Floating-free pressure measuring device

Abstract

The invention discloses a drift-free pressure measuring device, which is characterized in that a U-shaped coating piece coats the outer part of a main insulator, the middle section of the main insulator is embedded into the U-shaped end of the U-shaped coating piece, and sheet clamps are arranged at the two vertical ends of the U-shaped coating piece; one end of the pull rod is fixed in the middle of the sheet clamp, the pull rod penetrates through the sealing and fixing assembly and the pull plate, and the other end of the pull rod is fixed to the pull plate; the pressure sensor is arranged between the first sealing fixing plate and the pulling plate; if the main insulator radially expands, the U-shaped end receives the radial expansion force of the main insulator to generate deformation, and first tension in the first direction is generated on the two vertical ends through deformation, so that the pull rod is subjected to second tension in the second direction, the second tension is transmitted to the pull plate from the pull rod, and the pull plate receives the second tension to extrude the pressure sensor; the pressure sensor detects a pressure change. The pressure change of the cable insulation interface can be monitored in real time, the pressure sensor is protected, and the accuracy of the pressure detection result is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power cables, and in particular to a drift-free pressure measuring device. Background Art

[0002] In modern power systems, cable performance and reliability are crucial. The stability of the cable insulation interface, the core barrier that ensures safe power transmission, is paramount. However, in various scenarios, the insulation interface is constantly subjected to pressure from the external environment. The stability of the interface pressure directly determines the tightness of the insulation layer. Abnormal pressure can reduce energy transmission efficiency and even cause major safety incidents such as short circuits and fires. Therefore, real-time monitoring of cable insulation interface pressure is particularly important.

[0003] However, in actual detection applications, pressure sensors are exposed to complex and changeable environmental conditions for a long time, such as drastic fluctuations in ambient temperature and changes in humidity, which often cause drift and deviation in detection data, seriously restricting the accuracy and reliability of interface pressure monitoring results, and posing hidden dangers to the safe operation and maintenance of power systems. Summary of the Invention

[0004] The embodiment of the present application provides a drift-free pressure measuring device that can monitor the changes in cable insulation interface pressure under different environments in real time, protect the pressure sensor, and improve the accuracy of pressure detection results.

[0005] In a first aspect, an embodiment of the present application provides a drift-free pressure measurement device, the device comprising a main insulator of a cable, a U-shaped covering, a sheet-shaped clamp, a pull rod, a pull plate, a pressure sensor, and a sealing and fixing assembly;

[0006] The U-shaped covering piece covers the outside of the main insulator, the middle section of the main insulator is embedded in the U-shaped end of the U-shaped covering piece, and sheet-shaped clamps are provided at both vertical ends of the U-shaped covering piece;

[0007] One end of the pull rod is fixed at the middle position of the sheet-shaped clamp, the pull rod passes through the sealing fixing assembly and the pull plate, and the other end of the pull rod is fixed to the pull plate;

[0008] The pressure sensor is arranged between the first sealing fixing plate and the pulling plate. The first sealing fixing plate is the end structural component of the sealing fixing assembly close to the pulling plate.

[0009] If the main insulator is radially expanded, the U-shaped end accepts the radial expansion force of the main insulator to deform, and through the deformation, a first pulling force in a first direction is generated to the vertical two ends, the first direction is the opening direction of the U-shaped cover, the first direction and the second direction are opposite, the second pulling force is transmitted from the pull rod to the pull plate, the pull plate receives the second pulling force to press the pressure sensor, so that the pressure sensor detects the insulation interface pressure of the cable.

[0010] The pressure sensor is arranged on the outer surface of the first part of the pull rod, and the first part is the part of the pull rod passing through the first sealing fixed plate to the pull plate.

[0011] The first support rod is arranged between the first sealing fixed plate and the pull plate, the first screw hole is arranged at the middle position of the first sealing fixed plate, the first through hole is arranged at the middle position of the pull plate, the projection position of the first screw hole in the vertical direction is the same as the projection position of the first through hole in the vertical direction, one end of the first support rod is provided with a first screw thread and a first fastening nut, the first support rod passes through the first screw hole, and the first support rod is fixed on the first sealing fixed plate through cooperation of the first screw thread and the first fastening nut, and the other end of the support rod is embedded in the first through hole.

