Power distribution cabinet incoming and outgoing line sealing device and power distribution cabinet

Abstract

The utility model discloses a power distribution cabinet incoming and outgoing line sealing device and a power distribution cabinet, and relates to the technical field of power distribution cabinets. Comprising a wire inlet and outlet pipe, and one end of the wire inlet and outlet pipe is connected with a wire inlet and outlet hole of a cabinet body; a positioning sealing assembly is arranged in the wire inlet and outlet pipe and comprises an elastically-deformable expansion sealing cylinder and two positioning rings connected to the two ends of the expansion sealing cylinder respectively, the positioning rings are connected with the inner surface of the wire inlet and outlet pipe in a sealed mode, and a sealed inflation cavity is defined by the wire inlet and outlet pipe, the expansion sealing cylinder and the two positioning rings. An inflation valve communicated with the inflation cavity is arranged on the outer surface of the wire inlet and outlet pipe. The incoming and outgoing line sealing device of the power distribution cabinet is used for being installed at the incoming and outgoing line hole of the power distribution cabinet to seal a cable, sealing continuity and reliability are guaranteed, and the problem that sealing fails due to the fact that a dynamic gap is easily generated between an air bag and the outer wall of the cable in existing air bag sealing is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power distribution cabinets, in particular to a power distribution cabinet incoming and outgoing line sealing device and a power distribution cabinet. BACKGROUND

[0002] A power distribution cabinet is an important component of a power distribution system and is mainly used to realize the functions of power distribution, control and protection. The cabinet body of the power distribution cabinet is usually provided with an incoming and outgoing line hole for the cable to enter or exit. Since the inner diameter of the incoming and outgoing line hole is generally larger than the outer diameter of the cable, in order to prevent external factors such as water vapor, dust and small animals from entering the inside of the cabinet, the incoming and outgoing line hole needs to be effectively sealed to ensure the safe and stable operation of the power distribution cabinet.

[0003] The traditional sealing method is to fill and block the incoming and outgoing line hole with fireproof mortar. Fireproof mortar is a plastic material with organic silicone resin as the base material, which can be quickly cured at room temperature and has certain flexibility and sealing performance, and can realize the functions of fireproofing, dustproofing and small animal prevention to a certain extent. However, when the material is affected by temperature difference changes or humidity fluctuations for a long time, it is easy to cause high molecular chain rupture, leading to hardening, brittle fracture and adhesion failure, and thus causing sealing failure. In addition, during the cable replacement or maintenance process, the fireproof mortar needs to be peeled off by mechanical means, which is complicated to operate, difficult to remove the residue, and easy to cause damage to the cable insulation layer, increasing the maintenance cost and safety hazard.

[0004] In order to overcome the defects of the traditional sealing method, a cable incoming and outgoing line sealing structure using an air bag has appeared, as described in patents CN219554195U and CN222508382U. This type of sealing structure is provided with an incoming and outgoing line pipe at the incoming and outgoing line hole, and an annular air bag is arranged in the pipe. After the cable enters, the air bag is inflated radially to tightly adhere to the outer wall of the cable to achieve sealing. This sealing structure has the advantages of convenient installation and removal, and can be reused. However, in actual engineering application, it is found that in order to meet the installation and inflation of the air bag, there is usually a large radial gap between the incoming and outgoing line pipe and the cable. When the cable is subjected to wind force or other external force, the cable is easy to swing radially in the pipe, and thus a dynamic gap is generated between the air bag and the outer wall of the cable, forming a potential leakage channel, which eventually causes sealing failure, affecting the continuity and reliability of the sealing. UTILITY MODEL CONTENTS

[0005] The application aims to provide a power distribution cabinet incoming and outgoing line sealing device and a power distribution cabinet, which solves the problem that the cable is easy to swing radially in the pipe when subjected to external force, causing a dynamic gap between the air bag and the outer wall of the cable and forming a potential leakage channel, thus causing sealing failure.

[0006] The technical solution adopted by the application to solve the technical problems is:

[0007] In a first aspect, a sealing device for incoming and outgoing lines of a power distribution cabinet is provided, comprising an incoming and outgoing line pipe, one end of the pipe being used to connect with an incoming and outgoing line hole of a cabinet body; a positioning and sealing assembly is arranged in the pipe, the positioning and sealing assembly comprising an elastically deformable expansion sealing cylinder and two positioning rings connected to two ends of the expansion sealing cylinder respectively, the positioning rings being sealingly connected with the inner surface of the pipe and forming a sealed inflation cavity between the pipe, the expansion sealing cylinder and the two positioning rings, and the outer surface of the pipe being provided with an inflation valve in communication with the inflation cavity.

