A transmission cable and a connection structure between the sensor and the transmission cable.

Abstract

This utility model relates to the field of sensor technology, and more particularly to a transmission cable, comprising a cable, a cable conduit, a first connector, an inner joint, a sealing ring, and a union nut. The cable conduit surrounds the cable. The first connector is connected to one end of the cable. The inner joint is connected to one end of the cable conduit and is located outside the first connector. A first conical surface is formed on the outer peripheral surface of the inner joint, and a sealing ring groove is formed on the first conical surface. The sealing ring is disposed in the sealing ring groove and partially extends out of the sealing ring groove. The union nut is disposed outside the inner joint for threaded connection with a sensor. A connection structure between a sensor and a transmission cable is also provided. Compared with the prior art, the transmission cable and the connection structure between the sensor and the transmission cable of this utility model are simple to assemble and disassemble, reducing assembly and disassembly time, and also have good sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a transmission cable and a connection structure between the sensor and the transmission cable. Background Technology

[0002] A sensor is a detection device that can sense the information being measured and transform that information into an electrical signal or other required form of output according to a certain rule, in order to meet the requirements of information transmission, processing, storage, display, recording, and control. Sensors are widely used in various fields, and different types of sensors can play different roles in the production process. For example, in the metallurgical industry, liquid level sensors are commonly used to detect the height of the molten material in the furnace, thereby facilitating subsequent operations.

[0003] Sensors require connection to transmission cables for signal transmission and power supply. However, current technologies suffer from complex assembly and disassembly procedures, and poor sealing over extended periods. For example, in the metallurgical industry, level sensors typically use bolted connections at the cable ends, requiring multiple bolts for connection. This complex process necessitates specialized tools and is time-consuming, hindering rapid equipment maintenance in metallurgical settings. Furthermore, bolts are prone to corrosion at high temperatures, further complicating assembly and disassembly. Additionally, the direct pressure between the level sensor and transmission cable using a flat surface against a sealing ring makes pre-compression difficult to control, leading to material deformation or aging and loss of sealing over time, allowing liquid or dust intrusion. Utility Model Content

[0004] To address the technical problems of existing technologies where transmission cables and sensors are connected and fixed using bolts, resulting in cumbersome and time-consuming assembly and disassembly processes, as well as unreasonable sealing structure designs that fail to guarantee sealing performance, this utility model provides a transmission cable with a union nut. This union nut facilitates connection and fixation to the sensor, simplifying the assembly and disassembly process and reducing time consumption. Furthermore, the groove for installing the sealing ring features a tapered surface. After connection with the sensor, the fit between the tapered surfaces ensures sufficient pre-compression of the sealing ring, guaranteeing sealing performance and extending its lifespan.

[0005] A transmission cable includes a cable, a cable conduit, a first connector, an inner joint, a sealing ring, and a union nut.

[0006] The cable conduit surrounds the outside of the cable;

[0007] The first connector is connected to one end of the cable;

[0008] The inner connector is connected to one end of the cable conduit and is located outside the first connector; the outer peripheral surface of the inner connector is provided with a first conical surface, and a sealing ring groove is provided on the first conical surface;

[0009] The sealing ring is disposed in the sealing ring groove and extends partially out of the sealing ring groove;

[0010] The live nut is located outside the inner connector for threaded connection with the sensor.

[0011] Preferably, the tail end of the live connector nut is connected to an elastic element.

[0012] Preferably, it further includes a limiting member, the elastic member being connected between the limiting member and the union nut, and the limiting member being provided with a limiting pin, the limiting pin being used to limit the position of the limiting member.

[0013] Preferably, the inner connector is clamped to one end of the cable conduit.

[0014] Preferably, the first tapered surface is formed at the front end of the outer peripheral surface of the inner connector.

[0015] Preferably, the inner connector includes a clamping part, a connecting part, and a mating part arranged sequentially;

[0016] The clamping part is clamped and connected to one end of the cable pipe;

[0017] The outer peripheral surface of the connecting part is provided with a boss protruding outward, and the tail end of the live joint nut is provided with an extension wall extending inward, and the boss is used to block the extension wall.

[0018] The first conical surface is formed on the outer peripheral surface of the docking portion.

[0019] Preferably, the front end of the docking part is further provided with an extension, the extension is a ring structure, and a positioning structure is provided on the extension.

