SF6 electrical equipment inflation universal joint

Abstract

The utility model provides an inflation universal joint for SF6 electrical equipment. The inflation universal joint comprises a connecting component (2), a sealing component (3) and an inflation component (4), the sealing part (3) is connected between the connecting part (2) and the inflating part (4); the connecting part (2) is used for being connected with an electrical equipment inflation inlet (1), a nut sliding block (22) is arranged at the end, connected with the electrical equipment inflation inlet (1), of the connecting part (2) in the circumferential direction, and connecting internal threads (221) matched with connecting threads (11) of the electrical equipment inflation inlet are arranged on the inner face of the nut sliding block (22). According to the technical scheme, through matching with the nut sliding blocks with different screw pitches, inflation inlet threads of electrical equipment interfaces M20-M45 are adapted.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary devices for electrical equipment, and in particular to a universal inflatable connector for SF6 electrical equipment. Background Technology

[0002] With the rapid and steady development of the power system, the use of electrical equipment using SF6 gas as an insulating medium is increasing rapidly. The daily operation and maintenance of SF6 electrical equipment in substations requires a large amount of work including SF6 gas filling, replenishment, and sampling testing.

[0003] However, there are numerous manufacturers of SF6 electrical equipment, each with its own inflation interface standards. Currently, there are over a dozen types of inflation ports for mainstream SF6 electrical equipment, with a wide range of thread sizes from M20 to M45, and thread pitches of 1.5mm and 2mm. Substations need to be equipped with various specialized inflation connectors, which presents significant drawbacks.

[0004] Disadvantage 1: There are many dedicated air inflator connectors, and all connectors need to be carried for each maintenance operation;

[0005] Disadvantage 2: The numerous connectors make them prone to confusion and loss, which is not conducive to use and management;

[0006] Disadvantage 3: Numerous specialized connectors result in high procurement costs, making it uneconomical;

[0007] Disadvantage 4: The existing dedicated connector's push rod is built-in and pre-adjusted in length. The sealing and push rod advancement are synchronized with the thread tightening process. When connecting to the air inlet of electrical equipment, two unfavorable situations can easily occur: First, if the push rod extension length is adjusted too far, the air inlet check valve will be opened before the connector connection and sealing are in place, causing air leakage; when the connection and sealing are in place, the check valve will be over-opened, which can easily damage the check valve. Second, if the push rod extension length is not adjusted enough, the check valve will not be opened after the connector connection and sealing are in place, making air inflation impossible. Utility Model Content

[0008] In view of this, the purpose of this utility model is to provide a universal inflatable connector for SF6 electrical equipment, which can be adapted to the inflation port threads of electrical equipment interfaces M20-M45 by matching nut sliders with different pitches.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: an SF6 electrical equipment inflation universal connector, including a connecting component (2), a sealing component (3), and an inflation component (4); the sealing component (3) is connected between the connecting component (2) and the inflation component (4); the connecting component (2) is used to connect the electrical equipment inflation port (1), and a nut slider (22) is provided circumferentially at one end of the connecting component (2) connected to the electrical equipment inflation port (1), and the inner surface of the nut slider (22) has a connecting internal thread (221) that matches the connecting thread (11) of the electrical equipment inflation port.

[0010] In a preferred embodiment, the connecting component (2) includes a fixed disk (21), a nut slider (22), a bearing (23), and a drive disk (24); the nut slider (22) is installed in the groove (211) of the fixed disk (21); the bottom surface of the nut slider (22) is a first planar thread (222), which meshes with the second planar thread (241) on the front end face of the drive disk (24). When the drive disk (24) is rotated, the drive disk (24) will drive the nut slider (22) to slide radially along the groove (211).

[0011] In a preferred embodiment, the outer circular surface of the bearing (23) is interference-fitted with the inner hole of the fixed disk (21), and the inner circular surface of the bearing (23) is interference-fitted with the outer cylindrical surface of the drive disk (24). The fixed disk (21), the bearing (23) and the drive disk (24) are tightly connected after assembly. One end of the fixed disk facing the drive disk (24) extends into a cylindrical structure. The end of the cylindrical structure is provided with an external thread, and the side of the cylindrical structure is provided with a keyway (212) in a direction parallel to its central axis.

[0012] In a preferred embodiment, the sealing component (3) includes an end face sealing gasket (31), a sealing head (32), a limiting key (33), and a sealing nut (34); one end of the sealing head (32) is cylindrical, and a relief groove is provided on the cylindrical shape. The limiting key (33) is installed in the relief groove of the sealing head (32), so that the entire sealing component (3) can move axially along the keyway (212) in the inner hole of the fixed plate (21), while restricting its circumferential rotation.