[0008] Further, a plurality of fixing rods are arranged in the inflation cavity, the fixing rods being distributed along the circumference of the positioning rings, and two ends of each fixing rod being connected with two positioning rings respectively.

[0009] Further, the expansion sealing cylinder comprises at least two spacer rings arranged coaxially and spaced apart, a cylindrical expansion wall connected between any two adjacent spacer rings and being elastically deformable, and two outermost spacer rings being sealingly connected with two positioning rings respectively, and the spacer rings being connected with the fixing rods.

[0010] Further, an annular piston cavity coaxially arranged with the positioning ring is arranged on the end face of the positioning ring in the inflation cavity, and a piston ring sliding along the axial direction of the annular piston cavity is sealingly fitted in the annular piston cavity; a pressing ring, an elastically deformable expansion sealing ring and a limiting ring are coaxially arranged in the direction away from the inflation cavity on one side of the positioning ring outside the inflation cavity, the limiting ring being connected with the inner surface of the pipe, a push rod penetrating the positioning ring along the axial direction of the pressing ring and being connected with the piston ring being fixed on the pressing ring, and the push rod being movable along the axial direction.

[0011] Further, a radial clamping device is arranged at the end of the pipe away from the incoming and outgoing line hole, the radial clamping device being used to clamp the cable radially.

[0012] Further, the radial clamping device comprises a plurality of arc-shaped plates arranged in the pipe along the circumferential direction, a guide rod penetrating the pipe wall along the radial direction of the pipe being connected on each arc-shaped plate, the guide rod being movable along the axial direction, the outer end of the guide rod being connected with a limiting block, a spring being arranged on the guide rod between the limiting block and the pipe, and a pressing pipe being threadedly connected with the inner hole of the pipe, the end of the pressing pipe extending to the space between the inner surface of the pipe and the outer surface of the arc-shaped plate, and a guide cone surface being formed between the inner surface of the end of the pressing pipe and the outer surface of the end of the arc-shaped plate.

[0013] Further, the inner surface of the pressing pipe is provided with an embedding groove arranged along the circumferential direction, and a water stop strip is arranged in the embedding groove.

[0014] Further, an installation ring is connected to the inner surface of one end of the access line pipe towards the access line hole, and a flange sealing lip is connected to the inner hole of the installation ring.

[0015] Further, the access line pipe and the access line hole are connected in a detachable structure.

[0016] In a second aspect, a power distribution cabinet is provided, including a cabinet body and a cabinet door, and a side wall of the cabinet body is provided with an access line hole, and an access line sealing device is connected at the access line hole, and the access line sealing device is the power distribution cabinet access line sealing device provided in the first aspect.

[0017] The beneficial effects of the present application are as follows:

[0018] The power distribution cabinet access line sealing device provided in the embodiments of the present application is used for being installed at the access line hole of a power distribution cabinet to seal a cable; after the cable passes through the access line pipe, the inflation valve is used to inflate the inflation cavity, so that the inflatable sealing cylinder is inflated and tightly adheres to the outer wall of the cable, thereby sealing the cable in the access line pipe. The two positioning rings are respectively arranged at the two ends of the inflatable sealing cylinder, and the two positioning rings are used to limit the axial direction of the inflatable sealing cylinder, so that the inflatable sealing cylinder is only radially inflated after inflation, and the sealing specific pressure of the inflatable sealing cylinder is improved. At the same time, the two positioning rings are used to support and position the cable in the radial direction, and the large gap originally reserved for the inflation of the air bag is reduced to a small gap, and the radial swing of the cable in the sealing section between the two positioning rings is significantly inhibited. When the cable is affected by wind force or other external force, the two positioning rings limit the large swing displacement of the cable outside the sealing area, and the inflatable sealing cylinder continuously maintains the radial pre-pressing under the action of air pressure and always tightly adheres to the cable, thereby avoiding the generation of a dynamic gap between the inflatable sealing cylinder and the cable, so as to ensure the continuity and reliability of the sealing. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 is a structural schematic diagram of a power distribution cabinet provided in the embodiments of the present application;

[0021] Figure 2 is Figure 1 is a structural schematic diagram of the power distribution cabinet after removing the access line sealing device;

[0022] Figure 3 is a partial sectional view of the cabinet body;

[0023] Figure 4 is Figure 3 A enlarged view of A in FIG. 1;

[0024] Figure 5 is a perspective view of the inlet and outlet line sealing device provided by the embodiments of the present application;

[0025] Figure 6 is a side view of the inlet and outlet line sealing device provided by the embodiments of the present application;

[0026] Figure 7 is Figure 6 is a sectional view along A-A line in FIG. 2;

[0027] Figure 8 is a structural schematic view of the positioning sealing assembly;

[0028] Figure 9 is a structural schematic view of the connection between the inflation sealing cylinder and the positioning ring;

[0029] Figure 10 is a structural schematic view of the radial clamping device;

[0030] Figure 11 is a schematic view of the detachable structure.

