A capsule type oil reservoir for a linkageless oil level gauge

Abstract

The present application relates to the technical field of oil storage, in particular to a capsule type oil storage tank without connecting rod oil level gauge, which comprises an oil storage tank body and a capsule, and the outer wall of the oil storage tank body is provided with a connecting rod oil level gauge mechanism, which comprises a square tube, the inner cavity of the square tube is provided with a guide positioning assembly, the outer surface of the square tube is further provided with a magnetic flap liquid level gauge, a pull rope is arranged on the upper limit of the guide positioning assembly, the pull rope is kept in a taut state by the elastic force of the guide positioning assembly, the end of the pull rope is sealed and extends into the inside of the oil storage tank body, and the movable part of the capsule is vulcanizedly connected with a reinforcing connecting plate, and the end of the pull rope is connected and fixed with the reinforcing connecting plate. The pull rope can sense the tension or slack force generated by the expansion, contraction and deformation of the capsule, avoid the eccentric load and jamming caused by the extrusion between the linkage block and the guide rail in the bidirectional U-shaped path, realize the accurate transmission without stroke loss and nonlinear deformation, drive the change of the magnetic connection area, reflect the liquid level information, and improve the accuracy of liquid level information detection.

Description

Technical Field

[0001] This invention relates to the field of oil storage technology, and more specifically, to a capsule-type oil storage tank without a linkage level gauge. Background Technology

[0002] Oil-immersed transformer oil conservators are used to compensate for the volume expansion and contraction of transformer oil due to temperature changes and to isolate air to prevent oil deterioration. Existing bladder-type oil conservators (including external and internal oil types) generally use pointer-type oil level gauges, whose transmission chain is: bladder (or float) → connecting rod → gear → pointer. This structure has the following inherent defects in actual operation: 1. The connecting rod is easily bent: During operation, due to uneven force on the capsule or float, the center of gravity of the connecting rod will shift, causing the capsule (or float) to exert lateral pressure on the connecting rod, bending the connecting rod. After the connecting rod is bent, not only will the transmission accuracy be lost, but it may also get stuck inside the cabinet, causing the oil level gauge to fail completely.

[0003] 2. Frequent gear failures: Existing gear transmissions suffer from problems such as backlash, tooth wear, broken teeth, and slipped teeth. In particular, when the connecting rod deviates or bends, the gear meshing condition deteriorates, the off-center load intensifies, and faults such as abnormal tooth wear and tooth breakage occur rapidly, further amplifying the oil level display error.

[0004] 3. Float is trapped by the capsule: The capsule may deform significantly when the oil level changes, potentially trapping the float and preventing it from floating normally with the oil level, resulting in a "false oil level" or the oil level display becoming stagnant.

[0005] 4. High-temperature demagnetization of magnets: Although the displacement is currently transmitted by placing magnets in transformer oil and using magnetic coupling, the long-term operating temperature of transformer oil is relatively high (up to 80°C or above). Ordinary magnets will gradually demagnetize at this temperature, resulting in weakened magnetism and eventually malfunction of the oil level gauge.

[0006] In view of this, we propose a capsule-type oil tank without a linkage level gauge. Summary of the Invention

[0007] The purpose of this invention is to provide a capsule-type oil tank without a connecting rod level gauge, in order to solve the problem mentioned in the background art that the oil level gauge of the existing capsule oil tank has poor reliability due to the inclusion of mechanical transmission links such as connecting rods and gears, and the existence of multiple failure modes, which has become a key weak link restricting the safe operation and intelligent maintenance of transformers.

[0008] To achieve the above objectives, the present invention provides a capsule-type oil storage tank without a linkage level gauge, comprising an oil storage tank body, wherein a capsule is disposed in the inner cavity of the oil storage tank body, and a linkageless oil level gauge mechanism is disposed on the outer wall of the oil storage tank body. The linkageless oil level gauge mechanism includes at least a square tube directly fixed to the outer wall of the oil storage tank body, wherein a guide positioning component is detachably disposed in the inner cavity of the square tube, and a magnetic float level gauge is also disposed on the outer surface of the square tube. The guide positioning component is equipped with a pull rope at the upper limit. The pull rope is kept taut by the elasticity of the guide positioning component. The end of the pull rope is sealed and extends into the interior of the oil storage tank. After passing the lower pulley and upper pulley on the guide positioning component, the pull rope forms a U-shaped bidirectional return path. The end of the pull rope is sealed and extends into the interior of the oil storage tank. The movable part of the capsule is vulcanized and connected with a reinforcing connecting plate, and the end of the pull rope is connected and fixed to the reinforcing connecting plate, wherein: The thickness of the reinforcing connecting plate gradually decreases from the center to the edge, and the thin edge has a sawtooth structure. The gradually thinning structure reduces the stress concentration at the interface, which optimizes the load environment of the sawtooth structure. The sawtooth structure provides mechanical fixation under the condition that the stress concentration has been reduced. The two work together to make the pull-out resistance of the connection interface significantly better than the sum of their individual effects. A linkage block is fixedly connected to the vertical rope segment between the lower pulley and the upper pulley, so that the linkage block only bears the tension in the vertical direction; the second end of the pull rope is connected to the center line of the capsule through a reinforcing connecting plate, which directly converts the expansion and contraction displacement of the capsule into the displacement of the vertical rope segment, and drives the magnet to move in the vertical direction through the linkage block, changing the magnetic connection area of ​​the magnetic float level gauge and outputting level information. Therefore, by maximizing the expansion and contraction displacement of the capsule through centerline positioning, the U-shaped path transforms the arbitrary direction input of the pull rope into the precise vertical displacement of the linkage block. After the two are combined, the displacement of the linkage block is exactly equal to the expansion and contraction displacement at the centerline of the capsule, and there is no stroke loss or nonlinear deformation.

