Sealed sampling equipment for oil liquid of transformer

Abstract

The invention provides transformer oil sealing sampling equipment which comprises a fixed sampling head, a valve, a conversion tube and a vacuum tube, the fixed sampling head is arranged at a transformer oil outlet, the free end of the fixed sampling head is detachably provided with the conversion tube, and the vacuum tube is movably connected with the tail end of the conversion tube; a compression unit is arranged at the joint of the conversion tube and the fixed sampling head, so that the conversion tube is completely attached to the outer surface of the fixed sampling head; the pressing unit plays a sealing role, the conversion tube is sleeved on the outer surface of the fixed sampling head, and the oil outlet of the conversion tube is closed, so that once the transformer oil flows out, the conversion tube can be quickly filled, and the turbidity degree of the transformer oil can be directly observed; after observation is completed, the oil outlet is directly opened, the vacuum tube is connected, the transformer oil directly flows into the vacuum tube due to the fact that pressure difference exists between the conversion tube and the vacuum tube, the inner surface of the vacuum tube does not need to be lubricated, and the purpose that no air enters a vacuum sampling point is achieved.

Description

Technical Field

[0001] The invention relates to transformer oil sealing sampling equipment, belonging to the technical field of transformers. Background Art

[0002] Oil-immersed transformer is a box-type transformer that uses mineral oil as the main insulating medium and cooling medium of the transformer. The main components of the transformer are immersed in an oil tank filled with mineral oil, and the wiring terminals are led out from the top of the oil tank cover. Compared with other types of transformers, oil-immersed transformers have a relatively simple structure, relatively low cost, and low maintenance cost. Therefore, they are widely used and are an indispensable electrical equipment in the current power supply network system.

[0003] When maintaining the safe and stable operation of equipment or accepting new oil, it is necessary to take samples of the transformer oil for inspection. The former is to detect the performance changes of the oil in time after the transformer is operated so as to take corresponding measures. The latter is to ensure that the transformer oil meets various performance indicators and relevant standards and requirements, and to avoid transformer oil with quality problems from entering the transformer, thereby bringing safety hazards to future equipment operation.

[0004] The requirements for transformer oil sampling are: the sampling process requires full sealing, that is, the sampling connection method must be reliable, neither the water and gas dissolved in the oil can escape, nor can it be mixed with air, and no bubbles should be generated in the oil during operation.

[0005] Due to the different sizes of sampling ports of oil-filled transformers, there is a mismatch between the transformer on-site oil drain valve and the sampling tool connector, resulting in the inability to meet the transformer oil sampling requirements; in this regard, the prior art discloses an application number of 202310531976.0, and the name of the patent application is a transformer oil sealed sampling connector, which discloses that pressing the connecting connector makes the first rotation limiter move away from the second rotation limiter. At this time, rotating the connecting connector can make the regulating valve component change from a closed state to an open state, and the oil flow rate can be controlled by the rotation angle. At this time, the oil can be introduced into the sampling tube through the connecting connector and the rubber hose; the sampling end process: pulling the connecting connector makes the inner tube control component rest on the fixed sampling head, at this time the inner tube control component and the regulating valve component are separated, the regulating valve component automatically turns to a closed state, and then the sampling head opening and closing valve is turned by a wrench to close it. By limiting the inner tube control component, it can match the fixed sampling heads of different apertures, thereby avoiding oil leakage.

[0006] However, the prior art still has the following problems: the prior art over-limits the inner tube control component to match fixed sampling heads of different apertures, but the fixed sampling head is still exposed to the outside, and after multiple samplings, the outer surface will be worn, and it is impossible to achieve complete fit and sealing when connected to the outer surface of the fixed sampling head, and there is no sealing measure in the middle when the sampling tube is introduced through the connecting joint and the rubber hose.

[0007] Therefore, the present invention provides a transformer oil sealed sampling device with complete sealing and vacuum sampling. Summary of the invention

[0008] The present invention provides a transformer oil seal sampling device, which can effectively solve the above problems.

[0009] The present invention is achieved in that:

[0010] A transformer oil sealed sampling device comprises a fixed sampling head, a valve, a conversion tube and a vacuum tube. The fixed sampling head is arranged at the transformer oil outlet, a valve for controlling the opening and closing of the transformer oil is arranged on the fixed sampling head, a conversion tube is detachably mounted on the free end of the fixed sampling head, and the vacuum tube is movably connected with the end of the conversion tube;

[0011] Wherein, a compression unit is provided at the connection between the conversion tube and the fixed sampling head to achieve complete fit between the conversion tube and the outer surface of the fixed sampling head.

