Capacitive oil-SF6 sleeve

Abstract

The utility model discloses a capacitive oil-SF6 bushing which comprises a bushing middle section, the outer wall of the bushing middle section is sleeved with a connecting sleeve and a butt flange, the connecting sleeve is fixedly connected with the butt flange, and a first sealing groove is formed in the side, away from the butt flange, of the connecting sleeve in the axial direction of the bushing middle section. A second sealing groove is formed in the side, away from the connecting sleeve, of the butt flange. The first pressing plate is embedded in the first sealing groove and fixedly connected with the connecting sleeve through a bolt, and a first sealing piece is clamped between the first pressing plate and the bottom of the first sealing groove; the second pressing plate is embedded in the second sealing groove and fixedly connected with the butt flange through a bolt, and a second sealing piece is clamped between the second pressing plate and the bottom of the second sealing groove. The sealing performance of the middle section of the casing pipe is improved by arranging the pressing plate sealing structure, the leakage risk of the areas at the two ends of the oil-SF6 casing pipe is reduced, and the operation stability of the casing pipe is improved.

Description

Technical Field

[0001] This utility model relates to the field of high voltage insulation technology, and in particular to a capacitor-type oil-SF6 bushing. Background Technology

[0002] Oil-SF6 (sulfur hexafluoride) bushings are essential components for the operation of some large power transformers. For capacitive oil-SF6 bushings, they are mainly used for transitional connections between oil-immersed power transformers and SF6 fully enclosed switchgear. However, because the end of the bushing operating in the SF6 gas environment is under high pressure due to the high pressure of the SF6 gas, there is a certain risk of leakage.

[0003] Therefore, how to improve the sealing performance of oil-SF6 casing and enhance its operational safety is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a capacitor-type oil-SF6 bushing with strong sealing performance and safer operation.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A capacitive oil-SF6 bushing, comprising:

[0007] The middle section of the sleeve is fitted with a connecting sleeve and a docking flange on its outer wall. The connecting sleeve and the docking flange are fixedly connected. In the axial direction of the middle section of the sleeve, a first sealing groove is provided on the side of the connecting sleeve away from the docking flange, and a second sealing groove is provided on the side of the docking flange away from the connecting sleeve.

[0008] A first pressure plate and a second pressure plate. The first pressure plate is embedded in the first sealing groove and is fixedly connected to the connecting sleeve by bolts. A first sealing element is sandwiched between the first pressure plate and the bottom of the first sealing groove. The second pressure plate is embedded in the second sealing groove and is fixedly connected to the mating flange by bolts. A second sealing element is sandwiched between the second pressure plate and the bottom of the second sealing groove.

[0009] Preferably, in the above-mentioned capacitive oil-SF6 bushing, the first sealing groove is disposed in contact with the outer wall of the middle section of the bushing, and the first sealing groove is an annular structure.

[0010] Preferably, in the above-mentioned capacitive oil-SF6 bushing, the first seal simultaneously contacts the first pressure plate, the bottom of the first sealing groove, and the outer wall of the middle section of the bushing.

[0011] Preferably, in the above-mentioned capacitive oil-SF6 bushing, the first pressure plate is embedded in and completely fills the first sealing groove.

[0012] Preferably, the above-mentioned capacitive oil-SF6 bushing further includes a third sealing element and a fourth sealing element, wherein the third sealing element is spaced apart from the first sealing element, and the third sealing element is pressed against the contact area between the connecting sleeve and the middle section of the bushing;

[0013] The fourth sealing element is spaced apart from the second sealing element, and the fourth sealing element is pressed against the contact area between the mating flange and the middle section of the sleeve.

[0014] Preferably, in the above-mentioned capacitive oil-SF6 bushing, a fifth sealing element is pressed between the contact surfaces of the connecting sleeve and the mating flange.

[0015] Preferably, in the above-mentioned capacitive oil-SF6 bushing, one end of the middle section of the bushing is connected to the front section of the bushing, and the end of the front section of the bushing is provided with a first sealing nut and a terminal. The first sealing nut is fixed to the terminal and the front section of the bushing on both axial sides of the front section of the bushing by bolts, and a sixth sealing element is provided by pressing the contact surface between the first sealing nut and the front section of the bushing.

[0016] Preferably, in the above-mentioned capacitive oil-SF6 bushing, the other end of the middle section of the bushing is connected to the rear section of the bushing, and the end of the rear section of the bushing is provided with a second sealing nut. The second sealing nut is fixed to the bushing base by bolts, and a seventh sealing element is provided on the contact surface between the second sealing nut and the bushing base.

