Sealing structure of oil tank of oil-immersed transformer

Abstract

The utility model relates to the field of oil-immersed transformers, and discloses a sealing structure of an oil-immersed transformer oil tank, which comprises an oil tank, an oil level gauge is fixedly arranged on the side wall of the oil tank, a sealing mechanism is in threaded connection with the side wall of the oil tank, and the sealing mechanism comprises a threaded cylinder, a sealing sleeve and a plugging cover. The threaded cylinder is connected to the side wall of the oil tank in a threaded mode, a sealing sleeve is arranged on one side of the threaded cylinder, and the sealing sleeve comprises a sealing gasket, a telescopic sleeve, a connecting pipe, a sealing plug, a supporting block and a one-way valve. When the oil tank sealing performance detection device is used for detecting the sealing performance of the oil tank, the pressurizing pipeline penetrates through the threaded cylinder, the sealing plug is extruded through the air pressure pipe to be ejected out of the through hole, and meanwhile the telescopic sleeve is ejected to stretch, so that the one-way valve on the connecting pipe extends out of the through hole; oil liquid can be prevented from entering the inner side of the sealing sleeve, the situation that the oil liquid affects operation is avoided, operation is convenient, and practicability is high.

Description

Technical Field

[0001] The present application relates to the field of oil-immersed transformers, and in particular to a sealing structure of an oil tank of an oil-immersed transformer. Background Art

[0002] The oil-immersed transformer is a new type of high-performance transformer with a more reasonable structure and better performance. This product is more suitable for urban and rural, industrial and mining enterprise power grid transformation, and is more suitable for combined transformers and prefabricated transformers for substations. The oil-immersed transformer needs to be tested for sealing before it is put into use. The conventional operation is to remove the oil level gauge on the oil tank and perform an air pressure test through the opening of the oil level gauge. However, the sealing test is not performed when the oil level gauge is installed, and the test effect is not good.

[0003] For example, the Chinese utility model patent with the announcement number CN214149697U discloses a pressure sealing test structure for an oil-immersed transformer, the oil-immersed transformer includes a transformer oil tank with a hollow chamber; the transformer oil tank is provided with an oil level installation hole and a pressurizing hole, both of which are interconnected with the hollow chamber, the transformer oil tank is connected with an oil level installation cylinder arranged up and down corresponding to the oil level installation hole, the transformer oil tank is connected with a pressurizing cylinder arranged up and down corresponding to the pressurizing hole, an oil level gauge is installed in the oil level installation cylinder, a sealing plug is installed in the pressurizing cylinder in a detachable manner, a pressurizing cover is sleeved on the pressurizing cylinder, and the sealing plug and the pressurizing cylinder are both located within the cover setting range of the pressurizing cover. When performing a sealing test before leaving the factory, it is only necessary to remove the sealing plug from the pressurizing cylinder, and then pressurize the transformer oil tank from the pressurizing cylinder to test the sealing of the transformer oil tank, and at this time, the sealing of the oil level installation hole is also tested together to avoid oil leakage at the oil level installation hole.

[0004] With respect to the above-mentioned related technologies, the inventor believes that when the scheme performs a sealing test on the oil tank through the pressurized hole, the pressurized hole is directly connected to the oil tank, and during the test, the oil is easy to intrude into the inner side of the pressurized hole, which is not only easy to contaminate the testing equipment, but also the oil remains inside the pressurized hole, which is not conducive to the subsequent sealing operation;

[0005] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0006] In order to solve the problem that the oil tank of the existing oil-immersed transformer is subjected to inconvenient detection operation and poor detection effect during the sealing detection.

[0007] The field of oil-immersed transformers provided by this application adopts the following technical solutions:

[0008] A sealing structure for an oil tank of an oil-immersed transformer comprises an oil tank, an oil level gauge is fixedly provided on the side wall of the oil tank, a sealing mechanism is threadedly connected on the side wall of the oil tank, the sealing mechanism comprises a threaded barrel, a sealing sleeve and a blocking cover, the threaded barrel is threadedly connected to the side wall of the oil tank, a sealing sleeve is provided on one side of the threaded barrel, the sealing sleeve comprises a sealing gasket, a telescopic sleeve, a connecting pipe, a sealing plug, a supporting block and a one-way valve, the sealing gasket is clamped on the side wall of the oil tank, a telescopic sleeve is fixedly provided on one side wall of the sealing gasket, a connecting pipe is connected through one end of the telescopic sleeve, a sealing plug is fixedly connected on one end of the connecting pipe, a supporting block is fixedly provided on the side wall of the sealing plug, a one-way valve is fixedly provided on the top of the connecting pipe, a contraction spring is provided on the inner side of the contraction spring, one end of the contraction spring is fixedly connected to the sealing gasket, and the other end of the contraction spring is fixedly connected to the side wall of the sealing plug, an air pressure pipe is inserted into the inner side of the threaded barrel, and a blocking cover is fixedly connected to the outer side of the threaded barrel.

