A cable outdoor terminal capable of balancing internal pressure

Abstract

The present invention discloses an outdoor cable terminal capable of balancing internal pressure, which relates to the technical field of cable terminals, and comprises a cable terminal body, a connecting device and a membrane body, wherein a first chamber is provided inside the cable terminal body, and the first chamber is filled with an insulating material; the connecting device is arranged on the cable terminal body, and the connecting device has a first end and a second end that are connected, and the first end of the connecting device is connected to the external environment; the membrane body is arranged in the first chamber, and the membrane body encloses a second chamber with a variable volume, and the first chamber is not connected to the second chamber, and the second chamber is connected to the second end of the connecting device. The outdoor cable terminal capable of balancing internal pressure of the present invention can release pressure when thermal expansion occurs inside the cable terminal, and can replenish pressure when the temperature drops and shrinks, so as to always maintain the internal balance of the cable terminal.

Description

Technical Field

[0001] The invention relates to the technical field of cable terminals, and in particular to an outdoor cable terminal capable of balancing internal pressure. Background Art

[0002] The cable terminal generally includes a cable and a sleeve that is sleeved on the outside of the cable. In order to facilitate the connection of the conductive terminal at the end of the cable, the insulation layer of the cable in the sleeve will be stripped, and at the same time, in order to restore the insulation capacity of the cable, an insulating material will be filled between the cable and the sleeve.

[0003] Commonly used insulating materials are liquid insulating agents, such as silicone oil, polyisobutylene, silicone gel, etc. The volume of these insulating materials is easily affected by temperature changes. Therefore, the space between the cable and the casing is not completely filled with insulating materials, but a cavity at a certain distance is reserved. When the cable terminal is in operation, the current flowing through the cable will generate heat, which will radiate to the inside of the cable terminal, causing the temperature of the insulating material to rise, and the insulating material will expand due to thermal expansion and increase in volume. The interior of the cable terminal is airtight. As the volume of the insulating material increases, it will squeeze and compress the gas in the cavity, increasing the air pressure inside the cable terminal. The structure of the cable terminal will be under great pressure, especially the sealing structure at the bottom of the cable terminal. It is easy to age and fail due to long-term exposure to high pressure and heat, resulting in leakage of the insulating material and damage to the cable terminal. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an outdoor cable terminal capable of balancing internal pressure, which can release pressure when thermal expansion occurs inside the cable terminal and replenish pressure when the temperature drops and contracts, thereby always maintaining the internal balance of the cable terminal.

[0005] The cable outdoor terminal capable of balancing internal pressure according to an embodiment of the present invention comprises a cable terminal body, wherein a first chamber is provided inside the cable terminal body, and the first chamber is filled with an insulating material;

[0006] A communication device, the communication device is arranged on the cable terminal body, the communication device has a first end and a second end that are in communication, and the first end of the communication device is in communication with the external environment;

[0007] A membrane body is arranged in the first chamber, the membrane body encloses a second chamber with a variable volume, the first chamber is not connected to the second chamber, and the second chamber is connected to the second end of the communication device.

[0008] The cable outdoor terminal capable of balancing internal pressure according to the embodiment of the present invention has at least the following beneficial effects: the membrane body encloses a second chamber, the second chamber occupies part of the volume of the first chamber, and the volume of the second chamber is variable, when the insulating material in the first chamber expands due to heat, the membrane body can be squeezed to reduce the volume of the second chamber, and the gas in the second chamber can be discharged to the external environment through the connecting device, thereby reducing the pressure increased by the thermal expansion of the insulating material; when the insulating material cools down and contracts, the gas in the external environment can enter the second chamber again through the connecting device, thereby increasing the volume of the second chamber and supplementing the negative pressure generated by the contraction of the insulating material; the gas in the external environment always flows in the second chamber, will not cause pollution to the first chamber and the insulating material, will not change the physical properties inside the cable terminal, and the cable terminal can operate stably and safely.

[0009] According to some embodiments of the present invention, the connecting device includes a filtering component and a conducting component, the conducting component is passed through the cable terminal body, the second chamber is connected to one end of the conducting component, the filtering component is connected to the other end of the conducting component, and the filtering component is connected to the external environment.