[0009] As a further improvement to this technical solution, both the pull rope and the reinforcing connecting plate are made of stainless steel.

[0010] As a further improvement to this technical solution, the movable part of the capsule is provided with a groove that matches the bottom size of the reinforcing connecting plate, and the reinforcing connecting plate is embedded in the groove with a vulcanized connection.

[0011] As a further improvement to this technical solution, the guiding and positioning component includes at least: A support frame is inserted inside the square tube, forming a lateral force control zone at the rear of the support frame and a vertical displacement precision zone at the front of the support frame. A pull rope device is disposed on the outer surface of the support frame near the top. The pull rope device is used to elastically connect the end of the pull rope away from the capsule, so that the pull rope is kept taut. A linkage block is attached to a magnet that is fixed near the outer surface of the magnetic level gauge. The magnet and the magnetic level gauge form a magnetic connection area, and the magnetic level gauge outputs liquid level information under the action of magnetic force. It also includes a lower pulley and an upper pulley that are rotatably connected to the inner surfaces of both ends of the support frame, wherein: The end of the pull rope extends from inside the pull rope device to the fixed connection linkage block, and continues to be guided by the U-shaped bidirectional return path formed by the lower pulley and the upper pulley, before entering the inner cavity of the oil tank through the through hole on the outer wall of the square tube.

[0012] As a further improvement to this technical solution, the pull rope device includes a housing fixed to the outer surface of the support frame, a winding rod rotatably disposed inside the housing, the outer wall of the winding rod being fixedly connected to the end of the pull rope away from the capsule, and the pull rope being wound around the outer wall of the winding rod. A spring is disposed between the outer wall of the winding rod near both ends and the inner cavity of the housing, and the pull rope is kept taut by the elastic force of the spring.

[0013] As a further improvement to this technical solution, a guide rail is also provided on the outer surface of the support frame, and the linkage block is slidably connected to the guide rail in the vertical direction.

[0014] As a further improvement to this technical solution, the magnetic float level gauge includes at least: The housing is fixed to the outer wall of the square tube, and a non-magnetic stainless steel partition is formed between the housing and the square tube, with the magnet sliding on the left side of the partition. Magnetic flip panels, wherein multiple magnetic flip panels are provided and rotatably connected to the inner cavity of the housing, and each magnetic flip panel adopts a red and white two-color magnetic flip panel; An indicator panel is fixed to the outer wall of the housing and forms a transparent window facing multiple magnetic flips. The outer surface of the indicator panel is also provided with scale lines.

[0015] As a further improvement to this technical solution, a fixing plate is provided on the outer wall edge of the square tube near the top, and an mounting plate is provided on the top of the support frame. The fixing plate and the mounting plate are connected by bolts.

[0016] As a further improvement to this technical solution, a connecting sleeve is provided at the center of the upper surface of the reinforcing connecting plate, and a connecting piece is rotatably provided at the end of the pull rope near the capsule, the connecting piece being threadedly connected to the connecting sleeve. A threading device is provided between the outer wall of the oil storage tank and the outer wall of the square tube, and the threading device guides the pull rope from the inside of the square tube to the inside of the oil storage tank.

[0017] As a further improvement to this technical solution, a liquid level magnetic sensitive strip is also provided on the outer wall of the square tube. The output end of the liquid level magnetic sensitive strip is connected to a digital oil level gauge terminal. The digital oil level gauge terminal is used to detect the position of the magnet through the liquid level magnetic sensitive strip and output a 4-20mA current to reflect the liquid level.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The pull rope, made of flexible stainless steel, is connected to the capsule's centerline via a reinforcing connecting plate. This allows it to adapt to the multi-directional sway caused by capsule deformation. The pull rope end is located at the region furthest from the fixed constraint boundaries on both sides of the capsule. When the oil level changes cause the capsule to expand or contract, the longitudinal displacement at the centerline is the largest. Connecting the pull rope here amplifies the capsule's minute volume changes into significant pull rope displacement, thereby maximizing the sensitivity and resolution of oil level detection. The centerline position captures the capsule's maximum displacement, which is transmitted to the U-shaped path via the pull rope. In the bidirectional U-shaped path, a linkage block is fixedly connected to the vertical rope between the lower and upper pulleys. In this section, both the upper and lower pulleys are fixed guide wheels. The lateral force on the pull rope is mainly offset behind the support frame. Behind the support frame, the pull rope is constrained by the upper and lower pulleys to form a lateral force control zone. When it is transmitted to the front of the support frame, the pull rope remains vertical between the pull rope device and the lower pulley, reducing the lateral force acting on the linkage block and avoiding the off-center load and jamming caused by the squeezing between the linkage block and the guide rail as much as possible. Moreover, the vertical displacement of the linkage block is exactly equal to the movement of the pull rope, which is equal to the expansion and contraction displacement of the capsule at the centerline. This achieves precise transmission without stroke loss or nonlinear deformation, ensuring the precise vertical transmission of the capsule's maximum displacement. Furthermore, precisely because the connection point is located at the centerline where the deformation is most severe, it is necessary to use a reinforcing connecting plate with a thickness that gradually decreases from the center to the edge and has a serrated edge. This reduces the risk of the huge rubber tensile stress tearing the vulcanization interface of the capsule. The thickness of the reinforcing connecting plate gradually decreases from the center to the edge, so that the bending stiffness of the plate gradually decreases radially. The thin edge can undergo adaptive elastic bending with the expansion and contraction of the capsule, thereby mitigating the abrupt change in stiffness and deformation incoordination between the metal reinforcing connecting plate and the flexible capsule, and reducing the concentration of interfacial shear stress and peeling stress near the edge of the connecting plate. During vulcanization, the thin-edged serrated structure allows the capsule rubber to embed between the teeth, increasing the connection area between the rubber and the metal and the mechanical embedding path. When the pull rope applies an axial load to the capsule through the reinforcing connecting plate, the serrated structure shares part of the pull-out load through tooth surface pressure and local shear, and works together with the gradually thinning structure to improve the load-bearing capacity of the connection interface against axial pull-out and peeling damage. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the overall structure assembly of the present invention; Figure 2 This is a partial sectional view of the oil reservoir structure of the capsule-type oil level gauge without linkage of the present invention; Figure 3 This is an exploded view of the linkageless oil level gauge mechanism of the present invention; Figure 4 This is a schematic diagram of the structure and assembly of the guide and positioning component of the present invention; Figure 5 This is a partial schematic diagram of the guiding and positioning component of the present invention; Figure 6 This is a schematic diagram of the partitioning of the guide and positioning component of the present invention; Figure 7 For the present invention Figure 2 A schematic diagram of the structure at point A; Figure 8 For the present invention Figure 2 A schematic diagram of the structure at point B; Figure 9 For the present invention Figure 4 A schematic diagram of the structure at point C; Figure 10 This is a partial sectional view of the oil reservoir structure of the capsule-type external oil-free oil level gauge of the present invention.