[0009] Preferably, a threaded groove is provided on the side wall of the oil tank, a through hole is provided on one side of the threaded groove, the threaded barrel is threadedly connected to the inner side of the threaded groove, the sealing gasket is fitted on one side wall of the threaded groove, the sealing gasket is located on one side of the threaded barrel, and the telescopic sleeve and the connecting pipe are both located on the inner side of the through hole.

[0010] Preferably, a sealing ring is fixedly provided on the inner wall of the threaded barrel, the sealing ring is made of flexible material, and the sealing ring is sleeved on the outside of the air pressure tube. A blocking ring is fixedly provided on the outer wall of the threaded barrel, and the blocking ring is located on the outside of the thread groove.

[0011] Preferably, the support block is located on one side of the air pressure tube.

[0012] Preferably, the sealing cover comprises a connecting band, a threaded cover and a sealing rod, one end of the connecting band is fixedly connected to the barrier ring, the other end of the connecting band is fixedly provided with a threaded cover, and the sealing rod is fixedly provided at the inner middle part of the threaded cover.

[0013] Preferably, the inner size of the threaded cover matches the outer size of the threaded barrel, and the size of the blocking rod matches the inner size of the sealing ring.

[0014] In summary, this application includes the following beneficial technical effects:

[0015] 1. Through the provided threaded barrel and sealing sleeve, a threaded groove and a through hole are opened on the side wall of the oil tank of the oil-immersed transformer, the sealing gasket at one end of the sealing sleeve is placed on the inner side of the threaded groove, and the other end of the sealing sleeve is passed through the through hole, and then the threaded barrel is tightened on the inner side of the threaded groove to squeeze and fix the sealing gasket, and the sealing plug is pulled by the contraction spring in the sealing sleeve so that the sealing plug seals the through hole. When the oil tank is tested for tightness, the pressurized pipeline is passed through the threaded barrel, and the sealing plug is squeezed out of the through hole by the air pressure pipe, and the expansion sleeve is stretched at the same time, so that the one-way valve on the connecting pipe extends out of the through hole. The one-way valve is provided to facilitate the air pressure pipe to inflate and pressurize the inside of the oil tank, while preventing the oil from being immersed in the inside of the sealing sleeve, and preventing the oil from affecting the operation. The operation is convenient and practical.

[0016] 2. Through the threaded barrel, a sealing ring is arranged on the inner wall of the threaded barrel. The sealing ring made of flexible material can be tightly bound to the outside of the air pressure tube when the air pressure tube is inserted, which is convenient for sealing detection and can be applied to different inflation pipelines;

[0017] 3. A blocking cap is connected to one side of the threaded barrel through the setting of the blocking cap. When no detection is performed, the blocking cap can be threadedly connected to the threaded barrel so that the blocking rod passes through the sealing ring inside the threaded barrel. The sealing ring and the blocking rod are connected to the installation position of the sealing mechanism to seal again. Multiple sealings have good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the application;

[0019] Figure 2 is a partial cross-sectional view of an embodiment of the application;

[0020] Figure 3 It is an application example Figure 2 The enlarged schematic diagram of point A in the middle;

[0021] Figure 4 It is a three-dimensional cross-sectional view of the sealing mechanism and the air pressure tube of the embodiment of the application.

[0022] Explanation of the reference numerals: 1. oil tank; 11. threaded groove; 12. through hole; 2. oil level gauge; 3. sealing mechanism; 31. threaded cylinder; 311. sealing ring; 312. barrier ring; 32. sealing sleeve; 321. sealing gasket; 322. telescopic sleeve; 323. connecting pipe; 324. sealing plug; 325. supporting block; 326. one-way valve; 327. contraction spring; 33. sealing cover; 331. connecting belt; 332. threaded cover; 333. sealing rod; 4. air pressure pipe. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-4This application is described in further detail.

