monitoring of the operation state of the transformer, which is not only conducive to the early discovery of fault signs, but also has a significant effect on the discrimination of sudden faults, thereby providing a key guarantee for the safe and reliable operation of the transformer.

[0036] To ensure the effective implementation of the online monitoring function, the transformer oil online monitoring device needs to be connected with the transformer body to form a circulating channel with one inlet and one outlet. Meanwhile, to improve the accuracy and reaction sensitivity of the detection results of the device, the oil inlet sampling valve and the oil outlet sampling valve need to be arranged at different positions, and the two valves should not be at the same height.

[0037] After the insulating oil is introduced into the transformer oil online monitoring device, the transformer oil online monitoring device and its peripheral pipeline will become part of the sealing boundary of the transformer insulating oil. If the sampling valve leaks, the oil level of the insulating oil in the transformer will decrease, and in severe cases, the transformer will be shut down due to the excessively low oil level. In the worst case, during the working stage of the transformer oil online monitoring device for extracting the oil sample, a negative pressure area will appear at the leakage point, which will cause external air or moisture to enter the insulating oil sealing boundary under the action of negative pressure, thereby seriously affecting the safe and reliable operation of the transformer. Therefore, a sampling valve with good sealing performance is crucial.

[0038] Based on this, the embodiment of the present application provides a transformer oil sampling valve, which is provided with a first sealing member and a second sealing member, forming two sealing defense lines, improving the sealing reliability of the transformer oil sampling valve, and being conducive to reducing the leakage of oil and improving the operation stability of the transformer.

[0039] The transformer oil sampling valve and the transformer oil online detection device of the embodiment of the present application will be described below in conjunction with Figures 1 to 8 .

[0040] Reference is made to Figure 1As shown, the transformer 200 oil online monitoring device includes an online detection unit 20 and transformer oil sampling valves 10, the number of transformer oil sampling valves 10 is two, one is an oil inlet sampling valve 101, and the other is an oil outlet sampling valve 102; the online detection unit 20 includes a degassing tank 21, an oil pump 22, a gas pump 23, a vacuum pump 24 and a gas analysis device 25, the oil inlet sampling valve 101 and the oil outlet sampling valve 102 are fixed on the transformer 200, the oil inlet sampling valve 101 and the oil outlet sampling valve 102 are communicated with the degassing tank 21 through the oil pump 22, the oil pump 22 draws the oil (i.e. insulating oil) in the transformer 200 into the degassing tank 21 through the oil inlet sampling valve 101, the degassing tank 21 is provided with a stirring device 211, the stirring device 211 stirs the oil to accelerate the outgassing of the gas in the oil, the outgassed gas can be drawn into the gas analysis device 25 by the vacuum pump 24 for detection, and the degassed oil can be returned to the transformer 200 through the oil pump 22 and the oil outlet sampling valve 102. At the same time, the vacuum pump 24 can also perform vacuumization on the degassing tank 21 to facilitate the outgassing of the gas in the oil. The oil pump 22 can be a bidirectional oil pump; for example, a bidirectional gear pump, a bidirectional plunger pump, etc.

[0041] In some embodiments, the gas inlet pipe of the gas pump 23 is located on the upper side of the degassing tank 21, the gas outlet pipe of the gas pump 23 extends into the oil, and the gas pump 23 draws the gas above the oil into the oil, so that the oil appears to be bubbling, thereby accelerating the outgassing of the gas in the oil, and facilitating subsequent detection.

[0042] In some embodiments, the degassing tank 21 is provided with a first photoelectric liquid level sensor 26 and a second photoelectric liquid level sensor 27, and the first photoelectric liquid level sensor 26 and the second photoelectric liquid level sensor 27 are respectively arranged on the upper side and the lower side of the degassing tank 21 to detect the height of the oil in the degassing tank 21.

[0043] In some embodiments, the degassing tank 21 is provided with a pressure sensor 212 to facilitate detection of the gas pressure in the degassing tank 21, thereby facilitating degassing operation.

[0044] In some embodiments, a first switch valve 28 is arranged in the pipeline between the oil inlet sampling valve 101 and the oil pump 22 to control the oil inlet of the degassing tank 21.

[0045] In some embodiments, a second switch valve 29 is arranged in the pipeline between the oil outlet sampling valve 102 and the oil pump 22 to control the oil outlet of the degassing tank 21.

