A device for high and low voltage management

Abstract

The present application discloses a device for high and low voltage management, which relates to the technical field of voltage transformers, including a base, an outlet box and a capacitor voltage divider, the capacitor voltage divider including a ceramic sleeve, a sealing plate fixed on the top of the capacitor voltage divider, and a cap fixed on the top of the sealing plate; a bottom ring and a lifting ring are provided between the sealing plate and the cap, and an expansion joint is fixed between the bottom ring and the lifting ring; a driving tube and a transfer tube are fixed to the lower end face of the lifting ring, a first piston is slidably connected inside the driving tube, a lifting rod is fixedly connected to the bottom of the first piston, and the bottom end of the lifting rod is fixedly connected to the upper end face of the sealing plate; the transfer tube is divided into an upper branch tube, a lower branch tube and an elastic tube; one side of the top end of the driving tube is fixedly connected to one side of the top end of the transfer tube by a connecting tube; a temperature sensing component is fixed to the bottom of the lower branch tube; the technical effect of reducing the influence of the device's own volume on the oil pressure when the device balances the oil pressure during temperature changes, thereby improving the pressure compensation accuracy, is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage transformers, and in particular to a device for high and low voltage management. Background Art

[0002] A voltage transformer (PT) is a special transformer used to convert high voltage into low voltage for measurement, protection and control. There is an oil-immersed voltage transformer, most of which refer to capacitive voltage transformers. Capacitive voltage transformers are mainly composed of a capacitor voltage divider and a medium voltage transformer. The capacitor voltage divider consists of a porcelain sleeve and several series capacitors installed in it. The porcelain sleeve is filled with insulating oil that maintains a positive pressure of 0.1MPa. In order to prevent the voltage transformer from being affected by the thermal expansion and contraction of the insulating oil, a steel bellows is installed on the top of the ceramic sleeve to balance the oil pressure in different environments. However, the expansion oil itself will still expand or contract due to the influence of temperature. The authorization announcement number in the prior art is Chinese patent CN114242377B discloses a thermally stable oil-immersed voltage transformer, comprising a ceramic sleeve, the top of which is fixedly connected to a sealing plate, a through hole being provided between the upper and lower surfaces of the sealing plate, and characterized in that: a cap is fixedly connected to the top surface of the sealing plate, a bottom ring and a lifting ring are provided on the inner side of the cap, an expansion joint is fixedly connected between the bottom ring and the lifting ring, the bottom ring is fixedly connected to the top surface of the sealing plate, the interior of the ceramic sleeve and the expansion joint are filled with insulating oil, the top surface of the sealing plate is fixedly connected to a drive pipe, The transfer tube, the temperature sensing tube, and the right-angle tube are all located on the inner side of the expansion joint. A liquid guide tube is fixedly connected between the drive tube and the transfer tube. The bottom surface of the lifting ring is fixedly connected to a lifting rod. The bottom end of the lifting rod is fixedly connected to a first piston. The lifting rod and the first piston are both located on the inner side of the drive tube and the first piston is slidably connected to the inner wall of the drive tube. A plurality of mounting holes are opened on the side wall of the transfer tube, and elastic tubes are fixedly connected to the interior of the plurality of mounting holes. The top of the transfer tube is fixedly connected to A right-angle tube, a sealing ring is fixedly connected to the inner wall of the right-angle tube, a trigger tube is fixedly connected to the outer wall of the right-angle tube, a valve stem is slidably connected to the inside of the trigger tube, one end of the valve stem extends to the inner side of the right-angle tube, an end of the valve stem away from the trigger tube is fixedly connected to a sealing plate, the sealing plate is located on the side of the sealing ring away from the trigger tube, an end of the valve stem close to the trigger tube is fixedly connected to an elastic sheet, a capillary tube is connected between the trigger tube and the temperature sensing tube, and the interior of the temperature sensing tube and the side of the elastic sheet away from the valve stem are filled with temperature sensing liquid.

