Insulating sleeve for gas insulated switchgear and power distribution switch system

Abstract

The invention belongs to the technical field of gas insulated switch devices, and particularly provides an insulating sleeve for a gas insulated switchgear and a power distribution switch system. The insulating sleeve comprises an insulating pouring body embedded with a conductive rod, the insulating pouring body is provided with a connecting part, one end of the connecting part is used for being in sealed connection with one of the two adjacent gas-filled cabinets, the other end of the connecting part is in sealed connection with a corrugated pipe, and one end, deviating from the connecting part, of the corrugated pipe is used for being in sealed connection with the other one of the two adjacent gas-filled cabinets. And the interior of the corrugated pipe can be communicated with an air chamber of the inflatable cabinet. The power distribution switch system comprises the insulating sleeve. When each gas-insulated switchgear is connected in a combined manner, even if a certain error exists, the error can be compensated through the deformation of the corrugated pipe, and the sealing performance of the gas chamber can still be ensured after the corrugated pipe is deformed, so that the sealing reliability of the insulating sleeve is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas insulated switchgear, and in particular relates to an insulating bushing for a gas-filled cabinet and a power distribution switch system. Background Art

[0002] In the construction of distribution stations, in order to achieve basic control and protection functions, it is often necessary to connect multiple gas-filled cabinets together. The connection of the busbars between cabinets requires the use of insulating sleeves to ensure insulation and sealing performance inside and outside the cabinet (gas box).

[0003] At present, the commonly used insulating sleeve is an inverted cone plug-in structure. For example, the utility model patent with authorization announcement number CN207010149U discloses an insulating sleeve, which includes an inner connector and an outer connector that are separated into inner and outer parts. The inner and outer connectors are both insulating cast bodies, and the outer connector is embedded with a conductive rod, and the inner connector is embedded with a plum blossom contact. The inner connector can be sealed and connected to the inner side of the cabinet, and the outer connector can be sealed and connected to the outer side of the cabinet. The inner and outer connectors are plug-in matched, and the plug-in match includes the plug-in between the conductive rod and the plum blossom contact and the plug-in between the insulating cast bodies.

[0004] The above-mentioned insulating sleeve ensures a good seal between the insulating sleeve and one of the inflatable cabinets. When the cabinets are connected, the other end of the external connector needs to be inserted into another inflatable cabinet. Ideally, since the external connector is a conical structure, it can be plugged into the reserved through hole on the cabinet to ensure the seal. However, due to the influence of the accuracy of the on-site foundation and the overall frame of the equipment, there is an error in the position between two adjacent inflatable cabinets. Although the current level can control the error within a small range, the inverted cone plug-in insulating sleeve has too high requirements for plug-in accuracy. In the case of slight errors, it is difficult to reliably guarantee the insulation sealing performance. Summary of the invention

[0005] The purpose of the present invention is to provide an insulating bushing for an inflatable cabinet to solve the technical problem in the prior art that the insulating bushing has unreliable insulation and sealing performance when used in parallel cabinets. The purpose of the present invention is also to provide a power distribution switch system to solve the same technical problem.

[0006] To achieve the above purpose, the technical solution of the insulating sleeve for the inflatable cabinet provided by the present invention is: An insulating sleeve for an inflatable cabinet comprises an insulating cast body with a conductive rod embedded therein, the insulating cast body being provided with a connecting portion, one end of the connecting portion being used for sealing connection with one of two adjacent inflatable cabinets, and the other end being sealedly connected with a bellows, the end of the bellows facing away from the connecting portion being used for sealing connection with the other of the two adjacent inflatable cabinets, and the interior of the bellows being able to communicate with the air chamber of the inflatable cabinet.

[0007] As a further improvement, a connecting nut is embedded in the insulating cast body, and the threaded hole of the connecting nut is not covered by the insulating cast body, so that the connecting part is connected to the inflatable cabinet through the connecting nut and the bolt passing through the inflatable cabinet body.

[0008] As a further improvement, a shielding cylinder located outside the conductive rod is embedded in the insulating cast body, and the connecting nut is conductively connected to the shielding cylinder through a conductive member.