[0010] According to some embodiments of the present invention, the filter assembly includes a first shell and filter material, the first shell has a filter cavity, the first shell is provided with a first through hole, the first through hole connects the filter cavity with the external environment, the first shell is provided with a second through hole, the second through hole connects the filter cavity with the conductive assembly, and the filter material is filled in the filter cavity and is located between the first through hole and the second through hole.

[0011] According to some embodiments of the present invention, the conduction component includes a conduit and a second shell, the second shell is arranged in the second chamber, the second shell has a third chamber, the second shell is provided with a third through hole, the second chamber is connected to the third chamber through the third through hole, one end of the conduit is connected to the filter assembly, and the other end of the conduit extends into the third chamber.

[0012] According to some embodiments of the present invention, the conduit is arranged vertically, a barrier liquid is added to the third chamber, a liquid level of the barrier liquid is higher than a port of the conduit, and a liquid level of the barrier liquid is lower than the third through hole.

[0013] According to some embodiments of the present invention, a third shell is provided between the conduit and the filter assembly, the third shell has a fourth chamber, the fourth chamber is communicated with the filter assembly, and the fourth chamber is communicated with the third chamber through the conduit.

[0014] According to some embodiments of the present invention, the cable terminal body has a cover, which is arranged on the first chamber, the conductive component also includes a first connecting plate and a second connecting plate, the conduit is arranged on one side surface of the first connecting plate, and the other side surface of the first connecting plate is connected to the filtering component, the second shell is arranged on one side surface of the second connecting plate, and the other side surface of the second connecting plate is attached to the cover, and the second connecting plate is located in the first chamber, the first connecting plate is attached to the cover, and the first connecting plate is located on the opposite side of the second connecting plate, and the conduit passes through the cover and extends into the third chamber.

[0015] According to some embodiments of the present invention, the cable terminal body is provided with a protective cover, and the connecting device is provided on the inner side of the protective cover.

[0016] According to some embodiments of the present invention, the cable terminal body includes a cable and a sleeve, the sleeve is sleeved on the cable, the first chamber is formed between the sleeve and the cable, the cable is sleeved with a stress cone, the stress cone is located in the first chamber, the outer surface of the stress cone is provided with a first cone surface, and a cone cover is provided, the cone cover is sleeved on the stress cone, the surface of the cone cover in contact with the stress cone is provided with a second cone surface, and the first cone surface and the second cone surface are abutted to form a seal.

[0017] According to some embodiments of the present invention, an elastic component is provided, one end of which is fixed, and the other end of which is connected to the stress cone, and the elastic component is configured to drive the stress cone to abut against the cone cover.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 It is a partial structural schematic diagram of an outdoor cable terminal capable of balancing internal pressure according to an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a communication device according to an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the filter component and the conduction component of an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of a conducting component according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic structural diagram of an outdoor cable terminal capable of balancing internal pressure according to an embodiment of the present invention;

[0025] Figure 6 It is a schematic structural diagram of a stress cone and a cone cover according to an embodiment of the present invention.

[0026] Figure Number:

[0027] Cable terminal body 100, protective cover 110, cable 120, sleeve 130, stress cone 140, cone cover 150, elastic component 160, connecting device 200, filter component 210, first shell 211, filter material 212, first through hole 213, second through hole 214, conducting component 220, conduit 221, second shell 222, third through hole 223, barrier liquid 224, third shell 225, first connecting plate 226, second connecting plate 227, membrane body 300, cover 400, cone support 500. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] The cable terminal generally includes a cable and a sleeve that is sleeved on the outside of the cable. In order to facilitate the connection of the conductive terminal at the end of the cable, the insulation layer of the cable in the sleeve will be stripped, and at the same time, in order to restore the insulation capacity of the cable terminal, an insulating material will be filled between the cable and the sleeve.

[0033] Commonly used insulating materials are liquid insulating agents, such as silicone oil, polyisobutylene, silicone gel, etc., but the volume of these insulating materials is easily changed by temperature changes. Therefore, the space between the cable and the casing is not completely filled with the above-mentioned insulating materials, but a cavity of a certain distance is reserved. The cavity is generally occupied by air, which can be compressed and can adapt to the volume change of the insulating material within a certain range. In order to prevent the leakage of the insulating material and ensure that the insulating material is not contaminated and the insulating properties are changed, the interior of the cable terminal is a closed structure, that is, the insulating material is filled between the cable and the casing, and the cable terminal is sealed.