[0020] The meanings of the labels in the diagram are as follows: 100. Oil storage tank body; 110. Capsule; 120. Wiring assembly; 200. Linkageless oil level gauge mechanism; 210. Square tube; 211. Fixing plate; 220. Guide positioning assembly; 221. Support frame; 2210. Mounting plate; 222. Pull rope device; 2221. Winding rod; 2222. Spring; 223. Linkage block; 2231. Magnet; 224. Guide rail; 225. Lower pulley; 226. Upper pulley; 230. Magnetic float level gauge; 231. Housing; 232. Magnetic float; 233. Indicator panel; 240. Pull rope; 241. Connector; 250. Reinforcing connecting plate; 251. Serrated structure; 252. Connecting sleeve; 300. Liquid level magnetic strip; 310. Digital oil level gauge terminal. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] Please see Figures 1-8 As shown, this embodiment provides a capsule-type oil storage tank without a linkage level gauge. The oil storage tank without a linkage level gauge adopts an in-capsule oil type and includes an oil storage tank body 100. The inner cavity of the oil storage tank body 100 is provided with a capsule 110. The capsule 110 is integrally molded from oil-resistant rubber. An oil storage cavity is formed inside the capsule 110. An air cavity is formed between the outer wall of the capsule 110 and the inner wall of the tank body. A linkageless oil level gauge mechanism 200 is provided on the outer wall of the oil storage tank body 100. The linkageless oil level gauge mechanism 200 includes at least a square tube 210 directly fixed to the outer wall of the oil storage tank body 100. A guide positioning component 220 is detachably provided in the inner cavity of the square tube 210. A magnetic float level gauge 230 is also provided on the outer surface of the square tube 210. A pull rope 240 is provided at the upper limit of the guide positioning component 220. The elasticity of the guide positioning component 220 keeps the pull rope 240 taut, and the guide positioning component 220 guides the pull rope 240 in a "U"-shaped bidirectional folding path. The end of the pull rope 240 is sealed and extends into the oil storage tank 100. A reinforcing connecting plate 250 is vulcanized and connected to the movable part of the capsule 110. The end of the pull rope 240 is connected and fixed to the reinforcing connecting plate 250. The end of the pull rope 240 is connected and set at the centerline of the capsule 110 through the reinforcing connecting plate 250. The thickness of the reinforcing connecting plate 250 gradually decreases from the center to the edge, and the thin edge has a sawtooth structure 251. When the capsule 110 expands and contracts, the guide positioning component 220 is driven by the pull rope 240 to adjust the magnetic connection area of ​​the magnetic float level gauge 230 and output the level information.

[0024] First, such as Figures 1-2 As shown: To avoid uneven force distribution on the capsule or float, causing a shift in the connecting rod's center of gravity, which could lead to lateral pressure on the connecting rod and bending it, resulting in loss of transmission accuracy and potential jamming inside the cabinet, causing complete failure of the oil level gauge, and to prevent significant deformation of the capsule during oil level changes, which could encase the float and prevent it from floating normally with the oil level, causing "false oil level" readings or stagnant oil level displays, and to prevent abnormal wear and breakage of the float due to issues with gear transmission, the current gear transmission method suffers from problems such as backlash, tooth wear, broken teeth, and slippage, leading to rapid failures such as abnormal tooth wear and tooth breakage, resulting in large errors in oil level display, and to avoid the problem of ordinary magnets being placed in transformer oil to transmit displacement via magnetic coupling, which can reach high operating temperatures of over 80°C. The problem of gradual demagnetization at this temperature, leading to weakened magnetism and eventual malfunction of the oil level gauge, is addressed by strengthening the connecting plate 250 to connect the end of the pull rope 240 to the movable part of the capsule 110. The pull rope 240 can sense the expansion, contraction, and deformation of the capsule 110 to generate tension or slack. The pull rope 240 will not be affected by offset or deformation in sensing the expansion and contraction force of the capsule 110. The pull rope 240 transmits the expansion and contraction force to drive the change of the magnetic connection area between the guide positioning component 220 and the magnetic float level gauge 230, moving the magnetic float level gauge 230 away from the oil tank 100. This not only prevents transformer oil from contacting the magnetic connection area of ​​the magnetic float level gauge 230, but also reduces the influence of temperature on the magnetic force. The change in the position of the magnetic connection area reflects the liquid level information, improving the accuracy of liquid level information detection. Meanwhile, the end of the pull rope 240 is connected to the centerline (equatorial plane) of the capsule 110 via a reinforcing connecting plate 250. This ensures that the end of the pull rope 240 is the area furthest from the fixed constraint boundaries on both sides of the capsule 110. When the oil level changes and causes the capsule 110 to expand or contract, the longitudinal displacement (stroke) at the centerline is the largest. Connecting the pull rope 240 here amplifies the small volume change of the capsule 110 into a significant displacement of the pull rope 240, thereby maximizing the sensitivity and resolution of oil level detection. Furthermore, because the connection point is chosen at the centerline where deformation is most severe, a reinforcing connecting plate 250 with a thickness that smoothly transitions from the center to the edge and has a serrated edge must be used. This reduces the risk of the large tensile stress in the rubber tearing the vulcanization interface of the capsule 110. The thickness gradually decreases smoothly from the center to the edge, causing the macroscopic shear stress at the interface of capsule 110 to decrease in the radial direction. The thin edge undergoes slight elastic bending deformation with capsule 110 to adapt to the deformation of capsule 110. The remaining stress after the gradual thinning transition is further resisted by the mechanical locking force provided by the serrated structure 251. Together, they reduce the probability of the pull rope 240 tearing and separating from capsule 110. The specific tooth height, tooth pitch, and tooth root radius parameters of the serrated structure 251 can be determined by those skilled in the art through conventional design based on the capsule size and rubber material properties. Taking a capsule 110 with a diameter of about 500mm as an example: the tooth height is 1.5-4mm, the tooth pitch is 3-8mm, the tooth root radius is 0.5-1.5mm, the tooth tip chamfer is 0.2-0.5mm, and the number of teeth is 6-12.