[0003] In the above-mentioned device, the first piston slides within the drive tube, forming a cavity with a variable volume. When the temperature rises, the first piston moves upward with the lifting ring, causing the volume of the drive tube cavity to increase, which in turn causes the volume of the insulating oil to further increase, resulting in a subsequent increase in oil pressure. Secondly, the transfer tube is within the insulating oil. When the insulating oil expands, the volume of the transfer tube immersed in the insulating oil gradually increases linearly as the liquid level rises. However, after the transfer tube is completely immersed in the insulating oil, the volume of the transfer tube no longer affects the rising height of the liquid level. As a result, the speed at which the insulating oil level changes due to thermal expansion before and after the transfer tube is completely immersed in the insulating oil changes significantly, making it difficult for the drive tube to accurately compensate for the oil pressure. Therefore, certain improvements are needed. Summary of the Invention

[0004] The embodiments of the present application provide a device for high and low voltage management, thereby solving the technical problem in the prior art that the volume of the drive tube and the transfer tube themselves easily affects the speed of change of the insulating oil liquid level. This achieves the technical effect of reducing the negative impact of the device's own volume on the oil pressure when the device balances the oil pressure during temperature changes, thereby improving the pressure compensation accuracy.

[0005] An embodiment of the present application provides a device for high and low voltage management, including a base, an outlet box and a capacitor voltage divider, the capacitor voltage divider includes a ceramic sleeve, a sealing plate and a cap are fixed on the top of the capacitor voltage divider; a bottom ring and a lifting ring are provided between the sealing plate and the cap, an expansion joint is fixed between the bottom ring and the lifting ring, a driving tube and a transfer tube are fixed on the lower end face of the lifting ring, the driving tube and the transfer tube are both vertically arranged, the driving tube is a cylinder with an open bottom, a first piston is slidably connected to the inside of the driving tube, a lifting rod is fixedly connected to the bottom of the first piston, and the bottom end of the lifting rod is fixedly connected to the upper end face of the sealing plate; the transfer tube is divided into three parts, upper, middle and lower, wherein the upper end is an upper branch tube, and the lower end is a lower branch tube, and the upper branch tube and the lower tube are connected by an elastic tube; a temperature sensing component is fixed to the bottom of the lower tube; one side of the top of the driving tube is fixedly connected to one side of the top of the transfer tube by a connecting tube.

[0006] Preferably, the lifting ring and the bottom ring are slidably connected in the vertical direction through a connecting rod; the lifting ring is frustum-shaped, the bottom ring is annular, and the two are coaxially arranged; a cavity is formed between the lifting ring, the expansion joint and the sealing plate; the bottom ring is fixedly connected to the top surface of the sealing plate, the ceramic sleeve and the interior of the expansion joint are connected, and both are filled with insulating oil.

[0007] Preferably, the elastic tube is cylindrical with upper and lower openings, the top of the upper branch tube is fixedly connected to the lower end surface of the lifting ring, and the bottom of the lower branch tube is fixedly connected to the upper end surface of the sealing plate, and the elastic tube is made of elastic rubber.

[0008] Preferably, the temperature sensing component includes a liquid inlet pipe and a trigger tube, the liquid inlet pipe and the trigger tube are fixedly connected to the left and right sides of the lower branch pipe respectively, the trigger tube is fixedly connected to the temperature sensing tube at one end away from the lower branch pipe, and a plurality of evenly distributed temperature conducting plates are fixedly connected to the side wall of the temperature sensing tube; the interior of the temperature sensing tube is filled with temperature sensing liquid, an elastic sheet is fixed between the trigger tube and the interior of the temperature sensing tube, a valve stem is fixed on the side of the elastic sheet close to the trigger tube, the valve stem vertically passes through the lower branch pipe and penetrates into the liquid inlet pipe, a through hole is opened at the connection between the liquid inlet pipe and the lower branch pipe, a sealing ring is provided in the through hole, a sealing plate is fixed to the end of the valve stem, and the sealing plate cooperates with the sealing ring.

