Digitized gas relay based on double-floating-ball structure

Abstract

The invention relates to the technical field of relays, in particular to a digital gas relay based on a double-floating-ball structure. Comprising a shell and an inner core on the inner side of the shell; the arc-shaped outer wall of the shell is symmetrically and fixedly connected with a flange and an observation window; the upper end opening of the shell is covered with the upper cover; the inner core is fixedly connected to the lower surface of the upper cover; the upper surface of the upper cover is fixedly connected with a junction box and an exhaust assembly; the upper cover is formed by combining a round cover and a frame cover; a cover hole is formed in the center of the frame cover; the round cover is rotationally connected in the cover hole in a sealing manner; the junction box, the exhaust assembly and the inner core are all connected to the round cover. The round cover is rotated to drive the inner core to rotate, so that operation and maintenance personnel can observe the state of internal parts more comprehensively without dead corners and find the conditions of fine displacement of the floating ball, abnormal contact of a dry reed contact and the like in time, fault reasons and fault positions can be judged accurately, the troubleshooting efficiency and accuracy are improved, and the fault detection efficiency is improved. And powerful support is provided for timely repairing equipment.

Description

Technical Field

[0001] The invention relates to the technical field of relays, in particular to a digital gas relay based on a double-float structure. Background Art

[0002] The digital gas relay based on the double float structure is a key protection device for monitoring the internal state of the transformer. It realizes real-time feedback on the operation status of the transformer by accurately monitoring the oil level change and internal gas generation of the transformer, providing important support for ensuring the stable operation of the power system. It is widely used in various power transformer systems. Whether it is power plants, substations, or transformers in industrial enterprises and urban power grids, they cannot do without the protection of gas relays. It is usually installed on the connecting pipe between the transformer body and the oil storage cabinet, directly contacting the transformer oil and monitoring its internal conditions at all times. With the continuous growth of electricity demand and the continuous expansion of the scale of the power grid, the safe and stable operation of the transformer as the core equipment of power transmission and distribution is of vital importance. With its advantages such as high-precision monitoring and remote data transmission, the digital gas relay can better meet the needs of intelligent operation and maintenance of modern power systems and has broad application prospects. In the future construction of smart grids, it will become one of the key devices to realize the automation of transformer status monitoring and intelligent fault warning.

[0003] The gas relay mainly relies on the double float structure to sense the changes in the internal state of the transformer. During normal operation, the oil level of the transformer is relatively stable and the float is in a certain position. When a fault occurs inside the transformer, such as local overheating, discharge, etc., it will decompose and produce gas, causing the oil level to change. At this time, the float will rise or fall with the oil level, triggering the action of the reed contact connected to it. The reed contact converts the mechanical action into an electrical signal, which is transmitted to the external monitoring system through the junction box, thereby realizing the fault alarm and signal transmission functions. At the same time, the digital sensor will collect data such as the float position and action frequency in real time, and perform digital processing and analysis to provide operation and maintenance personnel with more accurate transformer operation status information.

[0004] The observation window in the gas relay is generally made of transparent material and installed on the housing, so that the operation and maintenance personnel can directly observe the internal oil level, float status, etc. without disassembling the equipment, so as to preliminarily judge the operating status of the equipment; at present, a major defect of the gas relay is that the observation angle of the observation window is limited. Although the observation window can provide a certain way to view the internal situation, there are many blind spots due to its fixed position and limited visual range. For example, it is difficult to fully and clearly observe some subtle displacement changes of the double float on the inner core and the contact status of the reed contact. This may result in the failure to timely discover some potential minor faults or component abnormalities during the equipment inspection process. When a minor fault occurs inside the transformer, the tiny movement of the float may not be accurately captured through the observation window, which affects the early judgment and accurate troubleshooting of the fault, delays the maintenance time, and increases the risk of equipment damage and hidden dangers in the operation of the power system. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, the present invention proposes a digital gas relay based on a double float structure. The present invention drives the inner core to rotate by rotating the round cover, so that the operation and maintenance personnel can observe the status of internal components more comprehensively and without blind spots, and promptly discover the slight displacement of the float, abnormal contact of the reed contact, etc., which is helpful to accurately determine the cause and location of the fault, improve the efficiency and accuracy of fault detection, and provide strong support for timely repair of equipment.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the digital gas relay based on the double float structure described in the present invention includes a shell and an inner core inside the shell; the arc-shaped outer wall of the shell is symmetrically fixed with a flange and an observation window; the upper port cover of the shell is closed with the upper cover; the inner core is fixedly connected to the lower surface of the upper cover; the upper surface of the upper cover is fixedly connected to the junction box and the exhaust component; the upper cover is composed of a round cover and a frame cover; a cover hole is provided at the center of the frame cover; the round cover is rotatably sealed and connected in the cover hole; the junction box, the exhaust component and the inner core are all connected to the round cover; the frame cover is connected to the upper port of the shell by bolts.

[0007] Preferably, the center of the round cover is just below and located at the lower end of the inner core, and is fixedly connected to a card seat; the lower surface of the card seat is fixedly connected to a square card block; the lower end of the card block is conical; a bottom hole is provided through the center of the bottom wall of the shell; the bottom hole is rotatably sealed and connected to the chassis; the upper surface of the chassis is provided with a square card slot aligned with the card block; the card block can be inserted into the card slot; the lower surface of the chassis is elastically slidably connected to a locking rod up and down; the locking rod is laterally fixedly connected to a locking plate at the lower end; locking blocks are evenly arranged on the lower surface of the shell around the bottom hole; the end of the locking plate is inserted into the gap between adjacent locking blocks under the pull of elastic force.