[0031] Reference signs:

[0032] 1 - cabinet body; 11 - inlet and outlet line hole;

[0033] 2 - cabinet door;

[0034] 3 - inlet and outlet line sealing device;

[0035] 31 - inlet and outlet line pipe; 311 - inflation valve; 312 - exhaust valve; 313 - sealing plug;

[0036] 32 - positioning sealing assembly; 321 - inflation sealing cylinder; 3211 - spacer ring; 3212 - cylindrical inflation wall; 322 - positioning ring; 3221 - annular piston cavity; 323 - inflation cavity; 324 - fixed rod; 325 - piston ring; 326 - compression ring; 327 - inflation sealing ring; 328 - limiting ring; 329 - push rod;

[0037] 33 - radial clamping device; 331 - arc plate; 332 - guide rod; 333 - limiting block; 334 - spring; 335 - compression pipe; 3351 - embedding groove; 336 - guide cone surface; 337 - water stop strip;

[0038] 34 - mounting ring;

[0039] 35 - flange sealing lip;

[0040] 36 - detachable structure; 361 - locking nut; 362 - fixing ring; 363 - first sealing gasket; 364 - second sealing gasket; 365 - third sealing gasket. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0042] In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified, the above orientation description can be flexibly arranged in the process of actual application, as long as the relative positional relationship shown in the drawings is met.

[0043] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 The embodiments of the present application provide a power distribution cabinet, which comprises a cabinet body 1 and a cabinet door 2, and the side wall of the cabinet body 1 is provided with an inlet and outlet line hole 11, which can include one, two or more than two, and an inlet and outlet line sealing device 3 is connected at each inlet and outlet line hole 11, and the inlet and outlet line sealing device 3 is the inlet and outlet line sealing device of the power distribution cabinet provided by the embodiments of the present application.

[0045] Referring to Figure 5 , Figure 6 , Figure 7The embodiment of the application provides a power distribution cabinet incoming-outgoing line sealing device, which comprises an incoming-outgoing line pipe 31, one end of the incoming-outgoing line pipe 31 being used for being connected with an incoming-outgoing line hole 11 of a cabinet body 1; a positioning and sealing assembly 32 is arranged in the incoming-outgoing line pipe 31, the positioning and sealing assembly 32 comprises an elastically deformable expansion sealing cylinder 321 and two positioning rings 322 connected with two ends of the expansion sealing cylinder 321 respectively, the positioning ring 322 is sealingly connected with the inner surface of the incoming-outgoing line pipe 31, and a sealed inflation cavity 323 is surrounded between the incoming-outgoing line pipe 31, the expansion sealing cylinder 321 and the two positioning rings 322, and the outer surface of the incoming-outgoing line pipe 31 is provided with an inflation valve 311 in communication with the inflation cavity 323.

[0046] The incoming-outgoing line pipe 31 is a circular pipe with two open ends and can be made of metal material. The incoming-outgoing line pipe 31 is arranged outside the cabinet body 1, one end of the incoming-outgoing line pipe 31 is sealingly connected with the outer wall of the cabinet body 1, and the other end is open; thus, leakage between the incoming-outgoing line pipe 31 and the cabinet body 1 is prevented, and the inner cavity of the incoming-outgoing line pipe 31 is in communication with the incoming-outgoing line hole 11 of the cabinet body 1. The positioning and sealing assembly 32 is used for radially positioning and sealing the cable passing through the incoming-outgoing line pipe 31, and mainly comprises the expansion sealing cylinder 321 arranged coaxially in the incoming-outgoing line pipe 31 and the two positioning rings 322.

[0047] The expansion sealing cylinder 321 can be a cylindrical structure with two open ends made of high resilience material, which can be elastically deformed under external force. In the initial state without external force, the inner diameter of the expansion sealing cylinder 321 is slightly larger than the outer diameter of the cable, so that the cable can pass through the expansion sealing cylinder 321, and the outer diameter of the expansion sealing cylinder 321 is smaller than the inner diameter of the incoming-outgoing line pipe 31, so as to form an installation space between the outer surface of the expansion sealing cylinder 321 and the inner surface of the incoming-outgoing line pipe 31.