[0009] Preferably, a plurality of pull ropes are provided in the transfer tube; the pull ropes are non-elastic ropes, one end of the pull ropes is connected to the inner wall of the upper branch tube, and the other end of the pull ropes is connected to the inner wall of the lower branch tube, and the plurality of pull ropes are evenly distributed along the axial direction of the transfer tube.

[0010] Preferably, the elastic tube sleeve is arranged to cover the outside of the multiple pull ropes; when the temperature rises and the upper branch tube and the lower branch tube move away from each other, the pull rope is straightened and the drive tube moves upward, thereby forming a negative pressure inside the transfer tube to suck the insulating oil, and the multiple pull ropes simultaneously prevent the elastic tube from deforming inward; when the temperature drops and the upper branch tube and the lower branch tube move closer to each other, the pull rope is loosened and the drive tube moves downward, thereby forming a positive pressure inside the transfer tube, causing the elastic tube to shrink in the length direction and expand in the radial direction.

[0011] Preferably, the length direction of the upper branch pipe is parallel to the length direction of the lower branch pipe, and the length directions of the upper branch pipe and the lower branch pipe are both vertically arranged, and the axes of the two are staggered with each other, so that the elastic tube as a whole is inclined in the length direction; when the upper branch pipe and the lower branch pipe are close to each other, the inclination angle between the length direction of the elastic tube and the length direction of the upper branch pipe increases, thereby accelerating the speed at which the elastic tube as a whole is immersed in the insulating oil.

[0012] Preferably, the inner wall of the upper branch pipe is provided with a plurality of sliding cavities, and the sliding cavities are vertically arranged grooves with openings toward the axis of the upper branch pipe. The plurality of sliding cavities correspond one-to-one to a plurality of pull ropes, and a sliding block is slidably connected in the sliding cavity.

[0013] Preferably, one end of the sliding block away from the sliding cavity protrudes out of the opening of the sliding cavity, and the upper end surface of the sliding block is elastically connected to the top of the sliding cavity through a tension spring.

[0014] Preferably, the portion of the lower end surface of the sliding block protruding outside the opening of the sliding cavity is fixedly connected to the top of the pull rope; when the upper branch pipe and the lower branch pipe move away from each other, and as the pull rope is straightened, the pull rope pulls the sliding block to slide in the sliding cavity, and the sliding block drives the tension spring to stretch.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0016] By fixing the driving tube and the lifting ring, the internal cavity of the driving tube is always kept at the upper end, thereby reducing the influence of the volume change of the driving tube cavity on the insulating oil. The transfer tube is divided into three sections: upper, middle and lower. The elastic tube in the middle section shrinks in the length direction, so that the speed of change of the volume of the entire transfer tube immersed in the insulating oil remains stable, thereby solving the technical problem in the prior art that the volume of the driving tube and the transfer tube themselves easily affects the speed of change of the insulating oil liquid level. When the device balances the oil pressure during temperature changes, the influence of the device's own volume on the oil pressure is reduced, thereby improving the technical effect of pressure compensation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the cap according to embodiment 1 of the present invention;

[0019] Figure 3 for Figure 2 A magnified schematic diagram of area A;

[0020] Figure 4 for Figure 3 A magnified schematic diagram of area B;

[0021] Figure 5 This is a schematic diagram of the elastic tube in a stretched state according to the first embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the elastic tube in the expanded state according to the first embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the pull rope in a straightened state according to the second embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of a relaxed state of the pull rope in embodiment 2 of the present invention;

[0025] Figure 9 This is a schematic diagram of the transfer tube in the tilted state in the third embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram of the internal structure of the upper branch of Example 4 of the present invention.

