A high voltage cable entry seal for a switchgear

Abstract

The application discloses a high-voltage cable incoming line sealing piece of a switch cabinet, relates to the technical field of switch cabinet sealing, and discloses a high-voltage cable incoming line sealing piece of a switch cabinet, which comprises a cabinet body and a sealing cover used for incoming line sealing of the cabinet body, a plurality of groups of high-voltage cable bodies are connected through the cabinet body, and the sealing cover is arranged on the outer side of the high-voltage cable bodies. Through the cooperation of the installation assembly, the first sealing assembly, the second sealing assembly and the pulling assembly, multiple and shrinkage extrusion type sealing of the high-voltage cable bodies after the connection is formed, the sealing is not strict due to the size deviation of the sealing ring and the high-voltage cable bodies is reduced, in addition, in the sealing process, the sealing ring in the sealing sleeve can be uniformly abutted against the outer side of the high-voltage cable bodies through the rotation connection assembly, the subsequent sealing effect is guaranteed, in addition, through the uniform abutment, the probability of local wear and aging of the sealing ring due to uneven force in the sealing process is reduced, and the sealing reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of switchgear sealing technology, specifically to a high-voltage cable inlet seal for switchgear. Background Technology

[0002] After the high-voltage cable is installed and connected to the switchgear, in order to achieve the sealing effect of the switchgear, the high-voltage cable and the switchgear cabinet are sealed by the inlet sealing component. During the sealing process, the sealing cover of the sealing component is installed on the switchgear cabinet. The high-voltage cable passes through the sealing sleeve of the sealing cover, and the sealing ring inside the sealing sleeve abuts against the outside of the high-voltage cable to achieve the purpose of sealing. During the sealing process, due to the wiring angle, some of the high-voltage cables installed may have an angular deviation between the actual connected high-voltage cable body and the axial direction of the sealing sleeve (see...). Figure 12 As illustrated in the diagram, the high-voltage cable is obliquely inserted. In the process of sealing, the oblique insertion of the cable will cause the sealing ring on the inclined side to be excessively squeezed and a gap to appear on the other side, which will not be able to fit evenly against the outer wall of the cable, thus affecting the sealing effect. In addition, the cable will be subjected to oblique force for a long time, which will continuously rub against the inner wall of the sealing ring and the sealing sleeve, accelerating the aging of the sealing ring and the wear of the sealing sleeve, shortening the service life of the sealing component, and significantly reducing the sealing reliability. To address this, we propose a high-voltage cable inlet seal for switchgear. Summary of the Invention

[0003] The purpose of this invention is to provide a high-voltage cable inlet seal for switchgear to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage cable inlet seal for a switchgear, comprising a cabinet and a sealing cover for sealing the inlet of the cabinet, wherein multiple sets of high-voltage cable bodies are connected through the cabinet, the sealing cover is sleeved on the outside of the high-voltage cable bodies, and a sealing sleeve for sealing the high-voltage cable bodies is provided inside the sealing cover, and further comprising: The mounting components are located between the sealing cover and the cabinet to assist in the installation and connection of the sealing cover on the cabinet. A rotary connection assembly is disposed between the sealing cover and the sealing sleeve to assist the sealing sleeve in being used at different angles on the sealing cover. The rotary connection assembly is provided with a first sealing assembly for sealing after rotational adjustment. In addition, a second sealing component is provided inside the sealing sleeve for sealing after the high-voltage cable body is passed through and connected. The sealing sleeve is provided with a pulling component for assisting in forcefully squeezing the second sealing component and a driving component for driving the pulling component. An inflation component for inflating and sealing the first sealing component is provided between the driving component and the first sealing component.

[0005] Preferably, the rotary connection assembly includes a spherical groove formed on the sealing cover, a rotating ball is rotatably connected inside the spherical groove, and the sealing sleeve is centrally fixed on the rotating ball.