[0009] As a further improvement, the connection portion is provided with a sealing ring installation groove for installing the sealing ring, and each connecting nut is located on the inner side of the sealing ring installation groove.

[0010] As a further improvement, a plurality of connecting bolts are installed on the bellows, so that the bellows is connected to the inflatable cabinet by passing the connecting bolts through the inflatable cabinet body.

[0011] As a further improvement, a sealing ring installation groove for installing the sealing ring is provided on the bellows, and each connecting bolt is located on the inner side of the sealing ring installation groove.

[0012] As a further improvement, one end of the bellows and the connecting portion are an integrally cast structure.

[0013] As a further improvement, the bellows is a metal bellows with a set pressure bearing capacity.

[0014] The present invention is a pioneering invention, and its beneficial effects are: when the insulating sleeve of the present invention is used in parallel cabinets, under the action of the insulating cast body, the guide rod can be connected to the busbar to ensure basic insulation performance, and at the same time, one end of the connection part is sealed and connected to one of the gas cabinets, and is sealed and connected to another gas cabinet through a bellows, and the inside of the bellows is also connected to the air chamber of the gas cabinet. Since the bellows itself has a certain deformation and extension ability, when the gas cabinets are connected in parallel cabinets, even if there is a certain error, the error can be compensated by the deformation of the bellows itself, and the bellows can still ensure the sealing performance of the air chamber after deformation, thereby improving the sealing reliability of the insulating sleeve.

[0015] To achieve the above-mentioned purpose, the technical solution of the power distribution switch system provided by the present invention is: A distribution switch system includes at least two gas-filled cabinets, with an insulating sleeve connected between two adjacent gas-filled cabinets. The insulating sleeve includes an insulating cast body with a conductive rod embedded therein, and the insulating cast body is provided with a connecting portion. One end of the connecting portion is sealedly connected to one of the two adjacent gas-filled cabinets, and the other end is sealedly connected to a bellows. The end of the bellows facing away from the connecting portion is sealedly connected to the other of the two adjacent gas-filled cabinets, and the interior of the bellows can be communicated with the air chamber of the gas-filled cabinet.

[0016] As a further improvement, a connecting nut is embedded in the insulating cast body, and the threaded hole of the connecting nut is not covered by the insulating cast body, so that the connecting part is connected to the inflatable cabinet through the connecting nut and the bolt passing through the inflatable cabinet body.

[0017] As a further improvement, a shielding cylinder located outside the conductive rod is embedded in the insulating cast body, and the connecting nut is conductively connected to the shielding cylinder through a conductive member.

[0018] As a further improvement, the connection portion is provided with a sealing ring installation groove for installing the sealing ring, and each connecting nut is located on the inner side of the sealing ring installation groove.

[0019] As a further improvement, a plurality of connecting bolts are installed on the bellows, so that the bellows is connected to the inflatable cabinet by passing the connecting bolts through the inflatable cabinet body.

[0020] As a further improvement, a sealing ring installation groove for installing the sealing ring is provided on the bellows, and each connecting bolt is located on the inner side of the sealing ring installation groove.

[0021] As a further improvement, one end of the bellows and the connecting portion are an integrally cast structure.

[0022] As a further improvement, the bellows is a metal bellows with a set pressure bearing capacity.

[0023] The present invention belongs to an improved invention creation, and its beneficial effect is: when the insulating sleeve of the present invention is used in parallel cabinets, under the action of the insulating cast body, the basic insulation performance can be guaranteed after the guide rod is connected to the busbar, and at the same time, one end of the connection part is sealed and connected to one of the inflatable cabinets, and is sealed and connected to another inflatable cabinet through a bellows, and the inside of the bellows is also connected to the air chamber of the inflatable cabinet. Since the bellows itself has a certain deformation and extension ability, when the inflatable cabinets are connected in parallel cabinets, even if there is a certain error, the error can be compensated by the deformation of the bellows itself, and the bellows can still ensure the sealing performance of the air chamber after deformation, thereby improving the sealing reliability of the insulating sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an embodiment of an insulating sleeve for an inflatable cabinet in the present invention from one viewing angle; Figure 2 It is a structural schematic diagram of an embodiment of the insulating sleeve for an inflatable cabinet in the present invention at another viewing angle; Figure 3 It is a front view of an embodiment of an insulating sleeve for an inflatable cabinet in the present invention; Figure 4 It is a cross-sectional view of an embodiment of an insulating sleeve for an inflatable cabinet in the present invention; Figure 5 for Figure 4 A schematic diagram of the structure of the ground shielding assembly; Figure 6 It is a schematic diagram of the sealing connection position of the insulating sleeve embodiment for the inflatable cabinet in the present invention and one of the inflatable cabinets; Figure 7 It is a schematic diagram of the sealing connection position between the insulating sleeve embodiment of the inflatable cabinet of the present invention and another inflatable cabinet; Figure 8 A schematic diagram of the sealing connection position between the insulating sleeve embodiment of the inflatable cabinet and two adjacent inflatable cabinets in the present invention (nuts and bolts are omitted); Fig. 9 It is a schematic diagram of an embodiment of the insulating sleeve for an inflatable cabinet in the present invention when it is installed in a power distribution switch system.