[0012] As a further improvement, the compression unit comprises an annular vertical portion and an inclined portion, wherein the inclined portion is in the shape of a truncated cone with a hollow interior, and the inclined portion is fixed to the inner surface of one end of the vertical portion.

[0013] As a further improvement, the compression unit is an annular sealing ring whose first surface is an inclined surface.

[0014] As a further improvement, the compression unit comprises a second thread engraved on the inner surface of the conversion tube and an O-ring, and the second thread matches the external thread of the fixed sampling head.

[0015] As a further improvement, the conversion tube comprises a tube body and a groove, the head end of the tube body is detachably connected to the fixed sampling head, and an annular groove is opened on the inner surface of the head end of the tube body, and the groove is used to assemble the compression unit to achieve a tight fit between the tube body and the fixed sampling head after assembly;

[0016] The oil outlet part and the oil outlet are provided, the tail end of the tube body is the oil outlet part, and an oil outlet is provided on the end surface of the oil outlet part, and the oil outlet of the oil outlet part faces downward.

[0017] As a further improvement, the cross-sectional area of ​​the junction between the oil outlet portion and the tube body is larger than the cross-sectional area of ​​the oil outlet.

[0018] As a further improvement, an angle A is formed between the inner surface of the tube body and the horizontal plane, wherein the angle A is 2-10°.

[0019] As a further improvement, symmetrically arranged hanging ears are fixed to the outer surface of the tube body.

[0020] As a further improvement, the conversion tube is made of transparent material.

[0021] As a further improvement, a sealing sleeve is also included for temporarily closing the oil outlet.

[0022] The beneficial effects of the present invention are:

[0023] The compression unit of the present invention plays a sealing role, and because the conversion tube is sleeved on the outer surface of the fixed sampling head, the oil outlet of the conversion tube is closed. Once the transformer oil flows out, it will quickly fill the conversion tube, and the turbidity degree of the transformer oil can be directly observed; after the observation is completed, the oil outlet is directly opened and the vacuum tube is connected. Due to the pressure difference between the conversion tube and the vacuum tube, the transformer oil directly flows into the vacuum tube, and there is no need to lubricate the inner surface of the vacuum tube, thereby achieving the purpose of no air entering the vacuum sampling point.

[0024] The compression unit of the present invention has three different structures, which can achieve complete fitting between the conversion tube and the outer surface of the fixed sampling head, play a sealing role, have strong practicality and provide a variety of options.

[0025] The oil outlet and the oil outlet of the present invention improve the problem of liquid splashing during traditional sampling. The liquid does not directly spray the staff, and the liquid is discharged in a concentrated manner, which is more efficient and can accurately align the vacuum tube for rapid sampling.

[0026] The present invention also includes a sealing sleeve for temporarily sealing the oil outlet. An annular protrusion is fixed on the outer surface of the oil outlet. After the sealing sleeve is installed thereon, it plays a role of temporary sealing. The temporary sealed conversion tube can be directly observed and the inside of the conversion tube can be flushed to prevent impurities from being carried into the transformer oil by the conversion tube and causing sampling contamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic structural diagram of a transformer oil sealing sampling device provided in Example 1 of the present invention.

[0029] Figure 2 It is a schematic diagram of the structural decomposition of a transformer oil seal sampling device provided in Example 1 of the present invention.

[0030] Figure 3 It is a schematic cross-sectional view of a conversion tube of a transformer oil sealing sampling device provided in Example 1 of the present invention.

[0031] Figure 4 It is a schematic diagram of the sealing sleeve structure of a transformer oil sealing sampling device provided in Example 1 of the present invention.

[0032] Figure 5 It is a schematic diagram of the structure of a compression unit of a transformer oil liquid seal sampling device provided in Example 1 of the present invention.

[0033] Figure 6 It is a schematic diagram of the structure of a compression unit of a transformer oil liquid seal sampling device provided in Example 2 of the present invention.

[0034] Figure 7 It is a schematic diagram of the structure of a compression unit of a transformer oil liquid seal sampling device provided in Example 3 of the present invention.

[0035] Explanation of the reference numerals: fixed sampling head 10, valve 20, conversion tube 30, vacuum tube 40, sealing sleeve 50, compression unit 301, tube body 302, groove 303, oil outlet 304, oil outlet 305, hanging ear 306, vertical portion 311, inclined portion 312, first surface 313, second thread 314, O-ring 315. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] Example 1

[0039] Reference Figure 1 , Figure 2 As shown, a transformer oil sealed sampling device comprises a fixed sampling head 10, a valve 20, a conversion tube 30, and a vacuum tube 40. The fixed sampling head 10 is arranged at the transformer oil outlet, and the fixed sampling head 10 is provided with a valve 20 for controlling the opening and closing of the transformer oil. The free end of the fixed sampling head 10 is detachably equipped with the conversion tube 30, and the vacuum tube 40 is movably connected with the end of the conversion tube 30.