[0017] Preferably, in the above-mentioned capacitive oil-SF6 bushing, a plurality of sealing elements are provided at intervals on the contact surface between the bushing base and the main body area of ​​the rear section of the bushing.

[0018] Preferably, in the above-mentioned capacitive oil-SF6 bushing, the inside of the connecting sleeve is filled with insulating silicone grease.

[0019] As can be seen from the above technical solution, the capacitive oil-SF6 bushing provided by this utility model has grooves on the connecting sleeve and the docking flange in the middle section of the bushing, and the sealing element is pressed to the bottom of the groove by the pressure plate structure. The integrated structure of the connecting sleeve and the docking flange maintains its own structural integrity, and provides auxiliary sealing structures for the first and second sealing elements from both sides in the axial direction of the middle section of the bushing. The grooved setting of the first and second sealing elements and the pressing setting of the pressure plate structure can further improve the setting stability of the first and second sealing elements, reduce the displacement risk during the use of the bushing, improve the sealing stability of the middle section of the bushing, and reduce the overall leakage risk of the bushing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the capacitive oil-SF6 bushing structure provided in this embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the middle section of the casing;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the front end of the casing;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the rear end of the casing.

[0025] Wherein, 10-middle section of the sleeve; 20-front section of the sleeve; 210-first sealing nut; 220-terminal; 30-rear section of the sleeve; 310-second sealing nut; 320-sleeve base; 40-connecting sleeve; 410-first sealing groove; 50-butting flange; 510-second sealing groove; 610-first pressure plate; 620-second pressure plate; 710-first sealing element; 720-second sealing element; 730-third sealing element; 740-fourth sealing element; 750-fifth sealing element; 760-sixth sealing element; 770-seventh sealing element. Detailed Implementation

[0026] The core of this utility model lies in disclosing a capacitor-type oil-SF6 bushing with strong sealing performance and safer operation.

[0027] To enable those skilled in the art to better understand the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the invention as described in the claims.

[0028] like Figure 1 and Figure 2As shown, the capacitive oil-SF6 bushing provided in this embodiment mainly includes a bushing section 10, a connecting sleeve 40, a mating flange 50, a first pressure plate 610, and a second pressure plate 620. Specifically, the connecting sleeve 40 and the mating flange 50 are sleeved on the outer wall of the bushing section 10 and are fixedly connected to form a connection structure on the outer wall of the bushing section 10. In addition, sealing grooves are provided on the connecting sleeve 40 and the mating flange 50. Specifically, in the axial direction of the bushing section 10, the connecting sleeve 40 has a first sealing groove 410 on the side away from the mating flange 50, and the mating flange 50 has a second sealing groove 510 on the side away from the connecting sleeve 40. For the integrated structure of the connecting sleeve 40 and the mating flange 50, the first sealing groove 410 and the second sealing groove 510 are provided on both sides of the integrated structure in the axial direction of the bushing section 10.

[0029] Based on this, the first pressure plate 610 is embedded in the first sealing groove 410 to fill the slotted area of ​​the connecting sleeve 40. At the same time, the first pressure plate 610 and the connecting sleeve 40 are fixedly connected by bolts. The bolts pass through the first pressure plate 610 and are inserted into the connecting sleeve 40 to fix the first pressure plate 610. It should be noted that the first pressure plate 610 and the bottom of the first sealing groove 410 are sandwiched with a first sealing element 710. The first sealing element 710 can be a sealing ring or rubber. Under the action of the first pressure plate 610 and the bolts, it is pressed to the bottom of the first sealing groove 410, thereby improving the sealing performance of the connecting sleeve 40 on the side away from the mating flange 50.

[0030] Correspondingly, the second pressure plate 620 is embedded in the second sealing groove 510. At the same time, the second pressure plate 620 and the connecting sleeve 40 are fixedly connected by bolts. The bolts pass through the second pressure plate 620 and are inserted into the mating flange 50 to fix the second pressure plate 620. Meanwhile, the second pressure plate 620 and the bottom of the second sealing groove 510 are clamped together with the second sealing element 720. The second sealing element 720 can also be stably pressed to the bottom of the second sealing groove 510 under the locking and pressing action of the second pressure plate 620 and the bolts, so that the mating flange 50 maintains a stable sealing effect on the side away from the connecting sleeve 40.

[0031] It should be noted that in some embodiments of this utility model, the first pressure plate 610 and the second pressure plate 620 have the same structure so as to achieve universality.