[0025] Secondly, based on the above, the specific structural features will be further disclosed in detail: First, in order to improve the effect of the pull rope 240 in sensing the expansion and contraction force of the capsule 110, both the pull rope 240 and the reinforcing connecting plate 250 are made of stainless steel. This ensures that when the capsule 110 generates expansion and contraction force, the pull rope 240 and the reinforcing connecting plate 250 themselves will not be subjected to tensile force and will not undergo large elongation deformation, thus improving the force transmission effect. At the same time, stainless steel is absolutely chemically inert to transformer oil, moisture, etc., and no additional coating is required. Its high strength allows the reinforcing connecting plate 250 to be made thinner, which is conducive to achieving better flexible gradient and reducing deformation stress.

[0026] Furthermore, the movable part of the capsule 110 is provided with a groove that matches the bottom size of the reinforcing connecting plate 250. The reinforcing connecting plate 250 is embedded in the groove and vulcanized, completely covering the entire reinforcing connecting plate 250 in the rubber groove of the capsule 110. This can thoroughly protect the bonding interface between the metal and the rubber from oil corrosion, resulting in extremely high reliability.

[0027] To achieve the goal of keeping the pull rope 240 taut through the elasticity of the guide positioning component 220 and to guide and limit the pull rope 240, the specific structure of the guide positioning component 220 is further disclosed, such as... Figures 3-6 As shown, the guide positioning assembly 220 includes at least: Support frame 221 is inserted inside square tube 210; A pull rope 222 is provided on the outer surface of the support frame 221 near the top. The pull rope 222 is used to elastically connect the end of the pull rope 240 away from the capsule 110, so that the pull rope 240 is kept taut. Linkage block 223, magnet 2231 is fixedly connected to the outer surface of magnetic float level gauge 230. Magnet 2231 and magnetic float level gauge 230 form a magnetic connection area. Under the action of magnetic force, magnetic float level gauge 230 outputs level information. It also includes a lower pulley 225 and an upper pulley 226 that are rotatably connected to the inner surfaces of both ends of the support frame 221, wherein: The end of the pull rope 240 extends from inside the pull rope device 222 to the fixed connection linkage block 223, and continues to extend to the U-shaped bidirectional reversal path formed by the lower pulley 225 and the upper pulley 226. After being guided, it enters the inner cavity of the oil tank 100 through the through hole on the outer wall of the square tube 210. The U-shaped bidirectional reversal path allows the pull rope to complete two directional changes before entering the oil tank 100.

[0028] Furthermore, to ensure more stable downward and upward sliding of the linkage block 223 and the magnet 2231, a guide rail 224 is also provided on the outer surface of the support frame 221. The linkage block 223 and the guide rail 224 are slidably connected in the vertical direction. In order to reduce the frictional resistance of the sliding connection between the linkage block 223 and the guide rail 224, a ball bearing connection can be used, which is known to those skilled in the art and will not be described in detail here. By having the linkage block 223 slide vertically along the guide rail 224, the direction of movement is positioned to avoid left and right sliding and improve the stability of the magnetic connection area.