[0020] Preferably, the cable is a multi-core cable, and the first connector is a socket core with multiple sockets.

[0021] A connection structure between a sensor and a transmission cable, comprising a sensor and a transmission cable as described in any one of the above descriptions;

[0022] One end of the sensor is provided with a connector and a second connector, the connector being located outside the second connector;

[0023] The connecting joint is inserted between the inner joint and the live joint nut, and is threadedly connected to the live joint nut; the inner circumferential surface of the connecting joint is provided with a second conical surface that matches the first conical surface, and the second conical surface cooperates with the first conical surface to press the sealing ring tightly;

[0024] The second connector is connected to the first connector.

[0025] Preferably, the sensor is a liquid level sensor.

[0026] Compared with existing technologies, this utility model provides a transmission cable comprising a cable, a cable conduit, a first connector, an inner joint, a sealing ring, and a union nut. The cable conduit surrounds the cable. The first connector is connected to one end of the cable. The inner joint is connected to one end of the cable conduit and located outside the first connector. A first conical surface is formed on the outer circumferential surface of the inner joint, and a sealing ring groove is formed on the first conical surface. The sealing ring is disposed in the sealing ring groove and partially extends out of the sealing ring groove. The union nut is disposed outside the inner joint for threaded connection with a sensor. The transmission cable is equipped with the union nut, which allows for connection and fixation between the transmission cable and the sensor via the threaded connection between the union nut and the sensor during docking. This connection and fixation method using the union nut makes assembly and disassembly more convenient, reduces assembly and disassembly time, and meets the needs of rapid equipment maintenance. Furthermore, the sealing ring groove is disposed on the first conical surface. After the transmission cable is connected to the sensor, the conical surface on the sensor can cooperate with the first conical surface to form a tighter contact structure. The inclined surface extrusion causes the sealing ring to generate greater contact pressure, effectively filling the gap between the contact surfaces, ensuring the pre-compression of the sealing ring, guaranteeing sealing performance, and improving the life of the sealing ring. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A three-dimensional structural diagram of a transmission cable provided in one embodiment;

[0029] Figure 2 A partial cross-sectional structural diagram of a transmission cable provided in one embodiment;

[0030] Figure 3A schematic diagram of the end face structure of a transmission cable provided in one embodiment;

[0031] Figure 4 for Figure 2 A magnified view of region I shown;

[0032] Figure 5 A three-dimensional structural schematic diagram of a sensor provided in one embodiment;

[0033] Figure 6 A partial cross-sectional structural diagram of a sensor provided in one embodiment;

[0034] Figure 7 A schematic diagram of the end face structure of a sensor provided in one embodiment;

[0035] Figure 8 A three-dimensional structural diagram of the sensor connected to the transmission cable according to one embodiment;

[0036] Figure 9 This is a partial cross-sectional structural diagram of a sensor connected to a transmission cable according to one embodiment.

[0037] Figure 10 for Figure 9 A magnified view of a portion of region II shown;

[0038] Explanation of reference numerals in the attached figures:

[0039] Transmission cable 100, cable 10, cable conduit 20, first annular groove 21, second annular protrusion 22, first connector 30, socket 31, inner connector 40, first conical surface 41, sealing ring groove 42, clamping part 43, outer clamping unit 431, first annular protrusion 4311, inner clamping unit 432, second annular groove 4321, connecting part 44, boss 441, mating part 45, extension part 46, positioning structure 461, sealing ring 50, union nut 60, extension wall 61, first thread 62, elastic element 70, limiting element 80, limiting pin 81;

[0040] Sensor 200, connector 210, second conical surface 2101, second thread 2102, protrusion 2103, second connector 220, positioning mark 230. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] It should be noted that when a component is referred to as being "fixed to", "mounted to", or "set on" another component, it can be directly on or indirectly set on the other component; when a component is "connected" to another component, or a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0043] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0045] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0046] This utility model provides a transmission cable, comprising a cable, a cable conduit, a first connector, an inner joint, a sealing ring, and a union nut. The cable conduit surrounds the cable. The first connector is connected to one end of the cable. The inner joint is connected to one end of the cable conduit and located outside the first connector. A first conical surface is formed on the outer circumferential surface of the inner joint, and a sealing ring groove is formed on the first conical surface. The sealing ring is disposed in the sealing ring groove and partially extends out of the sealing ring groove. The union nut is disposed outside the inner joint for threaded connection with a sensor. The transmission cable is equipped with the union nut, which allows for connection and fixation between the transmission cable and the sensor via the threaded connection between the union nut and the sensor during docking. This connection and fixation method using the union nut makes assembly and disassembly more convenient, reduces assembly and disassembly time, and meets the needs of rapid equipment maintenance. Furthermore, the sealing ring groove is disposed on the first conical surface. After the transmission cable is connected to the sensor, the conical surface on the sensor can cooperate with the first conical surface to form a tighter contact structure. The inclined surface extrusion causes the sealing ring to generate greater contact pressure, effectively filling the gap between the contact surfaces, ensuring the pre-compression of the sealing ring, guaranteeing sealing performance, and improving the life of the sealing ring.