[0025] Description of reference numerals: 1. Insulating cast body; 2. Conductive rod; 3. Bellows; 4. Connecting bolts; 5. Shielding tube; 6. Connecting nut; 7. Conductive connector; 8. Sealing ring; 100. First gas-filled cabinet; 101. Connecting part; 200. Second gas-filled cabinet; 300. Busbar; 400. Insulating sleeve. DETAILED DESCRIPTION

[0026] In order to improve the sealing performance of the inflatable cabinets when connected together, the basic technical concept of the present invention is to provide an insulating sleeve that can compensate for the position error between two adjacent inflatable cabinets. Specifically, the insulating cast body in the insulating sleeve can be directly sealed and connected to one of the inflatable cabinets, and sealed and connected to the other inflatable cabinet through a bellows. In this way, the present invention can use the deformation and ductility characteristics of the bellows to compensate for the position error between the two inflatable cabinets, thereby ensuring the sealing effect. Based on the above concept, the present invention is further described in detail in combination with the embodiments below.

[0027] Specific embodiments of the insulating sleeve for the inflatable cabinet provided by the present invention: As a basic implementation method, see Figure 1-Figure 4 The insulating sleeve includes an insulating casting body 1, in which a conductive rod 2 is embedded. Specifically, the insulating casting body 1 can be made of a commonly used epoxy resin. The insulating casting body 1 is provided with a connecting portion 101, such as Figure 8As shown, one end of the connection part 101 can be sealed and connected to the first gas cabinet 100 of the two adjacent gas cabinets, and the other end is connected to the bellows 3, and the position where the bellows 3 and the connection part 101 of the insulating cast body 1 are connected should be sealed. The other end of the bellows 3 away from the connection part 101 can be sealed and connected to the second gas cabinet 200 of the two adjacent gas cabinets. In order to ensure the normal deformation of the bellows 3, a gap within a set appropriate range is left between the bellows 3 and the insulating cast body 1. After the bellows 3 and the second gas cabinet 200 are sealed and connected, since the corresponding position of the second gas cabinet 200 is provided with a through hole, the space inside the bellows 3 is actually connected to the air chamber of the gas cabinet, and the insulating gas in the air chamber can enter between the bellows 3 and the insulating cast body 1, thereby ensuring the insulation performance.

[0028] Analysis of the above structure shows that when multiple inflatable cabinets are connected to form a distribution switch system, Fig. 9 As shown, taking the first gas-filled cabinet 100 and the second gas-filled cabinet 200 as an example, even if there is a certain (small) position error between the two, the above-mentioned insulating sleeve can still be used to achieve cabinet connection. Specifically, the connecting portion 101 of the insulating sleeve 400 can be sealed and connected to the first gas-filled cabinet 100 first, and then connected to the second gas-filled cabinet 200 through the bellows 3. When connected, the bellows 3 can be appropriately extended and deflected according to the actual position of the second gas-filled cabinet 200 to compensate for the position error and ensure normal sealing. On the basis of ensuring good insulation and sealing, the conductive rod 2 embedded in the insulating sleeve can be connected to the busbar 300 in the gas-filled cabinet to achieve cabinet connection.