[0006] Preferably, two sets of the second sealing components are symmetrically arranged on the inner side of the sealing sleeve. The second sealing component includes an annular mounting groove opened inside the sealing sleeve, and a sealing ring for sealing against the outer side of the high-voltage cable body is installed inside the annular mounting groove.

[0007] Preferably, the pulling assembly includes two sets of pull ropes wound around the outside of the sealing ring. The upper and lower sides of the sealing sleeve are provided with two sets of through holes for the ends of the pull ropes to pass through. The two ends of the pull ropes pass through the two sets of through holes respectively. The outer side of the sealing sleeve is provided with two sets of strip plates. The two ends of the pull ropes are fixed to the two sets of strip plates respectively. Multiple sets of T-shaped rods are slidably connected to the strip plates. One end of the T-shaped rod is fixed to the outer side of the sealing sleeve.

[0008] Preferably, the driving assembly includes a driving ring and a connecting ring sleeved on the outside of the sealing sleeve. The inner side of the driving ring is threadedly engaged with the outer side of the sealing sleeve. A rotating connecting assembly for auxiliary rotational connection is provided between the driving ring and the connecting ring. A connecting plate is provided between the connecting ring and the strip plate. The two ends of the connecting plate are rotatably connected to the connecting ring and the strip plate respectively by pins.

[0009] Preferably, the rotating connection assembly includes an annular groove formed on the connecting ring, a rotating ring rotatably connected inside the annular groove, the rotating ring being fixed to the drive ring, and the connecting ring, the annular groove, the rotating ring and the drive ring being concentrically arranged.

[0010] Preferably, two sets of the first sealing components are symmetrically arranged on the rotating ball. The first sealing component includes an annular connecting groove opened on the outside of the rotating ball, and an annular rubber airbag for sealing against the inner wall of the spherical groove is fixed on the annular connecting groove.

[0011] Preferably, the inflation assembly includes multiple sets of piston chambers formed on a rotating ball. Each set of piston chambers is arranged in a circular array on the rotating ball and communicates with the piston chambers. Multiple sets of push rods are slidably connected to the rotating ball. Each set of push rods is matched with each set of piston chambers. One end of each push rod is fixed to a connecting ring, and the other end of each push rod is located inside the piston chamber and fixed with a piston plate. The piston plate is matched with the interior of the piston chamber.

[0012] Preferably, the mounting assembly includes a mounting ring that is sleeved and fixed to the outside of the sealing cover. Multiple sets of threaded holes are provided between the mounting ring and the cabinet. The mounting ring and the threaded holes communicating with each other on the cabinet are connected and fixed by bolts. A sealing strip for sealing the cabinet is provided on one side of the mounting ring.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes the cooperation of an installation component, a first sealing component, a second sealing component, and a pulling component to form a multi-layered, contractile compression seal after the high-voltage cable is threaded through. This reduces the risk of incomplete sealing caused by dimensional deviations in the sealing ring and the high-voltage cable. Furthermore, during the sealing process, the rotating connection component ensures that the sealing ring inside the sealing sleeve can evenly abut against the outer side of the high-voltage cable, guaranteeing a good sealing effect. Additionally, this even abutment reduces the likelihood of localized wear and aging of the sealing ring due to uneven stress during the sealing process, thus improving sealing reliability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2 This is a schematic diagram showing the state of the sealing cover of the present invention after it has been installed on the cabinet. Figure 3 This is a schematic diagram of the mounting cover structure of the present invention; Figure 4 This is a schematic diagram of the spiral connection assembly and the first sealing assembly of the present invention; Figure 5 This is a schematic diagram of the inflatable component structure of the present invention; Figure 6 This is a schematic diagram showing the positional relationship between the high-voltage cable body, the two sets of second sealing components, and the pulling component of the present invention; Figure 7 This is a schematic diagram of the drive component structure of the present invention; Figure 8 This is a schematic diagram of the pull component structure of the present invention; Figure 9 This is a schematic diagram of the rotating connection assembly structure of the present invention; Figure 10 This is a schematic diagram of the second sealing assembly and the pulling assembly of the present invention; Figure 11 These are schematic diagrams illustrating different usage states of the spiral connection component of the present invention; Figure 12 This is a schematic diagram showing the state of a conventional seal when a high-voltage cable is installed at an angle.