[0034] When the cable terminal is in operation, the current flowing through the cable has a thermal effect, and the generated heat is radiated to the inside of the cable terminal, causing the temperature of the insulation to rise. The thermal expansion of the insulation causes the volume to increase. However, the inside of the cable terminal is sealed, and while the volume of the insulation increases, the volume of the cavity decreases, and the gas in the cavity is squeezed and compressed, causing the air pressure inside the cable terminal to increase. The increase in air pressure inside the cable terminal will exert greater pressure on the structure of the cable terminal, especially the sealing structure at the bottom of the cable terminal, which is prone to aging and failure under long-term high pressure and heat conditions, causing leakage of insulation and damage to the cable terminal, or even the cable terminal explodes due to high internal pressure.

[0035] Reference Figure 1 As shown, an outdoor cable terminal capable of balancing internal pressure according to an embodiment of the present invention includes a cable terminal body 100 , a connecting device 200 and a membrane body 300 .

[0036] The cable terminal body 100 has a first chamber therein, and the first chamber is filled with an insulating material.

[0037] The first chamber is the gap between the cable and the casing. The insulating material filled in the first chamber is used to maintain the insulation of the cable. The insulating material can be injected with silicone oil, polyisobutylene or silicone gel. Generally speaking, the cable terminal body 100 is arranged vertically, that is, the first chamber is distributed vertically. After the insulating material is filled into the first chamber, it occupies the bottom of the first chamber. The insulating material filled in the first chamber will maintain its liquid level at 70% to 80% of the height of the first chamber, and the remaining part of the first chamber is used to set the membrane body 300.

[0038] Reference Figure 2 As shown, the connecting device 200 is arranged on the cable terminal body 100, and the connecting device 200 has a first end and a second end that are connected, and the first end of the connecting device 200 is connected to the external environment; the membrane body 300 is arranged in the first chamber, and the membrane body 300 encloses a second chamber with a variable volume, and the first chamber is not connected to the second chamber, and the second chamber is connected to the second end of the connecting device 200.

[0039] The membrane body 300 is disposed in the first chamber, and the membrane body 300 itself encloses a second chamber. The membrane body 300 can be made of a flexible material, which can change the shape of the membrane body 300 to achieve a variable volume of the second chamber. The second chamber enclosed by the membrane body 300 occupies the remaining part of the first chamber, that is, the first chamber is jointly occupied by the insulating material and the second chamber. The second chamber is not filled with other solids or liquids, so the second chamber is generally filled with air.

[0040] The second chamber is connected to the external environment through the connecting device 200. When the volume of the second chamber changes, for example, the volume of the second chamber decreases, the air in the second chamber is squeezed out of the connecting device 200 to the external environment, so the pressure in the second chamber is in a balanced state. If the volume of the second chamber increases, the air in the external environment can re-enter the second chamber through the connecting device 200 to avoid the pressure of the second chamber from decreasing. Therefore, the pressure of the second chamber is maintained near the normal atmospheric pressure.

[0041] The volume change of the second chamber is caused by the volume change of the insulator. When the cable terminal body 100 is working, the heat effect generated by the current radiates into the first chamber, and the insulator expands due to the heat, and the volume increases. The volume of the first chamber is fixed, so the insulator will squeeze the membrane 300, and the deformation of the membrane 300 will cause the volume of the second chamber to decrease. Since the working current of the cable terminal body 100 is not constant, the heat generated in different time periods is changing, and the temperature of the insulator also changes due to the change in the temperature of the external environment. Therefore, when the temperature of the insulator drops, the volume of the insulator will shrink again, forming cavities with negative pressure in the first chamber, and these cavities will be filled by the membrane 300, that is, the volume of the second chamber increases.

[0042] It should be understood that the volume change of the insulating material in the first chamber is adjusted by the volume change of the second chamber, so that the pressure in the first chamber is at a constant value, and generally the pressure is maintained near the atmospheric pressure. The first chamber and the second chamber are not connected, so the moisture, particulate matter and other pollutants in the external environment will not enter the first chamber to contaminate the insulating material, and the insulating material will not leak into the external environment. The insulation of the cable terminal body 100 is guaranteed, and the cable terminal body 100 can operate stably and safely.

