GIS sealing structure

Abstract

The invention discloses a GIS (gas insulated switchgear) sealing structure which comprises a groove, and a plurality of first V-shaped sealing strips distributed in an array are arranged on a bottom plate of the groove; the sealing ring is arranged in the groove and partially exposed, a plurality of second V-shaped sealing strips distributed in an array mode are arranged on the side face of the sealing ring, the second V-shaped sealing strips and the first V-shaped sealing strips are arranged in a staggered mode, and the opening directions of the second V-shaped sealing strips and the opening directions of the first V-shaped sealing strips are opposite; the end cover can make contact with the sealing ring and exert pressure on the sealing ring. The first V-shaped sealing strip and the second V-shaped sealing strip with opposite openings are utilized, when the sealing ring is pressed to deform, the second V-shaped sealing strip expands laterally so that a channel between the second V-shaped sealing strip and the first V-shaped sealing strip can be narrowed, and the effect of limiting leakage of insulating gas is achieved; and the contact between the sealing ring and the groove is mainly completed by the second V-shaped sealing strip, and the contact area is small, so that the abrasion to the sealing ring is reduced, and the service life of the sealing ring can be prolonged. The invention relates to the technical field of sealing structures.

Description

Technical Field

[0001] The invention relates to the technical field of sealing structures, and in particular to a GIS sealing structure. Background Art

[0002] Gas Insulated Substation (GIS) is a type of substation. In a gas insulated substation, most of the electrical equipment is directly or indirectly sealed in a pipe tree composed of metal pipes and casings, and no switches, lines, or terminals can be seen from the outside. The interior of the pipe tree uses SF6 gas as the insulating medium, and all high-voltage electrical components are sealed in a grounded metal cylinder, thereby using insulating gas as the insulating medium, which has better insulation performance. Therefore, in order to avoid insulation failure caused by insulation gas leakage from the structure, GIS has higher requirements for sealing.

[0003] The existing GIS generally fills the joints of the casing with sealing rings. When the casing is assembled and the sealing rings are squeezed, the sealing rings that expand laterally under pressure can seal the joints to prevent the insulating gas inside the casing from leaking out. However, this sealing structure mainly relies on the elastic deformation of the sealing rings. GIS works under high temperature and high pressure. The harsh working environment will accelerate the aging of the sealing rings, causing the sealing rings to lose elasticity or crack. After the insulating gas leaks from the casing, it will cause a short circuit, resulting in a greater safety accident.

[0004] Therefore, how to extend the service life of the sealing ring in GIS while ensuring that it can meet the sealing requirements is a technical problem that needs to be solved to improve the sealing structure of GIS. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a GIS sealing structure, which can extend the service life of the sealing ring and has a high sealing performance to complete the sealing work.

[0006] The present invention also provides a GIS having the above GIS sealing structure.

[0007] The GIS sealing structure according to the first embodiment of the present invention includes:

[0008] A groove, the groove comprising a bottom plate and a side plate, the side plates are two in number and are respectively arranged on both sides of the bottom plate, and the bottom plate is provided with a plurality of first V-shaped sealing strips distributed in an array;

[0009] A sealing ring, the sealing ring is placed in the groove and partially exposed, a plurality of second V-shaped sealing strips distributed in an array are arranged on the side of the sealing ring, the second V-shaped sealing strips are staggered with the first V-shaped sealing strips and have opening directions opposite to each other, and a channel is arranged between adjacent first V-shaped sealing strips and second V-shaped sealing strips;

[0010] an end cap, the end cap being detachably connected to the groove and confining the sealing ring within the groove, the end cap being capable of contacting the sealing ring and applying pressure thereto;

[0011] Wherein, the sealing ring is deformed under the force of the end cover, and the second V-shaped sealing strip expands laterally and narrows the channel.

[0012] The GIS sealing structure according to the embodiment of the present invention has at least the following beneficial effects: by utilizing the first V-shaped sealing strip and the second V-shaped sealing strip with opposite openings, when the sealing ring is deformed under pressure, the second V-shaped sealing strip expands laterally to narrow the channel between the second V-shaped sealing strip and the first V-shaped sealing strip, thereby limiting the leakage of insulating gas; and because the contact between the sealing ring and the groove is mainly completed by the second V-shaped sealing strip, the contact area is small, thereby reducing the wear on the sealing ring and being able to extend the service life of the sealing ring.