[0029] In summary, as Figure 6As shown, a lateral force control zone is formed behind the support frame 221, and a vertical displacement precision zone is formed in front of the support frame 221. Due to the lateral force generated by the capsule 110 during expansion and contraction (which may involve multi-directional deformation, local wrinkling, or irregular expansion), the initial direction of the pull rope 240, after being drawn from the centerline, may change with the deformation of the capsule 110. Even if the pull rope 240 sways, it is initially constrained within the lateral force control zone by the upper pulley 226 and the lower pulley 225. The force is then transmitted to the vertical displacement precision zone. The rope segment is located between the pulley 225 and the rope puller 222. The rope 240 moves vertically, and the lateral force transmitted to the linkage block 223 has been greatly weakened, reducing the sway of the rope 240 and reducing the off-center load and jamming between the linkage block 223 and the guide rail 224. Moreover, the vertical displacement of the linkage block 223 is exactly equal to the movement of the rope 240, which is equal to the expansion and contraction displacement of the capsule 110 at the center line. This achieves accurate transmission without stroke loss or nonlinear deformation, ensuring the accurate vertical transmission of the maximum displacement of the capsule and improving the accuracy of oil level detection. It should be noted that when the oil volume of capsule 110 changes, the actual movement at its centerline is a three-dimensional resultant displacement, including radial expansion and axial displacement components. After the pull rope 240 is connected to the centerline, its axial displacement component is directly transmitted by the pull rope 240, while the radial expansion component and the lateral force generated by asymmetric deformation, local wrinkles, or non-uniform expansion are isolated through the following mechanism: After the pull rope 240 is led out from the centerline of the capsule 110, its initial direction may deflect with the deformation of the capsule 110. This deflection is first greatly weakened in the lateral force control zone behind the support frame 221 by the constraint of the upper pulley 226 and the lower pulley 225. After entering the vertical displacement precision zone in front of the support frame 221, the pull rope 240 remains vertical between the lower pulley 225 and the pull rope device 222. The linkage block 223 slides vertically with the guide rail 224, and the lateral force is not transmitted to the linkage block 223. Therefore, even if the capsule 110 undergoes asymmetrical deformation, the pull rope 240 still only transmits the longitudinal displacement at the centerline to the linkage block 223. The vertical displacement of the linkage block 223 is still equal to the longitudinal displacement at the centerline of the capsule 110, and does not depend on whether the deformation of the capsule 110 is symmetrical. Therefore, when the capsule 110 expands and contracts, the resulting expansion and contraction force pulls the end of the pull rope 240. The pull rope 240 slides sequentially along the upper pulley 226 and the lower pulley 225 inside the pull rope device 222, synchronously driving the linkage block 223 to slide up and down. This causes the magnetic force generated by the magnet 2231 to switch positions with the magnetic float level gauge 230, changing the magnetic connection area and allowing the magnetic float level gauge 230 to reflect the liquid level. During this process, the pull rope 240 remains taut due to the elasticity of the pull rope device 222. This makes the expansion and contraction force transmission and the movement of the pull rope 240 more stable, improving the accuracy of liquid level detection. On the other hand, the pull rope device 222, in conjunction with the lower pulley 225 and the upper pulley 226, makes the sliding guidance of the pull rope 240 more orderly, keeping the magnet 2231 away from the oil and preventing the pull rope 240 from becoming messy and knotted, thus affecting the stability of the magnetic connection area and further improving the accuracy of the magnetic float level gauge 230 in reflecting the liquid level.

[0030] Specifically, to ensure a tightening effect, such as Figure 9 As shown, the pull rope device 222 includes a housing fixed to the outer surface of the support frame 221. A winding rod 2221 is rotatably mounted inside the housing. The outer wall of the winding rod 2221 is fixedly connected to the end of the pull rope 240 away from the capsule 110, and the pull rope 240 is wound around the outer wall of the winding rod 2221. Springs 2222 are installed between the outer walls of the winding rod 2221 near both ends and the inner cavity of the housing. The elastic force of the springs 2222 drives the pull rope 240 to remain taut. Therefore, when the expansion and contraction force on one end of the pull rope 240 is a tension force, the tension is transmitted to the other end of the pull rope 240, causing the winding rod 2222 to... 1. Rotating the pull cord 240 causes it to slide outward from the outer shell. At the same time, the spring 2222 is in an outward expansion state. Under the elastic force of the spring 2222, the pull cord 240 is kept taut, causing the linkage block 223 and the magnet 2231 to slide downward. When the capsule 110 contracts, causing the tension on the pull cord 240 to decrease, under the elastic force of the spring 2222, the winding rod 2221 rotates in the opposite direction to wind the pull cord 240 inward into the outer shell, and causes the linkage block 223 and the magnet 2231 to slide upward. At the same time, the pull cord 240 is wrapped around the outer wall of the winding rod 2221 to prevent the pull cord 240 from becoming messy and tangled.

[0031] To enable the magnetic float level gauge 230 to output liquid level information, the specific structure of the magnetic float level gauge 230 needs to be further disclosed, such as... Figure 3 and Figure 8 As shown, the magnetic float level gauge 230 includes at least: The housing 231 is fixed to the outer wall of the square tube 210. A non-magnetic stainless steel partition plate is formed between the housing 231 and the square tube 210, and the magnet 2231 slides on the left side of the partition plate. Magnetic flip 232, multiple magnetic flip 232 are provided and are rotatably connected to the inner cavity of housing 231, each magnetic flip 232 is a red and white two-color magnetic flip 232; Indicator panel 233 is fixed to the outer wall of housing 231 and forms a transparent window facing multiple magnetic flips 232. The outer surface of indicator panel 233 is also provided with scale lines. Therefore, when the liquid level changes and the capsule 110 expands and contracts, the pull rope 240 simultaneously drives the linkage block 223 and the magnet 2231 to slide. The magnet 2231 approaches a certain magnetic flap 232, forming a magnetic connection area. According to the principle of opposite poles attracting, the attraction of the magnet 2231 to the magnet inside the magnetic flap 232 will be greater than the stabilizing force of the magnetic flap 232 itself, thus driving the magnetic flap 232 to rotate 180 degrees. This rotation exposes the red side of the magnetic flap 232, which indicates the presence of liquid. Meanwhile, the side of the magnetic flap 2231 located at the magnet 2232... The magnetic flip plate 232 above 31 remains white, forming a clear red and white interface. The red and white interface can be observed through the transparent window, and the real-time liquid level height can be compared with the scale output. Conversely, when the liquid level drops, the magnet 2231 also drops and slowly moves away from the previously flipped magnetic flip plate 232. After the attraction of the magnet 2231 disappears, the flip plate will rotate again due to the influence of gravity or the mutual magnetic force of other flip plates, resetting to reveal the white side. The range of the red area shrinks accordingly, and the red and white interface continues to move down, reflecting the liquid level change in real time.