[0047] Please refer to the following: Figures 1 to 4 In one embodiment, a transmission cable 100 is provided, specifically for connecting to a sensor, and is a sensor transmission cable. More specifically, in one embodiment, the transmission cable 100 is used in the metallurgical industry and is a transmission cable suitable for high-temperature and high-vibration environments, especially for signal transmission between molten steel level sensors and external equipment.

[0048] The transmission cable 100 includes a cable 10, a cable conduit 20, a first connector 30, an inner connector 40, a sealing ring 50, and a union nut 60. The cable conduit 20 surrounds the cable 10, providing good protection for it. The first connector 30 is connected to one end of the cable 10 and is mainly used to mate with a connector on a sensor, establishing a connection between the sensor and the cable 10, thereby enabling the transmission of sensor signals. The inner connector 40 is connected to one end of the cable conduit 20 and is located outside the first connector 30. The outer peripheral surface of the inner connector 40 has a first conical surface 41, on which a sealing ring groove 42 is formed. The sealing ring 50 is disposed in the sealing ring groove 42, and a portion of the sealing ring 50 extends out of the sealing ring groove 42. In other words, the thickness of the sealing ring 50 needs to be greater than the recess depth of the sealing ring groove 42, so that after the sealing ring 50 is installed in the sealing ring groove 42, a portion of the sealing ring 50 is exposed, allowing it to be compressed by the corresponding surface on the sensor. The live connector nut 60 is disposed outside the inner connector 40 for threaded connection with the sensor. In this embodiment, "outer" refers to the circumferential periphery of a component, for example, such as... Figure 2 As shown, the fact that the union nut 60 is located outside the inner connector 40 means that the union nut 60 is at least partially located on the circumferential periphery of the inner connector 40, and the inner connector 40 is located inside the union nut 60.

[0049] The swivel nut 60, also known as a swivel, is a threaded connector. The swivel makes the connection simpler and the disassembly and replacement easier, greatly saving the connection cost.

[0050] Understandably, in existing technologies, transmission cables and sensors are fixed with bolts, requiring multiple bolts to connect the cable connector to the sensor. This process is complex, requires specialized tools, and is cumbersome and time-consuming, making it difficult to meet the needs of rapid equipment maintenance in metallurgical environments. Furthermore, bolts are prone to corrosion in high-temperature environments, further increasing the difficulty of disassembly and assembly. Traditional structures require layer-by-layer disassembly, making it impossible to quickly separate the transmission cable and sensor, thus extending maintenance time. Simultaneously, the sealing structure design between the transmission cable and sensor in existing technologies is unreasonable. It typically involves directly pressing a flat surface against the sealing ring. Due to various error factors, the preload is difficult to control, and after long-term use, the material is prone to deformation or aging, resulting in loss of sealing performance and leakage. This allows liquid or dust to enter, affecting signal transmission stability and equipment lifespan. Because of these problems with existing technologies, transmission cables perform poorly in high-temperature and high-vibration environments, failing to meet the metallurgical industry's requirements for efficient, reliable, and low-cost maintenance.

[0051] The transmission cable 100 provided in this embodiment achieves rapid assembly and disassembly and high sealing performance through optimized connection methods and sealing structures, thereby significantly improving equipment performance and service life. Specifically, in this embodiment, the sealing ring groove 42 is set on the first conical surface 41. When the transmission cable 100 is connected to the sensor, the conical surface on the sensor cooperates with the first conical surface 41, and the sealing ring 50 is pressed tightly by the inclined surface extrusion, so that the sealing ring 50 generates greater contact pressure, effectively filling the gap of the contact surface, ensuring the pre-compression of the sealing ring 50, ensuring sealing performance, and improving the life of the sealing ring. Furthermore, the use of the live nut 60 for threaded connection with the sensor makes assembly and disassembly more convenient, enabling rapid disassembly and reducing assembly and disassembly time, which can meet the needs of rapid equipment maintenance. The transmission cable 100 can meet the needs of the metallurgical industry for efficient, reliable, and low-cost maintenance.