[0012] The pressure sensor is an elastic member, and the elastic member is arranged on the outer surface of the first support rod.

[0013] The second screw thread is arranged at a predetermined position of the pull rod close to the pull plate, and the second fastening nut is arranged on the side of the pull plate away from the first sealing fixed plate, and the second screw thread and the second fastening nut are matched to adjust the length of the pull rod after passing through the pull plate.

[0014] The main insulator is provided with a support assembly, and the support assembly and the sealing fixed assembly are fixedly connected.

[0015] The support assembly includes a fastening buckle and a second support rod.

[0016] The exposed two ends of the main insulator which are not covered by the U-shaped cover are respectively provided with the fastening buckles, one end of the fastening buckle is fixedly connected with one end of the second support rod, the other end of the second support rod is fixedly connected with a support plate, and the support plate is a first end structure member of the sealing fixed assembly close to the sheet-shaped clamp.

[0017] The sealing and fixing assembly further comprises a second sealing and fixing plate, which is located between the first sealing and fixing plate and the support plate, and the first sealing and fixing plate and the second sealing and fixing plate are used for clamping and fixing objects.

[0018] The support plate is provided with a second screw hole, and the second sealing and fixing plate is provided with a third screw hole, and the projection position of the second screw hole in the vertical direction is the same as the projection position of the third screw hole in the vertical direction.

[0019] The sealing and fixing assembly further comprises a screw rod, one end of the screw rod passes through the support plate through the second screw hole, and the other end of the screw rod passes through the second sealing and fixing plate through the third screw hole.

[0020] The two ends of the support plate are provided with a third fastening nut and a fourth fastening nut, and the one end of the screw rod is fixed on the support plate through the third fastening nut and the fourth fastening nut; the two ends of the second sealing and fixing plate are provided with a fifth fastening nut and a sixth fastening nut, and the other end of the screw rod is fixed on the second sealing and fixing plate through the fifth fastening nut and the sixth fastening nut.

[0021] The shape of the first sealing and fixing plate is the same as that of the support plate, and the shape of the support plate is the same as that of the second sealing and fixing plate.

[0022] It can be seen that the embodiment of the present application has the following beneficial effects:

[0023] The embodiment of the present application comprises a main insulation body of a cable, a U-shaped covering member, a sheet-shaped clamp, a pull rod, a pull plate, a pressure sensor and a sealing and fixing assembly; the U-shaped covering member is wrapped outside the main insulation body, the middle section of the main insulation body is embedded in the U-shaped end of the U-shaped covering member, and sheet-shaped clamps are arranged at the vertical two ends of the U-shaped covering member; one end of the pull rod is fixed at the middle position of the sheet-shaped clamp, the pull rod passes through the sealing and fixing assembly and the pull plate, and the other end of the pull rod is fixed to the pull plate; the pressure sensor is arranged between a first sealing and fixing plate and the pull plate, and the first sealing and fixing plate is an end structural member of the sealing and fixing assembly close to the pull plate; when the main insulation body expands radially, the U-shaped end is deformed by accepting the radial expansion force of the main insulation body, a first pulling force in a first direction is generated on the vertical two ends through the deformation, so that the pull rod is subjected to a second pulling force in a second direction, the first direction is the opening direction of the U-shaped covering member, the first direction and the second direction are opposite, the second pulling force is transmitted from the pull rod to the pull plate, the pull plate receives the second pulling force to press the pressure sensor, and the pressure sensor detects the insulation interface pressure of the cable.

[0024] In this application, when simulating cable aging and causing the main insulator to expand radially, the U-shaped covering is stretched according to the expansion of the main insulator. When the U-shaped covering is in a stretched state, it will generate a pulling force opposite to the stretching direction. The pulling force is transmitted to the pull rod through the sheet clamp. The pull rod pushes the pull plate to squeeze the pressure sensor, and the radial expansion of the main insulator is converted into a detection signal of the pressure sensor. It can realize the simulation of the cable in different environments and monitor the interface pressure of the cable in real time. At the same time, the main insulator and the pressure sensor are isolated by a sealing and fixing component to avoid the influence of external environment such as temperature and humidity on the pressure sensor, thereby ensuring the accuracy and reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 An overall diagram of a drift-free pressure measuring device provided in an embodiment of the present application;

[0027] Figure 2 This is a cross-sectional view of a drift-free pressure measuring device provided in an embodiment of the present application.