[0027] In the picture:

[0028] Base 100; outlet box 110; capacitor voltage divider 200; ceramic sleeve 210; sealing plate 300; cover cap 400; expansion joint 500; lifting ring 510; drive tube 600; lifting rod 610; first piston 620; connecting tube 630; transfer tube 700; upper branch tube 710; sliding cavity 711; sliding block 712; tension spring 713; lower branch tube 720; elastic tube 730; pull rope 740; temperature sensing tube 800; liquid inlet tube 810; sealing ring 811; trigger tube 820; elastic sheet 830; valve stem 840; sealing plate 841; temperature sensing liquid 850. DETAILED DESCRIPTION

[0029] To facilitate understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0030] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0032] Example 1: Figures 1 to 6As shown, the present application is a device for high and low voltage management, including a base 100, an outlet box 110 opened on the side of the base 100, and a capacitor voltage divider 200 fixed on the top of the base 100. The capacitor voltage divider 200 includes a coaxially sleeved ceramic sleeve 210. A sealing plate 300 is fixed on the top of the capacitor voltage divider 200, and a cap 400 is fixed on the top of the sealing plate 300; a bottom ring and a lifting ring 510 are provided between the sealing plate 300 and the cap 400, and an expansion joint 500 is fixed between the bottom ring and the lifting ring 510. The bottom ring is fixedly connected to the top surface of the sealing plate 300, the ceramic sleeve 210 and the interior of the expansion joint 500 are connected, and both are filled with insulating oil. The lifting ring 510 and the bottom ring are connected by a connecting rod in a vertical sliding direction; the lifting ring 510 is truncated cone-shaped, and the bottom ring is annular, and the two are coaxially arranged; a cavity is formed between the lifting ring 510, the expansion joint 500 and the sealing plate 300; when the temperature rises, the lifting ring 510 slides upward under the drive of the expansion joint 500, and when the temperature drops When the lifting ring 510 is driven by the expansion joint 500, it slides downward; the lower end surface of the lifting ring 510 is fixed with a driving tube 600 and a transfer tube 700, and the driving tube 600 and the transfer tube 700 are both arranged vertically. The driving tube 600 is a vertical cylinder with an opening at the bottom. The driving tube 600 is slidably connected to the inside of the driving tube 600. The bottom of the first piston 620 is fixedly connected to the lifting rod 610, and the bottom end of the lifting rod 610 is fixedly connected to the upper end surface of the sealing plate 300; the transfer tube 700 is fixed to the upper end surface of the sealing plate 300. It is divided into three parts: upper, middle and lower, wherein the upper end is the upper branch pipe 710, and the lower end is the lower branch pipe 720. The upper branch pipe 710 and the lower branch pipe 720 are connected through an elastic tube 730. The elastic tube 730 is a cylinder with upper and lower openings. The top of the upper branch pipe 710 is fixedly connected to the lower end face of the lifting ring 510, and the bottom of the lower branch pipe 720 is fixedly connected to the upper end face of the sealing plate 300. The elastic tube 730 is made of elastic rubber; the top side of the driving tube 600 is fixedly connected to the top side of the transfer tube 700 through a connecting tube 630.

[0033] A temperature sensing assembly is fixed to the bottom of the lower branch pipe 720. The temperature sensing assembly includes a liquid inlet pipe 810 and a trigger pipe 820. The liquid inlet pipe 810 and the trigger pipe 820 are fixedly connected to the left and right sides of the lower branch pipe 720 respectively. The trigger pipe 820 is fixedly connected to the temperature sensing pipe 800 at one end away from the lower branch pipe 720. A plurality of evenly distributed temperature conducting plates are fixedly connected to the side wall of the temperature sensing pipe 800. The interior of the temperature sensing pipe 800 is filled with temperature sensing liquid 850. An elastic plate 830 is fixed between the trigger pipe 820 and the interior of the temperature sensing pipe 800. A valve stem 840 is fixed to the side of the elastic sheet 830 close to the trigger tube 820. The valve stem 840 vertically penetrates the lower branch pipe 720 and enters the liquid inlet pipe 810. A through hole is opened at the connection between the liquid inlet pipe 810 and the lower branch pipe 720, and a sealing ring 811 is provided in the through hole. A sealing plate 841 is fixed to the end of the valve stem 840. The sealing plate 841 cooperates with the sealing ring 811. When the temperature rises, the elastic sheet 830 drives the sealing plate 841 to separate from the sealing ring 811, thereby making the lower branch pipe 720 and the liquid inlet pipe 810 conductive.