[0046] In some embodiments, the oil inlet pipeline between the degassing tank 21 and the oil pump 22 extends into the degassing tank 21, the end of the oil inlet pipeline is provided with a nozzle 33, and the oil enters the degassing tank 21 in the form of spraying to accelerate the outgassing of the gas in the oil. The oil inlet pipeline is provided with a third switch valve 30 to control the oil inlet of the degassing tank 21.

[0047] In some embodiments, the oil outlet pipeline between the degassing tank 21 and the oil pump 22 extends into the bottom of the degassing tank 21 to facilitate the extraction of most or all of the oil in the degassing tank 21. The oil outlet pipeline is provided with a fourth switch valve 31 to control the oil outlet of the degassing tank 21.

[0048] In some embodiments, the communication pipeline between the vacuum pump 24 and the gas analysis device 25 is provided with a fifth switch valve 32 to control the gas inlet of the gas analysis device 25. The gas analysis device 25 can be a mid-infrared, near-infrared, or single-chamber gas detection device.

[0049] In some embodiments, the first switch valve 28, the second switch valve 29, the third switch valve 30, the fourth switch valve 31, and the fifth switch valve 32 can be solenoid valves, ball valves, or the like.

[0050] In some embodiments, the communication pipeline between the oil inlet sampling valve 101 doors can not be provided with an oil pump 22, and the vacuum pump 24 extracts the gas in the degassing tank 21 to form a negative pressure in the degassing tank 21. The oil in the transformer 200 can be sucked into the degassing tank 21 under the action of the negative pressure to realize the oil inlet of the degassing tank 21.

[0051] Please refer to Figures 2 to 4 In some embodiments, the transformer oil sampling valve 10 includes a valve body 11, a blocking bead 12, a valve rod 13, a first sealing member 14, and a second sealing member 15. The valve body 11 has a receiving cavity 1101, an oil inlet hole 1111, and a first through hole 11211. The blocking bead 12 is located in the receiving cavity 1101. The valve rod 13 is arranged in the first through hole 11211, and the blocking bead 12 is located between the oil inlet hole 1111 and the valve rod 13. The valve rod 13 is used to push the blocking bead 12 to block the oil inlet hole 1111. The first sealing member 14 is located in the receiving cavity 1101. The first sealing member 14 is clamped between the outer circumferential surface of the valve rod 13 and the inner wall of the receiving cavity 1101, and separates the receiving cavity 1101 into an oil inlet space 11011 and a receiving space 11012. The oil inlet space 11011 is located between the first sealing member 14 and the oil inlet hole 1111. The receiving space 11012 is located between the first sealing member 14 and the first through hole 11211. The valve rod 13 has a drainage passage 1301 that drains the oil in the oil inlet space 11011 to the outside of the valve body 11. The valve rod 13 is arranged in the receiving space 11012. The second sealing member 15 is sleeved on the valve rod 13 and is used to seal the gap between the first through hole 11211 and the valve rod 13.

[0052] The valve body 11 can refer to the main part of the transformer oil sampling valve 10, for example, the housing structure of the transformer 200 sampling valve. The valve body 11 is hollow inside to form a receiving cavity 1101 for providing installation space for the valve rod 13, the blocking bead 12 and the first sealing member 14. The oil inlet hole 1111 can be a hole structure for oil to enter the receiving cavity 1101. The first through hole 11211 can be a through hole for the valve rod 13 to pass through. The oil inlet hole 1111, the receiving cavity 1101 and the first through hole 11211 are distributed along the axial direction of the valve rod 13, facilitating the operation of the valve rod 13.

[0053] The blocking bead 12 can refer to a bead for blocking the oil inlet hole 1111. The material of the blocking bead 12 can be metal or plastic, for example, the blocking bead 12 is a steel bead. The diameter of the blocking bead 12 is greater than the hole diameter of the oil inlet hole 1111, so that the oil inlet hole 1111 can be completely blocked. The blocking bead 12 is spherical.

[0054] In some examples, the end of the oil inlet hole 1111 towards the receiving cavity 1101 is a horn-shaped structure. The large size end of the horn-shaped structure faces the receiving cavity 1101. Part of the blocking bead 12 is contained in the horn-shaped structure to position the blocking bead 12 and reduce the risk of the blocking bead 12 separating from the oil inlet hole 1111, facilitating the blocking bead 12 to open and close the oil inlet hole 1111.