[0013] According to some embodiments of the present invention, the first V-shaped sealing strip and the second V-shaped sealing strip are both provided with two intersecting wing strips, and in adjacent first V-shaped sealing strips and second V-shaped sealing strips, the channel is formed between the wing strip of the first V-shaped sealing strip and the wing strip of the second V-shaped sealing strip.

[0014] According to some embodiments of the present invention, an angle between two intersecting wing strips is 60 to 90 degrees.

[0015] According to some embodiments of the present invention, the height of the wing strip is 2 to 5 μm.

[0016] According to some embodiments of the present invention, the width of the wing strip is 1 to 3 μm.

[0017] According to some embodiments of the present invention, the length of the wing strip is 15 to 20 μm.

[0018] According to some embodiments of the present invention, the cross-section of the wing strip is semicircular or polygonal.

[0019] According to some embodiments of the present invention, the opening direction of the first V-shaped sealing strip is the same as the leakage direction of the insulating gas, and the opening direction of the second V-shaped sealing strip is opposite to the leakage direction of the insulating gas.

[0020] According to some embodiments of the present invention, a distance between two adjacent first V-shaped sealing strips and a distance between two adjacent second V-shaped sealing strips are 5 to 8 μm.

[0021] The GIS according to the second aspect of the present invention comprises the above-mentioned GIS sealing structure, wherein the groove is arranged at the joint of the GIS casing.

[0022] The GIS according to the embodiment of the present invention has at least the following beneficial effects: by using the GIS sealing structure, the sealing performance of the GIS can be improved, the service life of the sealing ring can be extended, and the subsequent maintenance cost can be reduced.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 A three-dimensional diagram and a partial enlarged diagram of the groove 100 in the GIS sealing structure of the first embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the installation of the first V-shaped sealing strip 130 and the second V-shaped sealing strip 210 in the GIS sealing structure of the first aspect of the embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the GIS sealing structure in the first aspect of the present invention when the end cover 400 is not assembled with the groove 100;

[0028] Figure 4 It is a schematic diagram of the assembly of the end cover 400 and the groove 100 in the GIS sealing structure of the first embodiment of the present invention.

[0029] Reference numerals: 100 - groove, 110 - bottom plate, 120 - side plate, 130 - first V-shaped sealing strip, 200 - sealing ring, 210 - second V-shaped sealing strip, 300 - channel, 400 - end cover. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0035] Gas Insulated Substation (GIS) is a type of substation. In a gas insulated substation, most of the electrical equipment is directly or indirectly sealed in a pipe tree composed of metal pipes and casings, and no switches, lines, or terminals can be seen from the outside. The interior of the pipe tree uses SF6 gas as the insulating medium, and all high-voltage electrical components are sealed in a grounded metal cylinder, thereby using insulating gas as the insulating medium, which has better insulation performance. Therefore, in order to avoid insulation failure caused by insulation gas leakage from the structure, GIS has higher requirements for sealing.

[0036] The existing GIS generally fills the joints of the casing with sealing rings. When the casing is assembled and the sealing rings are squeezed, the sealing rings that expand laterally under pressure can seal the joints to prevent the insulating gas inside the casing from leaking out. However, this sealing structure mainly relies on the elastic deformation of the sealing rings. GIS works under high temperature and high pressure. The harsh working environment will accelerate the aging of the sealing rings, causing the sealing rings to lose elasticity or crack. After the insulating gas leaks from the casing, it will cause a short circuit, resulting in a greater safety accident.

[0037] Therefore, how to extend the service life of the sealing ring in GIS while ensuring that it can meet the sealing requirements is a technical problem that needs to be solved to improve the sealing structure of GIS.

[0038] In this regard, the present application proposes a GIS sealing structure, which utilizes a first V-shaped sealing strip 130 and a second V-shaped sealing strip 210 with opposite openings. When the sealing ring 200 is deformed under pressure, the second V-shaped sealing strip 210 expands laterally to narrow the channel 300 between it and the first V-shaped sealing strip 130, thereby limiting the leakage of insulating gas; and because the contact between the sealing ring 200 and the groove 100 is mainly completed by the second V-shaped sealing strip 210, the contact area is small, thereby reducing the wear on the sealing ring 200, and can extend the service life of the sealing ring 200.

[0039] In addition, the present application also proposes a GIS, which can improve the sealing performance of the GIS and extend the service life of the sealing ring by using the present GIS sealing structure, thereby reducing subsequent maintenance costs.