[0028] Figure numerals: 100, drift-free pressure measuring device; 10, main insulator; 20, U-shaped covering; 30, sheet clamp; 40, pull rod; 50, pull plate; 501, second fastening nut; 60, pressure sensor; 70, sealing fixing assembly; 701, first sealing fixing plate; 702, second sealing fixing plate; 703, support plate; 704, screw; 705, third fastening nut; 706, fourth fastening nut; 707, fifth fastening nut; 708, sixth fastening nut; 80, support assembly; 801, fastening buckle; 802, second support rod. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of this application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship described in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified or limited.

[0032] In the present application, unless otherwise explicitly specified or limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be connected, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship 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.

[0033] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0034] In modern power systems, the performance and reliability of cables are of great importance, and the stability of the cable insulation interface, as the core barrier to ensure the safe transmission of electric energy, is of the utmost importance. However, in different scenarios, the insulation interface is always subjected to pressure from the external environment. The stability of the interface pressure directly determines the tightness of the insulation layer. If the pressure is abnormal, it can easily cause a decrease in energy transmission efficiency or even cause short circuits, fires, and other major safety accidents. Therefore, real-time monitoring of the pressure of the cable insulation interface is particularly important.

[0035] However, in actual detection applications, the pressure sensor is often subjected to complex and variable environmental conditions, such as drastic fluctuations in environmental temperature and changes in humidity, which often cause the detection data to drift and deviate, seriously affecting the accuracy and reliability of the interface pressure monitoring results and posing a hidden danger to the safe operation of the power system.

[0036] In addition, current cable accessories, especially cable terminal joints and intermediate joints, often become the focus of non-human failures in cable systems, mainly due to the composite interface formed between the main insulation of the cable body and the main insulation of the accessory, which is easily affected by the external environment.

[0037] In order to ensure the performance stability of the composite insulation interface of the cable under different environments, real-time monitoring of the interface pressure is particularly important. However, there is currently a lack of a device that can accurately simulate and measure the changes in the pressure of the composite insulation interface of the cable in a sealed climate chamber. In actual applications, the sensor is easily affected by temperature and humidity, which affects the accuracy and reliability of the test results.

[0038] To solve the above problems, the embodiments of the present application provide a non-drifting pressure measuring device. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0039] Please refer to Figure 1 , Figure 1 The overall diagram of the non-drifting pressure measuring device provided by the embodiments of the present application is shown in Figure 1 The embodiments of the present application provide a non-drifting pressure measuring device 100, which includes a main insulation body 10 of a cable, a U-shaped covering member 20, a sheet-shaped clamp 30, a pull rod 40, a pull plate 50, a pressure sensor 60, and a sealing and fixing assembly 70.

[0040] Among them, in the cable structure, the main insulation body 10 is in a cylindrical shape, which refers to the core insulation material layer that directly wraps the conductor and bears the main electrical isolation function, i.e., the cable main insulation layer exposed after stripping the external cable layer.

[0041] Wherein, for the cable body, the outer protective structure, i.e. the outer sheath, the metal sheath and the insulation shielding layer, need to be stripped in turn, and finally the main insulation body 10 is exposed. This part is usually made of materials with high dielectric properties, such as cross-linked polyethylene, rubber, etc.

[0042] Wherein, for the cable joint, the peripheral components also need to be stripped to fully expose the main insulation body 10.

[0043] Wherein, the U-shaped covering member 20 is wrapped outside the main insulation body 10, and the middle section of the main insulation body 10 is embedded in the U-shaped end of the U-shaped covering member 20. The U-shaped end is a groove structure matching the shape of the main insulation body 10, and the depth and width match the diameter and shape of the main insulation body 10.

[0044] Wherein, the U-shaped end contacts the middle section of the main insulation body 10 to form a composite insulation interface.