[0043] Reference Figure 2 As shown, it can be understood that the connecting device 200 includes a filter component 210 and a conductive component 220, the conductive component 220 is passed through the cable terminal body 100, the second chamber is connected to one end of the conductive component 220, the filter component 210 is connected to the other end of the conductive component 220, and the filter component 210 is connected to the external environment.

[0044] The gas in the second chamber is connected to the external environment through the conduction component 220 to maintain a constant pressure in the second chamber. At the same time, before entering the second chamber, the gas or air must pass through the filter component 210 to block the moisture, impurities and other solid particles in the air in the filter component 210. If the moisture, impurities and other solid particles in the air enter the second chamber through the conduction component 220, liquid water will be formed in the second chamber, or large pieces of solid impurities will be accumulated, or a mixture of water and solid impurities will be formed. These substances will all lead to a reduction in the volume of the second chamber, so that the pressure regulation ability of the second chamber is reduced. In addition, the solid impurities may damage the membrane body 300 during the movement, and even cause the membrane body 300 to rupture, thereby connecting the first chamber and the second chamber, and the insulation structure of the cable terminal body 100 will be destroyed.

[0045] Reference Figure 3 As shown, it can be understood that the filter assembly 210 includes a first shell 211 and a filter material 212, the first shell 211 has a filter cavity, the first shell 211 is provided with a first through hole 213, the first through hole 213 connects the filter cavity with the external environment, the first shell 211 is provided with a second through hole 214, the second through hole 214 connects the filter cavity with the conduction assembly 220, and the filter material 212 is filled in the filter cavity and is located between the first through hole 213 and the second through hole 214.

[0046] Generally, the first through hole 213 is arranged at the top position of the first shell 211, and the second through hole 214 is arranged at the bottom position of the first shell 211. Because the filter material 212 is accumulated at the bottom of the filter chamber due to gravity, the first through hole 213 is arranged at the top, and the second through hole 214 is arranged at the bottom, which can satisfy that the filter material 212 is between the first through hole 213 and the second through hole 214. The external air entering the filter chamber through the first through hole 213 must pass through the filter material before entering the second through hole 214. In the above structure, the conduction component 220 is arranged at the bottom of the first shell 211, which facilitates the communication between the conduction component 220 and the second through hole 214.

[0047] It should be understood that the filter material is preferably a granular filter material, which can form more pores in the filter cavity, less obstruction to the flow of air, and can increase the contact area between the air and the filter material, greatly improving the filtering effect and efficiency of the filter material. Preferably, the filter material can use granular activated carbon or silica particles or ceramic particles.

[0048] Reference Figure 3As shown, it can be understood that the conduction component 220 includes a conduit 221 and a second shell 222, the second shell 222 is arranged in the second chamber, the second shell 222 has a third chamber, the second shell 222 is provided with a third through hole 223, the second chamber and the third chamber are connected through the third through hole 223, one end of the conduit 221 is connected to the filter component 210, and the other end of the conduit 221 extends into the third chamber.

[0049] The third through hole 223 is also preferably provided in the upper half of the second shell 222, and the conduit 221 extends into the third chamber, and the end of the conduit 221 is preferably extended to the bottom near the third chamber. In the above structure, the flow path of the air from the external environment is: passing through the conduit 221 to reach the third chamber, then floating to the upper half of the third chamber, and finally entering the second chamber through the third through hole 223. Even if tiny solid impurities mixed in the air enter the conduit 221, they will be trapped by the third chamber of the second shell 222. The second shell 222 is arranged to cooperate with the arrangement of the conduit 221, the main purpose of which is to form a buffer area for storing solid impurities, and to avoid solid impurities from entering the second chamber to damage the membrane body 300 as much as possible. The second shell 222 is provided as a safety redundancy.

[0050] Reference Figure 3 As shown, it can be understood that the conduit 221 is vertically arranged, the third chamber is added with a barrier liquid 224 , the liquid level of the barrier liquid 224 is higher than the port of the conduit 221 , and the liquid level of the barrier liquid 224 is lower than the third through hole 223 .