[0013] In a preferred embodiment, the end face sealing gasket (31) is installed in the sealing groove on the front end face of the sealing head (32). When the connecting component (2) is connected to the air inlet (1) of the electrical equipment, and the sealing nut (34) is connected to the external thread at the end of the fixing plate (21) and tightened, the entire sealing component (3) moves toward the air inlet (1) of the electrical equipment until the end face sealing gasket (31) presses against the sealing boss (12) of the air inlet of the electrical equipment to form a seal.

[0014] In a preferred embodiment, the inflation component (4) includes a push rod (41), an O-ring (42), a push rod nut (43), and a self-sealing quick-connect male connector (44); two O-rings (42) are installed on the push rod (41), and the push rod (41) is inserted into the inner hole of the sealing head (32) to form a radial seal with the inner hole of the sealing head (32) through the O-rings (42).

[0015] In a preferred embodiment, after the connecting component (2) is connected to the air inlet (1) of the electrical equipment, and after the sealing component (3) is pressed against the sealing boss (12) of the air inlet to form a seal, the push rod nut (43) is connected to the external thread at the rear end of the sealing head and tightened, which drives the air inlet component (4) to move forward and open the check valve (13) of the air inlet of the electrical equipment.

[0016] In a preferred embodiment, the rear end face of the push rod (41) is connected to a self-sealing quick-connect male connector (44).

[0017] In a preferred embodiment, the top rod (41) has a vent hole in the middle. Gas is filled into the self-sealing quick connector, and after passing through the middle vent hole, it flows out through the side hole in the middle part of the top rod (41), and enters the electrical equipment along the gap between the top rod (41) and the inner hole of the sealing head (32).

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Wide range of connections, compatible with M20-M45 air inlet threads of electrical equipment interfaces;

[0020] 2. It is economical and can replace various existing special air inflator connectors, reducing procurement costs;

[0021] 3. Easy to carry, reducing the amount of work involved in managing connectors;

[0022] 4. The claw-type structure clamps the three nuts and sliders simultaneously, preventing eccentricity during connection and thus avoiding damage to the push rod and check valve;

[0023] 5. Nut sliders with different pitches are easy to replace; they can be replaced and installed by rotating the drive disc.

[0024] 6. The threaded connection, sealing, and jacking inflation are performed separately, and each function can be reliably implemented;

[0025] 7. The jacking length can be adjusted externally to solve the problems of insufficient or excessive jacking;

[0026] 8. The universal connector is designed with double limits to protect the connector itself and the air inlet of the electrical equipment: the length of the keyway in the inner hole of the fixed plate is limited to prevent the sealing component from being over-screwed and damaging the end face gasket; the length of the sealing hole in the middle of the sealing head that mates with the push rod is limited to prevent the push rod from being over-pushed and damaging the air inlet check valve. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the universal connector according to a preferred embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the air inlet structure for electrical equipment;

[0029] Figure 3 This is a schematic diagram of the connecting component structure of a preferred embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the sealing component structure according to a preferred embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the inflatable component structure of a preferred embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the airflow direction in a preferred embodiment of the present invention;

[0033] Figure 7 This is a cross-sectional view of the universal connector according to a preferred embodiment of the present invention;

[0034] Diagram labels: 1. Electrical equipment air inlet, 11. Air inlet connecting thread, 12. Air inlet sealing boss, 13. Check valve, 2. Connecting component, 21. Fixed plate, 211. Slide groove, 212. Keyway, 22. Nut slider, 221. Connecting internal thread, 222. First plane thread, 23. Bearing, 24. Drive plate, 241. Second plane thread, 31. End face sealing gasket, 32. Sealing head, 33. Limit key, 34. Sealing nut, 41. Push rod, 42. O-ring, 43. Push rod nut, 44. Self-sealing quick-connect male connector. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application; as used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise; furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] A universal inflatable connector for SF6 electrical equipment, reference Figure 1-7 The device comprises a connecting component 2, a sealing component 3, and an inflation component 4. The connecting component 2 is used to connect to the inflation port 1 of the electrical equipment. Specifically, the connecting component 2 is connected to the connecting thread 11 of the inflation port of the electrical equipment. The sealing component 3 is used to seal between the universal connector and the sealing boss 12 of the inflation port of the electrical equipment. One end of the inflation component 4 is used to open the check valve 13 of the inflation port of the electrical equipment, and the other end is used to connect to the inflation pipe.

[0039] refer to Figure 3 The connecting component 2 consists of four parts: a fixed plate 21, three nut sliders 22, a bearing 23, and a drive plate 24.

[0040] The outer circular surface of bearing 23 is interference-fitted with the inner hole of fixed disk 21, and the inner circular surface of bearing 23 is interference-fitted with the outer cylindrical surface of drive disk 24. The three are tightly connected after assembly.