[0055] The valve rod 13 can refer to a rod member passing through the valve body 11 and capable of moving relative to the valve body 11. The valve rod 13 passes through the first through hole 11211 and abuts against the blocking bead 12. When the valve rod 13 pushes the blocking bead 12 to abut against the oil inlet hole 1111, the blocking bead 12 blocks the oil inlet hole 1111, and oil cannot flow into the receiving cavity 1101. When the valve rod 13 moves in the opposite direction, a gap is formed between the blocking bead 12 and the oil inlet hole 1111, the oil inlet hole 1111 is opened, and oil can enter the oil inlet space 11011 from the oil inlet hole 1111. The valve rod 13 can be a cylindrical rod.

[0056] In some examples, the end surface of the valve rod 13 near the oil inlet hole 1111 is provided with a groove, and the blocking bead 12 is located in the groove. The groove surface can be a spherical surface, which is matched with the shape of the blocking bead 12 to position the blocking bead 12 and reduce the risk of the blocking bead 12 separating from the oil inlet hole 1111, facilitating the blocking bead 12 to open and close the oil inlet hole 1111.

[0057] The first sealing member 14 can refer to a sealing member for sealing the gap between the outer circumferential surface of the valve rod 13 and the inner wall of the receiving cavity 1101. The first sealing member 14 can be a sealing ring, for example, an O-shaped sealing ring.

[0058] The first sealing member 14 is sleeved on the valve rod 13, is clamped between the valve rod 13 and the inner wall of the accommodating cavity 1101, fills the distance between the outer circumferential surface of the valve rod 13 and the inner wall surface of the accommodating cavity 1101, and divides the accommodating cavity 1101 into two regions that are not communicated, wherein the region provided with the blocking bead 12 is an oil inlet space 11011, and the other region is an accommodating space 11012, the valve rod 13 is arranged in the accommodating space 11012, and the accommodating space 11012 is located between the oil inlet space 11011 and the first through hole 11211.

[0059] In some examples, the accommodating cavity 1101 is a cylindrical space, the oil inlet hole 1111, the oil inlet space 11011, the accommodating space 11012 and the first through hole 11211 are distributed along the axial direction of the cylindrical space, and the valve rod 13 is coaxially arranged with the cylindrical space, so that the components are convenient to design, and the compactness of the structure is improved.

[0060] The valve rod 13 is provided with a channel for the flow of oil, that is, a drainage channel 1301, oil in the oil inlet space 11011 can flow out of the transformer oil sampling valve 10 from the drainage channel 1301, a part of the valve rod 13 is inserted into the valve body 11, and another part is located outside the valve body 11, an oil inlet 13011 of the drainage channel 1301 is arranged in the valve body 11, and an oil outlet of the drainage channel 1301 is arranged outside the valve body 11, so that the oil can be conveniently led out. The drainage channel 1301 can directly penetrate the valve rod 13 along the axial direction of the valve rod 13, so as to form the oil inlet 13011 and the oil outlet on the two end surfaces of the valve rod 13, of course, the oil inlet 13011 of the valve rod 13 can also be arranged on the outer circumferential surface of the valve rod 13; the oil outlet of the valve rod 13 can also be located on the outer circumferential surface of the valve rod 13.

[0061] The second sealing member 15 can be a sealing member for sealing the gap between the hole wall of the first through hole 11211 and the outer circumferential surface of the valve rod 13, and the second sealing member 15 can be a sealing ring, a sealing sleeve, a sealing plug and the like.

[0062] By adopting the technical scheme of the embodiment, the transformer oil sampling valve 10, in use, the blocking bead 12 does not block the oil inlet hole 1111, the oil enters the oil inlet space 11011 from the oil inlet hole 1111, and then flows out of the valve body 11 through the drainage channel 1301, thereby realizing the sampling and drainage of the oil. In this process, the first sealing element 14 is clamped between the outer peripheral surface of the valve stem 13 and the inner wall of the accommodation cavity 1101, and the first sealing element 14 can block the oil in the oil inlet space 11011 from flowing to the accommodation space 11012 along the gap between the outer peripheral surface of the valve stem 13 and the inner wall of the accommodation cavity 1101. Meanwhile, the second sealing element 15 is sleeved on the valve stem 13 and is used to seal the gap between the first through hole 11211 and the valve stem 13, and the second sealing element 15 can block the oil in the accommodation space 11012 from flowing out of the first through hole 11211. The first sealing element 14 and the second sealing element 15 form two sealing lines, and the two sealing lines form a redundant cooperation, thereby improving the sealing reliability of the transformer oil sampling valve 10, reducing the leakage of the oil, and improving the operation stability of the transformer 200. The cooperation of the drainage channel 1301 in the valve stem 13 and the two sealing lines can also effectively improve the sealing reliability of the sampling valve. The oil enters the oil inlet space 11011 with a large space from the oil inlet hole 1111, the oil is buffered, the pressure of the oil is reduced, the impact pressure of the oil on the first sealing element 14 is small, the risk of sealing failure of the first sealing element 14 is also reduced, and the sealing reliability of the transformer oil sampling valve 10 is also improved.