[0045] Wherein, the U-shaped covering member 20 can be made of elastic materials, such as silicone rubber, ethylene-propylene rubber, etc.

[0046] Wherein, different diameters and materials of the main insulation body 10 can be replaced according to experiments for research.

[0047] Wherein, a sheet-shaped clamp 30 is provided at the vertical ends of the U-shaped covering member 20, and the sheet-shaped clamp 30 is used to clamp the vertical ends of the U-shaped covering member 20.

[0048] Wherein, one end of the pull rod 40 is fixed at the middle position of the sheet-shaped clamp 30, the pull rod 40 passes through the sealing and fixing assembly 70 and the pull plate 50, and the other end of the pull rod 40 is fixed to the pull plate 50. Wherein, the middle position of each sheet-shaped clamp 30 is fixed with a pull rod 40, and each pull rod 40 passes through each plate in the sealing and fixing assembly 70 and the pull plate 50 in turn through the through holes on the sealing and fixing assembly 70 and the pull plate 50, and is fixed on the pull plate 50 by the tightening nut provided on the pull plate 50.

[0049] Wherein, the sealing and fixing assembly 70 includes a first sealing and fixing plate 701, which is the end structure of the sealing and fixing assembly 70 close to the pull plate 50, and a pressure sensor 60 is arranged between the first sealing and fixing plate 701 and the pull plate 50.

[0050] Wherein, the first sealing and fixing plate 701 and the pull plate 50 are arranged in parallel, and the pressure sensor 60 is tightly clamped in the closed gap formed by the first sealing and fixing plate 701 and the pull plate 50.

[0051] In one possible embodiment, according to the actual structure of the main insulation body 10, a representative sample is selected, for example, a small section containing the complete insulation layer is cut from the cable. The sample surface is cleaned of dirt and impurities, and after ensuring the stable state, it enters the test.

[0052] According to the application scene of the main insulation 10, single stress aging and / or composite stress aging are carried out, for example, the temperature and / or humidity in the sealed climate box are controlled, the aging time is set, and the main insulation 10 is subjected to aging treatment.

[0053] According to the above aging treatment, the radial expansion of the main insulation 10 can be detected, and the radial expansion force is generated by the radial expansion. The radial expansion force of the main insulation 10 first acts on the inner side of the arc-shaped bottom of the U-shaped cover 20, that is, the U-shaped end receives the radial expansion force of the main insulation 10 to generate deformation, so that the U-shaped end bottom is forced to deform outward. Due to the integrity of the structure of the U-shaped cover 20, the outward deformation of the U-shaped end bottom will transmit the force to the vertical ends on both sides through the arc-shaped transition part, and the ends of the vertical ends cannot move outward freely due to the rigid connection with the pull rod 40, so that the U-shaped cover 20 is stretched under the first direction tensile force.

[0054] The first direction is the opening direction of the U-shaped end, which is the same as the direction of the vertical two ends pointing to the pull rod 40.

[0055] After the U-shaped cover 20 is stretched, the first tensile force can be transmitted to the pull rod 40 through the sheet-shaped clamp 30.

[0056] When the U-shaped cover 20 is in the stretched state, due to the elastic reset tendency of itself, a second tensile force in the second direction is applied to the pull rod 40, trying to restore itself to the initial state without stretching by pulling the pull rod 40 to move in the second direction.

[0057] The pull rod 40 receives the second tensile force in the second direction, drives the pull plate 50 to press the pressure sensor 60, and since the position of the first sealing fixed plate 701 is fixed, the pressure of the composite insulation interface of the cable is detected through the pressure sensor 60.

[0058] It can be seen that in the embodiment of the present application, the radial expansion of the main insulation 10 is converted into the detection signal of the pressure sensor 60, which can realize the simulation of the cable in different environments and real-time monitoring of the interface pressure of the cable. At the same time, the main insulation 10 and the pressure sensor 60 are isolated by the sealing and fixing assembly 70, so that when the main insulation 10 is subjected to aging treatment, the influence of the external environment such as temperature and humidity on the pressure sensor 60 is avoided, and the accuracy and reliability of the detection result are ensured.