[0032] To facilitate maintenance and repair of the guide positioning component 220, such as Figure 3 As shown, a fixing plate 211 is provided on the outer edge of the square tube 210 near the top, and an mounting plate 2210 is provided on the top of the support frame 221. The fixing plate 211 and the mounting plate 2210 are connected by bolts. The square tube 210 and the guide positioning assembly 220 can be disassembled and assembled by tightening the bolts, which facilitates maintenance. For example, the magnet 2231 can be replaced at any time when its magnetism weakens, which improves the accuracy of liquid level output. Furthermore, when the fixing plate 211 and the mounting plate 2210 are connected and fixed, the upper end of the square tube 210 is sealed by a rubber ring and a vacuum port is provided. The square tube 210 is completely sealed and can withstand vacuum.

[0033] When connecting the pull rope 240 and the reinforcing connecting plate 250, in order to facilitate disassembly and maintenance, a connecting sleeve 252 is provided at the center of the upper surface of the reinforcing connecting plate 250. A connector 241 is rotatably provided at the end of the pull rope 240 near the capsule 110. The connector 241 is threadedly connected to the connecting sleeve 252, which makes it easy to unscrew the connector 241 at any time to detach it from the connecting sleeve 252. This facilitates the removal of the pull rope 240 separately, making maintenance and replacement easier and improving the overall service life.

[0034] Furthermore, in order to reduce the shaking of the pull rope 240 inside the oil tank 100, such as Figure 1As shown, a threading component 120 is provided between the outer wall of the oil storage tank 100 and the outer wall of the square tube 210. The threading component 120 guides the pull rope 240 from the inside of the square tube 210 to the inside of the oil storage tank 100, preventing the pull rope 240 from deviating when extending from the square tube 210 to the inner cavity of the oil storage tank 100, and preventing shaking during force transmission, thus improving safety and stability. The threading component 120 is equipped with an anti-skid pulley and a sealing ring to ensure a sealing effect.

[0035] In addition, to better display the liquid level, such as Figure 1 As shown, a liquid level magnetic stripe 300 is also provided on the outer wall of the square tube 210. The output end of the liquid level magnetic stripe 300 is connected to a digital oil level gauge terminal 310. The digital oil level gauge terminal 310 is used to detect the position of the magnet 2231 through the liquid level magnetic stripe 300 and outputs a 4-20mA current to reflect the liquid level. The liquid level magnetic strip 300 uses multiple magnetic sensing elements (such as Hall sensors) and corresponding signal processing circuits to enable the magnetic sensing elements to sense the magnetic field changes of the magnet 2231 and output corresponding voltage signals. The digital oil level gauge terminal 310 receives the electrical signals from the liquid level magnetic strip 300 and converts them into standard 4-20mA analog current signals, corresponding to liquid levels of 0-100%. The control system can calculate the liquid level height by detecting the current in the detection loop.

[0036] In summary, during the assembly of this invention, the magnetic float level gauge 230 is fixed to the outer wall of the square tube 210 by bolt connection, the square tube 210 is fixed to the outer end of the oil tank 100 by bolt connection, and then the pull rope device 222 is fixed to the upper outer surface of the support frame 221 by bolt connection. The pull rope 240 is pulled out from the inside of the pull rope device 222, and after the linkage block 223 is fixed on the pull rope 240, it passes through the wire threading part 120 between the square tube 210 and the oil tank 100 in sequence along the lower pulley 225 and the upper pulley 226, so that the pull rope 240 extends into the inner cavity of the oil tank 100. Meanwhile, the reinforcing connecting plate 250 is fixed to the movable part of the capsule 110 by vulcanization. The movable part is mainly the part that can move up and down with the rise and fall of the oil when the oil is injected into the capsule 110. It is preferably located at the center line of the capsule 110 to make the force more even. Then, the connecting piece 241 at the end of the pull rope 240 is threaded onto the connecting sleeve 252 to make the pull rope 240 and the capsule 110 evenly connected and fixed. When the capsule 110 expands and contracts due to changes in the amount of oil, the expansion and contraction force is evenly transmitted through the pull rope 240, causing the pull rope 240 to wind and unwind inside the pull rope device 222. This causes the linkage block 223 and the magnet 2231 to slide up and down synchronously, changing the magnetic connection area formed by the magnet 2231 and any magnetic flip plate 232, thus achieving non-contact and visual liquid level indication.