[0032] Furthermore, in some embodiments of this utility model, the first sealing groove 410 is disposed in close contact with the outer wall of the middle section 10 of the sleeve. The first sealing groove 410 is designed as an annular structure. This design makes it easier to process the first sealing groove 410 on the connecting sleeve 40, allowing it to be processed at the edge of the connecting sleeve 40. The groove can be completed simply by cutting a bevel, without needing to recess the groove into one end face of the connecting sleeve 40. Preferably, the first sealing groove 410 is an annular structure, providing a more regular structural design on the outer wall of the middle section 10, thus ensuring more complete contact between the first sealing element 710 and the outer wall of the middle section 10. It should be noted that the second sealing groove 510 can have the same structure as the first sealing groove 410, so that the area on the mating flange 50 where the second sealing groove 510 is located has the same effect as the area on the connecting sleeve 40 where the first sealing groove 410 is located. This will not be elaborated further here.

[0033] Based on the above embodiments, one side of the first sealing groove 410 is fitted against the outer wall of the sleeve middle section 10. Correspondingly, the first sealing element 710 simultaneously contacts the first pressure plate 610, the bottom of the first sealing groove 410, and the outer wall of the sleeve middle section 10. This allows the first sealing element 710 to simultaneously achieve a sealing effect on the first pressure plate 610 and the sleeve middle section 10, the first pressure plate 610 and the connecting sleeve 40, and the connecting sleeve 40 and the sleeve middle section 10 under the pressing action of the first pressure plate 610. It should also be noted that in some embodiments of this utility model, the first pressure plate 610 precisely fills the first sealing groove 410 opened on the connecting sleeve 40. Here, "precisely fills" specifically means that when the first pressure plate 610 is embedded in the first sealing groove 410 and locked with the connecting sleeve 40, the side of the connecting sleeve 40 away from the mating flange 50, that is, the side of the connecting sleeve 40 where the first sealing groove 410 is opened, is a single complete planar structure.

[0034] It should be noted that the above embodiments only describe the structure of the first sealing groove 410 and the first pressure plate 610. Similarly, the second sealing groove 510 and the second pressure plate 620 provided on the docking flange 50 can have the same structural form, which will not be described again here.

[0035] To further improve the sealing performance of the middle section 10 of the sleeve, in some embodiments of this utility model, the capacitor-type oil-SF6 sleeve also includes a third sealing element 730 and a fourth sealing element 740. The third sealing element 730, similar to the first sealing element 710, is disposed in the contact area between the connecting sleeve 40 and the outer wall of the middle section 10 of the sleeve, and the third sealing element 730 is spaced apart from the first sealing element 710. The third sealing element 730 is stably disposed by the pressing action of the connecting sleeve 40 during the assembly process on the middle section 10 of the sleeve, and by being spaced apart from the first sealing element 710, a secondary sealing effect is achieved between the connecting sleeve 40 and the middle section 10 of the sleeve in the axial direction.

[0036] Correspondingly, the fourth seal 740 is disposed in the contact area between the mating flange 50 and the outer wall of the sleeve middle section 10, and the fourth seal 740 is disposed at an interval from the second seal 720. The fourth seal 740 is stably disposed by the pressing action of the mating flange 50 on the sleeve middle section 10 during assembly, and the sealing performance on the mating flange 50 side is preferred by the spacing between it and the second seal 720.

[0037] Furthermore, in some embodiments of this utility model, a fifth sealing element 750 is provided on the contact surface of the connecting sleeve 40 and the mating flange 50. The fifth sealing element 750 has an annular structure. It should be noted that the contact surface of the connecting sleeve 40 and the mating flange 50 can be slotted to allow the fifth sealing element 750 to be embedded. At the same time, the fifth sealing element 750 can also be pressed by the locking action of the connecting sleeve 40 and the mating flange 50 during the fixed connection, so as to achieve a sealing effect on the contact surface of the connecting sleeve 40 and the mating flange 50.

[0038] Furthermore, such as Figure 3 As shown, in the capacitive oil-SF6 bushing provided in this embodiment of the present invention, one end of the bushing middle section 10 is connected to the bushing front section 20, and the end of the bushing front section 20 is provided with a terminal 220. In order to improve the sealing performance of the end of the bushing front section 20, a first sealing nut 210 is provided at the end of the bushing front section 20. The first sealing nut 210 is disposed between the terminal 220 and the main body of the bushing front section 20 for auxiliary sealing. Specifically, in the axial direction of the bushing front section 20, the two sides of the first sealing nut 210 are respectively connected to the terminal 220. The main body of the terminal block 220 and the front section 20 of the sleeve is fixed by bolts so that the first sealing nut 210 can be pressed into the front section 20 of the sleeve. At the same time, a sixth sealing element 760 is provided on the contact surface between the first sealing nut 210 and the front section 20 of the sleeve. It should be noted that since there are multiple contact surfaces between the first sealing nut 210 and the front section 20 of the sleeve, it is preferable to provide multiple sixth sealing elements 760 to form a multi-level seal, which cooperates with the sealing structure of the front section 20 of the sleeve itself to improve the sealing effect of the front section 20 of the sleeve and reduce the risk of leakage.