[0059] In one possible embodiment, please refer to Figure 2 , Figure 2 is a cross-sectional view of a no-drift pressure measuring device provided by the embodiment of the present application, as Figure 2As shown, the pressure sensor 60 is arranged on the outer surface of the first portion of the pull rod 40, which is the portion of the pull rod 40 passing through the first sealing fixed plate 701 to the pull plate 50.

[0060] The pressure sensor 60 can be a spring or an electric pressure sensor.

[0061] Two pressure sensors can be arranged, and each pressure sensor can be arranged on the outer circumferential side of the portion of each pull rod 40 passing through the first sealing fixed plate 701 and connected to the pull plate 50.

[0062] In the embodiment, the pressure sensor 60 is arranged on the outer surface of the pull rod 40, which is the portion of the pull rod 40 passing through the first sealing fixed plate 701 to the pull plate 50.

[0063] In one possible embodiment, a first support rod is arranged between the first sealing fixed plate 701 and the pull plate 50, one end of the first support rod is connected to the middle position of the first sealing fixed plate 701, and the other end of the first support rod is connected to the middle position of the pull plate 50.

[0064] The middle position of the first sealing fixed plate 701 is provided with a first threaded hole, one end of the first support rod is provided with a first thread matched with the first threaded hole, and a first fastening nut matched with the first thread. The first support rod passes through the first threaded hole and is fixed on the first sealing fixed plate 701 by the cooperation of the first thread and the first fastening nut.

[0065] The middle position of the pull plate 50 is provided with a first through hole, so that the other end of the first support rod is embedded in the first through hole. According to the embedded connection structure, the pull plate 50 can move in a certain range along the axial direction of the first support rod. When the pull plate 50 is subjected to tension, the pull plate 50 can slide on the first support rod.

[0066] The projection position of the first threaded hole in the vertical direction is the same as the projection position of the first through hole in the vertical direction.

[0067] In one possible embodiment, the pressure sensor 60 is an elastic member, and the elastic member is arranged on the outer surface of the first support rod. The elastic member is a spring.

[0068] The spring is arranged on the outer surface of the first support rod. When the pull plate 50 is subjected to tension, the pull plate 50 slides on the first support rod, thereby pressing the spring, so that the spring can sense the tension borne by the pull plate 50 in real time.

[0069] In one possible embodiment, a second thread is provided at a preset position in the pull rod 40 near the pull plate 50, and the preset position is related to the second part position of the pull rod 40 passing through the pull plate 50. Two fourth screw holes are provided in the pull plate 50, and the two fourth screw holes are symmetrically arranged, and each fourth screw hole corresponds to a pull rod 40 passing through.

[0070] Among them, Figure 1 and Figure 2 As shown, a second fastening nut 501 is provided on the side of the pull plate 50 away from the first sealing fixing plate 701, and the pull rod 40 passes through the fourth screw hole and cooperates with the second fastening nut 501 through the second thread to fix the end of the pull rod 40 with the second thread on the pull plate 50.

[0071] The second fastening nut 501 can be used to adjust the length of the pull rod 40 after passing through the pull plate 50 , so as to adjust the interface pressure between the U-shaped covering member 20 and the main insulator 10 .

[0072] In a possible embodiment, the deformation of the U-shaped covering member 20 can be changed by adjusting the installation position of the tie rod 40 , wherein the position of the tie rod 40 to be adjusted is determined by the position of the pressure sensor 60 .

[0073] In one possible embodiment, Figure 1 As shown, a support assembly 80 is provided on the main insulator 10 , and the support assembly 80 is fixedly connected to the sealing and fixing assembly 70 , wherein the support assembly 80 is used to provide support force for the main insulator 10 .

[0074] In one possible embodiment, Figure 1 and Figure 2 As shown, the support assembly 80 includes a fastening buckle 801 and a second support rod 802 .

[0075] The fastening clip 801 can be a double-ended fastening clip, used to secure the main insulator 10 and connect the second support rod 802. The fastening clip 801 secures the main insulator 10 through the snap-fit ​​structure at both ends, leveraging its own elasticity and mechanical locking, thereby preventing the main insulator 10 from loosening or falling off, and improving the reliability of the connection.