[0029] Based on the above basic implementation, as a preferred implementation, Figure 2 and Figure 4 As shown, the insulating casting body 1 is embedded with a connecting nut 6. When casting the connecting nut 6, it is necessary to ensure that the threaded hole of the connecting nut 6 is not covered by the insulating casting body 1. The number of connecting nuts 6 can be flexibly set according to the actual needs of the connection and is not specifically limited here. When connecting the connecting portion 101 with the first inflatable cabinet 100, as shown in FIG. Figure 6 As shown (only threaded holes are shown as examples in the figure), bolts can be used to pass through the cabinet body of the first inflatable cabinet 100 and connect with the connecting nut 6, so as to achieve the connection between the cabinet body and the connecting part 101.

[0030] Of course, in other embodiments, those skilled in the art will understand that, in addition to using the embedded connecting nut 6, a bolt through hole for the bolt to pass through can also be provided in the connecting portion 101. When connecting, the bolt passes through the connecting portion 101 and the cabinet and is locked with a nut.

[0031] Taking into account the safety of the entire device, in a further preferred embodiment, as Figure 4 and Figure 5As shown, a shielding tube 5 is embedded in the insulating casting body 1, and the shielding tube 5 is located on the outside of the conductive rod 2, and the optimal position of the shielding tube 5 is coaxial with the conductive rod 2. Adding the shielding tube 5 can improve the surrounding electric field distribution and improve the withstand voltage level. At the same time, each connecting nut 6 is connected to the shielding tube 5 through a conductive connector 7. In this way, after the bolt 4 is connected, in conjunction with the grounding design of the gas cabinet, through the connection between the gas cabinet cabinet-bolt-connecting nut 6-conductive member-shielding tube 5, the internal high-voltage circuit forms a uniform grounding layer between the high and low voltage potential difference between the cabinet grounding, forming a uniform electric field, and improving the overall insulation performance of the product. It should be noted here that the conductive connector 7 can be a wire or a conductive rod, and the two ends of the conductive connector 7 can be welded to the connecting nut 6 and the shielding tube 5 respectively. During casting, the position of the connecting nut 6 needs to be ensured, and the conductive connector 7 can be bent and deformed to ensure that the connecting nut 6 can be smoothly aligned with the perforation on the gas cabinet for the bolt to pass through.

[0032] In another preferred embodiment, in order to facilitate the installation of the sealing ring 8, the connecting portion 101 is provided with a sealing ring installation groove, and the sealing ring 8 can be installed in the sealing ring installation groove. Figure 2 As shown, the connecting nut 6 is located inside the sealing ring installation groove. Like this, the same sealing ring 8 can seal all the leakage points that may leak, which is convenient and efficient.

[0033] Of course, those skilled in the art will understand that other forms may be used for the sealing between the connection part 101 and the cabinet body. For example, a sealing ring mounting groove may be provided on the inner side of the connecting nut 6. In this case, the sealing ring at this position may play a role in sealing between the connection part 101 and the cabinet body. However, the small holes at the positions of the bolts and the connecting nuts 6 may still have leakage problems. In this case, a small sealing ring may be provided at the position of each connecting nut 6 to ensure a good seal.

[0034] Considering the durability of currently available materials, the bellows 3 is preferably a metal bellows. Since the bellows 3 is connected to the air chamber, the bellows 3 needs to have a set pressure bearing capacity that meets the requirements. However, it should be noted that in other embodiments, the use of plastic bellows is not excluded.

[0035] Based on the above basic implementation, as a preferred implementation, Figure 1 , Figure 3 and Figure 4 As shown, a plurality of connecting bolts 4 are installed on the bellows 3. When the bellows 3 is connected to the inflatable cabinet, as shown in FIG. Figure 7As shown, the connecting bolts 4 can be inserted into the respective through holes on the gas cabinet body, and nuts can be used to connect the connecting bolts 4, thereby realizing the connection between the bellows 3 and the gas cabinet. Specifically, when a metal bellows is used, the connecting bolts 4 can be welded to the bellows 3. Of course, when a plastic bellows is used, the connecting bolts 4 can be integrally injection molded with the bellows 3, or the connecting bolts 4 can be bonded to the bellows 3.

