Small-angle beveled GIL structure

Abstract

The utility model discloses a small-angle beveling GIL structure, and belongs to the technical field of GIL pipelines. Comprising a first pipeline and a second pipeline, flanges are arranged on the opposite sides of the first pipeline and the second pipeline and fixed through flange fixing bolts, a contact and an HM contact sleeve which can be connected with a GIL multi-phase line are arranged in the opposite sides of the first pipeline and the second pipeline respectively, the first pipeline is subjected to beveling treatment, and the second pipeline is subjected to beveling treatment. The offset included angle between the axis of the first pipeline and the axis of the second pipeline ranges from 0 degree to 2 degrees; an HM contact finger is arranged on the inner wall of the HM contact sleeve, the contact extends into the HM contact sleeve and is connected with the HM contact finger to form a path, and the deviation angle range of the axis of the contact in the HM contact sleeve is 0-3 degrees. According to the small-angle beveled GIL structure provided by the utility model, the application of angle folding equipment at the folding point is reduced, the cost of GIL equipment accessories is reduced, the number of field installation GIL equipment is reduced, the installation efficiency is improved, the number of field butt joint surfaces is also reduced, and the air leakage rate of the GIL equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of GIL pipelines, and more specifically to a small-angle beveled GIL structure. Background Art

[0002] With the rapid expansion and vigorous development of my country's ultra-high voltage (UHV) power grid, my country's power grid will make the leap from ultra-high voltage to ultra-high voltage (UHV). In the UHV transmission and transformation system, the safety and reliability of gas-insulated GIL (German Interconnection) equipment is the foundation for the stable operation of the UHV power grid. Currently, the layout of GIL equipment is based on the installation of tunnels or shield tunnels. These tunnels or shield tunnels are subject to the constraints of the geographical environment and soil conditions, resulting in small slopes and small corners in tunnels and large arcs and small slopes in shield tunnels. When laying out GIL equipment, small slopes or large arcs must be made to accommodate these special environments. Therefore, a large number of angle-folding devices, such as right-angle heads or bellows, are required. Otherwise, the GIL equipment pipeline connections are prone to air leakage, but adding angle-folding devices will significantly increase costs.

[0003] Based on the above problems, we propose a small-angle bevel GIL structure, which is suitable for the problem of small slope corners in tunnel or shield pipeline corridor laying. By solving the problem of small slope corners without the need for corner bending equipment, we can reduce costs and reduce the leakage rate of GIL equipment. Utility Model Content

[0004] In order to overcome the technical problems raised in the above background, the utility model provides a small-angle beveled GIL structure.

[0005] In order to solve the above technical problems, the technical solutions of the present utility model are as follows:

[0006] A small-angle beveled GIL structure includes a first pipeline and a second pipeline. Flanges are provided on opposite sides of the first pipeline and the second pipeline, and the flanges are fixed to the first pipeline and the second pipeline by flange fixing bolts. Contacts and HM contact sleeves that can be connected to the GIL multi-phase line are respectively provided inside the opposite sides of the first pipeline and the second pipeline. The first pipeline is beveled, and the angle between its axis and the axis of the second pipeline is offset by an angle ranging from 0° to 2°. HM contact fingers are provided on the inner wall of the HM contact sleeve. The contacts extend into the HM contact sleeve and connect with the HM contact fingers to form a passage. The contact axis is offset by an angle ranging from 0° to 3° inside the HM contact sleeve.

[0007] Preferably, the HM contact sleeve includes a first sleeve with one end sleeved on the contact, and a second sleeve flexibly connected to the other end of the first sleeve.

[0008] Further preferably, a movable groove is provided in a circle inside one end of the second kit close to the first kit, and a plurality of HM contact fingers are evenly arranged inside the movable groove. An elastic reset member for resetting the HM contact fingers is provided inside the movable groove, and one end of the elastic reset member is connected to the HM contact finger, and the other end is clamped in a positioning member fixedly provided on the inner wall of the movable groove.

[0009] Preferably, a sealing ring installation groove is reserved inside the flange that is arranged opposite to the first pipeline and the second pipeline, and a sealing ring is arranged inside the sealing ring installation groove.

[0010] Further preferably, the sealing ring installation groove and the sealing ring are provided with two.