[0024] The embodiment of the present application discloses a sealing structure of an oil-immersed transformer oil tank, comprising an oil tank 1, an oil level gauge 2 is fixedly provided on the side wall of the oil tank 1, and a sealing mechanism 3 is threadedly connected on the side wall of the oil tank 1;

[0025] Reference Figure 1 , Figure 2 Figure 3 and Figure 4 As shown, specifically, the sealing mechanism 3 includes a threaded barrel 31, a sealing sleeve 32 and a blocking cover 33. The threaded barrel 31 is threadedly connected to the side wall of the oil tank 1. A sealing sleeve 32 is provided on one side of the threaded barrel 31. The sealing sleeve 32 includes a sealing gasket 321, a telescopic sleeve 322, a connecting pipe 323, a sealing plug 324, a supporting block 325 and a one-way valve 326. The sealing gasket 321 is clamped on the side wall of the oil tank 1. The sealing gasket 321 is made of a flexible material. A telescopic sleeve 322 is fixedly provided on one side wall of the sealing gasket 321. The telescopic sleeve 322 is made of a flexible material and can be stretched or contracted. One end of the telescopic sleeve 322 penetrates The through connection is provided with a connecting pipe 323, one end of which is fixedly connected with a sealing plug 324, which is engaged with one side of the through hole 12, and a supporting block 325 is fixedly provided on the side wall of the sealing plug 324, and a one-way valve 326 is fixedly provided on the top of the connecting pipe 323, and the one-way valve 326 is a one-way air valve, which belongs to the prior art and is not described in detail. A contraction spring 327 is provided on the inner side of the telescopic sleeve 322, one end of the contraction spring 327 is fixedly connected to the sealing gasket 321, and the other end of the contraction spring 327 is fixedly connected to the side wall of the sealing plug 324, and the inner side of the threaded cylinder 31 is plugged into a There is an air pressure pipe 4, and a sealing cover 33 is fixedly connected to the outer side of the threaded barrel 31; a threaded groove 11 is opened on the side wall of the oil tank 1, and a through hole 12 is connected to one side of the threaded groove 11, and the threaded barrel 31 is threadedly connected to the inner side of the threaded groove 11, and the sealing gasket 321 is attached to one side wall of the threaded groove 11, and the sealing gasket 321 is located on one side of the threaded barrel 31, and the telescopic sleeve 322 and the connecting pipe 323 are both located on the inner side of the through hole 12; the support block 325 is located on one side of the air pressure pipe 4, and the support block 325 supports one end of the air pressure pipe 4 to facilitate air circulation; this scheme is clamped on the oil tank 1 of the oil-immersed transformer The sealing sleeve 32 is threadedly connected to the threaded tube 31 to squeeze and fix the sealing sleeve 32. When the sealing test is not performed, the contraction spring 327 of the sealing sleeve 32 pulls the sealing plug 324 to clamp it on one end of the through hole 12 for sealing. When performing the test, the air pressure tube 4 is inserted into the inner side of the sealing sleeve 32 to push the sealing plug 324 to move, so that the one-way valve 326 on the connecting pipe 323 extends out of the through hole 12, and is inflated through the air pressure tube 4. The gas enters the inner side of the oil tank 1 through the one-way valve 326 for testing. The operation is convenient, and the one-way valve 326 is set during operation to avoid oil from entering the testing area, thereby improving the testing effect.

[0026] Reference Figure 4 As shown, specifically, a sealing ring 311 is fixedly provided on the inner wall of the threaded tube 31. The sealing ring 311 is made of a flexible material. The sealing ring 311 is sleeved on the outer side of the air pressure tube 4. During detection, the sealing ring 311 can tightly bind the air pressure tubes 4 of different sizes, and the sealing effect is good. A blocking ring 312 is fixedly provided on the outer wall of the threaded tube 31. The blocking ring 312 is located on the outer side of the threaded groove 11; the blocking cover 33 includes a connecting belt 331, a threaded cover 332 and a blocking rod 333. One end of the connecting belt 331 is fixedly connected to On the barrier ring 312, a threaded cover 332 is fixedly provided at the other end of the connecting belt 331, and a sealing rod 333 is fixedly provided at the inner middle part of the threaded cover 332; the inner size of the threaded cover 332 is matched with the outer size of the threaded tube 31, and the size of the sealing rod 333 is matched with the inner size of the sealing ring 311; when not detected, the sealing cover 33 is threadedly connected to the threaded tube 31, so that the sealing rod 333 is inserted into the inner side of the sealing ring 311, so as to further seal the detection part, and the sealing effect is good.