[0039] Correspondingly, such as Figure 4 As shown, the other end of the middle section 10 of the sleeve is connected to the rear section 30 of the sleeve. At the same time, a second sealing nut 310 is provided at the end of the rear section 30 of the sleeve. The second sealing nut 310 is also fixed to the sleeve base 320 of the rear section 30 of the sleeve by bolts. A seventh sealing element 770 is provided on the contact surface between the second sealing nut 310 and the sleeve base 320. At the same time, several sealing elements are also provided at intervals on the contact surface between the sleeve base 320 and the main body area of ​​the rear section 30 of the sleeve, so as to cooperate with the seventh sealing element 770 to achieve a multi-level sealing effect of the rear section 30 of the sleeve.

[0040] Furthermore, in the capacitive oil-SF6 bushing provided in this embodiment of the present invention, the connecting sleeve 40 is filled with insulating silicone grease to ensure the sealing reliability of the middle section 10 of the bushing.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0043] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed, and is not intended to limit this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. The scope of this utility model is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this utility model.

Claims

1. A capacitor-type oil-SF6 bushing, characterized in that, include: The middle section of the sleeve is fitted with a connecting sleeve and a docking flange on its outer wall. The connecting sleeve and the docking flange are fixedly connected. In the axial direction of the middle section of the sleeve, a first sealing groove is provided on the side of the connecting sleeve away from the docking flange, and a second sealing groove is provided on the side of the docking flange away from the connecting sleeve. A first pressure plate and a second pressure plate. The first pressure plate is embedded in the first sealing groove and is fixedly connected to the connecting sleeve by bolts. A first sealing element is sandwiched between the first pressure plate and the bottom of the first sealing groove. The second pressure plate is embedded in the second sealing groove and is fixedly connected to the mating flange by bolts. A second sealing element is sandwiched between the second pressure plate and the bottom of the second sealing groove.

2. The capacitive oil-SF6 bushing as described in claim 1, characterized in that, The first sealing groove is fitted to the outer wall of the middle section of the sleeve, and the first sealing groove is an annular structure.

3. The capacitive oil-SF6 bushing as described in claim 2, characterized in that, The first seal simultaneously contacts the first pressure plate, the bottom of the first sealing groove, and the outer wall of the middle section of the sleeve.

4. The capacitive oil-SF6 bushing as described in claim 1, characterized in that, The first pressure plate is embedded in and completely fills the first sealing groove.

5. The capacitive oil-SF6 bushing as described in claim 1, characterized in that, It also includes a third seal and a fourth seal, wherein the third seal is spaced apart from the first seal and is pressed against the contact area between the connecting sleeve and the middle section of the sleeve; The fourth sealing element is spaced apart from the second sealing element, and the fourth sealing element is pressed against the contact area between the mating flange and the middle section of the sleeve.

6. The capacitive oil-SF6 bushing as described in claim 1, characterized in that, The contact surfaces of the connecting sleeve and the mating flange are pressed together with a fifth sealing element.

7. The capacitive oil-SF6 bushing as described in claim 1, characterized in that, One end of the middle section of the sleeve is connected to the front section of the sleeve. The end of the front section of the sleeve is provided with a first sealing nut and a terminal. The first sealing nut is fixed to the terminal and the front section of the sleeve on both axial sides of the front section of the sleeve by bolts. A sixth sealing element is provided by pressing the contact surface between the first sealing nut and the front section of the sleeve.

8. The capacitive oil-SF6 bushing as described in claim 7, characterized in that, The other end of the middle section of the sleeve is connected to the rear section of the sleeve. The end of the rear section of the sleeve is provided with a second sealing nut. The second sealing nut is fixed to the sleeve base by bolts, and a seventh sealing element is provided on the contact surface between the second sealing nut and the sleeve base.

9. The capacitive oil-SF6 bushing as described in claim 8, characterized in that, The contact surface between the sleeve base and the main body area of ​​the rear section of the sleeve is provided with several sealing elements at intervals.

10. The capacitive oil-SF6 bushing as described in claim 1, characterized in that, The connecting sleeve is filled with insulating silicone grease.

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