[0015] In the diagram: 101-Cabinet; 102-Sealing cover; 103-High voltage cable body; 104-Sealing sleeve; 201-Mounting ring; 202-Threaded hole; 203-Bolt; 204-Sealing strip; 301-Spherical groove; 302-Rotating ball; 401-Annular mounting groove; 402-Sealing ring; 501-Pull rope; 502-Perforation; 503-Strip plate; 504-T-shaped rod; 601-Drive ring; 602-Connecting ring; 603-Connecting plate; 701-Annular groove; 702-Rotating ring; 801-Annular connecting groove; 802-Annular rubber airbag; 901-Piston chamber; 902-Push rod; 903-Piston plate. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1

[0018] Please see Figures 1-12 The high-voltage cable inlet seal of a switch cabinet shown in the figure includes a cabinet body 101 and a sealing cover 102 for sealing the inlet of the cabinet body 101. Multiple sets of high-voltage cable bodies 103 are connected through the cabinet body 101. The sealing cover 102 is sleeved on the outside of the high-voltage cable body 103. The inside of the sealing cover 102 is provided with a sealing sleeve 104 for sealing the high-voltage cable body 103. It should be noted here that the installation and connection of the high-voltage cable body 103 is a conventional technical means in this application, and its operation steps and principles will not be described in detail here. Also includes: The mounting component is located between the sealing cover 102 and the cabinet 101 to assist in the installation and connection of the sealing cover 102 on the cabinet 101. A rotary connection assembly is disposed between the sealing cover 102 and the sealing sleeve 104 to assist the sealing sleeve 104 in using different angles on the sealing cover 102. The rotary connection assembly is provided with a first sealing assembly for sealing after rotational adjustment. In addition, a second sealing component is provided inside the sealing sleeve 104 for sealing after the high-voltage cable body 103 passes through and is connected. The sealing sleeve 104 is provided with a pulling component for assisting in forcefully squeezing the second sealing component and a driving component for driving the pulling component. An inflation component for inflating and sealing the first sealing component is provided between the driving component and the first sealing component. It should be noted that the cooperation of the installation components, the first sealing component, the second sealing component, and the pulling component forms a multi-layered and compressive seal after the high-voltage cable body 103 is threaded through, reducing the sealing defects caused by dimensional deviations of the sealing ring 402 and the high-voltage cable body 103. In addition, during the sealing process, the rotating connecting component ensures that the sealing ring 402 inside the sealing sleeve 104 can evenly abut against the outer side of the high-voltage cable body 103, ensuring the subsequent sealing effect. Furthermore, the even abutment reduces the probability of local wear and aging of the sealing ring 402 due to uneven force during the sealing process, thus improving the reliability of the seal.

[0019] Preferably, the rotary connection assembly includes a spherical groove 301 formed on the sealing cover 102, a rotating ball 302 is rotatably connected inside the spherical groove 301, and the sealing sleeve 104 is centrally fixed on the rotating ball 302; It should be noted that after the high-voltage cable body 103 is connected to the inlet, the spherical groove 301 and the rotating ball 302 provide a rotatable connection to the sealing sleeve 104, allowing the high-voltage cable body 103 with the inlet wire passing through the sealing sleeve 104 to rotate and swing adaptively according to its own operating angle. During the swinging process, the sealing sleeve 104 and the high-voltage cable body 103 with the inlet wire passing through the inner side of the sealing sleeve 104 always remain axially parallel.