[0040] Among them, a compression unit 301 is provided at the connection between the conversion tube 30 and the fixed sampling head 10 to achieve complete fitting between the conversion tube 30 and the outer surface of the fixed sampling head 10, that is, the compression unit 301 also plays a sealing role, and because the conversion tube 30 is sleeved on the outer surface of the fixed sampling head 10, the oil outlet 305 of the conversion tube 30 is closed, once the transformer oil flows out, it will quickly fill up the conversion tube 30, and the turbidity of the transformer oil can be directly observed.

[0041] After the observation is completed, the oil outlet 305 is directly opened and the vacuum tube 40 is connected. Due to the pressure difference between the conversion tube 30 and the vacuum tube 40, the transformer oil flows directly into the vacuum tube 40 without lubricating the inner surface of the vacuum tube 40, thereby achieving the purpose of preventing air from entering the vacuum sampling point.

[0042] Furthermore, the vacuum tube 40 is engraved with scales marking the volume of the vacuum tube 40 , and a label marking the sampling time and sampling location can be attached to the outer surface of the vacuum tube 40 , which is more intuitive and convenient.

[0043] Among them, Figure 5 As shown, the compression unit 301 includes a ring-shaped vertical portion 311 and an inclined portion 312. The inclined portion 312 is a hollow truncated cone. The inclined portion 312 is fixed to the inner surface of one end of the vertical portion 311. Figure 5 It can be known that the vertical portion 311 and the inclined portion 312 will directly form a ring structure with a single-side V-shaped cross-section. The connecting portion of the vertical portion 311 and the inclined portion 312 faces the fixed sampling head 10. After being assembled in the groove 303, the inclined portion 312 opens toward the center, automatically pressing the outer surface of the fixed sampling head 10 to achieve sealing.

[0044] Among them, Figure 3 As shown, the conversion tube 30 comprises a tube body 302 and a groove 303. The head end of the tube body 302 is detachably connected to the fixed sampling head 10, and an annular groove 303 is opened on the inner surface of the head end of the tube body 302. The groove 303 is used to assemble the compression unit 301 to achieve a tight fit between the tube body 302 and the fixed sampling head 10 after assembly.

[0045] The oil outlet part 304 and the oil outlet 305, the tail end of the tube body 302 is the oil outlet part 304, and the oil outlet 305 is opened on the end face of the oil outlet part 304, the oil outlet 305 of the oil outlet part 304 faces downward, including but not limited to vertically downward and inclined downward. As long as the liquid can be discharged in a concentrated manner, the liquid will not splash around, and the liquid will not directly spray on the staff. When connected to the vacuum tube 40, the position can be quickly found, and the connection is fast and stable.

[0046] Furthermore, the cross-sectional area of ​​the connection between the oil outlet 304 and the tube body 302 is larger than the cross-sectional area of ​​the oil outlet 305, which improves the problem of liquid splashing during traditional sampling. The liquid does not directly spray the staff, and the liquid is concentrated and more efficient.

[0047] In one specific embodiment, there is an angle A between the inner surface of the tube body 302 and the horizontal plane, wherein the angle A is 2-10°, and optimally, the angle A is 10°. The larger the angle, the larger the inclined surface, the less likely it is that transformer oil will remain in the tube body 302, the dripping is clean, and the sampling capacity is easier to control.

[0048] In one specific embodiment, the outer surface of the tube body 302 is further fixed with symmetrically arranged hanging ears 306, so that when assembling the conversion tube 30, the tube body 302 can be easily controlled to rotate, thereby achieving the purpose of labor-saving assembly.

[0049] In one specific embodiment, the conversion tube 30 is made of transparent material, including but not limited to resin material and transparent plastic material. As long as the liquid inside the conversion tube 30 can be observed, the above material is low in cost. If the transformer oil used is too turbid, the conversion tube 30 can be used as a disposable material and thrown away after use.

[0050] In one specific embodiment, the conversion tube 30 has a thickness of 0.3-1 cm, which is an appropriate thickness and is not easily deformed by compression or broken by being dropped.