[0048] The two positioning rings 322 are coaxially and sealingly connected with the two ends of the expansion sealing cylinder 321, so as to prevent leakage between the positioning ring 322 and the expansion sealing cylinder 321. The outer surface of the positioning ring 322 is sealingly connected with the inner surface of the incoming-outgoing line pipe 31, so as to prevent leakage between the two. The inner diameter of the positioning ring 322 is slightly larger than the outer diameter of the cable, so that the cable can pass through the positioning ring 322, and the positioning ring 322 is used for radially supporting and positioning the cable. In the case that the cable can pass through the positioning ring 322, the gap between the cable and the positioning ring 322 should be as small as possible. For example, the inner diameter of the positioning ring 322 is equal to the outer diameter of the cable + installation gap, the installation gap is 0.2-0.5mm, and preferably 0.3mm. In the embodiment, in the initial state without external force, the inner diameter of the expansion sealing cylinder 321 is consistent with the inner diameter of the positioning ring 322.

[0049] When the positioning and sealing assembly 32 is installed into the access line pipe 31, a sealed air charging cavity 323 is formed between the inner surface of the access line pipe 31, the outer surface of the expansion sealing cylinder 321 and the end surfaces of the two positioning rings 322. The outer wall of the access line pipe 31 is sealingly connected with an air charging valve 311 which is in communication with the air charging cavity 323. The air charging valve 311 can be used to charge air into the air charging cavity 323 to increase the air pressure in the air charging cavity 323, and then the expansion sealing cylinder 321 is elastically deformed under the action of the air pressure to expand inwardly and tightly adhere to the outer wall of the cable, thereby achieving the sealing of the cable.

[0050] The power distribution cabinet access line sealing device provided by the embodiments of the present application is used for installing at the access line hole 11 of the power distribution cabinet to seal the cable. The specific sealing process is as follows: the cable is passed through the inner holes of the expansion sealing cylinder 321 and the two positioning rings 322, the air charging valve 311 is opened, the air charging equipment is connected with the inlet of the air charging valve 311, and the air charging equipment is started to charge air into the air charging cavity 323. In this process, the pressure in the air charging cavity 323 is increased, the expansion sealing cylinder 321 is elastically deformed along the radial direction to expand inwardly and tightly adhere to the outer wall of the cable, so that the expansion sealing cylinder 321 performs full circumferential covering and sealing on the outer surface of the cable. After the sealing is completed, the air charging valve 311 is closed, and the air charging equipment is separated from the air charging valve 311. When the cable needs to be replaced or repaired, the air charging valve 311 is opened, the air in the air charging cavity 323 is discharged, the expansion sealing cylinder 321 returns to the initial state and moves away from the outer surface of the cable, and then the cable can be taken out of the access line pipe 31 for replacement or repair.

[0051] The power distribution cabinet access line sealing device provided by the embodiments of the present application is used for installing at the access line hole 11 of the power distribution cabinet to seal the cable. The specific sealing process is as follows: the cable is passed through the inner holes of the expansion sealing cylinder 321 and the two positioning rings 322, the air charging valve 311 is opened, the air charging equipment is connected with the inlet of the air charging valve 311, and the air charging equipment is started to charge air into the air charging cavity 323. In this process, the pressure in the air charging cavity 323 is increased, the expansion sealing cylinder 321 is elastically deformed along the radial direction to expand inwardly and tightly adhere to the outer wall of the cable, so that the expansion sealing cylinder 321 performs full circumferential covering and sealing on the outer surface of the cable. After the sealing is completed, the air charging valve 311 is closed, and the air charging equipment is separated from the air charging valve 311. When the cable needs to be replaced or repaired, the air charging valve 311 is opened, the air in the air charging cavity 323 is discharged, the expansion sealing cylinder 321 returns to the initial state and moves away from the outer surface of the cable, and then the cable can be taken out of the access line pipe 31 for replacement or repair.

[0052] In some embodiments, referring to Figure 7 , Figure 8The inflation cavity 323 is provided with a plurality of fixing rods 324, which are evenly distributed along the circumference of the positioning ring 322, and two ends of each fixing rod 324 are connected with two positioning rings 322 respectively.

[0053] Correspondingly, by connecting two ends of the fixing rod 324 with two positioning rings 322 respectively, the two positioning rings 322 are connected into a rigid whole before the positioning and sealing assembly 32 is installed into the access line pipe 31. During the process of installing the positioning and sealing assembly 32 into the access line pipe 31 and fixing, the spacing and concentricity between the two positioning rings 322 can be avoided from changing, and the expansion sealing cylinder 321 can also be prevented from being squeezed accidentally, thereby improving the installation quality of the positioning and sealing assembly 32 and reducing the installation difficulty.

[0054] In some embodiments, referring to Figure 9 The expansion sealing cylinder 321 comprises at least two spacer rings 3211 arranged coaxially and spaced apart, a cylindrical expansion wall 3212 connected between any two adjacent spacer rings 3211 and elastically deformable, and the outermost two spacer rings 3211 are respectively and sealingly connected with the two positioning rings 322, and the spacer ring 3211 is connected with the fixing rod 324.