[0011] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0012] The utility model provides a small-angle beveled GIL structure, which is suitable for performing small-slope bends in some special environments. By beveling one of the two connected GIL pipelines, the bevel angle is maintained between 0° and 2°. In order to cope with the small-angle beveled installation method, the contacts and HM contact sleeves inside the GIL pipeline can ensure that the active tilt range is 0° to 3°, thereby reducing the impact of the GIL pipeline bevel on the internal contacts and HM contact sleeves. Compared with the existing GIL pipeline, this GIL pipeline installation method with pre-bevel compensation can meet the application of GIL equipment in small-angle projects, and can also reduce the number of GIL equipment in the overall project, further shortening the GIL installation period. At the same time, a sealing ring is provided at the joint position of the GIL pipeline flange to reduce the leakage rate of the GIL equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0015] Figure 2 For this utility model Figure 1 A in the middle is an enlarged structural diagram;

[0016] Figure 3 For this utility model Figure 1 The enlarged structural diagram at B in the middle;

[0017] Figure 4 For this utility model Figure 3 Enlarged structural diagram at point C in the middle.

[0018] Explanation of the marks in the figure: 1. First pipeline; 2. Second pipeline; 3. Contact; 4. HM contact sleeve; 5. Flange; 6. Flange fixing bolt; 7. Sealing ring installation groove; 8. Sealing ring; 9. HM contact finger; 10. Movable groove; 11. Elastic reset part; 12. Positioning part. DETAILED DESCRIPTION

[0019] In order to better understand the purpose, structure and function of the present invention, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific preferred embodiments.

[0020] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper", "lower", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They 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. "First", "second", etc. do not indicate the importance of the components, and therefore cannot be understood as limiting the present invention. The specific dimensions used in the embodiments are only for illustrating the technical solution and do not limit the scope of protection of the present invention. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0021] Unless otherwise expressly specified or limited, terms such as "installed," "installed," "connected," and "fixed" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0022] Example 1:

[0023] See also Figure 1-4 The present application provides a small-angle bevel GIL structure, including a first pipeline 1 and a second pipeline 2. A flange 5 is provided on the opposite side of the first pipeline 1 and the second pipeline 2. The flange 5 fixes the first pipeline 1 and the second pipeline 2 by flange fixing bolts 6. The insides of the first pipeline 1 and the second pipeline 2 on the opposite side are respectively provided with a contact 3 and an HM contact sleeve 4 that can be connected to the GIL multi-phase line. According to installation requirements, one of the contact 7 and the connector 8 needs to extend out of the pipeline, such as Figure 1As shown, the contact 7 extends toward a portion of the connector 8, so that the contact 7 can be inserted into the connector 8 when the two pipelines are connected. The specific extension size is best to keep the inflection point of the contact 7 at the center of the connector 8.

[0024] The first pipeline 2 is beveled, and the offset angle between its axis and the axis of the second pipeline 1 is between 0° and 2°; the inner wall of the HM contact sleeve 4 is provided with HM contact fingers 9, and the contact 3 extends into the HM contact sleeve 4 and is connected to the HM contact fingers 9 to form a passage. The offset angle of the axis of the contact 3 inside the HM contact sleeve 4 is between 0° and 3°.

[0025] In this embodiment, the first pipeline 1 is beveled, and the upper angle between the first pipeline 1 and the second pipeline 2 has a bending range of 2°. Figure 1 As shown, the left flange 3 of the first pipeline 1 is vertically parallel to the flange 3 of the second pipeline 2, and the first pipeline 1 is pre-treated and bent at a certain angle by compensation, so that the entire GIL pipeline can pass through some small angles after installation without the need to set up right-angle units or bellows, thereby reducing installation costs and improving installation efficiency.

[0026] More specifically, after the GIL pipeline is beveled and installed, the contacts 3 inside the first pipeline 1 and the second pipeline 2 need to be adjusted to extend into the HM contact sleeve 4. After the contacts 3 are inserted into the HM contact sleeve 4, they can be bent within a deviation of 3° in all directions to adapt to the impact of the overall bevel of the first pipeline 1 and the second pipeline 2, ensuring that the bevel of the external pipeline does not affect the connection of the internal circuit.

[0027] It should be noted that Figure 1 Only one oblique upward scenario is provided. In specific applications, the oblique direction of the first pipeline 1 is changed according to actual needs. At the same time, in order to cooperate with the adjustment of the oblique direction of the pipeline, the internal space of the HM contact sleeve 4 in this embodiment needs to ensure that the contact 7 can be tilted in any direction within 3° inside the HM contact sleeve 4.