[0063] The oil in the oil inlet space 11011 directly flows out through the drainage channel 1301 in the valve stem 13, and the oil flows in the sealing structure of the valve body 11 and the valve stem 13 throughout the process, thereby reducing the leakage problem that may occur on the external interface of the valve body 11 and improving the sealing reliability of the transformer oil sampling valve 10. The design of the drainage channel 1301 integrates the oil flow channel in the interior of the valve stem 13, without the need for additional external interfaces and external pipelines, thereby reducing the volume of the transformer oil sampling valve 10.

[0064] In some embodiments, the valve stem 13 is provided with a first accommodating groove 1311, and part of the first sealing element 14 is accommodated in the first accommodating groove 1311, and the other part of the first sealing element 14 protrudes out of the first accommodating groove 1311 to abut against the inner wall of the accommodation cavity 1101, thereby realizing clamping sealing. The first accommodating groove 1311 can limit the first sealing element 14, guarantee the accuracy of the installation position of the first sealing element 14, and improve the sealing reliability.

[0065] In some embodiments, when the transformer oil sampling valve 10 is an oil inlet sampling valve 101, the oil in the transformer 200 flows into the subsequent first switch valve 28 through the oil inlet hole 1111, the oil inlet space 11011 and the flow channel 1301, and finally flows into the degassing tank 21. The valve rod 13 can be directly connected with the first switch valve 28 or connected with the first switch valve 28 through a pipeline or the like.

[0066] In some embodiments, when the transformer oil sampling valve 10 is an oil outlet sampling valve 102, the oil pump 22 pumps the oil in the degassing tank 21 into the transformer oil sampling valve 10, and the oil flows into the transformer 200 through the oil inlet hole 1111, the oil inlet space 11011 and the flow channel 1301.

[0067] In some cases, before the transformer 200 oil online monitoring device is popularized, the transformer 200 is only provided with upper, middle and lower offline sampling valves in the manufacturing stage, and no interface for the transformer 200 oil online monitoring device is reserved, so that the installation of the transformer 200 oil online monitoring device becomes a difficult point. The valve body 11 of the transformer oil sampling valve 10 provided in the embodiments has a simple structure, meets the replacement requirement of the offline sampling valve of the old transformer 200, and is conveniently applied to the modification and upgrading of the old transformer 200 to install the transformer 200 oil online monitoring device, and can also be applied to the installation of the transformer 200 oil online monitoring device of the newly manufactured transformer 200.

[0068] In some embodiments, at least part of the outer circumferential surface of the valve rod 13 between the first sealing member 14 and the first through hole 11211 is surrounded by the inner wall of the accommodation space 11012 to form the buffer cavity 11013.

[0069] The rod section of the valve rod 13 between the first sealing member 14 and the first through hole 11211 has at least part of the rod diameter smaller than the diameter of the accommodation space 11012, so that the outer circumferential surface of the valve rod 13 is spaced apart from the inner wall of the accommodation space 11012 to form the gap space, i.e. the buffer cavity 11013.

[0070] By adopting the technical scheme of the embodiment, the oil flows from the oil inlet space 11011 into the buffer cavity 11013 through the gap between the outer circumferential surface of the valve rod 13 and the inner wall of the accommodation cavity 1101. The space of the buffer cavity 11013 is large, so that the pressure of the oil can be reduced here, the pressure of the oil impacting the second sealing member 15 is small, the oil is buffered, the pressure of the oil impacting the second sealing member 15 is small, the risk of sealing failure of the second sealing member 15 is also reduced, and the sealing reliability of the transformer oil sampling valve 10 is also improved.

[0071] In some embodiments, the transformer oil sampling valve 10 further comprises a pressing member 16, the valve body 11 is provided with a partition plate 1121, the partition plate 1121 is provided with a first through hole 11211, the first through hole 11211 has a stepped surface 11212, the partition plate 1121 divides the internal space of the valve body 11 into a receiving cavity 1101 and a fixing cavity 1102, the pressing member 16 is fixed in the fixing cavity 1102 and presses the second sealing member 15 against the stepped surface 11212; the pressing member 16 is provided with a second through hole 1611, the valve rod 13 passes through the second through hole 1611.