[0040] The GIS sealing structure in the embodiment of the first aspect of the present application includes a groove 100, a sealing ring 200 and an end cover 400. The groove 100 is set at the joint of the GIS housing, which is a C-shaped groove, and the inner space is used to install the sealing ring 200. The sealing ring 200 is an elastic member. When the end cover 400 is connected to the groove 100 and the sealing ring 200 is completely confined in the groove 100, the end cover 400 can apply pressure to the sealing ring 200 to deform it. The deformed sealing ring 200 fits tightly with the groove 100, and the sealing ring 200 expands laterally under pressure, compressing the gap in the groove 100, which can prevent the insulating gas from leaking from the gap and produce a sealing effect.

[0041] Specifically, refer to Figure 1 The groove 100 includes a bottom plate 110 and a side plate 120. The number of the side plates 120 is two and they are respectively arranged on both sides of the bottom plate 110, so that the bottom plate 110 and the two side plates 120 together form a C-shaped structure. The bottom plate 110 is provided with a plurality of first V-shaped sealing strips 130 distributed in an array, and the front view shape of the first V-shaped sealing strip 130 is a V-shaped strip.

[0042] The sealing ring 200 is placed in the groove 100 and partially exposed. A plurality of second V-shaped sealing strips 210 distributed in an array are arranged on the side of the sealing ring 200. Figure 2 The second V-shaped sealing strips 210 and the first V-shaped sealing strips 130 are arranged alternately and have opposite opening directions, and a channel 300 is arranged between adjacent first V-shaped sealing strips 130 and second V-shaped sealing strips 210 .

[0043] Reference Figure 3 The end cap 400 is detachably connected to the groove 100 and restricts the sealing ring 200 in the groove 100. The end cap 400 can contact the sealing ring 200 and apply pressure to it. Figure 4 Since the sealing ring 200 is partially exposed from the groove 100, when the end cover 400 is installed, the sealing ring 200 is deformed under the action of the end cover 400, and the second V-shaped sealing strip 210 expands laterally and narrows the channel 300, making it difficult for the insulating gas to flow through each channel 300, thereby completing the sealing work.

[0044] The first V-shaped sealing strip 130 and the second V-shaped sealing strip 210 with openings facing opposite directions divide the gap between the groove 100 and the sealing ring 200 into a plurality of channels 300, thereby increasing the resistance of the insulating gas when flowing in each channel 300, thereby preventing the leakage of the insulating gas. Moreover, when the sealing ring 200 is deformed under pressure, the second V-shaped sealing strip 210 expands laterally to shrink the channel 300. When the insulating gas flows through, the narrowed channel 300 generates a fluid dynamic pressure effect, suppressing the generation of negative pressure in the GIS and preventing the leakage of the insulating gas.

[0045] Specifically, the first V-shaped sealing strip 130 and the second V-shaped sealing strip 210 are each provided with two intersecting wing strips, and in adjacent first V-shaped sealing strips 130 and second V-shaped sealing strips 210, a channel 300 is formed between the wing strips of the first V-shaped sealing strip 130 and the wing strips of the second V-shaped sealing strip 210. Due to the shape restrictions of the first V-shaped sealing strip 130 and the second V-shaped sealing strip 210, each channel 300 is at an angle to each other, so that the flow path of the insulating gas becomes tortuous, increasing the resistance to its leakage.

[0046] Furthermore, the angle between the two intersecting wing strips is 60 to 90 degrees, which ensures that the opening range of the first V-shaped sealing strip 130 and the second V-shaped sealing strip 210 is large enough, thereby better completing the sealing work.

[0047] Specifically, the height of the wing strip is 2 to 5 μm, the width of the wing strip is 1 to 3 μm, the length of the wing strip is 15 to 20 μm, and the cross-sectional shape of the wing strip is semicircular or polygonal. It is easy to understand that the wing strip can also adopt other structures and shapes to achieve similar sealing effects, which will not be repeated here.

[0048] Further, refer to Figure 2 The opening direction of the first V-shaped sealing strip 130 is the same as the leakage direction of the insulating gas, and the opening direction of the second V-shaped sealing strip 210 is opposite to the leakage direction of the insulating gas. Therefore, when the insulating gas tends to leak, it will be blocked by the two wing strips of the second V-shaped sealing strip 210. The two wing strips guide the insulating gas to the middle of the second V-shaped sealing strip 210, thereby preventing it from entering the channel 300.

[0049] Furthermore, the interval between two adjacent first V-shaped sealing strips 130 and two adjacent second V-shaped sealing strips 210 is 5 to 8 μm.