[0052] In addition, in existing technologies, the cable and connector are an integral structure, making it difficult to achieve modular replacement. Local damage requires replacing the entire transmission cable, which is costly and wasteful of resources.

[0053] The transmission cable 100 provided in this embodiment adopts a modular design, which can realize modular maintenance. Damaged parts can be replaced as needed, reducing maintenance costs and further reducing maintenance time.

[0054] Specifically, in one embodiment, the cable conduit 20 is a high-pressure hose.

[0055] Preferably, in one embodiment, the tail end of the swivel nut 60 is connected to an elastic element 70. In this application, "head end" and "tail end" refer to two opposite end regions of a component. After the transmission cable 100 is connected to the sensor, the head end is the end of the component relatively closer to the sensor, and the tail end is the end of the component relatively farther from the sensor. The elastic element 70 is a component that can undergo elastic deformation under force and return to its initial state after the force is reduced or eliminated. After the transmission cable 100 is connected to the sensor, because the tail end of the swivel nut 60 is provided with the elastic element 70, the elastic element 70 can continuously apply force to the swivel nut 60, preventing the swivel nut 60 from retracting and thus preventing loosening, improving the connection reliability between the transmission cable 100 and the sensor. Furthermore, when installing the transmission cable 100 and the sensor, the swivel nut 60 can also retract to a certain extent after being subjected to force, making it easier for the sensor to be inserted into the transmission cable 100 and reducing installation difficulty.

[0056] Specifically, in one embodiment, the elastic element 70 is a spring.

[0057] Preferably, in one embodiment, the transmission cable 100 further includes a limiting member 80, and the elastic member 70 is connected between the limiting member 80 and the union nut 60. The limiting member 80 is provided with a limiting pin 81, which is used to limit the position of the limiting member 80. The limiting pin 81 is mainly used to fasten the limiting member 80 to other components, thereby limiting the position of the limiting member 80, and consequently limiting the position of one end of the elastic member 70, ensuring that the elastic member 70 can continuously apply force to the union nut 60, preventing the union nut 60 from loosening. The specific component to which the limiting pin 81 is connected can be selected according to actual needs, as long as it can effectively fix the position of the limiting member 80. For example, the limiting pin 81 can be connected to the frame of any equipment to fix the position of the limiting member 80.

[0058] Specifically, in one embodiment, the limiting pin 81 is a pin.

[0059] Specifically, in one embodiment, the limiting member 80 is a hollow sleeve structure and is sleeved on the outside of the cable pipe 20.

[0060] Preferably, in one embodiment, the inner connector 40 is clamped to one end of the cable conduit 20. That is, in this embodiment, the inner connector 40 is specifically connected to the cable conduit 20 by clamping, thereby improving the stability of the connection.

[0061] Preferably, in one embodiment, the first conical surface 41 is formed at the front end of the outer peripheral surface of the inner connector 40, so that when the sensor is installed, the corresponding structure on the sensor can be directly inserted into the outer peripheral surface of the inner connector 40 to realize the installation and docking of the sensor and the transmission cable 100 in a plug-in manner, further reducing the difficulty of disassembly and assembly.

[0062] Preferably, in one embodiment, the inner connector 40 includes a clamping part 43, a connecting part 44, and a mating part 45 arranged sequentially. The clamping part 43 is clamped and connected to one end of the cable conduit 20. A boss 441 protrudes outward from the outer peripheral surface of the connecting part 44, and an extension wall 61 extends inward from the tail end of the swivel nut 60. The boss 441 blocks the extension wall 61, thereby restricting the position of the swivel nut 60 and further reducing the difficulty of assembly and disassembly. For example, as... Figure 2 As shown, the elastic element 70 can apply a rightward force to the union nut 60, while the boss 441 can correspondingly block the union nut 60, restricting its position. Additionally, the abutment between the boss 441 and the extension wall 61 also provides a certain sealing effect, improving sealing performance. The first tapered surface 41 is formed on the outer peripheral surface of the mating portion 45.