[0072] The partition plate 1121 divides the internal space of the valve body 11 into the receiving cavity 1101 and the fixing cavity 1102, the partition plate 1121 is located between the receiving cavity 1101 and the fixing cavity 1102, the first through hole 11211 is arranged on the partition plate 1121, and the first through hole 11211 communicates the receiving cavity 1101 and the fixing cavity 1102.

[0073] The pressing member 16 can be a component for pressing and fixing the second sealing member 15, the pressing member 16 is fixed in the fixing cavity 1102, and the pressing member 16 can be fixed in the fixing cavity 1102 by means of threads, clamping, adhesion or the like. The pressing member 16 is provided with the second through hole 1611, the second through hole 1611 is for the valve rod 13 to pass through, the valve rod 13 passes through the first through hole 11211 and the second through hole 1611 to extend into the receiving cavity 1101, thereby pushing the blocking bead 12.

[0074] The first through hole 11211 is a stepped hole, in the stepped hole, the plane connecting the adjacent two hole walls with different diameters is the stepped surface 11212, the large-size end of the first through hole 11211 is arranged towards the fixing cavity 1102, one end of the second sealing member 15 can be inserted into the large-size end of the first through hole 11211, and the other end of the second sealing member 15 is pressed by the pressing member 16, thereby sealing the gap between the first through hole 11211 and the valve rod 13.

[0075] By adopting the technical scheme of this embodiment, the sealing mode of the second sealing member 15 is pressed and sealed by the pressing member 16, the sealing path of the second sealing member 15 is large, and the sealing performance of the second sealing member 15 is improved.

[0076] Please refer to Figures 5 to 7 As shown in the drawings, in some embodiments, the first through hole 11211 has a first inclined surface 11213, along the direction in which the first sealing member 14 points to the second sealing member 15, the first inclined surface 11213 gradually moves away from the axis of the valve rod 13 from the stepped surface 11212, and the second sealing member 15 has a second inclined surface 151 for abutting the first inclined surface 11213.

[0077] The hole wall of the section of the stepped hole closest to the fixing cavity 1102 is a first inclined surface 11213, the first inclined surface 11213 surrounds to form a horn mouth structure, the large size end of the horn mouth is arranged towards the fixing cavity 1102, one end of the second sealing element 15 is a tapered structure, the outer circumferential surface of the tapered structure is a second inclined surface 151, the first inclined surface 11213 is matched with the second inclined surface 151, so that the first inclined surface 11213 and the second inclined surface 151 can be abutted under the extrusion of the pressing element 16, so as to increase the sealing performance of the second sealing element 15.

[0078] By adopting the technical scheme of this embodiment, the first inclined surface 11213 and the second inclined surface 151 are abutted and sealed, the sealing path is increased, and the sealing performance of the second sealing element 15 is improved.

[0079] In some embodiments, the transformer oil sampling valve 10 further comprises a third sealing element 17, and the pressing element 16 is a pressing nut 161, the pressing nut 161 is threadedly connected in the fixing cavity 1102, the pressing nut 161 has a flange 1612 located on the side of the valve body 11 away from the oil inlet hole 1111, the third sealing element 17 is sleeved on the pressing nut 161, and the third sealing element 17 is clamped between the flange 1612 and the valve body 11.

[0080] The pressing nut 161 can refer to a nut for pressing and fixing the second sealing element 15. One end of the pressing nut 161 is screwed into the fixing cavity 1102, the pressing nut 161 is threadedly connected to the fixing cavity 1102, the installation operation of the pressing element 16 is convenient, and the threaded connection stability is good, which is beneficial to improve the stability of the pressing and fixing of the second sealing element 15 and the sealing stability of the second sealing element 15; the other end of the pressing nut 161 is provided with a flange 1612, the periphery of the flange 1612 protrudes from the outer circumferential surface of the threaded section of the pressing nut 161; the flange 1612 is located outside the fixing cavity 1102, and the flange 1612 abuts against the end surface of the valve body 11, so as to avoid that the pressing nut 161 is excessively screwed into the fixing cavity 1102 and the second sealing element 15 is excessively extruded to cause sealing failure.