[0041] The inner surface of the nut slider 22 has a connecting internal thread 221 that matches the connecting thread 11 of the air inlet. The three nut sliders 22 are installed in the slide groove 211 of the fixed plate 21.

[0042] The bottom surface of the nut slider 22 is a first planar thread 222, which meshes with the second planar thread 241 on the front end face of the drive disk 24. When the drive disk 24 is rotated, the drive disk 24 will drive the three nut sliders 22 to slide radially along the slide groove 211 in sync, thereby expanding or shrinking the connection diameter to adapt to the air inlet of electrical equipment of different sizes.

[0043] The connection threads of the air inlet of electrical equipment have two pitches: 1.5mm and 2mm. Nut sliders with the two pitches are machined respectively, and can be used interchangeably according to the actual needs on site.

[0044] refer to Figure 4 The sealing component 3 consists of four parts: end face sealing gasket 31, sealing head 32, limit key 33, and sealing nut 34.

[0045] The limiting key 33 is installed in the groove on the cylindrical surface of the sealing head 32, so that the entire sealing component 3 can move axially along the keyway 212 in the inner hole of the fixed plate 21, while restricting its circumferential rotation.

[0046] The end face sealing gasket 31 is installed in the sealing groove on the front end face of the sealing head. When the connecting component 2 is connected to the air inlet 1 of the electrical equipment, and the sealing nut 34 is connected to the external thread at the rear end of the fixing plate 21 and tightened, it drives the entire sealing component 3 to move toward the air inlet 1 of the electrical equipment until the end face sealing gasket 31 presses against the sealing boss 12 of the air inlet to form a seal.

[0047] refer to Figure 5 The inflation component 4 consists of four parts: a push rod 41, an O-ring 42, a push rod nut 43, and a self-sealing quick-connect male connector 44.

[0048] Two O-rings 42 are installed on the push rod 41. The push rod 41 is inserted into the inner hole of the sealing head 32, and a radial seal is formed between the O-rings 42 and the inner hole of the sealing head 32.

[0049] After the connecting component 2 is connected to the air inlet 1 of the electrical equipment, and the sealing component 3 is pressed against the sealing boss 12 of the air inlet to form a seal, the push rod nut 43 is connected to the external thread at the rear end of the sealing head and tightened, which drives the air inlet component 4 to move forward and open the air inlet check valve (13). The push pin can fully open the check valve by pushing forward 4-5mm.

[0050] The rear end face of the push rod 41 is connected to the self-sealing quick-connect male connector 44. The self-sealing quick-connect male connector is in a sealed state when not connected, and is conductive when connected to the self-sealing quick-connect female connector.

[0051] The push rod 41 has a vent hole in the middle. Gas is introduced through the self-sealing quick-connect connector, flows out through the vent hole, exits through the side hole in the middle part of the push rod, and travels along the gap between the push rod and the inner hole of the sealing head, entering the electrical equipment (see below). Figure 6 (As indicated by the arrow).

[0052] The steps for using this universal connector are as follows:

[0053] 1) The fixed disk 21, bearing 23, and drive disk 24 are interference-fitted to form a whole;

[0054] 2) Select three nut sliders 22 with the same pitch and insert them into the grooves on the fixed plate 21 respectively. Rotate the drive plate 24 counterclockwise. Through the mutual meshing of the planar threads of the drive plate 24 and the nut sliders 22, the nut sliders 22 are driven to move towards the center along the grooves.

[0055] 3) When connecting the air inlet 1 of the electrical equipment, adjust the opening of the nut slider 22 to be slightly larger than the connecting thread 11 of the air inlet; then align the two threads and rotate the drive disk 24 counterclockwise until the connecting internal thread of the nut slider and the connecting thread of the air inlet are tightly engaged.

[0056] 4) If you need to connect to an air inlet thread with a different pitch, simply rotate the drive disc 24 clockwise. The three nut sliders 22 will slide outward along the groove until they can be removed. Then replace them with the corresponding nut sliders 22.

[0057] 5) Install the sealing component 3, insert the sealing component 3 into the inner hole of the fixed plate 21, align the limit key 33 with the keyway of the inner hole of the fixed plate 21, connect the sealing nut 34 and the external thread at the rear end of the fixed plate 21 until the end face sealing gasket 31 at the front end of the sealing component 3 is pressed against the air inlet sealing boss 12 to form a seal.

[0058] 6) Assemble the inflation component 4, insert it into the inner hole of the sealing component 3, connect the top rod nut 43 to the external thread at the rear end of the sealing head 32, and tighten it. When you feel that it is difficult to tighten, it means that the top rod 41 has reached the inflation port check valve. At this time, screw the top rod nut in about 3 turns (about 5mm) to fully open the inflation port check valve, and the universal connector can be connected to the electrical equipment.