[0028] It should be noted that in order to connect more GIL pipelines, in the first pipeline 1 and the second pipeline 2, the contacts 3 and the HM contact sleeves 4 are set at both ends, that is, the contacts 3 and the HM contact sleeves 4 are set at both ends of the first pipeline 1, and are connected in the middle by an aluminum alloy conductor; the contacts 3 and the HM contact sleeves 4 are also set at both ends of the second pipeline 2, and are connected in the middle by an aluminum alloy conductor. Specifically, a small inclination angle is required, and then a bevel treatment is adopted.

[0029] Based on the above embodiment, Figure 4As shown, the HM contact sleeve 4 includes a first kit with one end sleeved on the contact 3, and a second kit flexibly connected to the other end of the first kit. The connection between the first kit and the second kit is located at the folding point of the contact 3 and the HM contact sleeve 4 to ensure that when the contact 3 deviates inside the HM contact sleeve 4, the connection position of the first kit and the second kit can adaptively adjust the folding angle.

[0030] Based on the above embodiment, Figure 4 As shown, a movable groove 10 is provided in a circle inside one end of the second kit close to the first kit, and a plurality of HM contact fingers 9 are evenly arranged inside the movable groove 10. An elastic reset member 11 for resetting the HM contact fingers 9 is provided inside the movable groove 10. One end of the elastic reset member 11 is connected to the HM contact finger 9, and the other end is clamped in a positioning member 12 fixedly provided on the inner wall of the movable groove 10.

[0031] Example 2:

[0032] Aiming at the problem that the existing GIL pipeline is prone to leakage at the connection position, such as Figure 2 As shown, a sealing ring installation groove 7 is reserved inside the flange 5 arranged opposite to the first pipeline 1 and the second pipeline 2. A sealing ring 8 is arranged inside the sealing ring installation groove 7. There are two sealing ring installation grooves 7 and sealing rings 8. In this embodiment, by providing the sealing ring 8, the leakage rate of the GIL equipment can be reduced.

[0033] It should be noted that, in this embodiment, since the flanges 5 of the first pipeline 1 and the second pipeline 2 are bent, the sealing ring installation groove 7 is preferably provided on one surface of the two oppositely arranged flanges 5, such as Figure 2 As shown, the sealing ring installation groove 7 is set on the second pipeline 2, and the sealing ring installation groove 7 is opened on the opposite surfaces of the two flanges 5. Opening a groove on a single surface can ensure that when the flange 5 is installed, the extrusion deformation of the sealing ring 8 is increased, so that the sealing ring 8 can be interference filled in the sealing ring installation groove 7 to ensure the sealing effect.

[0034] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A small-angle bevel GIL structure, comprising a first pipeline (1) and a second pipeline (2), wherein a flange (5) is provided on one side opposite to the first pipeline (1) and the second pipeline (2), the flange (5) fixing the first pipeline (1) and the second pipeline (2) by means of flange fixing bolts (6), and a contact (3) and an HM contact sleeve (4) for connecting to a GIL multi-phase circuit are provided inside the first pipeline (1) and the second pipeline (2), respectively, and characterized in that: The first pipeline (1) is beveled, and the offset angle between its axis and the axis of the second pipeline (2) is between 0° and 2°; the inner wall of the HM contact sleeve (4) is provided with an HM contact finger (9), the contact (3) extends into the HM contact sleeve (4) and is connected to the HM contact finger (9) to form a passage, and the offset angle of the axis of the contact (3) inside the HM contact sleeve (4) is between 0° and 3°.

2. The low-angle beveled GIL structure according to claim 1, characterized in that: The HM contact sleeve (4) comprises a first sleeve having one end sleeved on the contact (3), and a second sleeve flexibly connected to the other end of the first sleeve.

3. The low-angle beveled GIL structure according to claim 2, characterized in that: A movable groove (10) is provided in a circle inside one end of the second set close to the first set, and a plurality of HM contact fingers (9) are evenly arranged inside the movable groove (10). An elastic reset member (11) for resetting the HM contact fingers (9) is provided inside the movable groove (10), one end of the elastic reset member (11) is connected to the HM contact finger (9), and the other end is clamped in a positioning member (12) fixedly provided on the inner wall of the movable groove (10).

4. The low-angle beveled GIL structure according to claim 1, characterized in that: A sealing ring installation groove (7) is reserved inside the flange (5) arranged opposite to the first pipeline (1) and the second pipeline (2), and a sealing ring (8) is arranged inside the sealing ring installation groove (7).

5. The low-angle beveled GIL structure according to claim 4, characterized in that: The sealing ring installation groove (7) and the sealing ring (8) are provided in two rows.

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