[0081] The third sealing element 17 can refer to a sealing element for sealingly connecting the pressing nut 161 and the valve body 11, the third sealing element 17 is sleeved outside the pressing nut 161, after the pressing nut 161 is screwed into the fixing cavity 1102, the third sealing element 17 is clamped between the flange 1612 and the end surface of the valve body 11, so as to realize the sealing connection of the pressing nut 161 and the valve body 11.

[0082] By adopting the technical scheme of this embodiment, after the oil passes through the second sealing element 15, the third sealing element 17 can block the oil from flowing out of the valve body 11, the third sealing element 17 can form a third sealing line, and the sealing reliability of the transformer oil sampling valve 10 is improved.

[0083] In some embodiments, the compression nut 161 is provided with a second accommodating groove 1613, and a part of the third sealing element 17 is accommodated in the second accommodating groove 1613, and another part of the third sealing element 17 protrudes out of the second accommodating groove 1613 to abut against the end face of the valve body 11 to achieve clamping sealing. The second accommodating groove 1613 can limit the third sealing element 17, ensure the accuracy of the installation position of the third sealing element 17, and improve the sealing reliability.

[0084] In some embodiments, the valve stem 13 includes a first stem segment 131 and a second stem segment 132 connected together, the second stem segment 132 is arranged in the first penetrating hole 11211, the first stem segment 131 is located between the blocking bead 12 and the second stem segment 132, the first sealing element 14 is sleeved outside the first stem segment 131, the first stem segment 131 is provided with external threads, the external threads are located between the first sealing element 14 and the blocking bead 12, and the first stem segment 131 is threadedly connected with the inner wall of the accommodating cavity 1101 through the external threads.

[0085] In the axial direction of the valve body 11, the valve stem 13 can be divided into two segments, one of which is the first stem segment 131 abutting against the blocking bead 12, and the other is the second stem segment 132 arranged in the first penetrating hole 11211 and the second penetrating hole 1611, and the second stem segment 132 can also be directly connected with the first on-off valve 28.

[0086] The first sealing element 14 is sleeved on the first stem segment 131, the first stem segment 131 is provided with external threads, the first sealing element 14 is located between the external thread segment and the second stem segment 132, the external threads are threadedly connected with the inner wall of the accommodating cavity 1101, the inner wall of the accommodating cavity 1101 is provided with internal threads, and the external threads and the internal threads are engaged, so as to realize the threaded fixing of the valve stem 13 and the valve body 11.

[0087] By adopting the technical scheme of the embodiment, the first stem segment 131 is provided with external threads, the external threads are located between the first sealing element 14 and the blocking bead 12, and the first stem segment 131 is threadedly connected with the inner wall of the accommodating cavity 1101 through the external threads, so as to increase the resistance of the oil in the oil inlet space 11011 to flow to the first sealing element 14, and improve the sealing reliability of the transformer oil sampling valve 10. In addition, the first stem segment 131 is threadedly connected with the inner wall of the accommodating cavity 1101 through the external threads, so that the rotation of the valve stem 13 can realize the movement of the blocking bead 12 driven by the valve stem 13, and the valve stem 13 can be fixed and moved conveniently, and the structure design is ingenious.

[0088] In some embodiments, the second stem segment 132 is provided with a clamping structure 1321 for clamping with a wrench or the like, and the clamping structure 1321 can be a groove, a clamping surface or the like, so as to facilitate the rotation of the valve stem 13.

[0089] In some embodiments, the valve body 11 comprises a valve seat 111 and a sealing sleeve 112, the valve seat 111 has an oil inlet hole 1111, one end of the valve seat 111 is sealingly fixed in the sealing sleeve 112, an external thread is threadedly connected in the valve seat 111, and the first sealing member 14 is clamped between the inner wall of the valve seat 111 and the outer circumferential surface of the valve rod 13; the sealing sleeve 112 has a first through hole 11211.

[0090] The valve seat 111 can refer to a component for threadedly connecting with the valve rod 13, the oil inlet hole 1111 is arranged on the valve seat 111, after the valve rod 13 is threadedly connected in the valve seat 111, the valve seat 111 and the valve rod 13 jointly surround to form an oil inlet space 11011, and the sealing sleeve 112 can refer to a component for connecting with the valve seat 111 to surround to form a containing space 11012 and the first through hole 11211; the sealing sleeve 112 is in a hollow cylindrical shape, a partition plate 1121 is arranged in the sealing sleeve 112, and the compression nut 161 is fixed at one end of the sealing sleeve 112 away from the valve seat 111 to compress the second sealing member 15.