[0076] The fastening buckle 801 can be replaced according to the diameter of the main insulator 10 .

[0077] The fastening buckles 801 are provided at the exposed ends of the main insulator 10 that are not covered by the U-shaped covering member 20 , and each fastening buckle 801 is fixedly connected to a second support rod 802 .

[0078] Among them, one end of each second support rod 802 is fixedly connected to the fastening buckle 801, and the other end can be fixed to the support plate 703 through a nut, thereby constructing a stable support structure, sharing part of the external force borne by the main insulator 10, enhancing the bearing capacity of the main insulator 10, and ensuring that the main insulator 10 works in a suitable position and state, thereby ensuring that the entire monitoring system can accurately convert the radial expansion of the main insulator 10 into a detection signal of the pressure sensor 60, and realize real-time and accurate monitoring of the insulation interface pressure under different environments.

[0079] The exposed ends of the main insulator 10 not covered by the U-shaped covering member 20 have the same area.

[0080] The support plate 703 is a head end structural component of the sealing and fixing assembly 70 close to the sheet-shaped clamp 30 .

[0081] Among them, the connection method of the above-mentioned fastening buckle 801, the second support rod 802 and the support plate 703 is simple and reliable, which facilitates the installation and disassembly of the entire support assembly 80 and has strong operability when maintaining the equipment or replacing parts.

[0082] Among them, the fastening buckle 801 and the second support rod 802 cooperate with each other, reducing the probability of system failure due to loose or shifted components, and ensuring that the system can operate continuously and stably during the process of simulating different cable environments and monitoring interface pressure.

[0083] In one possible embodiment, Figure 1 As shown, the sealing and fixing assembly 70 further includes a second sealing and fixing plate 702 , which is located between the first sealing and fixing plate 701 and the support plate 703 . The first sealing and fixing plate 701 and the second sealing and fixing plate 702 are used to clamp and fix an object.

[0084] Among them, the fixed object can be a wall, and the first sealing fixed plate 701 is used as the outer baffle of the wall, and the second sealing fixed plate 702 is used as the inner baffle of the wall. The two are placed on both sides of the wall to cooperate to play a fixing role and seal the experimental environment such as constant temperature and humidity. The material can be a sealing elastic insulating medium.

[0085] The support plate 703, the second sealing fixing plate 702, and the first sealing fixing plate 701 form a functional hierarchy from structural support to sealing protection. The support plate 703 provides a basic load for the main insulator 10. The second sealing fixing plate 702 and the first sealing fixing plate 701 cooperate to fix the wall, ensuring the stability of components such as the main insulator 10. They also provide sealing protection for the pressure sensor 60, meeting the stability requirements of the cable during simulations of different environments.

[0086] In a possible embodiment, the support plate 703 is provided with a second screw hole, the second sealing fixing plate 702 is provided with a third screw hole, the projection position of the second screw hole in the vertical direction is the same as the projection position of the third screw hole in the vertical direction, the support plate 703 and the second sealing fixing plate 702 are arranged in parallel, and the second screw hole and the third screw hole are equal in size and arranged in parallel.

[0087] As shown in Figure 1 and Figure 2 The sealing fixing assembly 70 further includes a screw rod 704 for fixing the support plate 703 and the second sealing fixing plate 702.

[0088] Specifically, one side of the support plate 703 close to the sheet-shaped clamp 30 is provided with a third fastening nut 705, one side of the support plate 703 close to the second sealing fixing plate 702 is provided with a fourth fastening nut 706, one end of the screw rod 704 passes through the support plate 703 through the second screw hole, and the screw rod 704 is located at both ends of the support plate 703 and cooperates with the third fastening nut 705 and the fourth fastening nut 706 respectively to fix one end of the screw rod 704 on the support plate 703.

[0089] Specifically, one side of the second sealing fixing plate 702 close to the support plate 703 is provided with a fifth fastening nut 707, one side of the second sealing fixing plate 702 close to the first sealing fixing plate 701 is provided with a sixth fastening nut 708, the other end of the screw rod 704 passes through the second sealing fixing plate 702 through the third screw hole, and the screw rod 704 is located at both ends of the second sealing fixing plate 702 and cooperates with the fifth fastening nut 707 and the sixth fastening nut 708 respectively to fix one end of the screw rod 704 on the support plate 703.