[0034] When the temperature rises, the pressure inside the expansion joint 500 increases, and the expansion joint 500 drives the lifting ring 510 upward. Simultaneously, the lifting ring 510 drives the drive tube 600 upward, causing the first piston 620 to move downward relative to the drive tube 600. Simultaneously, the upper branch pipe 710 moves upward away from the lower branch pipe 720, causing the elastic tube 730 to be vertically stretched. At this time, the temperature sensing component becomes conductive as the temperature rises, and insulating oil enters the interior of the transfer pipe 700 from the temperature sensing component, thereby balancing the pressure of the insulating oil. When the temperature drops, the pressure inside the expansion joint 500 decreases, and the expansion joint 500 drives the lifting ring 510 downward. The lifting ring 510 drives the drive tube 600 downward. Simultaneously, the distance between the upper branch pipe 710 and the lower branch pipe 720 decreases, causing the elastic tube 730 to contract in the longitudinal direction. At this time, the temperature sensing component is in a closed state. As the drive tube 600 moves, the pressure inside the transfer pipe 700 increases, causing the elastic tube 730 to expand radially, thereby raising the liquid level of the insulating oil and compensating for the internal pressure of the insulating oil.

[0035] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0036] In this embodiment, the driving tube 600 is fixed to the lifting ring 510 so that the internal cavity of the driving tube 600 always remains at the upper end, thereby reducing the impact of the volume change of the cavity of the driving tube 600 on the insulating oil. The transfer tube 700 is divided into three sections: upper, middle and lower. The elastic tube 730 in the middle section shrinks in the length direction, so that the volume change rate of the entire transfer tube 700 immersed in the insulating oil remains stable, thereby solving the technical problem in the prior art that the volume of the driving tube 600 and the transfer tube 700 themselves easily affects the change rate of the insulating oil liquid level. When the device balances the oil pressure during temperature changes, the impact of the device's own volume on the oil pressure is reduced, thereby improving the pressure compensation accuracy.

[0037] Embodiment 2: Considering that in the above-mentioned embodiment 1, when the temperature of the transfer tube 700 rises, the upper branch tube 710 and the lower branch tube 720 move away from each other, the elastic tube 730 is stretched in the longitudinal direction, and the upper half of the elastic tube 730 may exceed the insulating oil liquid level. As a result, the lower half of the elastic tube 730 may produce radial contraction deformation as the first piston 620 and the driving tube 600 move relative to each other. However, since only a portion of the elastic tube 730 is in contact with the insulating oil at this time, the contraction deformation of the elastic tube 730 changes nonlinearly with respect to the compensation effect of the insulating oil. Therefore, it is necessary to reduce the influence of the radial contraction deformation of the elastic tube 730 on the insulating oil. Therefore, it is necessary to improve the device, such as Figure 7 and Figure 8 As shown, the specific structure is as follows:

[0038] The transfer tube 700 is provided with a plurality of pull ropes 740; the pull ropes 740 are non-elastic ropes, one end of the pull ropes 740 is connected to the inner wall of the upper branch tube 710, and the other end of the pull ropes 740 is connected to the inner wall of the lower branch tube 720. The plurality of pull ropes 740 are evenly distributed along the axial direction of the transfer tube 700; the elastic tube 730 is sleeved and covered on the outside of the plurality of pull ropes 740; when the temperature rises, the upper branch tube 710 and the lower branch tube 720 move away from each other, and the pull ropes 740 are straightened, driving the tube 60 0 moves upward, thereby forming a negative pressure inside the transfer pipe 700 to suck the insulating oil. During this process, multiple pull ropes 740 simultaneously prevent the elastic tube 730 from deforming inward. When the temperature drops and the upper branch pipe 710 and the lower branch pipe 720 approach each other, the pull ropes 740 are loosened, and the driving pipe 600 moves downward, thereby forming a positive pressure inside the transfer pipe 700, causing the elastic tube 730 to contract in the longitudinal direction and expand in the radial direction. At this time, the pull ropes 740 will not affect the pressure compensation of the insulating oil.