[0027] The implementation principle of the sealing structure of an oil-immersed transformer oil tank in an embodiment of the present application is as follows: when the oil tank 1 of the oil-immersed transformer is tested for sealing performance, the sealing cover 33 is twisted and removed, and then the air pressure tube 4 connected to the external inflation device is inserted into the inner side of the sealing sleeve 32, so that the air pressure tube 4 pushes the sealing plug 324 out of the through hole 12, so that the connecting tube 323 drives the one-way valve 326 to extend out of the through hole 12, and then the inside of the oil tank 1 is inflated through the one-way valve 326 to perform a sealing test, which is easy to operate.

[0028] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0029] Secondly: In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0030] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

[0031] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sealing structure for an oil tank of an oil-immersed transformer, comprising an oil tank (1), characterized in that: An oil level gauge (2) is fixedly provided on the side wall of the oil tank (1). A sealing mechanism (3) is threadedly connected to the side wall of the oil tank (1). The sealing mechanism (3) comprises a threaded barrel (31), a sealing sleeve (32) and a blocking cover (33). The threaded barrel (31) is threadedly connected to the side wall of the oil tank (1). A sealing sleeve (32) is provided on one side of the threaded barrel (31). The sealing sleeve (32) comprises a sealing gasket (321), a telescopic sleeve (322), a connecting pipe (323), a sealing plug (324), a supporting block (325) and a one-way valve (326). The sealing gasket (321) is clamped on the side wall of the oil tank (1). A telescopic sleeve (322) is fixedly provided on one side wall of the sealing gasket (321). One end of the telescopic sleeve (322) is connected through a connecting pipe (323), one end of the connecting pipe (323) is fixedly connected to a sealing plug (324), a supporting block (325) is fixedly provided on the side wall of the sealing plug (324), a one-way valve (326) is fixedly provided on the top of the connecting pipe (323), a contraction spring (327) is provided on the inner side of the telescopic sleeve (322), one end of the contraction spring (327) is fixedly connected to the sealing gasket (321), and the other end of the contraction spring (327) is fixedly connected to the side wall of the sealing plug (324), an air pressure pipe (4) is inserted into the inner side of the threaded barrel (31), and a sealing cover (33) is fixedly connected to the outer side of the threaded barrel (31).

2. The sealing structure of an oil-immersed transformer tank according to claim 1, characterized in that: A thread groove (11) is provided on the side wall of the oil tank (1), a through hole (12) is provided on one side of the thread groove (11), the threaded barrel (31) is threadedly connected to the inner side of the thread groove (11), the sealing gasket (321) is attached to one side wall of the thread groove (11), the sealing gasket (321) is located on one side of the threaded barrel (31), and the telescopic sleeve (322) and the connecting pipe (323) are both located on the inner side of the through hole (12).

3. The sealing structure of an oil-immersed transformer tank according to claim 2, characterized in that: A sealing ring (311) is fixedly provided on the inner wall of the threaded barrel (31), the sealing ring (311) is made of a flexible material, and the sealing ring (311) is sleeved on the outer side of the air pressure tube (4). A blocking ring (312) is fixedly provided on the outer wall of the threaded barrel (31), and the blocking ring (312) is located on the outer side of the threaded groove (11).

4. The sealing structure of an oil-immersed transformer tank according to claim 3 is characterized in that: The support block (325) is located on one side of the air pressure tube (4).

5. The sealing structure of an oil-immersed transformer tank according to claim 4, characterized in that: The blocking cover (33) comprises a connecting belt (331), a threaded cover (332) and a blocking rod (333); one end of the connecting belt (331) is fixedly connected to the barrier ring (312); the other end of the connecting belt (331) is fixedly provided with the threaded cover (332); and the blocking rod (333) is fixedly provided at the inner middle part of the threaded cover (332).

6. The sealing structure of an oil-immersed transformer tank according to claim 5, characterized in that: The inner dimension of the threaded cover (332) matches the outer dimension of the threaded barrel (31), and the dimension of the blocking rod (333) matches the inner dimension of the sealing ring (311).

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