[0055] Specifically, the spacer ring 3211 is arranged coaxially with the positioning ring 322, the inner diameter of the spacer ring 3211 is equal to the inner diameter of the positioning ring 322, and the outer diameter of the spacer ring 3211 is smaller than the outer diameter of the positioning ring 322. The spacer ring 3211 and the positioning ring 322 can be fixedly connected in a sealing welding manner. The cylindrical expansion wall 3212 can be a cylindrical structure with two open ends made of a high-resilience material, which can elastically deform under external force. In the initial state without external force, the inner diameter of the cylindrical expansion wall 3212 is equal to the inner diameter of the spacer ring 3211, and the outer diameter of the cylindrical expansion wall 3212 is smaller than the outer diameter of the spacer ring 3211.

[0056] When the inflation cavity 323 is inflated, the pressure in the inflation cavity 323 rises, the cylindrical expansion wall 3212 elastically deforms along its radial direction and expands inward to tightly adhere to the outer wall of the cable, so that the expansion sealing cylinder 321 performs full circumferential covering and sealing on the outer surface of the cable. When the cable needs to be replaced or repaired, the gas in the inflation cavity 323 is discharged, the cylindrical expansion wall 3212 returns to the initial state and moves away from the outer surface of the cable, and then the cable can be taken out of the access line pipe 31 for replacement or repair.

[0057] Correspondingly, the spacer ring 3211 and the positioning ring 322 are connected together by the fixing rod 324 to form a rigid frame; during the process of installing the positioning and sealing assembly 32 into the access line pipe 31 and fixing, the relative position between the positioning ring 322 and the spacer ring 3211 can be avoided from changing, and at the same time, the cylindrical expansion wall 3212 can also be prevented from being accidentally extruded, thereby improving the installation quality of the positioning and sealing assembly 32 and reducing the installation difficulty. By arranging a plurality of cylindrical expansion walls 3212, multiple sealing can be formed between the two positioning rings 322, and at the same time, the cable is radially supported and positioned in the sealing section between the two positioning rings 322 by the spacer ring 3211, further reducing the swing displacement of the cable in the sealing section between the two positioning rings 322, and further improving the reliability of the sealing.

[0058] In some embodiments, referring to Figure 8 , the end face of the positioning ring 322 located in the inflation cavity 323 is provided with an annular piston cavity 3221 coaxially arranged therewith, and a piston ring 325 sliding in the axial direction is sealingly fitted in the annular piston cavity 3221; one side of the positioning ring 322 located outside the inflation cavity 323 is coaxially provided with a compression ring 326, an elastically deformable expansion sealing ring 327 and a limiting ring 328 in sequence away from the inflation cavity 323, the limiting ring 328 is connected with the inner surface of the access line pipe 31, the compression ring 326 is fixed with a push rod 329 penetrating the positioning ring 322 in the axial direction and connected with the piston ring 325, and the push rod 329 is movable in the axial direction.

[0059] Specifically, the end face of the positioning ring 322 located in the inflation cavity 323 is provided with a ring-shaped groove coaxially arranged with the positioning ring 322, the inner diameter of the groove is larger than the inner diameter of the positioning ring 322, and the outer diameter of the groove can be smaller than the outer diameter of the positioning ring 322, at this time the groove forms an annular piston cavity 3221; the outer diameter of the groove can also be equal to the outer diameter of the positioning ring 322, at this time the groove and the inner surface of the access line pipe 31 opposite to the groove jointly form the annular piston cavity 3221. The piston ring 325 is sealingly fitted in the annular piston cavity 3221, so that the piston ring 325 moves axially in the annular piston cavity 3221 while maintaining the axial sealing of the two chambers.

[0060] The inner diameter of the compression ring 326 and the limiting ring 328 can be equal to or greater than the inner diameter of the positioning ring 322, so that the cable can pass through the inner hole thereof. The expansion sealing ring 327 can be an annular structure made of a high-resilience material, which can be elastically deformed under external force. In the initial state without external force, the outer diameter of the expansion sealing ring 327 is equal to the inner diameter of the access pipe 31, and the inner diameter of the expansion sealing ring 327 is equal to the inner diameter of the positioning ring 322. The push rod 329 includes a plurality of push rods 329, which are circumferentially distributed along the axis of the positioning ring 322, and each push rod 329 extends along the axial direction of the positioning ring 322. The positioning ring 322 is provided with a through hole for the push rod 329 to pass through, and the push rod 329 can move in the through hole.