[0050] A GIS in an embodiment of the second aspect of the present application includes the above-mentioned GIS sealing structure, and the groove 100 is arranged at the joint of the GIS casing, thereby achieving a sealing effect on the internal environment of the GIS.

[0051] Below, the specific sealing effect of this GIS sealing structure is explained based on comparative tests:

[0052] Embodiment 1:

[0053] Texture is only provided on the surface of the sealing ring 200. The sealing ring 200 is first subjected to an aging test under high temperature and high pressure. After aging, the sealing ring 200 is placed in the groove 100 and covered with the end cover 400 to test its sealing performance. The working pressure is 0.8Mpa, the compression rate of the sealing ring 200 is 30%, and insulating gas is filled into the device. After a period of time, the gas leakage amount is obtained.

[0054] Embodiment 2:

[0055] Textures are only provided on the surface of the groove 100. The sealing ring 200 is first subjected to an aging test at high temperature and high pressure, and after aging, the sealing ring 200 is placed in the groove 100 to test its sealing performance, the working pressure is 0.8Mpa, the compression rate of the sealing ring 200 is 30%, and insulating gas is filled into the device, and the gas leakage is obtained after a period of time.

[0056] Embodiment 3:

[0057] A first V-shaped sealing strip 130 is arranged on the surface of the groove 100, and a second V-shaped sealing strip 210 is arranged on the surface of the sealing ring 200. The sealing ring 200 is first subjected to an aging test at high temperature and high pressure, and after aging, the sealing ring is placed in the groove 100 to test its sealing performance, the working pressure is 0.8Mpa, the compression rate of the sealing ring 200 is 30%, and the insulating gas is filled into the device, and the gas leakage is obtained after a period of time.

[0058] Refer to the experimental data in the following table:

[0059]

[0060] It can be seen that after using the GIS sealing structure in the present application, the gas leakage is significantly reduced, and the service life of the sealing ring 200 is also significantly extended, meeting the requirements of GIS for sealing performance.

[0061] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A GIS sealing structure, characterized in that: include: A groove, the groove comprising a bottom plate and a side plate, the side plates are two in number and are respectively arranged on both sides of the bottom plate, and the bottom plate is provided with a plurality of first V-shaped sealing strips distributed in an array; A sealing ring, the sealing ring is placed in the groove and partially exposed, a plurality of second V-shaped sealing strips distributed in an array are arranged on the side of the sealing ring, the second V-shaped sealing strips are staggered with the first V-shaped sealing strips and have opening directions opposite to each other, and a channel is arranged between adjacent first V-shaped sealing strips and second V-shaped sealing strips; an end cap, the end cap being detachably connected to the groove and confining the sealing ring within the groove, the end cap being capable of contacting the sealing ring and applying pressure thereto; Wherein, the sealing ring is deformed under the force of the end cover, and the second V-shaped sealing strip expands laterally and narrows the channel.

2. The GIS sealing structure according to claim 1, characterized in that: The first V-shaped sealing strip and the second V-shaped sealing strip are both provided with two intersecting wing strips, and in adjacent first V-shaped sealing strips and second V-shaped sealing strips, the channel is formed between the wing strips of the first V-shaped sealing strip and the wing strips of the second V-shaped sealing strip.

3. The GIS sealing structure according to claim 2, characterized in that: The angle between the two intersecting wing strips is 60 to 90 degrees.

4. The GIS sealing structure according to claim 2, characterized in that: The height of the wing strip is 2 to 5 μm.

5. The GIS sealing structure according to claim 2, characterized in that: The width of the wing strip is 1 to 3 μm.

6. The GIS sealing structure according to claim 2, characterized in that: The length of the wing strip is 15 to 20 μm.

7. The GIS sealing structure according to claim 2, characterized in that: The cross-section of the wing strip is semicircular or polygonal.

8. The GIS sealing structure according to claim 1, characterized in that: The opening direction of the first V-shaped sealing strip is the same as the leakage direction of the insulating gas, and the opening direction of the second V-shaped sealing strip is opposite to the leakage direction of the insulating gas.

9. The GIS sealing structure according to claim 1, characterized in that: The distance between two adjacent first V-shaped sealing strips and the distance between two adjacent second V-shaped sealing strips are 5 to 8 μm.

10. A GIS, characterized in that: The GIS sealing structure comprises any one of claims 1 to 9, wherein the groove is arranged at the joint of the GIS casing.

Images