[0090] The distance between the support plate 703 and the second sealing fixing plate 702 can be adjusted through the third fastening nut 705, the fourth fastening nut 706, the fifth fastening nut 707 and the sixth fastening nut 708.

[0091] In a possible embodiment, the shape of the first sealing fixing plate 701 is the same as the shape of the support plate 703, and the shape of the support plate 703 is the same as the shape of the second sealing fixing plate 702.

[0092] The shape of the pull plate 50 is the same as the shape of the first sealing fixing plate 701.

[0093] The shape of the first sealing fixing plate 701 is regular and symmetrical, so that the stress can be more evenly dispersed in force transmission, for example, it can be circular, square, etc.

[0094] The same size can be provided for the pull plate 50, the support plate 703, the second sealing fixing plate 702 and the first sealing fixing plate 701.

[0095] For example, when the pull plate 50 extrudes the pressure sensor 60, the symmetrical structure can make the pressure act vertically and uniformly on the sensor, avoiding local stress concentration leading to detection deviation or component damage.

[0096] Wherein, the same shape and / or size are provided for the pull plate 50, the support plate 703, the second sealing fixed plate 702 and the first sealing fixed plate 701, which can make the force more evenly transmitted between the plates during the force transmission process, avoid local stress concentration caused by shape and / or size difference, reduce the risk of plate deformation and damage caused by stress concentration, ensure the stability and reliability of force transmission, make the process of the pull rod 40 pushing the pull plate 50 to extrude the pressure sensor 60 more stable, and the pressure signal more accurate.

[0097] Wherein, the cable composite insulation interface pressure in the sealed climate box is detected in real time in the embodiment of the application. The device can simulate the pressure change of the cable joint under different environmental conditions, and effectively prevent the sensor from being affected by temperature and humidity. It is suitable for testing the parts such as cable intermediate joint and terminal joint, and provides scientific basis for the design selection of cable accessories and the operation and maintenance of cable lines by accurately measuring the interface pressure parameters, so as to improve the overall reliability and safety of the power system.

[0098] In one possible embodiment, a certain length of cross-linked polyethylene cable is taken, and the outer cable layer is stripped to expose the cable main insulation layer. Wherein, if it is a cable body, the outer sheath, aluminum sheath and insulation shield main insulation are stripped; wherein, if it is a cable joint, the cable accessory is stripped.

[0099] Wherein, the cable main insulation body 10 is fixed to the fastening buckle 801, and the vertical two ends of the U-shaped covering piece 20 are clamped to the sheet-shaped clamp 30. Then the first sealing fixed plate 701 and the second sealing fixed plate 702 are respectively clamped to the inner side and the outer side of the wall.

[0100] Wherein, the length of the outer pull rod 40 is adjusted by the second fastening nut 501 at the pull plate 50 to adjust the initial interface pressure between the U-shaped covering piece 20 and the cable main insulation body 10.

[0101] Finally, the main insulation body 10 is subjected to long-time aging, and the pressure sensor 60 is used for real-time measurement to obtain the pressure change of the composite insulation interface.

[0102] It can be seen that in the embodiment of the application, the different temperature and humidity changes during the operation of the cable can be simulated, and the interface pressure change of the cable accessory during the operation can be monitored in real time.

[0103] In one possible embodiment, a plurality of U-shaped coverings 20 of different lengths can be clamped side by side at the sheet-shaped clamp 30, and by changing the original length of the U-shaped coverings 20, different elongation rates can be obtained after stretching to the same position.

[0104] In the above-described embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0105] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application are set forth by applying specific examples in this paper, the above embodiment explanation is only for helping understanding the method of the application and its core idea; at the same time, for the general technical personnel in the art, according to the idea of the application, the specific implementation mode and application range will have the change, on the whole, the content of the specification should not be understood as the limitation of the application.