[0061] When the inflation cavity 323 is inflated, the piston ring 325 moves outward under the action of gas pressure, and the compression ring 326 is driven by the push rod 329 to press the expansion sealing ring 327. The expansion sealing ring 327 elastically deforms in the radial direction and expands inward to tightly adhere to the outer wall of the cable, thereby sealing the outer surface of the cable in the circumferential direction. When the gas in the inflation cavity 323 is discharged, the expansion sealing ring 327 returns to the initial state and moves away from the outer surface of the cable, so that the cable can be withdrawn from the access pipe 31 for replacement or maintenance. In this process, the expansion sealing ring 327 uses its elastic potential energy to drive the compression ring 326 to move to the initial position, and the piston ring 325 is driven by the push rod 329 to move to the initial position. Correspondingly, the application adopts a gas pressure driven multi-sealing mechanism to form a multi-stage sealing system with dynamic sealing of the expansion sealing cylinder 321 and the expansion sealing ring 327, thereby further improving the sealing performance.

[0062] In some embodiments, referring to Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 The outer surface of the access pipe 31 is further provided with an exhaust valve 312 communicating with the inflation cavity 323, and the inflation valve 311 and the exhaust valve 312 are respectively arranged on opposite sides of the access pipe 31. For example, the inflation valve 311 is arranged at the top of the access pipe 31, and the exhaust valve 312 is arranged at the bottom of the access pipe 31. In order to prevent foreign matter from falling into the inlet of the inflation valve 311, a sealing plug 313 is arranged at the inlet of the inflation valve 311. In operation, the inflation cavity 323 is inflated by using the inflation valve 311, and the gas in the inflation cavity 323 is discharged by using the exhaust valve 312. For example, the inflation valve 311 can be a one-way valve, such as the gas inlet nozzle in CN222508382U, the common gas valve in the prior art or other one-way valves. Such one-way valves only allow air intake, and automatically seal after inflation, without the need for manual valve closing, thereby improving the operation efficiency.

[0063] In some embodiments, referring to Figure 7The end of the access line pipe 31 away from the access line hole 11 is provided with a radial clamping device 33 for clamping the cable radially. Correspondingly, the cable can be clamped by the radial clamping device 33, not only fixing the cable in the center of the access line pipe 31, but also avoiding axial movement of the cable, improving the reliability of the seal.

[0064] The radial clamping device 33 can include a plurality of clamping plates arranged in the access line pipe 31, the plurality of clamping plates are circumferentially arranged, each clamping plate is movably connected with a screw rod penetrating the access line pipe 31 along the radial direction of the access line pipe 31, the screw rod is threadedly connected with the access line pipe 31 and the end of the screw rod is rotatably connected with the clamping plate. In operation, the screw rod is rotated to drive the clamping plate to move radially inward along the access line pipe 31 to clamp and fix the cable by the plurality of clamping plates; the screw rod is reversely rotated to drive the clamping plate to move radially outward along the access line pipe 31 to release the fixation of the cable.

[0065] In some embodiments, referring to Figure 10 The radial clamping device 33 includes a plurality of arc-shaped plates 331 arranged in the access line pipe 31 along the circumferential direction, each arc-shaped plate 331 is connected with a guide rod 332 penetrating the wall of the access line pipe 31 along the radial direction of the access line pipe 31, the guide rod 332 is movable along the axial direction, the outer end of the guide rod 332 is connected with a limiting block 333, the limiting block 333 and the access line pipe 31 are provided with a spring 334 sleeved on the guide rod 332, the inner hole of the access line pipe 31 is threadedly connected with a pressing pipe 335, the end of the pressing pipe 335 extends to the inner surface of the access line pipe 31 and the outer surface of the arc-shaped plate 331, and a guide conical surface 336 is formed between the inner surface of the end of the pressing pipe 335 and the outer surface of the end of the arc-shaped plate 331.

[0066] Specifically, the arc-shaped plate 331 can include four plates arranged circumferentially along the access line pipe 31, the inner diameter of the pressing pipe 335 is larger than the outer diameter of the cable, so that the cable can pass through the pressing pipe 335, the outer surface of the pressing pipe is provided with an external thread section, and the inner surface of the access line pipe 31 is provided with an internal thread section threadedly connected with the external thread section. The access line pipe 31 is provided with a guide hole for the guide rod 332 to pass through, and the guide rod 332 is movable in the guide hole.

[0067] When the cable passes through the pressing pipe 335, the pressing pipe 335 is held and rotated in the positive direction, so that the pressing pipe 335 moves towards the arc-shaped plate 331, and through the cooperation of the guide cone surface 336, the plurality of arc-shaped plates 331 are driven to move synchronously along the radial direction of the lead-through pipe 31 and abut against the outer surface of the cable, so as to clamp and fix the cable in the center of the lead-through pipe 31, preventing the cable from moving axially in the subsequent process; in this process, the arc-shaped plate 331 drives the limiting block 333 to move close to the lead-through pipe 31 through the guide rod 332, so that the spring 334 is compressed to store elastic potential energy. When it is necessary to release the fixation of the cable, the pressing pipe 335 is only needed to be reversed to the initial position, the spring 334 drives the limiting block 333 to move away from the lead-through pipe 31, and the limiting block 333 drives the arc-shaped plate 331 to move away from the cable through the guide rod 332, so as to release the fixation of the cable. Further, the outer end of the pressing pipe 335 is provided with a flange extending radially outwardly; in operation, the operator can hold the flange to drive the pressing pipe 335 to rotate.