[0051] When the volume of the second chamber decreases, the air in the second chamber is squeezed into the third chamber, and the air further pushes the barrier liquid 224 to make the barrier liquid 224 rise along the conduit 221, while the air in the upper part of the conduit 221 can still pass through the filter assembly 210 to reach the external environment, so the pressure in the second chamber can still be balanced. When the volume of the second chamber increases, the air in the external environment can re-enter the upper part of the conduit 221 through the filter assembly 210. At this time, the barrier liquid 224 in the conduit 221 will drop back to the third chamber, and the air in the third chamber can return to the second chamber, so the pressure in the second chamber can still be balanced. The barrier liquid 224 can enter the conduit 221 and move, and can maintain the pressure balance at the upper and lower ends of the conduit 221. The liquid level of the barrier liquid 224 is higher than the port of the conduit 221 and lower than the third through hole 223. While the barrier liquid 224 plays a sealing and isolation role, it can also allow the second chamber to retain its original function of regulating pressure balance.

[0052] It is understandable that a third shell 225 is provided between the conduit 221 and the filter assembly 210 , the third shell 225 has a fourth chamber, the fourth chamber is communicated with the filter assembly 210 , and the fourth chamber is communicated with the third chamber through the conduit 221 .

[0053] Furthermore, if the volume change of the second chamber is large, the volume of the second chamber is greatly reduced, the amount of barrier liquid 224 entering the conduit 221 will increase, and the conduit 221 may not be able to accommodate the barrier liquid 224. A third housing 225 having a fourth chamber is provided between the conduit 221 and the filter assembly 210, and the barrier liquid 224 can enter the fourth chamber for temporary storage.

[0054] For example, if the cable generates a lot of heat, the volume of the insulation material expands greatly, causing the volume of the second chamber to decrease more. The air in the second chamber is squeezed into the third chamber, further squeezing the barrier liquid 224 into the conduit 221. The barrier liquid 224 in the conduit 221 enters the fourth chamber, so that the conduit 221 is connected to the air again, and the air pressure in the second chamber is balanced. When the volume of the second chamber tends to be stable, the air in the second chamber no longer enters the third chamber, and the barrier liquid 224 can flow back to the third chamber along the conduit 221 under the influence of gravity, and re-form a liquid seal. When the cable working condition changes and the heat generation decreases, the cooling volume of the insulation material decreases, and the volume of the second chamber increases. The air from the external environment passes through the filter assembly 210 and the fourth chamber to the conduit 221, and enters the third chamber along the conduit 221, and finally passes through the barrier liquid 224 in the form of bubbles to the second chamber for replenishment.

[0055] It should be understood that the position where the conduit 221 communicates with the fourth chamber is preferably set at the lowest position of the fourth chamber. If conditions permit, a guide slope can be provided at the bottom of the fourth chamber, and the conduit 221 is provided at the lowest position of the guide slope and communicated with it.

[0056] Reference Figure 4 As shown, it can be understood that the cable terminal body 100 has a cover 400, which is covered on the first chamber, and the conductive component 220 also includes a first connecting plate 226 and a second connecting plate 227. The conduit 221 is arranged on one side surface of the first connecting plate 226, and the other side surface of the first connecting plate 226 is connected to the filter component 210. The second shell 222 is arranged on one side surface of the second connecting plate 227, and the other side surface of the second connecting plate 227 is attached to the cover 400, and the second connecting plate 227 is located in the first chamber, the first connecting plate 226 is attached to the cover 400, and the first connecting plate 226 is located on the opposite side of the second connecting plate 227, and the conduit 221 passes through the cover 400 and extends into the third chamber.

[0057] The conduction assembly 220 can be divided into two parts according to the first connecting plate 226 and the second connecting plate 227. The first connecting plate 226 and the conduit 221 directly connected thereto constitute the first part; the second connecting plate 227 and the second shell 222 directly connected thereto constitute the second part. The above structure facilitates the installation of the conduction assembly 220 on the cover 400. For example, the second connecting plate 227 is fixed to one side surface of the cover 400 by screws, and the first connecting plate 226 is also fixed to the other side surface of the cover 400 by screws. At the same time, the first connecting plate 226 and the second connecting plate 227 are at positions opposite to each other, and at this time, the conduit 221 can pass through the cover 400 and extend into the second shell 222. Finally, the cover 400 passes through the cable and can be covered on the end of the sleeve, that is, the cover 400 completes the sealing of the first chamber. It should be noted that the second shell 222 is located on one side inside the first chamber, and the filter assembly 210 is located on one side outside the first chamber.