[0063] Specifically, in one embodiment, the clamping part 43 includes an outer clamping unit 431 and an inner clamping unit 432. The outer clamping unit 431 has a first annular protrusion 4311 inside, and the outer peripheral surface of the cable tube 20 has a first annular groove 21 corresponding to the first annular protrusion 4311. The first annular protrusion 4311 is inserted into the first annular groove 21. More specifically, in one embodiment, two first annular protrusions 4311 and two corresponding first annular grooves 21 are provided along the axial direction. The two first annular protrusions 4311 are inserted into the two first annular grooves 21, thereby further improving the reliability of the connection. The outer peripheral surface of the inner clamping unit 432 has a second annular groove 4321, and the inner peripheral surface of the cable tube 20 has a second annular protrusion 22 corresponding to the second annular groove 4321. The second annular protrusion 22 is inserted into the second annular groove 4321. More specifically, in one embodiment, along the axial direction, there are two second annular grooves 4321 and two corresponding second annular protrusions 22. The two second annular protrusions 22 are respectively engaged with the two second annular grooves 4321, thereby further improving the reliability of the connection.

[0064] Preferably, in one embodiment, the front end of the docking portion 45 is further provided with an extension portion 46, the extension portion 46 having a ring-shaped structure, and a positioning structure 461 is provided on the extension portion 46. The positioning structure 461 is mainly used for circumferential positioning during installation, further reducing the difficulty of sensor installation and reducing installation time. At the same time, circumferential positioning through the positioning structure 461 can also prevent the pins on the sensor from being inserted into the wrong holes, avoiding erroneous operation. In addition, when the transmission cable 100 is inserted into the sensor, the extension portion 46 can also play a certain guiding role, guiding the corresponding structure on the sensor into the space between the docking portion 45 and the union nut 60, further reducing the difficulty of installation and reducing installation time.

[0065] Specifically, in one embodiment, the positioning structure 461 is a notch formed on the extension 46. Correspondingly, the sensor has a protrusion that matches the notch, and the circumferential positioning between the transmission cable 100 and the sensor is achieved through the cooperation between the protrusion and the notch.

[0066] Preferably, in one embodiment, the cable 10 is a multi-core cable, and the first connector 30 is a socket core with multiple sockets 31. Correspondingly, the sensor is provided with a pin core. When the transmission cable 100 is connected to the sensor, the pins on the sensor's pin core are inserted into the corresponding sockets 31, so that the pins and sockets 31 correspond one-to-one, thereby realizing the connection between the sensor and the cable 10.

[0067] Please refer to the following: Figures 1 to 10 In one embodiment, a connection structure between a sensor and a transmission cable is also provided, comprising a sensor 200 and the transmission cable 100. One end of the sensor 200 is provided with a connector 210 and a second connector 220. The connector 210 is located outside the second connector 220 and is inserted between the inner connector 40 and the union nut 60, and is threadedly connected to the union nut 60. The inner circumferential surface of the connector 210 has a second conical surface 2101 that matches the first conical surface 41. The second conical surface 2101 cooperates with the first conical surface 41 to press the sealing ring 50 tightly. The cooperation between the second conical surface 2101 and the first conical surface 41 forms a tighter contact structure. The inclined surface compression generates greater contact pressure on the sealing ring 50, effectively filling the gaps in the contact surfaces, ensuring the pre-compression of the sealing ring 50, guaranteeing sealing performance, and improving the lifespan of the sealing ring. The second connector 220 is connected to the first connector 30.

[0068] Specifically, in one embodiment, the outer periphery of the connecting joint 210 is provided with a second thread 2102, which matches the first thread 62 on the inner periphery of the swivel nut 60. The threaded connection between the connecting joint 210 and the swivel nut 60 is achieved through the cooperation between the second thread 2102 and the first thread 62.

[0069] Specifically, in one embodiment, the first tapered surface 41 is an outwardly expanding tapered surface from the end of the transmission cable 100 inwardly; the second tapered surface 2101 is an inwardly contracting tapered surface from the end of the sensor 200 inwardly, thereby further reducing the difficulty of mating the sensor 200 with the transmission cable 100. Figure 10 As shown, the first conical surface 41 is a gradually expanding conical structure from the direction close to the sensor 200 to the direction away from the sensor 200 (from left to right), and the second conical surface 2101 is a gradually contracting conical structure from the direction close to the transmission cable 100 to the direction away from the transmission cable 100 (from right to left).