[0059] 7) After the universal connector is installed in place, insert the air tube with the self-sealing quick-connect female connector into the self-sealing quick-connect male connector 44 on the universal connector, and you can start the inflation operation.

[0060] 8) After inflation is complete, disconnect the inflation tube from the self-sealing quick-connect male connector 44, and then loosen the connection between the push rod nut 43 and the external thread at the rear end of the sealing head 32, so that the check valve at the inflation port of the electrical equipment re-seals the inflation port.

[0061] 9) Loosen the connection between the sealing nut 34 and the external thread at the rear end of the fixing plate 21, without completely unscrewing it; then rotate the drive plate 24 clockwise to open the nut slider 22, and the universal connector can be removed.

[0062] 10) Clean up the site after removing the connector.

Claims

1. A universal inflatable connector for SF6 electrical equipment, characterized in that, It includes a connecting component (2), a sealing component (3), and an inflation component (4); the sealing component (3) is connected between the connecting component (2) and the inflation component (4); the connecting component (2) is used to connect the air inlet (1) of the electrical equipment, and a nut slider (22) is provided circumferentially at one end of the connecting component (2) connected to the air inlet (1) of the electrical equipment, and the inner surface of the nut slider (22) has a connecting internal thread (221) that matches the connecting thread (11) of the air inlet of the electrical equipment.

2. The universal inflatable connector for SF6 electrical equipment according to claim 1, characterized in that, The connecting component (2) includes a fixed disk (21), a nut slider (22), a bearing (23), and a drive disk (24); the nut slider (22) is installed in the groove (211) of the fixed disk (21); the bottom surface of the nut slider (22) is a first planar thread (222), which meshes with the second planar thread (241) on the front end face of the drive disk (24). When the drive disk (24) is rotated, the drive disk (24) will drive the nut slider (22) to slide radially along the groove (211).

3. The universal inflatable connector for SF6 electrical equipment according to claim 2, characterized in that, The outer circular surface of the bearing (23) is interference-fitted with the inner hole of the fixed disk (21), and the inner circular surface of the bearing (23) is interference-fitted with the outer cylindrical surface of the drive disk (24). The fixed disk (21), the bearing (23) and the drive disk (24) are tightly connected after assembly. One end of the fixed disk facing the drive disk (24) extends into a cylindrical structure. The end of the cylindrical structure is provided with an external thread, and the side of the cylindrical structure is provided with a keyway (212) in a direction parallel to its central axis.

4. The universal inflatable connector for SF6 electrical equipment according to claim 3, characterized in that, The sealing component (3) includes an end face sealing gasket (31), a sealing head (32), a limiting key (33), and a sealing nut (34); one end of the sealing head (32) is cylindrical, and a relief groove is provided on the cylindrical part. The limiting key (33) is installed in the relief groove of the sealing head (32), so that the entire sealing component (3) can move axially along the keyway (212) in the inner hole of the fixed plate (21), while restricting its circumferential rotation.

5. The universal inflatable connector for SF6 electrical equipment according to claim 4, characterized in that, The end face sealing gasket (31) is installed in the sealing groove on the front end face of the sealing head (32). When the connecting component (2) is connected to the air inlet (1) of the electrical equipment, and the sealing nut (34) is connected to the external thread at the end of the fixing plate (21) and tightened, the entire sealing component (3) moves toward the air inlet (1) of the electrical equipment until the end face sealing gasket (31) presses against the sealing boss (12) of the air inlet of the electrical equipment to form a seal.

6. The universal inflatable connector for SF6 electrical equipment according to claim 5, characterized in that, The inflation component (4) includes a push rod (41), an O-ring (42), a push rod nut (43), and a self-sealing quick-connect male connector (44); two O-rings (42) are installed on the push rod (41), and the push rod (41) is inserted into the inner hole of the sealing head (32), forming a radial seal with the inner hole of the sealing head (32) through the O-rings (42).

7. The universal inflatable connector for SF6 electrical equipment according to claim 6, characterized in that, After the connecting component (2) is connected to the air inlet (1) of the electrical equipment, and the sealing component (3) is pressed against the sealing boss (12) of the air inlet to form a seal, the top rod nut (43) is connected to the external thread at the rear end of the sealing head and tightened, which drives the air inlet component (4) to move forward and open the check valve (13) of the air inlet of the electrical equipment.

8. The universal inflatable connector for SF6 electrical equipment according to claim 7, characterized in that, The rear end face of the top rod (41) is connected to a self-sealing quick-connect male connector (44).

9. A universal inflatable connector for SF6 electrical equipment according to claim 8, characterized in that, The top rod (41) has a vent hole in the middle. Gas is filled into the self-sealing quick connector, and after passing through the middle vent hole, it flows out through the side hole in the middle part of the top rod (41), and enters the electrical equipment along the gap between the top rod (41) and the inner hole of the sealing head (32).

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