[0058] It should be understood that a through hole can be provided in advance on the cover 400 for the conduit 221 to pass through; a threaded hole can be provided in advance on the cover 400 for screw fixing. Of course, threaded holes can also be omitted in advance, and self-tapping screws can also be used to achieve connection.

[0059] It can be understood that the cable terminal body 100 is provided with a protective cover 110 , and the connecting device 200 is arranged on the inner side of the protective cover 110 .

[0060] In an installation embodiment, a semicircular arc-shaped protective cover 110 can be placed on the sealing cover 400, and the connecting device 200 can be placed in the protective cover 110 for protection. Specifically, it can prevent large solids from falling into the connecting device 200, and can also prevent external liquids from entering the connecting device 200. For example, in rainy weather, rainwater may collect on the surface of the outdoor cable terminal.

[0061] Reference Figure 5 and Figure 6 As shown, it can be understood that the cable terminal body 100 includes a cable 120 and a sleeve 130, the sleeve 130 is sleeved on the cable 120, a first chamber is formed between the sleeve 130 and the cable 120, the cable 120 is sleeved with a stress cone 140, the stress cone 140 is located in the first chamber, the outer surface of the stress cone 140 is provided with a first cone surface, a cone cover 150 is provided, the cone cover 150 is sleeved on the stress cone 140, the surface of the cone cover 150 in contact with the stress cone 140 is provided with a second cone surface, and the first cone surface and the second cone surface are abutted to form a seal.

[0062] The stress cone 140 is used to control the electric field strength inside the cable terminal body 100 to be within the specified design range. At the same time, in order to prevent the insulating material from penetrating into the stress cone 140 and affecting the effect of the stress cone 140, a cone cover 150 is usually provided to be mounted on the outside of the stress cone 140 to form a seal to prevent the insulating material from penetrating.

[0063] It can be understood that in order to further improve the sealing effect between the cone cover 150 and the stress cone 140, an elastic component 160 is also provided, one end of the elastic component 160 is fixed, and the other end of the elastic component 160 is connected to the stress cone 140. The elastic component 160 is configured to drive the stress cone 140 to stick toward the cone cover 150.

[0064] For example, the elastic component 160 is set in a compressed state, and the elastic component 160 can always apply thrust to the stress cone 140, pressing the stress cone 140 toward the cone cover 150. Pressure can always be maintained between the first cone surface and the second cone surface to improve the sealing effect. It should be understood that the elastic component 160 can be a spring, or a combination of multiple springs arranged in parallel. Since the spring is prone to deflection when compressed and does not maintain the axial direction, a rod-shaped object can be set inside the spring to limit and guide the spring. It should be understood that after the spring is pre-compressed to the designed length, it will be in a tendency to stretch, and the spring does not need to be further compressed, so the rod-shaped object set inside the spring will not affect the moving stroke of the spring.

[0065] Further, see Figure 6 As shown, the stress cone 140 is also provided with a third cone surface, and a cone support 500 is added. The cone support 500 is provided with a fourth cone surface. The cone support 500 is arranged between the stress cone 140 and the elastic component 160. The cone support 500 is connected to the elastic component 160, and the elastic component 160 can be configured to be in a pre-compressed state. In the above structure, the elastic component 160 has a tendency to push the cone support 500 to move toward the stress cone 140, and the fourth cone surface is in contact with the third cone surface. At the same time, the force of the fourth cone surface on the third cone surface is maintained toward the central axis of the cable terminal body 100. Through this structure, the stress cone 140 can be closely attached to the cable and the cone cover 150, and excellent sealing effects can be obtained at all parts of the stress cone 140.