[0051] like Figure 1 and Figure 4 As shown, the present invention further includes a sealing sleeve 50 for temporarily sealing the oil outlet 305. An annular protrusion is fixed on the outer surface of the oil outlet 304. After the sealing sleeve 50 is mounted thereon, it plays a role of temporary sealing. The temporary sealed conversion tube can be directly observed and the inside of the conversion tube can be flushed to prevent impurities from being carried into the transformer oil and causing sampling contamination. The impurities mentioned here include but are not limited to water and dust.

[0052] Example 2

[0053] like Figure 6As shown, this embodiment is different from Embodiment 1 in that: the compression unit 301 is an annular sealing ring whose first surface 313 is an inclined surface. During assembly, the thin end of the annular sealing ring faces the fixed sampling head 10. After being assembled in the groove 303, the thick end of the annular sealing ring automatically compresses the outer surface of the fixed sampling head 10 to achieve sealing.

[0054] It should be pointed out that the implementation principle and technical effects of this embodiment are the same as those of Embodiment 1. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding contents in Embodiment 1.

[0055] Example 3

[0056] like Figure 7 As shown, this embodiment is different from Embodiment 1 in that: the compression unit 301 includes a second thread 314 and an O-ring 315 engraved on the inner surface of the conversion tube 30, the second thread 314 cooperates with the outer thread of the fixed sampling head 10, and the O-ring 315 is assembled in the groove 303. As the conversion tube 30 and the fixed sampling head 10 are threadedly matched, the outer surface of the fixed sampling head 10 is automatically compressed to achieve sealing.

[0057] It should be pointed out that the implementation principle and technical effects of this embodiment are the same as those of Embodiment 1. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding contents in Embodiment 1.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transformer oil seal sampling device, characterized in that: The invention comprises a fixed sampling head (10), a valve (20), a conversion tube (30), and a vacuum tube (40); the fixed sampling head (10) is arranged at the transformer oil outlet; the fixed sampling head (10) is provided with a valve (20) for controlling the opening and closing of the transformer oil; the free end of the fixed sampling head (10) is detachably equipped with the conversion tube (30); and the vacuum tube (40) is movably connected to the end of the conversion tube (30); Wherein, a compression unit (301) is provided at the connection between the conversion tube (30) and the fixed sampling head (10) to achieve complete fit between the conversion tube (30) and the outer surface of the fixed sampling head (10).

2. A transformer oil seal sampling device as claimed in claim 1, characterized in that: The compression unit (301) comprises an annular vertical portion (311) and an inclined portion (312). The inclined portion (312) is in the shape of a truncated cone with a hollow interior. The inclined portion (312) is fixed to the inner surface of one end of the vertical portion (311).

3. A transformer oil seal sampling device as claimed in claim 1, characterized in that: The compression unit (301) is an annular sealing ring whose first surface (313) is an inclined surface.

4. A transformer oil seal sampling device as claimed in claim 1, characterized in that: The compression unit (301) comprises a second thread (314) engraved on the inner surface of the conversion tube (30) and an O-ring (315), wherein the second thread (314) matches the outer thread of the fixed sampling head (10).

5. A transformer oil seal sampling device as claimed in claim 2, 3 or 4, characterized in that: The conversion tube (30) comprises a tube body (302) and a groove (303); the head end of the tube body (302) is detachably connected to the fixed sampling head (10), and an annular groove (303) is formed on the inner surface of the head end of the tube body (302); the groove (303) is used to assemble the compression unit (301) so as to achieve a tight fit between the tube body (302) and the fixed sampling head (10) after assembly; An oil outlet portion (304) and an oil outlet (305), wherein the tail end of the tube body (302) is the oil outlet portion (304), and an oil outlet (305) is provided on the end surface of the oil outlet portion (304), and the oil outlet (305) of the oil outlet portion (304) faces downward.

6. A transformer oil seal sampling device as claimed in claim 5, characterized in that: The cross-sectional area of ​​the connection between the oil outlet portion (304) and the tube body (302) is greater than the cross-sectional area of ​​the oil outlet (305).

7. A transformer oil seal sampling device as claimed in claim 5, characterized in that: An angle A is formed between the inner surface of the tube body (302) and the horizontal plane, wherein the angle A is 2-10°.

8. A transformer oil seal sampling device as claimed in claim 5, characterized in that: The outer surface of the tube body (302) is also fixed with symmetrically arranged hanging ears (306).

9. A transformer oil seal sampling device as claimed in claim 1, characterized in that: The conversion tube (30) is made of transparent material.

10. A transformer oil seal sampling device as claimed in claim 5, characterized in that: It also includes a sealing sleeve (50) for temporarily sealing the oil outlet (305).

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