[0020] Preferably, two sets of the second sealing assembly are symmetrically arranged inside the sealing sleeve 104. The second sealing assembly includes an annular mounting groove 401 opened inside the sealing sleeve 104. A sealing ring 402 for sealing against the outside of the high-voltage cable body 103 is installed inside the annular mounting groove 401. It should be noted that after the sealing cover 102 is installed, the high-voltage cable is threaded through. During the connection process, one end of the high-voltage cable body 103 is passed through the sealing sleeve 104 of the sealing cover 102 and electrically connected to the corresponding position inside the cabinet 101. During the threading process, the sealing ring 402 inside the annular mounting groove 401 initially abuts against the outer side of the high-voltage cable body 103, achieving a preliminary sealing effect. Then, through subsequent pulling, the sealing ring 402 is pulled and tightened. During the tightening process, the inner side of the sealing ring 402 fully abuts against the high-voltage cable body 103 after the threaded cable is inserted, forming a further abutment seal, ensuring the sealing effect of the high-voltage cable body 103.

[0021] Preferably, the pulling assembly includes two sets of pull ropes 501 wrapped around the outside of the sealing ring 402. The upper and lower sides of the sealing sleeve 104 are provided with two sets of through holes 502 for the ends of the pull ropes 501 to pass through. The two ends of the pull ropes 501 pass through the two sets of through holes 502 respectively. Two sets of strip plates 503 are provided on the outside of the sealing sleeve 104. The two ends of the pull ropes 501 are fixed to the two sets of strip plates 503 respectively. Multiple sets of T-shaped rods 504 are slidably connected on the strip plates 503. One end of the T-shaped rod 504 is fixed to the outside of the sealing sleeve 104. It should be noted that: through transmission, the connecting ring 602 is driven to move. During the movement of the connecting ring 602, the two sets of connecting plates 603 are connected and driven, causing the two sets of strip plates 503 to move under force. During the movement of the strip plates 503 under force, the sliding guide action of the T-shaped rod 504 causes the two sets of strip plates 503 to move away from the sealing sleeve 104. The movement of the two sets of strip plates 503 pulls the two ends of the pull rope 501. Since the pull rope 501 is wrapped around the outside of the sealing ring 402, during the pulling of the pull rope 501, the sealing ring 402 is pulled and tightened by the mutual pressing action between the pull rope 501 and the outside of the sealing ring 402. During the tightening process, the inner side of the sealing ring 402 fully abuts against the high-voltage cable body 103 after the incoming line is inserted, forming a further abutment seal and ensuring the sealing effect of the high-voltage cable body 103.

[0022] Preferably, the drive assembly includes a drive ring 601 and a connecting ring 602 sleeved on the outside of the sealing sleeve 104. The inner side of the drive ring 601 is threadedly engaged with the outer side of the sealing sleeve 104. A rotating connection assembly for auxiliary rotational connection is provided between the drive ring 601 and the connecting ring 602. A connecting plate 603 is provided between the connecting ring 602 and the strip plate 503. The two ends of the connecting plate 603 are rotatably connected to the connecting ring 602 and the strip plate 503 respectively by pins. It should be noted that when the drive ring 601 is rotated, the drive ring 601 moves axially toward the sealing cover 102 on the outside of the sealing sleeve 104 through the mutual meshing transmission between the inner side of the drive ring 601 and the outer side of the sealing sleeve 104. During the movement, the connecting ring 602 is driven to move through the connection between the annular groove 701 and the rotating ring 702.

[0023] Preferably, the rotating connection assembly includes an annular groove 701 formed on the connecting ring 602, and a rotating ring 702 is rotatably connected inside the annular groove 701. The rotating ring 702 is fixed to the driving ring 601, and the connecting ring 602, the annular groove 701, the rotating ring 702 and the driving ring 601 are concentrically arranged. It should be noted here that the annular groove 701 and the rotating ring 702 facilitate the rotatable connection between the auxiliary drive ring 601 and the connecting ring 602.