[0036] In another preferred embodiment, in order to facilitate the installation of the sealing ring 8, a sealing ring installation groove for installing the sealing ring 8 is provided on the bellows 3, and each connecting bolt 4 is located inside the sealing ring installation groove. In this way, the same sealing ring 8 can seal all possible leakage points, which is convenient and efficient.

[0037] Similarly, those skilled in the art will understand that in order to achieve a seal between the bellows 3 and the cabinet body, other forms may also be used, such as providing a sealing ring installation groove on the inner side of the connecting bolt 4. In this case, the sealing ring installed in the sealing ring installation groove can perform basic sealing, but the small holes at the connecting bolt 4 and the nut may still leak. In this case, a small sealing ring may be provided at the position of each connecting bolt 4 to ensure a good seal.

[0038] Based on the above basic implementation, as a preferred implementation, Figure 4 As shown, one end of the bellows 3 and the connecting portion 101 are an integrally cast structure, that is, when casting the insulating casting body 1, one end of the bellows 3 can be integrally cast with the casting insulator, so that the casting molding can form a sealing structure, which is convenient for manufacturing and has good sealing performance.

[0039] Similarly, those skilled in the art will understand that in order to achieve a seal between the connecting portion 101 and the bellows 3, other forms may also be used, such as manufacturing the bellows 3 and the insulating cast body 1 separately, embedding a nut in the connecting portion 101, providing a bolt hole for the bolt to pass through in the bellows 3, connecting the bellows 3 with bolts, and providing a sealing ring between the end faces of the connection.

[0040] Specific embodiments of the power distribution switch system in the present invention: The distribution switch system includes at least two gas-filled cabinets, and an insulating sleeve is connected between two adjacent gas-filled cabinets, wherein the insulating sleeve has the same structure as the insulating sleeve recorded in the specific embodiment of the insulating sleeve for the above-mentioned gas-filled cabinet, and will not be described in detail here.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An insulating sleeve for an inflatable cabinet, characterized in that: It includes an insulating cast body with a conductive rod embedded therein, the insulating cast body is provided with a connecting portion, one end of the connecting portion is used for sealing connection with one of two adjacent inflatable cabinets, and the other end is sealed with a bellows, the end of the bellows facing away from the connecting portion is used for sealing connection with the other of the two adjacent inflatable cabinets, and the interior of the bellows can be communicated with the air chamber of the inflatable cabinet.

2. The insulating sleeve for an inflatable cabinet according to claim 1 is characterized in that: A connecting nut is embedded in the insulating cast body, and a threaded hole of the connecting nut is not covered by the insulating cast body, so that the connecting part is connected to the inflatable cabinet through the connecting nut and a bolt passing through the inflatable cabinet body.

3. The insulating sleeve for an inflatable cabinet according to claim 2 is characterized in that: A shielding cylinder located outside the conductive rod is embedded in the insulating cast body, and the connecting nut is conductively connected to the shielding cylinder through a conductive member.

4. The insulating sleeve for an inflatable cabinet according to claim 2 or 3, characterized in that: The connecting portion is provided with a sealing ring installation groove for installing the sealing ring, and each connecting nut is located at the inner side of the sealing ring installation groove.

5. The insulating sleeve for an inflatable cabinet according to any one of claims 1 to 3, characterized in that: A plurality of connecting bolts are installed on the bellows, and the bellows is connected to the inflatable cabinet by penetrating the connecting bolts into the inflatable cabinet body.

6. The insulating sleeve for an inflatable cabinet according to claim 5, characterized in that: The bellows is provided with a sealing ring installation groove for installing the sealing ring, and each connecting bolt is located at the inner side of the sealing ring installation groove.

7. The insulating sleeve for an inflatable cabinet according to any one of claims 1 to 3, characterized in that: One end of the corrugated pipe and the connecting part are an integrally cast structure.

8. The insulating sleeve for an inflatable cabinet according to any one of claims 1 to 3, characterized in that: The bellows is a metal bellows with a set pressure bearing capacity.

9. A power distribution switch system, comprising at least two gas-filled cabinets, wherein an insulating sleeve is connected between two adjacent gas-filled cabinets, wherein: The insulating sleeve is the insulating sleeve for the inflatable cabinet according to any one of claims 1 to 8.

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