[0039] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0040] In this embodiment, a plurality of pull ropes 740 are provided. The pull ropes 740 are gradually straightened as the upper branch pipe 710 moves away from the lower branch pipe 720, and are gradually loosened as the upper branch pipe 710 approaches the lower branch pipe 720. As a result, the pull ropes 740 prevent the elastic tube 730 from shrinking inward when the temperature rises, thereby reducing the influence on the insulating oil pressure caused by the uncontrollable deformation of the elastic tube 730 when the elastic tube 730 partially exceeds the liquid level in the longitudinal direction.

[0041] Example 3: Considering that in the above-mentioned Example 2, during the downward movement of the upper branch pipe 710, the shortening speed of the elastic tube 730 in the longitudinal direction needs to be synchronized with the movement of the upper branch pipe 710, and the portion of the elastic tube 730 above the insulating oil level needs to wait for the upper branch pipe 710 to move slowly downward so that the elastic tube 730 can be completely immersed in the insulating oil. After the elastic tube 730 is completely immersed in the insulating oil, the expansion of the elastic tube 730 is proportional to the change in the insulating oil pressure, so as to ensure a higher accuracy of the oil pressure compensation. Therefore, it is necessary to improve the device, such as Figure 9 As shown, the specific structure is as follows:

[0042] The length direction of the upper branch pipe 710 is parallel to the length direction of the lower branch pipe 720. The length directions of the upper branch pipe 710 and the lower branch pipe 720 are both vertically arranged, and the axes of the two are staggered with each other, so that the elastic tube 730 is tilted in the length direction as a whole.

[0043] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0044] In this embodiment, the elastic tube 730 is tilted by offsetting the axes of the upper branch tube 710 and the lower branch tube 720. The tilt angle of the elastic tube 730 changes continuously with the movement of the upper branch tube 710. As the upper branch tube 710 and the lower branch tube 720 approach each other, the tilt angle between the length direction of the elastic tube 730 and the length direction of the upper branch tube 710 increases continuously, thereby accelerating the speed at which the elastic tube 730 as a whole is immersed in the insulating oil. Secondly, because the length direction of the elastic tube 730 is stretched as the upper branch tube 710 and the lower branch tube 720 move away from each other, and the elastic tube 730 is straightened along with the pull rope 740, when the temperature decreases, the change in the tilt angle of the elastic tube 730 and the change in its length can both maintain an observable proportional relationship.

[0045] Example 4: Considering that the pull rope 740 in the above-mentioned Example 3 moves in the process of the upper branch tube 710, as the temperature rises, the movement distance of the upper branch tube 710 increases, and the negative pressure inside the transfer tube 700 gradually increases, the straightening state of the pull rope 740 is required to be higher. At the same time, since the pull rope 740 cannot be further stretched after being straightened, in order to ensure a longer service life of the pull rope 740 and prevent the pull rope 740 from being easily broken, it is necessary to improve the device, such as Figure 10 As shown, the specific structure is as follows:

[0046] The inner wall of the upper branch pipe 710 is provided with a plurality of sliding cavities 711, and the sliding cavities 711 are vertically arranged grooves with openings facing the axis of the upper branch pipe 710. The plurality of sliding cavities 711 correspond to a plurality of pull ropes 740 one by one. A sliding block 712 is slidably connected in the sliding cavity 711. One end of the sliding block 712 away from the sliding cavity 711 protrudes outside the opening of the sliding cavity 711. The upper end surface of the sliding block 712 is elastically connected to the top of the sliding cavity 711 by a tension spring 713. The portion of the lower end surface of the sliding block 712 protruding outside the opening of the sliding cavity 711 is connected to the pull rope 740. The top ends are fixedly connected; when the upper branch tube 710 and the lower branch tube 720 move away from each other, and as the pull rope 740 is straightened, the pull rope 740 pulls the sliding block 712 to slide in the sliding cavity 711, and the sliding block 712 drives the tension spring 713 to stretch. The farther the upper branch tube 710 moves upward, the longer the tension spring 713 is stretched, and the tighter the pull rope 740 is stretched, thereby ensuring that the straightening strength of the pull rope 740 gradually increases, and when the pull rope 740 is tilted, it provides an elastic margin for the pull rope 740, reducing the possibility of bending and damage at the end of the pull rope 740.

[0047] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0048] In this embodiment, a sliding cavity 711 is provided and an elastic margin is provided at the top of the pull rope 740, thereby preventing the pull rope 740 from being subjected to excessive hard pulling force during the movement of the upper branch tube 710, and providing a vertical elastic component of force for the oblique pulling force of the pull rope 740, so that the tension of the pull rope 740 gradually increases with the change of the negative pressure inside the transfer tube 700. Therefore, when the negative pressure is large and in the process of increasing negative pressure, the straightness of the pull rope 740 always matches the radial contraction force of the elastic tube 730, thereby preventing the pull rope 740 from being subjected to excessive pulling force.

[0049] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations are readily apparent to those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for high and low voltage management, comprising a base (100), an outlet box (110) and a capacitive voltage divider (200), wherein the capacitive voltage divider (200) comprises a ceramic sleeve (210), and a sealing plate (300) and a cover cap (400) are fixed on the top of the capacitive voltage divider (200); a bottom ring and a lifting ring (510) are provided between the sealing plate (300) and the cover cap (400), and an expansion joint (500) is fixed between the bottom ring and the lifting ring (510), characterized in that: A driving tube (600) and a transfer tube (700) are fixed to the lower end surface of the lifting ring (510). Both the driving tube (600) and the transfer tube (700) are arranged vertically. The driving tube (600) is cylindrical with an open bottom. A first piston (620) is slidably connected inside the driving tube (600). A lifting rod (610) is fixedly connected to the bottom of the first piston (620). The bottom end of the lifting rod (610) is fixedly connected to the upper end surface of the sealing plate (300). The transfer tube (700) is divided into three parts: upper, middle and lower. The upper end is an upper branch tube (710) and the lower end is a lower branch tube (720). The upper branch tube (710) and the lower branch tube (720) are connected through an elastic tube (730). A temperature sensing component is fixed to the bottom of the lower branch tube (720). The top side of the driving tube (600) is fixedly connected to the top side of the transfer tube (700) through a connecting tube (630). The lifting ring (510) and the bottom ring are connected in a sliding manner in the vertical direction via a connecting rod; the lifting ring (510) is truncated, the bottom ring is annular, and the two are coaxially arranged; a cavity is formed between the lifting ring (510), the expansion joint (500), and the sealing plate (300); the bottom ring is fixedly connected to the top surface of the sealing plate (300), the ceramic sleeve (210) and the expansion joint (500) are connected to each other, and both are filled with insulating oil; The temperature sensing component comprises a liquid inlet pipe (810) and a trigger pipe (820), wherein the liquid inlet pipe (810) and the trigger pipe (820) are respectively fixedly connected to the left and right sides of the lower branch pipe (720), and the trigger pipe (820) is fixedly connected to the temperature sensing pipe (800) at one end away from the lower branch pipe (720). A plurality of evenly distributed temperature conducting plates are fixedly connected to the side wall of the temperature sensing pipe (800); the interior of the temperature sensing pipe (800) is filled with a temperature sensing liquid (850), and the trigger pipe (820) is connected to the temperature sensing pipe (800). ) is fixed between the inside of the valve stem (840), and a valve stem (840) is fixed on the side of the elastic sheet (830) close to the trigger tube (820). The valve stem (840) vertically penetrates the lower branch pipe (720) and enters the liquid inlet pipe (810). A through hole is opened at the connection between the liquid inlet pipe (810) and the lower branch pipe (720), and a sealing ring (811) is provided in the through hole. A sealing plate (841) is fixed to the end of the valve stem (840), and the sealing plate (841) cooperates with the sealing ring (811).