[0068] In some embodiments, referring to Figure 10 , the inner surface of the pressing pipe 335 is provided with an embedding groove 3351 arranged circumferentially, and the embedding groove 3351 is provided with a water stop 337. The water stop 337 is made of a mixture of a high-molecular inorganic water-absorbing and expanding material and rubber, and has the characteristic of expanding when encountering water.

[0069] Correspondingly, in the normal use process, if liquid water seeps into the gap between the pressing pipe 335 and the cable, the water stop 337 expands radially after encountering water, increases in volume and tightly fills the gap between the pressing pipe 335 and the cable, forms a continuous elastic water stop ring and continuously applies radial pressure, so as to block the water seepage channel and prevent water from further penetrating.

[0070] In some embodiments, referring to Figure 6 , Figure 7 , Figure 11 , the inner surface of the end of the lead-through pipe 31 towards the lead-through hole 11 is connected with a mounting ring 34, and the inner hole of the mounting ring 34 is connected with a flange sealing lip 35. The inner diameter of the mounting ring 34 is greater than the inner diameter of the positioning ring 322. The flange sealing lip 35 is a circular ring structure made of elastic material, and the inner diameter thereof is smaller than the outer diameter of the cable; the flange sealing lip 35 can also be a circular structure, and the center thereof is provided with a cross-shaped slot, and the diameter of the circumscribed circle of the cross-shaped slot is smaller than the outer diameter of the cable. After the cable passes through the flange sealing lip 35, the flange sealing lip 35 is radially compressed under the common support of the mounting ring 34, so as to not only make the cable tend to the center of the lead-through pipe 31, but also make the flange sealing lip 35 tightly adhere to the outer wall of the cable after being turned over, so as to seal the cable.

[0071] One end of the inlet and outlet line pipe 31 can be welded to the inlet and outlet hole 11. In some embodiments, referring to Figure 7 , the inlet and outlet line pipe 31 is detachably connected to the inlet and outlet hole 11 by a detachable structure 36. Accordingly, the inlet and outlet line pipe 31 can be detached from the cabinet 1 for replacement or maintenance by providing the detachable structure 36. For example, the detachable structure 36 can be a flange bolt structure, a threaded structure, etc.

[0072] In some embodiments, the outer diameter of the inlet and outlet line pipe 31 is smaller than the inner diameter of the inlet and outlet hole 11, so that the inlet and outlet line pipe 31 can be arranged in the inlet and outlet hole 11. Referring to Figure 11 , the detachable structure 36 includes an external threaded section arranged on the outer surface of the right end of the inlet and outlet line pipe 31, a locking nut 361 threaded to the external threaded section, a fixing ring 362 fixedly connected to the left side of the locking nut 361, a first sealing gasket 363 arranged between the fixing ring 362 and the locking nut 361 and sleeved on the inlet and outlet line pipe 31, and the outer diameters of the locking nut 361, the fixing ring 362, and the first sealing gasket 363 are all greater than the inner diameter of the inlet and outlet hole 11. During installation, the locking nut 361 is first detached, the inlet and outlet line pipe 31 is then arranged in the inlet and outlet hole 11 until the first sealing gasket 363 contacts the outer wall of the cabinet 1, the locking nut 361 is then threaded to the external threaded section of the inlet and outlet line pipe 31, and the locking nut 361 is tightened, thereby achieving the sealed connection between the inlet and outlet line pipe 31 and the inlet and outlet hole 11.

[0073] In some embodiments, the inlet and outlet line pipe 31 is further sleeved with a second sealing gasket 364 and a third sealing gasket 365 in sequence between the first sealing gasket 363 and the locking nut 361 in the direction from the first sealing gasket 363 to the locking nut 361, the outer diameter of the second sealing gasket 364 is equal to the inner diameter of the inlet and outlet hole 11, the length of the second sealing gasket 364 is equal to the wall thickness of the cabinet 1, and the outer diameter of the third sealing gasket 365 is greater than the inner diameter of the inlet and outlet hole 11. During installation, the locking nut 361 and the third sealing gasket 365 are first detached, the inlet and outlet line pipe 31 and the second sealing gasket 364 are then arranged in the inlet and outlet hole 11 until the first sealing gasket 363 contacts the outer wall of the cabinet 1, the third sealing gasket 365 is then sleeved on the inlet and outlet line pipe 31, the locking nut 361 is then threaded to the external threaded section of the inlet and outlet line pipe 31, and the locking nut 361 is tightened, thereby achieving the sealed connection between the inlet and outlet line pipe 31 and the inlet and outlet hole 11.