[0024] Preferably, two sets of first sealing components are symmetrically arranged on the rotating ball 302. The first sealing component includes an annular connecting groove 801 opened on the outside of the rotating ball 302, and an annular rubber airbag 802 for sealing against the inner wall of the spherical groove 301 is fixed on the annular connecting groove 801. It should be noted here that: the annular connecting groove 801 is inflated by the inflation component. During the inflation process, the annular rubber airbag 802 expands under the pressure inside the annular connecting groove 801. During the expansion of the annular rubber airbag 802, the outer side of the annular rubber airbag 802 abuts against the inner side of the spherical groove 301. Through the abutting action, the rotating ball 302 and the spherical groove 301 are sealed against each other after rotation. In addition, through the abutting compression action, the rotating ball 302 can be limited to abutting position after the direction adjustment. Additionally, it should be noted that the annular connecting groove 801 is pre-filled with some gas. The presence of gas allows the annular rubber airbag 802 to expand more efficiently during subsequent inflation. The annular rubber airbag 802 is a conventional flexible sealing component. Its structure and expansion principle are known technologies in this application and will not be described in detail here.

[0025] Preferably, the inflation assembly includes multiple sets of piston chambers 901 formed on the rotating ball 302. Each set of piston chambers 901 is arranged in a ring array on the rotating ball 302 and communicates with the piston chambers 901. Multiple sets of push rods 902 are slidably connected on the rotating ball 302. Each set of push rods 902 is matched with each set of piston chambers 901. One end of the push rod 902 is fixed to the connecting ring 602, and the other end of the push rod 902 is located inside the piston chamber 901 and is fixed with a piston plate 903. The piston plate 903 is matched with the interior of the piston chamber 901. It should be noted here that: through transmission, the connecting ring 602 is driven to move. During the movement of the connecting ring 602, through the connection of each set of push rods 902, each set of piston plates 903 is pushed to move inside the piston chamber 901. Through the movement of the piston plates 903, part of the gas inside the piston chamber 901 is squeezed and transported to the inside of the annular connecting groove 801, thus filling the inside of the annular connecting groove 801 with gas.

[0026] Preferably, the mounting assembly includes a mounting ring 201 that is fitted and fixed to the outside of the sealing cover 102. Multiple sets of threaded holes 202 are provided between the mounting ring 201 and the cabinet 101. The threaded holes 202 communicating with each other on the mounting ring 201 and the cabinet 101 are connected and fixed by bolts 203. A sealing strip 204 for sealing the cabinet 101 is provided on one side of the mounting ring 201. It should be noted that: the sealing cover 102 is pre-installed on the cabinet 101. During the installation process, the sealing cover 102 is pushed toward the cabinet 101. During the pushing process, the sealing strip 204 on the mounting ring 201 abuts against the cabinet 101. The sealing strip 204 seals the installed sealing cover 102 and the cabinet 101. In addition, during the pushing process of the sealing cover 102, the threaded holes 202 on the mounting ring 201 are connected to the threaded holes 202 on the cabinet 101 and threadedly connected by bolts 203, thus completing the installation of the sealing cover 102 on the cabinet 101.