[0037] In summary, after the entire assembly of the present invention is completed, one end of the pull rope 240 is threadedly connected to the connecting sleeve 252 on the reinforcing connecting plate 250 through the connector 241, and the reinforcing connecting plate 250 is vulcanized and fixed at the center line of the capsule 110; the other end of the pull rope 240 passes through the threading piece 120 and enters the inner cavity of the square tube 210, passes around the upper pulley 226 and then folds down, then passes around the lower pulley 225 and then folds up, forming a U-shaped bidirectional folding path, and finally extends to the inside of the pull rope device 222 and is wound around the outer wall of the coil 2221; the linkage block 223 is fixedly connected to the vertical rope segment between the lower pulley 225 and the upper pulley 226; and the magnet 2231 is fixedly connected to the linkage block 223 near the outer surface of the magnetic float level gauge 230. When the oil level in the oil tank 100 increases, the capsule 110 expands, and its midline moves longitudinally away from the fixed constraint boundary of the capsule, pulling the pull rope 240. The tension on the pull rope 240 is transmitted to the pull rope device 222, which overcomes the elastic force of the spring 2222 and causes the winding rod 2221 to rotate and unwind. The pull rope 240 slides outward from the outer shell. At the same time, the pull rope 240 slides in the U-shaped bidirectional return path, causing the linkage block 223 fixed to the vertical rope segment to slide downward along the guide rail 224. The magnet 2231 moves downward accordingly. After the magnet 2231 moves to the new position, it forms a magnetic connection area with the magnetic flip plate 232 at the corresponding position, driving the magnetic flip plate 232 to rotate 180 degrees to expose the red side. The transparent window of the indicator panel 233 displays the change of the red and white interface, and the liquid level height can be read by referring to the scale line. At the same time, the liquid level magnetic strip 300 senses the change in the magnetic field of the magnet 2231 and outputs a corresponding voltage signal to the digital oil level gauge terminal 310, which is converted into a 4-20mA standard current signal to reflect the liquid level; When the oil level in the oil tank 100 decreases, the capsule 110 contracts, the tension on the pull rope 240 decreases, and the elastic force of the spring 2222 drives the winding rod 2221 to rotate in the opposite direction to wind up the pull rope 240. The pull rope 240 is wound into the outer shell and kept taut, which drives the linkage block 223 and the magnet 2231 to slide upward along the guide rail 224. After the magnet 2231 moves upward, it moves away from the magnetic flip plate 232 that was originally flipped. Under the action of gravity and the magnetic force of the adjacent magnetic flip plate, the magnetic flip plate 232 resets and exposes the white surface. The red and white interface moves upward, reflecting the drop in liquid level in real time. During the above process, the lateral force generated by the non-uniform expansion, local wrinkling, or asymmetric deformation of the capsule 110 is transmitted to the area behind the support frame 221 via the pull rope 240. The upper pulley 226 and lower pulley 225 in the area behind the support frame 221 initially constrain the pull rope 240, causing the sway of the pull rope 240 to mainly occur behind the support frame 221 (i.e., the lateral force control area). The section of the pull rope 240 transmitted to the front of the support frame 221 (i.e., the vertical displacement precision area) is located between the lower pulley 225 and the pull rope device. Between 222, extending vertically, since both the upper pulley 226 and the lower pulley 225 are fixed guide wheels, and the linkage block 223 is slidably connected to the guide rail 224 in the vertical direction, the movement of the pull rope 240 on the vertical rope segment is directly converted into the vertical displacement of the linkage block 223. The lateral component force cannot be transmitted to the linkage block 223. Therefore, even if the capsule 110 undergoes asymmetrical deformation, the vertical displacement of the linkage block 223 is still exactly equal to the longitudinal displacement of the pull rope 240 at the centerline, and there is no stroke loss or nonlinear deformation.

[0038] Example 2:

[0039] like Figure 10 As shown, the oil level gauge-less oil tank can also be a capsule-type tank, including an oil tank body 100. A capsule 110 is installed inside the oil tank body 100. An oil storage cavity (containing transformer oil) is formed between the outer wall of the capsule 110 and the inner wall of the oil tank body 100. An air cavity (communicating with the atmosphere via a breather and dehumidifier) ​​is formed inside the capsule 110. The capsule 110 is vertically fixed to the side of the oil tank body 100 via a square tube 210. The lower end of the square tube 210 connects to the air cavity inside the capsule within the oil tank body 100. The connection is made through an opening in the side wall of the oil storage tank 100. The upper end of the square tube 210 is closed and equipped with a vacuum interface. The square tube 210 is completely sealed and can withstand vacuum. The first end of the pull rope 240 is fixed to the center of the lower plane inside the capsule 110 (movable part). The second end passes upward through the sealing wire thread 120 at the top of the oil storage tank 100 and enters the inside of the square tube 210. The pull rope 240 is fixedly connected to the linkage block 223 and the magnet 2231 near the second end and can slide up and down along the guide rail 224. Furthermore, in Embodiment 2, the square tube 210 is also equipped with a guide positioning component 220, which has the same structure as in Embodiment 1. It includes a support frame 221, a pull rope device 222, a linkage block 223, a guide rail 224, a lower pulley 225, and an upper pulley 226. The pull rope 240 is led out from the center of the lower plane inside the capsule 110, passes upward through the threading piece 120 at the top of the oil storage tank 100, enters the inner cavity of the square tube 210, passes around the upper pulley 226 and then turns downward, passes around the lower pulley 225 and then turns upward, forming a U-shaped bidirectional turning path, and finally extends to the inside of the pull rope device 222. The linkage block 223 is fixedly connected to the vertical rope segment between the lower pulley 225 and the upper pulley 226. The magnet 2231 is fixedly connected to the outer surface of the linkage block 223 near the magnetic float level gauge 230. The spring 2222 in the pull rope device 222 keeps the pull rope 240 taut. Its working principle is the same as in Embodiment 1.