[0091] By adopting the technical scheme of this embodiment, the valve body 11 adopts the structural form of the valve seat 111 and the sealing sleeve 112, when assembling, the plugging bead 12 and the valve rod 13 can be first installed on the valve seat 111, then the valve rod 13 is arranged in the first through hole 11211 of the sealing sleeve 112, and then the sealing sleeve 112 is fixed on the valve seat 111, so that the assembly is convenient.

[0092] In some embodiments, the valve body 11 comprises a fourth sealing member 113, the valve seat 111 is threadedly connected in the sealing sleeve 112, the valve seat 111 has a flange 1112 located outside the sealing sleeve 112, and the fourth sealing member 113 is clamped between the flange 1112 and the sealing sleeve 112.

[0093] The flange 1112 can refer to a ring of protruding structure on the side of the valve seat 111, after the sealing sleeve 112 is screwed into the valve seat 111, the end face of the sealing sleeve 112 abuts on the flange 1112 of the valve seat 111, so as to position the installation position of the valve seat 111 and the sealing sleeve 112, and facilitate accurate assembly of components.

[0094] The fourth sealing member 113 can refer to a sealing member clamped between the flange 1112 of the valve seat 111 and the end face of the sealing sleeve 112; the fourth sealing member 113 can be a sealing ring, for example, an O-shaped sealing ring.

[0095] By adopting the technical scheme of the embodiment, the fourth sealing member 113 is clamped between the flange 1112 and the sealing sleeve 112, the fourth sealing member 113 can block the oil in the accommodation space 11012 from leaking through the gap between the valve seat 111 and the sealing sleeve 112, and the sealing reliability of the transformer oil sampling valve 10 is improved; the valve seat 111 is threadedly connected in the sealing sleeve 112, and the threaded connection between the valve seat 111 and the sealing sleeve 112 also has a sealing effect, the resistance of the oil in the accommodation space 11012 to flow to the fourth sealing member 113 is increased, and the sealing reliability of the transformer oil sampling valve 10 is improved.

[0096] Please refer to Figure 8 As shown in the drawings, in some embodiments, the valve rod 13 has an oil inlet 13011 that communicates with the drainage channel 1301, and the oil inlet 13011 is arranged on the outer circumferential side of the valve rod 13.

[0097] The oil inlet 13011 can be an opening arranged on the valve rod 13 and used for allowing oil to flow into the drainage channel 1301, and the oil inlet 13011 is arranged on the outer circumferential side of the valve rod 13.

[0098] By adopting the technical scheme of the embodiment, the oil inlet 13011 is not arranged opposite to the oil inlet hole 1111, so that the oil flowing into the oil inlet hole 1111 cannot directly flow into the oil inlet 13011, the oil is buffered in the oil inlet space 11011 before entering the oil inlet 13011, the pressure fluctuation of the oil is reduced, and the flow of the oil is facilitated.

[0099] In some embodiments, the transformer oil online detection device 100 includes the transformer oil sampling valve 10 and the online detection unit 20, and the online detection unit 20 communicates with the drainage channel 1301.

[0100] By adopting the technical scheme of the embodiment, the transformer oil sampling valve 10 is adopted, the sealing reliability of the transformer oil sampling valve 10 is good, the leakage of the oil is reduced, and the influence of the installation of the transformer oil online detection device 100 on the operation stability of the transformer 200 is reduced.

[0101] The transformer oil sampling valve 10 of the embodiment can effectively ensure the high reliability of the interface valve and the safe operation of the transformer 200; the switch valve arranged on the connection passage of the transformer oil sampling valve 10 and the oil pump 22 can realize the isolated maintenance and update of the transformer oil online detection device 100; the three-way structure arranged on the connection passage of the transformer oil sampling valve 10 and the oil pump 22 can realize the normal operation of the transformer oil online detection device 100, and the condition of the offline sampling comparison analysis of the transformer 200 is reserved.

[0102] The oil inlet 13011 of the valve rod 13 of the transformer oil sampling valve 10 is located on the side, the size of the oil inlet 13011 is smaller than the diameter of the drainage channel 1301 located inside the valve rod 13, the opening size of the oil inlet 13011 can effectively control the oil flow size and pressure, reduce the risk of leakage caused by oil pressure and ensure the accurate control of the required oil amount and flow rate of the device.

[0103] The transformer oil sampling valve 10 of the embodiment of the present application can quickly improve the old sampling valve on site, realize the replacement of the new valve module with oil after the transformer 200 is shut down, realize the installation of the transformer oil online detection device 100, and enhance the intelligent operation and maintenance conditions of the transformer 200.