[0027] In this solution: a high-voltage cable inlet seal for a switchgear includes the following steps: When performing high-voltage cable entry work on the switchgear, the sealing cover 102 is pre-installed on the cabinet 101. During the installation process, the sealing cover 102 is pushed toward the cabinet 101. During the pushing process, the sealing strip 204 on the mounting ring 201 abuts against the cabinet 101. The sealing strip 204 seals the installed sealing cover 102 and the cabinet 101. In addition, during the pushing process of the sealing cover 102, the threaded holes 202 on the mounting ring 201 are connected to the threaded holes 202 on the cabinet 101 and threadedly connected by bolts 203, thus completing the installation of the sealing cover 102 on the cabinet 101. After the sealing cover 102 is installed, the high-voltage cable is threaded through. During the connection process, one end of the high-voltage cable 103 passes through the sealing sleeve 104 of the sealing cover 102 and is electrically connected to the corresponding position inside the cabinet 101. During the threading process, the sealing ring 402 inside the annular mounting groove 401 initially abuts against the outside of the high-voltage cable 103, achieving a preliminary sealing effect. After the high-voltage cable 103 is connected, the spherical groove 301 and the rotating ball 302 provide a rotatable connection to the sealing sleeve 104, allowing the high-voltage cable 103 threaded through the sealing sleeve 104 to rotate and swing adaptively according to its own operating angle. During the swinging process, the sealing sleeve 104 and the high-voltage cable 103 threaded inside the sealing sleeve 104 always remain axially parallel (see...). Figure 11By setting the axial parallel, the sealing ring 402 inside the sealing sleeve 104 can be evenly abutted against the outer side of the high-voltage cable body 103, ensuring the subsequent sealing effect. In addition, by abutting evenly, the probability of the sealing ring 402 being locally worn and aged due to uneven force during the sealing process is reduced, thereby improving the sealing reliability. In addition, after adjusting the wiring and usage direction of the high-voltage cable body 103, the high-voltage cable body 103 is further sealed. During the sealing process, the drive ring 601 is rotated. During the rotation of the drive ring 601, the mutual meshing transmission between the inner side of the drive ring 601 and the outer side of the sealing sleeve 104 causes the drive ring 601 to move axially toward the sealing cover 102 on the outer side of the sealing sleeve 104. During the movement, the connection between the annular groove 701 and the rotating ring 702 drives the connecting ring 602 to move. During the movement of the connecting ring 602, the connection between each set of push rods 902 pushes each set of piston plates 903 to move in their respective positions. The internal movement of the piston chamber 901, through the movement of the piston plate 903, compresses and transports part of the gas inside the piston chamber 901 to the interior of the annular connecting groove 801, inflating the interior of the annular connecting groove 801. During the inflation process, the annular rubber bladder 802 expands under the pressure inside the annular connecting groove 801. During the expansion of the annular rubber bladder 802, the outer side of the annular rubber bladder 802 abuts against the inner side of the spherical groove 301. Through the abutting action, the rotating ball 302 and the spherical groove 301 are sealed against each other. In addition, through the abutting and compressing action, the rotating ball 302 can be limited to abutting position after the steering adjustment. During the movement of the connecting ring 602, the two sets of connecting plates 603 are connected and driven, causing the two sets of strip plates 503 to move under force. During the movement of the strip plates 503 under force, the sliding guide action of the T-shaped rod 504 causes the two sets of strip plates 503 to move away from the sealing sleeve 104. The movement of the two sets of strip plates 503 pulls the two ends of the pull rope 501. Since the pull rope 501 is wrapped around the outside of the sealing ring 402, during the pulling of the pull rope 501, the sealing ring 402 is pulled and tightened by the mutual pressing action between the pull rope 501 and the outside of the sealing ring 402. During the tightening process, the inner side of the sealing ring 402 fully abuts against the high-voltage cable body 103 after the cable is inserted, forming a further abutment seal. This reduces the sealing defects caused by the size deviation of the sealing ring 402 and the high-voltage cable body 103, ensuring the sealing effect of the high-voltage cable body 103.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage cable inlet seal for a switchgear, comprising: The cabinet (101) and the sealing cover (102) for sealing the incoming line of the cabinet (101) are provided. Multiple sets of high-voltage cable bodies (103) are connected through the cabinet (101). The sealing cover (102) is sleeved on the outside of the high-voltage cable body (103). The inside of the sealing cover (102) is provided with a sealing sleeve (104) for sealing the high-voltage cable body (103). Its characteristic is that it further includes: The mounting component is located between the sealing cover (102) and the cabinet (101) to assist in the installation connection of the sealing cover (102) on the cabinet (101); A rotary connection assembly is disposed between the sealing cover (102) and the sealing sleeve (104) to assist the sealing sleeve (104) in being used at different angles on the sealing cover (102). The rotary connection assembly is provided with a first sealing assembly for sealing after rotation adjustment. In addition, a second sealing component is provided inside the sealing sleeve (104) for sealing after the high-voltage cable body (103) passes through and is connected. The sealing sleeve (104) is provided with a pulling component for assisting in forcefully squeezing the second sealing component and a driving component for driving the pulling component. An inflation component for inflating and sealing the first sealing component is provided between the driving component and the first sealing component.