[0040] During operation, the oil level rises → the oil pressure in the oil storage chamber increases → the capsule 110 is deformed under pressure, and the lower plane moves upward → the pull rope 240 drives the magnet 2231 inside the square tube 210 to move upward → the magnetic flip plate 232 on the outside of the square tube 210 flips to display the high oil level; at the same time, the digital oil level gauge terminal 310 receives the electrical signal from the liquid level magnetic sensitive strip 300 and converts it into a standard 4-20mA analog current signal, corresponding to a liquid level of 0-100%. The control system can calculate the liquid level height by detecting the current in the detection loop.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A capsule-type oil reservoir without a linkage level gauge, comprising an oil reservoir body (100), wherein a capsule (110) is disposed in the inner cavity of the oil reservoir body (100), characterized in that: The outer wall of the oil storage tank (100) is provided with a linkageless oil level gauge mechanism (200). The linkageless oil level gauge mechanism (200) includes at least a square tube (210) directly fixed to the outer wall of the oil storage tank (100). The inner cavity of the square tube (210) is detachably provided with a guide positioning component (220). The outer surface of the square tube (210) is also provided with a magnetic float level gauge (230). The guide positioning component (220) is provided with a pull rope (240) at the upper limit. The pull rope (240) is kept taut by the elasticity of the guide positioning component (220). After passing through the lower pulley (225) and upper pulley (226) on the guide positioning component (220), the pull rope (240) forms a U-shaped bidirectional return path. The end of the pull rope (240) is sealed and extends into the interior of the oil storage tank (100). The movable part of the capsule (110) is vulcanized and connected to a reinforcing connecting plate (250), and the end of the pull rope (240) is connected and fixed to the reinforcing connecting plate (250), wherein: The thickness of the reinforcing connecting plate (250) gradually decreases from the center to the edge, and the thin edge has a sawtooth structure (251). A linkage block (223) is fixedly connected to the vertical rope segment between the lower pulley (225) and the upper pulley (226), so that the linkage block (223) only bears the tension in the vertical direction; the second end of the pull rope (240) is connected to the center line of the capsule (110) through the reinforcing connecting plate (250), which directly converts the expansion and contraction displacement of the capsule (110) into the displacement of the vertical rope segment, and drives the magnet (2231) to move in the vertical direction through the linkage block (223), changing the magnetic connection area of ​​the magnetic float level gauge (230) and outputting the level information.

2. The capsule-type oil tank without a linkage level gauge according to claim 1, characterized in that: Both the pull rope (240) and the reinforcing connecting plate (250) are made of stainless steel.

3. The capsule-type oil tank without a linkage level gauge according to claim 2, characterized in that: The movable part of the capsule (110) is provided with a groove that matches the bottom size of the reinforcing connecting plate (250), and the reinforcing connecting plate (250) is embedded in the groove by vulcanization.

4. The capsule-type oil tank without a linkage level gauge according to claim 1, characterized in that: The guide positioning component (220) includes at least: A support frame (221) is inserted inside the square tube (210), and a lateral force control area is formed behind the support frame (221), and a vertical displacement precision area is formed in front of the support frame (221). A pull rope (222) is provided on the outer surface of the support frame (221) near the top. The pull rope (222) is used to elastically connect the end of the pull rope (240) away from the capsule (110) so that the pull rope (240) is kept taut. Linkage block (223), wherein a magnet (2231) is fixedly connected to the outer surface of the magnetic float level gauge (230), wherein the magnet (2231) and the magnetic float level gauge (230) form a magnetic connection area, and the magnetic float level gauge (230) is prompted to output level information under the action of magnetic force; It also includes a lower pulley (225) and an upper pulley (226) that are rotatably connected to the inner surfaces of both ends of the support frame (221), wherein: The end of the pull rope (240) extends from inside the pull rope device (222) to the fixed connection linkage block (223), and continues to extend to the U-shaped bidirectional return path formed by the lower pulley (225) and the upper pulley (226) before entering the inner cavity of the oil storage tank (100) through the through hole on the outer wall of the square tube (210).

5. The capsule-type oil tank without a linkage level gauge according to claim 4, characterized in that: The pull rope device (222) includes a housing fixed to the outer surface of the support frame (221). A coil rod (2221) is rotatably arranged inside the housing. The outer wall of the coil rod (2221) is fixedly connected to the end of the pull rope (240) away from the capsule (110). The pull rope (240) is wound around the outer wall of the coil rod (2221). A spring (2222) is arranged between the outer wall of the coil rod (2221) near both ends and the inner cavity of the housing. The elastic force of the spring (2222) drives the pull rope (240) to remain taut.

6. The capsule-type oil tank without a linkage level gauge according to claim 5, characterized in that: The outer surface of the support frame (221) is also provided with a guide rail (224), and the linkage block (223) is slidably connected to the guide rail (224) in the vertical direction.

7. The capsule-type oil tank without a linkage level gauge according to claim 6, characterized in that: The magnetic level gauge (230) includes at least: The housing (231) is fixed to the outer wall of the square tube (210). A non-magnetic stainless steel partition is formed between the housing (231) and the square tube (210), and the magnet (2231) slides on the left side of the partition. Magnetic flip plate (232), multiple magnetic flip plates (232) are provided and are rotatably connected to the inner cavity of the housing (231), each magnetic flip plate (232) is a red and white two-color magnetic flip plate; The indicator panel (233) is fixed to the outer wall of the housing (231) and forms a transparent window facing multiple magnetic flip plates (232). The outer surface of the indicator panel (233) is also provided with scale lines.

8. The capsule-type oil tank without a linkage level gauge according to claim 7, characterized in that: The square tube (210) has a fixing plate (211) near the top edge of its outer wall, and the support frame (221) has an mounting plate (2210) on its top. The fixing plate (211) and the mounting plate (2210) are connected by bolts.

9. The capsule-type oil tank without a linkage level gauge according to claim 7, characterized in that: A connecting sleeve (252) is provided at the center of the upper surface of the reinforcing connecting plate (250), and a connector (241) is rotatably provided at the end of the pull rope (240) near the capsule (110), and the connector (241) is threadedly connected to the connecting sleeve (252). A threading device (120) is provided between the outer wall of the oil storage tank (100) and the outer wall of the square tube (210), and the threading device (120) guides the pull rope (240) from the inside of the square tube (210) to the inside of the oil storage tank (100).

10. The capsule-type oil tank without a linkage level gauge according to claim 7, characterized in that: The outer wall of the square tube (210) is also provided with a liquid level magnetic strip (300). The output end of the liquid level magnetic strip (300) is connected to a digital oil level gauge terminal (310). The digital oil level gauge terminal (310) is used to detect the position of the magnet (2231) through the liquid level magnetic strip (300) and output a 4-20mA current to reflect the liquid level.

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