2. The device for high and low voltage management according to claim 1, characterized in that: The elastic tube (730) is cylindrical with upper and lower openings. The top of the upper branch tube (710) is fixedly connected to the lower end surface of the lifting ring (510), and the bottom of the lower branch tube (720) is fixedly connected to the upper end surface of the sealing plate (300). The elastic tube (730) is made of elastic rubber.

3. The device for high and low voltage management according to claim 1, characterized in that: A plurality of pull ropes (740) are provided in the transfer tube (700); the pull ropes (740) are non-elastic ropes, one end of the pull rope (740) is connected to the inner wall of the upper branch tube (710), and the other end of the pull rope (740) is connected to the inner wall of the lower branch tube (720), and the plurality of pull ropes (740) are evenly distributed along the axial direction of the transfer tube (700).

4. The device for high and low voltage management according to claim 3, characterized in that: The elastic tube (730) is sleeved and covered on the outside of the plurality of pull ropes (740); when the temperature rises and the upper branch tube (710) and the lower branch tube (720) move away from each other, the pull rope (740) is straightened and the drive tube (600) moves upward, thereby forming a negative pressure inside the transfer tube (700) to suck the insulating oil, and the plurality of pull ropes (740) simultaneously prevent the elastic tube (730) from deforming inward; when the temperature drops and the upper branch tube (710) and the lower branch tube (720) move closer to each other, the pull rope (740) is loosened and the drive tube (600) moves downward, thereby forming a positive pressure inside the transfer tube (700), causing the elastic tube (730) to shrink in the longitudinal direction and expand in the radial direction.

5. The device for high and low voltage management according to claim 3, characterized in that: The length direction of the upper branch pipe (710) and the length direction of the lower branch pipe (720) are parallel to each other. The length directions of the upper branch pipe (710) and the lower branch pipe (720) are both vertically arranged, and the axes of the two are staggered with each other, so that the elastic tube (730) is tilted in the length direction as a whole; when the upper branch pipe (710) and the lower branch pipe (720) are close to each other, the tilt angle between the length direction of the elastic tube (730) and the length direction of the upper branch pipe (710) increases, thereby accelerating the speed at which the elastic tube (730) is immersed in the insulating oil as a whole.

6. The device for high and low voltage management according to claim 5, characterized in that: The inner wall of the upper branch pipe (710) is provided with a plurality of sliding cavities (711), and the sliding cavities (711) are vertically arranged grooves with openings toward the axis of the upper branch pipe (710). The plurality of sliding cavities (711) correspond one-to-one to the plurality of pull ropes (740), and a sliding block (712) is slidably connected in the sliding cavity (711).

7. The device for high and low voltage management according to claim 6, characterized in that: One end of the sliding block (712) away from the sliding cavity (711) protrudes outside the opening of the sliding cavity (711), and the upper end surface of the sliding block (712) is elastically connected to the top of the sliding cavity (711) via a tension spring (713).

8. The device for high and low voltage management according to claim 7, characterized in that: The portion of the lower end surface of the sliding block (712) protruding outside the opening of the sliding cavity (711) is fixedly connected to the top of the pull rope (740); when the upper branch tube (710) and the lower branch tube (720) move away from each other, and as the pull rope (740) is straightened, the pull rope (740) pulls the sliding block (712) to slide in the sliding cavity (711), and the sliding block (712) drives the tension spring (713) to stretch.

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