2. The high-voltage cable inlet seal of a switchgear according to claim 1, characterized in that: The rotary connection assembly includes a spherical groove (301) formed on the sealing cover (102), and a rotating ball (302) is rotatably connected inside the spherical groove (301). The sealing sleeve (104) is centrally fixed on the rotating ball (302).

3. The high-voltage cable inlet seal of a switchgear according to claim 2, characterized in that: The second sealing assembly is symmetrically provided in two sets on the inner side of the sealing sleeve (104). The second sealing assembly includes an annular mounting groove (401) opened inside the sealing sleeve (104). A sealing ring (402) for sealing against the outside of the high-voltage cable body (103) is installed inside the annular mounting groove (401).

4. The high-voltage cable inlet seal of a switchgear according to claim 3, characterized in that: The pulling assembly includes two sets of pull ropes (501) wrapped around the outside of the sealing ring (402). The upper and lower sides of the sealing sleeve (104) are provided with two sets of through holes (502) for the ends of the pull ropes (501) to pass through. The two ends of the pull ropes (501) pass through the two sets of through holes (502) respectively. The outer side of the sealing sleeve (104) is provided with two sets of strip plates (503). The two ends of the pull ropes (501) are fixed to the two sets of strip plates (503) respectively. Multiple sets of T-shaped rods (504) are slidably connected on the strip plates (503). One end of the T-shaped rods (504) is fixed to the outer side of the sealing sleeve (104).

5. The high-voltage cable inlet seal of a switchgear according to claim 4, characterized in that: The drive assembly includes a drive ring (601) and a connecting ring (602) sleeved on the outside of the sealing sleeve (104). The inner side of the drive ring (601) is threadedly engaged with the outer side of the sealing sleeve (104). A rotating connection assembly for auxiliary rotational connection is provided between the drive ring (601) and the connecting ring (602). A connecting plate (603) is provided between the connecting ring (602) and the strip plate (503). The two ends of the connecting plate (603) are rotatably connected to the connecting ring (602) and the strip plate (503) respectively by pins.

6. The high-voltage cable inlet seal of a switchgear according to claim 5, characterized in that: The rotating connection assembly includes an annular groove (701) formed on the connecting ring (602), and a rotating ring (702) is rotatably connected inside the annular groove (701). The rotating ring (702) is fixed to the driving ring (601), and the connecting ring (602), the annular groove (701), the rotating ring (702) and the driving ring (601) are concentrically arranged.

7. The high-voltage cable inlet seal of a switchgear according to claim 5, characterized in that: The first sealing assembly is symmetrically arranged in two sets on the rotating ball (302). The first sealing assembly includes an annular connecting groove (801) opened on the outside of the rotating ball (302). An annular rubber airbag (802) for sealing against the inner wall of the spherical groove (301) is fixed on the annular connecting groove (801).

8. The high-voltage cable inlet seal of a switchgear according to claim 7, characterized in that: The inflation assembly includes multiple sets of piston chambers (901) opened on the rotating ball (302). Each set of piston chambers (901) is arranged in a ring array on the rotating ball (302) and communicates with the piston chambers (901). Multiple sets of push rods (902) are slidably connected on the rotating ball (302). Each set of push rods (902) is matched with each set of piston chambers (901). One end of the push rod (902) is fixed to the connecting ring (602), and the other end of the push rod (902) is located inside the piston chamber (901) and fixed with a piston plate (903). The piston plate (903) is matched with the inside of the piston chamber (901).

9. A high-voltage cable inlet seal for a switchgear according to claim 1, characterized in that: The mounting assembly includes a mounting ring (201) that is fitted and fixed to the outside of the sealing cover (102). Multiple sets of threaded holes (202) are provided between the mounting ring (201) and the cabinet (101). The threaded holes (202) communicating with each other on the mounting ring (201) and the cabinet (101) are connected and fixed by bolts (203). A sealing strip (204) for sealing the cabinet (101) is provided on one side of the mounting ring (201).

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