Claims

1. A drift-free pressure measuring device, characterized in that: The device includes a main insulator of the cable, a U-shaped covering, a sheet clamp, a pull rod, a pull plate, a pressure sensor and a sealing and fixing assembly; The U-shaped covering piece covers the outside of the main insulator, the middle section of the main insulator is embedded in the U-shaped end of the U-shaped covering piece, and sheet-shaped clamps are provided at both vertical ends of the U-shaped covering piece; One end of the pull rod is fixed at the middle position of the sheet-shaped clamp, the pull rod passes through the sealing fixing assembly and the pull plate, and the other end of the pull rod is fixed to the pull plate; The pressure sensor is arranged between the first sealing fixing plate and the pulling plate. The first sealing fixing plate is the end structural component of the sealing fixing assembly close to the pulling plate. If the main insulator expands radially, the U-shaped end receives the radial expansion force of the main insulator and is deformed, and the deformation generates a first pulling force in a first direction on the vertical two ends, so that the pull rod is subjected to a second pulling force in a second direction. The first direction is the opening direction of the U-shaped covering, and the first direction is opposite to the second direction. The second pulling force is transmitted from the pull rod to the pull plate, and the pull plate receives the second pulling force to squeeze the pressure sensor, so that the pressure sensor detects the insulation interface pressure of the cable.

2. The device according to claim 1, characterized in that The pressure sensor is disposed on an outer surface of a first portion of the pull rod, where the first portion is a portion of the pull rod that passes through the first sealing fixing plate and reaches the pull plate.

3. The device according to claim 1, characterized in that A first support rod is provided between the first sealing fixing plate and the pulling plate, a first screw hole is provided in the middle position of the first sealing fixing plate, and a first through hole is provided in the middle position of the pulling plate, the projection position of the first screw hole in the vertical direction is the same as the projection position of the first through hole in the vertical direction, one end of the first support rod is provided with a first thread and a first fastening nut, the first support rod passes through the first screw hole, and the first thread cooperates with the first fastening nut to fix the first support rod on the first sealing fixing plate, and the other end of the support rod is embedded in the first through hole.

4. The device according to claim 3, characterized in that The pressure sensor is an elastic member, and the elastic member is arranged on the outer surface of the first support rod.

5. The device according to claim 1, characterized in that A second thread is provided in the pull rod at a preset position near the pull plate, and a second fastening nut is provided on the side of the pull plate away from the first sealing fixing plate. The second thread and the second fastening nut cooperate to adjust the length of the pull rod after passing through the pull plate.

6. The device according to claim 1, characterized in that A supporting assembly is provided on the main insulator, and the supporting assembly is fixedly connected to the sealing and fixing assembly.

7. The device according to claim 6, characterized in that The support assembly includes a fastening buckle and a second support rod; The exposed ends of the main insulator that are not covered by the U-shaped covering are respectively provided with the fastening clips, one end of the fastening clip is fixedly connected to one end of the second support rod, and the other end of the second support rod is fixedly connected to the support plate, and the support plate is the head end structural component close to the sheet-like clamp in the sealing and fixing assembly.

8. The device according to claim 7, characterized in that The sealing and fixing assembly further includes a second sealing and fixing plate, which is located between the first sealing and fixing plate and the support plate. The first sealing and fixing plate and the second sealing and fixing plate are used to clamp and fix an object.

9. The device according to claim 8, characterized in that The support plate is provided with a second screw hole, and the second sealing fixing plate is provided with a third screw hole, and the projection position of the second screw hole in the vertical direction is the same as the projection position of the third screw hole in the vertical direction; The sealing and fixing assembly further includes a screw, one end of the screw passes through the support plate through the second screw hole, and the other end of the screw passes through the second sealing and fixing plate through the third screw hole; A third fastening screw and a fourth fastening nut are provided at both ends of the support plate, and one end of the screw is fixed to the support plate through the third fastening nut and the fourth fastening nut; a fifth fastening nut and a sixth fastening nut are provided at both ends of the second sealing fixing plate, and the other end of the screw is fixed to the second sealing fixing plate through the fifth fastening nut and the sixth fastening nut.

10. The device according to claim 8, characterized in that The shape of the first sealing and fixing plate is the same as that of the supporting plate, and the shape of the supporting plate is the same as that of the second sealing and fixing plate.

Images