[0066] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A cable outdoor terminal capable of balancing internal pressure, characterized in that: include: A cable terminal body (100), wherein a first chamber is provided inside the cable terminal body (100), and the first chamber is filled with an insulating material; A connecting device (200), the connecting device (200) being arranged on the cable terminal body (100), the connecting device (200) having a first end and a second end that are connected, the first end of the connecting device (200) being connected to an external environment; a membrane body (300), the membrane body (300) being arranged in the first chamber, the membrane body (300) enclosing a second chamber with a variable volume, the first chamber being not connected to the second chamber, and the second chamber being connected to the second end of the communication device (200); The communication device (200) comprises a filter component (210) and a conduction component (220), the conduction component (220) is disposed through the cable terminal body (100), the second chamber is communicated with one end of the conduction component (220), the filter component (210) is connected with the other end of the conduction component (220), and the filter component (210) is communicated with the external environment; The conduction component (220) comprises a conduit (221) and a second shell (222); the second shell (222) is arranged in the second chamber; the second shell (222) has a third chamber; the second shell (222) is provided with a third through hole (223); the second chamber is communicated with the third chamber via the third through hole (223); one end of the conduit (221) is communicated with the filter component (210); the other end of the conduit (221) extends into the third chamber; The conduit (221) is arranged vertically, and a barrier liquid (224) is added to the third chamber, the liquid level of the barrier liquid (224) is higher than the port of the conduit (221), and the liquid level of the barrier liquid (224) is lower than the third through hole (223).

2. The cable outdoor terminal capable of balancing internal pressure according to claim 1, characterized in that: The filter assembly (210) comprises a first shell (211) and filter material (212); the first shell (211) has a filter cavity; the first shell (211) is provided with a first through hole (213); the first through hole (213) connects the filter cavity with the external environment; the first shell (211) is provided with a second through hole (214); the second through hole (214) connects the filter cavity with the conduction assembly (220); the filter material (212) is filled in the filter cavity and is located between the first through hole (213) and the second through hole (214).

3. The cable outdoor terminal capable of balancing internal pressure according to claim 1, characterized in that: A third shell (225) is provided between the conduit (221) and the filter assembly (210); the third shell (225) has a fourth chamber; the fourth chamber is in communication with the filter assembly (210); and the fourth chamber is in communication with the third chamber via the conduit (221).

4. The cable outdoor terminal capable of balancing internal pressure according to any one of claim 3, characterized in that: The cable terminal body (100) has a cover (400), and the cover (400) is covered on the first chamber. The conduction component (220) also includes a first connecting plate (226) and a second connecting plate (227). The conduit (221) is arranged on a side surface of the first connecting plate (226), and the other side surface of the first connecting plate (226) is connected to the filter component (210). The second shell (222) is arranged on a side surface of the second connecting plate (227), and the other side surface of the second connecting plate (227) is attached to the cover (400), and the second connecting plate (227) is located in the first chamber. The first connecting plate (226) is attached to the cover (400), and the first connecting plate (226) is located on the opposite side of the second connecting plate (227). The conduit (221) passes through the cover (400) and extends into the third chamber.

5. The cable outdoor terminal capable of balancing internal pressure according to claim 1, characterized in that: The cable terminal body (100) is provided with a protective cover (110), and the connecting device (200) is arranged on the inner side of the protective cover (110).

6. The cable outdoor terminal capable of balancing internal pressure according to claim 1, characterized in that: The cable terminal body (100) comprises a cable (120) and a sleeve (130), wherein the sleeve (130) is sleeved on the cable (120), wherein the first chamber is formed between the sleeve (130) and the cable (120), wherein the cable (120) is sleeved with a stress cone (140), wherein the stress cone (140) is located in the first chamber, wherein the outer surface of the stress cone (140) is provided with a first cone surface, and a cone cover (150) is provided, wherein the cone cover (150) is sleeved on the stress cone (140), wherein the surface of the cone cover (150) in contact with the stress cone (140) is provided with a second cone surface, and wherein the first cone surface and the second cone surface are in contact with each other to form a seal.

7. The cable outdoor terminal capable of balancing internal pressure according to claim 6, characterized in that: An elastic component (160) is provided, one end of the elastic component (160) is fixed, the other end of the elastic component (160) is connected to the stress cone (140), and the elastic component (160) is configured to drive the stress cone (140) to abut against the cone cover (150).

Images