[0104] The transformer oil sampling valve 10 of the embodiment of the present application, the first sealing element 14 and the second sealing element 15 are separated by the buffer cavity 11013, such a structure design can realize the installation, replacement and repair of the second sealing element 15 without affecting the first sealing element 14, thereby improving the availability and safety of the equipment.

[0105] The structure design of the transformer oil sampling valve 10 of the embodiment of the present application realizes the high reliability configuration of the transformer oil online detection device 100, and ensures the safe and reliable operation of the transformer 200.

[0106] The above description of each embodiment tends to emphasize the differences between each embodiment, and the same or similar parts can be referred to each other, and for the sake of brevity, the details are not described herein.

[0107] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A transformer oil sampling valve, characterized in that, include: The valve body has a receiving cavity and an oil inlet and a first through hole communicating with the receiving cavity; The sealing bead is located within the receiving cavity; A valve stem is inserted into the first through hole, and the sealing bead is located between the oil inlet and the valve stem. The valve stem is used to push the sealing bead to seal the oil inlet. A first sealing element is located within the receiving cavity. The first sealing element is clamped between the outer peripheral surface of the valve stem and the inner wall of the receiving cavity, and divides the receiving cavity into an oil inlet space and a receiving space. The oil inlet space is located between the first sealing element and the oil inlet hole, and the receiving space is located between the first sealing element and the first through hole. The valve stem has a drainage channel for draining the oil in the oil inlet space to the valve body. The valve stem passes through the receiving space. The second sealing element is sleeved on the valve stem and used to seal the gap between the first through hole and the valve stem.

2. The transformer oil sampling valve according to claim 1, characterized in that: The valve stem is located on at least a portion of the outer peripheral surface between the first seal and the first through hole, forming a buffer cavity with the inner wall of the receiving space.

3. The transformer oil sampling valve according to claim 1, characterized in that: The transformer oil sampling valve also includes a clamping component. The valve body is provided with a partition, the partition is provided with a first through hole, the first through hole has a stepped surface, the partition divides the internal space of the valve body into the receiving cavity and the fixed cavity, the clamping component is fixed in the fixed cavity and presses the second sealing component against the stepped surface; the clamping component is provided with a second through hole, and the valve stem passes through the second through hole.

4. The transformer oil sampling valve according to claim 3, characterized in that: The first through hole has a first inclined surface in the direction from the first seal to the second seal, the first inclined surface gradually moving away from the axis of the valve stem from the stepped surface, and the second seal has a second inclined surface for engaging with the first inclined surface.

5. The transformer oil sampling valve according to claim 3, characterized in that: The transformer oil sampling valve also includes a third sealing element. The clamping element is a clamping nut, which is threaded into the fixed cavity. The clamping nut has a flange, which is located on the side of the valve body opposite to the oil inlet. The third sealing element is sleeved on the clamping nut and clamped between the flange and the valve body.

6. The transformer oil sampling valve according to any one of claims 1 to 5, characterized in that: The valve stem includes a first rod segment and a second rod segment connected together. The second rod segment passes through the first through hole. The first rod segment is located between the sealing bead and the second rod segment. The first sealing element is sleeved outside the first rod segment. The first rod segment has an external thread. The external thread is located between the first sealing element and the sealing bead. The first rod segment is threadedly connected to the inner wall of the receiving cavity through the external thread.

7. The transformer oil sampling valve according to claim 6, characterized in that: The valve body includes a valve seat and a sealing sleeve. The valve seat has an oil inlet hole. One end of the valve seat is sealed and fixed inside the sealing sleeve. The external thread is threaded into the valve seat. The first sealing element is clamped between the inner wall of the valve seat and the outer peripheral surface of the valve stem. The sealing sleeve has the first through hole.

8. The transformer oil sampling valve according to claim 7, characterized in that: The valve body includes a fourth seal, the valve seat is threadedly connected to the sealing sleeve, the valve seat has a flange located outside the sealing sleeve, and the fourth seal is clamped between the flange and the sealing sleeve.

9. The transformer oil sampling valve according to any one of claims 1 to 5, characterized in that: The valve stem has an oil inlet that communicates with the drainage channel, and the oil inlet is located on the outer periphery of the valve stem.

10. An online transformer oil detection device, characterized in that: The device includes a transformer oil sampling valve and an online detection unit as described in any one of claims 1 to 9, wherein the online detection unit is connected to the drainage channel.

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