[0074] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A power distribution cabinet incoming-outgoing line sealing device, comprising an incoming-outgoing line pipe (31), one end of the incoming-outgoing line pipe (31) being used for connecting with an incoming-outgoing line hole (11) of a cabinet body (1); characterized in that, The inlet and outlet line pipe (31) is internally provided with a positioning and sealing assembly (32), the positioning and sealing assembly (32) comprises an elastically deformable expansion sealing cylinder (321) and two positioning rings (322) connected at two ends of the expansion sealing cylinder (321) respectively, the positioning ring (322) is sealingly connected with the inner surface of the inlet and outlet line pipe (31), and a sealed inflation cavity (323) is surrounded between the inlet and outlet line pipe (31), the expansion sealing cylinder (321) and the two positioning rings (322), and the outer surface of the inlet and outlet line pipe (31) is provided with an inflation valve (311) in communication with the inflation cavity (323).

2. The electrical switchgear access seal of claim 1, wherein, The inflation cavity (323) is internally provided with a plurality of fixing rods (324), the plurality of fixing rods (324) are uniformly distributed along the circumference of the positioning ring (322), and two ends of each fixing rod (324) are connected with the two positioning rings (322) respectively.

3. The electrical switchgear access seal of claim 2, wherein, The expansion sealing cylinder (321) comprises at least two spacer rings (3211) arranged coaxially and spaced apart, a cylindrical expansion wall (3212) connected between any two adjacent spacer rings (3211) and elastically deformable, and two outermost spacer rings (3211) are sealingly connected with the two positioning rings (322) respectively, and the spacer ring (3211) is connected with the fixing rod (324).

4. The electrical switchgear access seal of claim 1, wherein, The end face of the positioning ring (322) in the inflation cavity (323) is provided with an annular piston cavity (3221) arranged coaxially, and the annular piston cavity (3221) is sealingly fitted with a piston ring (325) sliding in the axial direction thereof; One side of the positioning ring (322) outside the inflation cavity (323) is coaxially provided with a compression ring (326), an elastically deformable expansion sealing ring (327) and a limiting ring (328) in sequence away from the inflation cavity (323), the limiting ring (328) is connected with the inner surface of the inlet and outlet line pipe (31), the compression ring (326) is fixed with a push rod (329) penetrating the positioning ring (322) in the axial direction thereof and connected with the piston ring (325), and the push rod (329) is movable in the axial direction thereof.

5. The electrical switchgear access seal of claim 1, wherein, The inlet and outlet line pipe (31) is provided with a radial clamping device (33) away from the inlet and outlet hole (11), and the radial clamping device (33) is used for radially clamping the cable.

6. The electrical switchgear access seal of claim 5, wherein, The radial clamping device (33) comprises a plurality of arc-shaped plates (331) arranged in the access line pipe (31) and along the circumference thereof, each of the arc-shaped plates (331) is connected with a guide rod (332) penetrating the pipe wall of the access line pipe (31) along the radial direction thereof, the guide rod (332) is movable along the axial direction thereof, the outer end of the guide rod (332) is connected with a limiting block (333), a spring (334) is arranged between the limiting block (333) and the access line pipe (31) and sleeved on the guide rod (332), the inner hole of the access line pipe (31) is threadedly connected with a pressing pipe (335), the end of the pressing pipe (335) extends to the inner surface of the access line pipe and the outer surface of the arc-shaped plate (331), and a matched guide conical surface (336) is formed between the inner surface of the end of the pressing pipe (335) and the outer surface of the end of the arc-shaped plate (331).

7. The electrical switchgear access seal of claim 6, wherein, The inner surface of the pressing pipe (335) is provided with an embedding groove (3351) arranged along the circumference thereof, and a water stop strip (337) is arranged in the embedding groove (3351).

8. The electrical switchgear access seal of claim 1, wherein, The inner surface of one end of the access line pipe (31) facing the access line hole (11) is connected with a mounting ring (34), and the inner hole of the mounting ring (34) is connected with a turned-up sealing lip (35).

9. The electrical switchgear lead-through seal of claim 1, wherein, The access line pipe (31) and the access line hole (11) are sealingly connected in a detachable structure (36).

10. A power distribution cabinet, comprising a cabinet body (1) and a cabinet door (2), a side wall of the cabinet body (1) is provided with an access hole (11), an access line sealing device (3) is connected at the access hole (11), characterized in that, The access line sealing device (3) is the power distribution cabinet access line sealing device in any one of claims 1 to 9.

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