[0070] Specifically, in one embodiment, the connecting joint 210 is provided with a protrusion 2103 that matches the positioning structure 461.

[0071] Specifically, in one embodiment, a positioning mark 230 is provided on the outer peripheral surface of the sensor 200 corresponding to the positioning structure 461. The positioning mark 230 further reduces the difficulty of inserting the sensor 200 into the transmission cable 100. When installing the transmission cable 100 and the sensor 200, the operator can directly circumferentially align the positioning mark 230 with the positioning structure 461 visually, and then directly insert the end of the sensor 200 into the transmission cable 100. Specifically, in one embodiment, the positioning mark 230 is a recessed hole formed on the outer peripheral surface of the sensor 200.

[0072] Specifically, in one embodiment, the sensor 200 is a liquid level sensor. More specifically, in one embodiment, the sensor 200 is a liquid level sensor used in the metallurgical industry to detect molten steel in a smelting furnace.

[0073] Specifically, in one embodiment, the second connector 220 is a pin core with multiple pins.

[0074] The connection structure between the sensor and the transmission cable ensures that the multi-core pins correspond one-to-one with the sockets, avoiding misoperation. Furthermore, the sensor 200 is connected via the live connector nut 60, the sealing ring 50, and the inner connector 40, which is compatible with sealing and quick installation and disassembly, thereby improving metallurgical production efficiency and equipment reliability.

[0075] In addition, existing technologies rely on a single sealing ring and do not consider the differences in thermal expansion under high-temperature environments, resulting in insufficient sealing reliability.

[0076] The connection structure between the sensor and the transmission cable provided in this embodiment not only has a sealing function of the sealing ring 50, but also has a sealing function between the live joint nut 60 and the connecting joint 210, and between the connecting joint 210 and the inner joint 40, achieving multi-level sealing and better sealing effect.

[0077] The above description is merely an embodiment of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. A transmission cable, characterized in that, Includes cable, cable conduit, first connector, inner joint, sealing ring, and union nut; The cable conduit surrounds the outside of the cable; The first connector is connected to one end of the cable; The inner connector is connected to one end of the cable conduit and is located outside the first connector; the outer peripheral surface of the inner connector is provided with a first conical surface, and a sealing ring groove is provided on the first conical surface; The sealing ring is disposed in the sealing ring groove and extends partially out of the sealing ring groove; The live nut is located outside the inner connector for threaded connection with the sensor.

2. The transmission cable according to claim 1, characterized in that, The tail end of the live connector nut is connected to an elastic element.

3. The transmission cable according to claim 2, characterized in that, It also includes a limiting member, the elastic member being connected between the limiting member and the live joint nut, and the limiting member being provided with a limiting pin, the limiting pin being used to limit the position of the limiting member.

4. The transmission cable according to claim 1, characterized in that, The inner connector is clamped to one end of the cable conduit.

5. The transmission cable according to claim 4, characterized in that, The first tapered surface is formed at the front end of the outer peripheral surface of the inner connector.

6. The transmission cable according to claim 5, characterized in that, The internal connector includes a clamping part, a connecting part, and a mating part arranged in sequence. The clamping part is clamped and connected to one end of the cable pipe; The outer peripheral surface of the connecting part is provided with a boss protruding outward, and the tail end of the live joint nut is provided with an extension wall extending inward, and the boss is used to block the extension wall. The first conical surface is formed on the outer peripheral surface of the docking portion.

7. The transmission cable according to claim 6, characterized in that, The front end of the docking part is also provided with an extension part, which is a ring structure and has a positioning structure.

8. The transmission cable according to claim 1, characterized in that, The cable is a multi-core cable, and the first connector is a core with multiple sockets.

9. A connection structure between a sensor and a transmission cable, characterized in that, Includes a sensor and a transmission cable as described in any one of claims 1 to 8; One end of the sensor is provided with a connector and a second connector, the connector being located outside the second connector; The connecting joint is inserted between the inner joint and the live joint nut, and is threadedly connected to the live joint nut; the inner circumferential surface of the connecting joint is provided with a second conical surface that matches the first conical surface, and the second conical surface cooperates with the first conical surface to press the sealing ring tightly; The second connector is connected to the first connector.

10. The connection structure between the sensor and the transmission cable according to claim 9, characterized in that, The sensor is a liquid level sensor.

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