[0008] Preferably, a lower port of the bottom hole protrudes from the lower surface of the chassis; the locking plate is U-shaped; and a toggle gap is formed between the upper edge of the locking plate and the outer bottom wall of the shell.

[0009] Preferably, a square groove is provided inside the chassis and directly below the card slot; a square plate is slidably and sealedly connected in the square groove; the lower surface of the square plate is connected to the lower inner wall of the square groove through a first spring; the square plate divides the square groove into an upper cavity and a lower cavity; the upper end of the locking rod is fixedly connected to the lower surface of the square plate; the lower end of the locking rod passes through the chassis and extends to the bottom of the chassis; the locking rod is slidably and sealedly connected to the chassis; the upper cavity is connected to the inner side of the shell; the first spring is sleeved on the outer wall of the locking rod; the inner edge of the observation window is fixedly connected to a transparent lens; the lower position of the outer side of the observation window is hinged to the window door through a torsion spring; the outer wall of the observation window is blocked by the window door and is close to the torsion spring. A push groove is provided; the push groove is slidably and sealedly connected to a push block; the outer wall of the chassis is provided with a lower ring groove; the bottom of the lower ring groove is connected to the lower cavity; the bottom of the push groove is connected to the lower ring groove through a first liquid hole; the lower cavity is filled with a liquid medium.

[0010] Preferably, an extension groove is provided on the lower surface of the push block; the extension block is connected to the extension block by a sliding seal in the extension groove; a guide surface is provided on the end of the extension block away from the bottom of the extension groove and inclined toward the center of the shell; the bottom of the extension groove is connected to the end of the push block close to the bottom of the push groove through a second liquid hole.

[0011] Preferably, the push block is connected to the bottom of the push groove via a first tension spring; the extension block is connected to the bottom of the extension groove via a second tension spring; and the tension force of the first tension spring obtained is smaller than the tension force of the second tension spring.

[0012] Preferably, an upper annular groove is provided on the outer wall of the chassis; an air outlet pipe is fixedly connected to the upper position of the inner wall of the shell; the air outlet pipe is located directly above the lens and faces the lens; a first air hole is provided inside the shell; one end of the first air hole is connected to the air outlet pipe, and the other end is connected to the upper annular groove; the upper annular groove is connected to the upper cavity.

[0013] Preferably, the inner wall of the slot is movably connected to the anti-blocking block; and the anti-blocking block is connected to the bottom of the slot via a second spring.

[0014] Preferably, the anti-blocking block is provided with a one-way air outlet hole running through the top and bottom; the bottom of the card slot is connected with the upper cavity through a one-way air inlet hole; and the anti-blocking block is slidably and sealingly connected with the inner wall of the card slot.

[0015] Preferably, the aperture of the first liquid hole at one end close to the lower cavity is larger than the aperture of the first liquid hole at one end close to the push groove.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention drives the inner core to rotate by rotating the round cover, so that the operation and maintenance personnel can observe the status of internal components more comprehensively without blind spots, and timely discover the slight displacement of the float, abnormal contact of the reed contact, etc., which is helpful to accurately determine the cause and location of the fault, improve the efficiency and accuracy of fault detection, and provide strong support for timely repair of equipment.

[0017] 2. In the present invention, the end of the locking piece is inserted into the gap of the corresponding locking block as the locking piece moves upward, so that the inner core that has completed the rotation is locked and cannot rotate. On the one hand, the connection direction of the junction box and the exhaust component can be changed. On the other hand, the inner core that has completed the rotation is more stable during the working process, and the stability of use is improved.

[0018] 3. The present invention drives the square plate to move downward in the square groove through the locking piece, so that the window door automatically flips open on the observation window and the inner core is unlocked and rotated. In addition, in the process of loosening the locking piece, the window door will automatically block the observation window and the inner core is rotated and locked, thereby facilitating the observation of the operation and maintenance personnel while improving the stability of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0020] Figure 1 is a stereogram of the present invention; Figure 2 It is the bottom structure position diagram of the present invention; Figure 3 It is a three-dimensional diagram of the inner core and the upper cover of the present invention; Figure 4 is a three-dimensional diagram of the housing in the present invention; Figure 5 is a cross-sectional view of the present invention; Figure 6 yes Figure 5 The enlarged view of point A in the middle; Figure 7 yes Figure 5 The enlarged view of point B in the middle; Figure 8 yes Figure 5 Enlarged view of point C in the middle.

[0021] In the figure: shell 1, flange 11, observation window 12, bottom hole 13, locking block 14, lens 15, push groove 16, first liquid hole 161, air outlet pipe 17, first air hole 171, inner core 2, card seat 21, card block 22, upper cover 3, junction box 31, exhaust assembly 32, round cover 33, frame cover 34, cover hole 35, bolt 36, chassis 4, card groove 41, square groove 42, upper cavity 43, lower cavity 44, lower ring groove 45, upper ring groove 46, one-way air inlet 47, square plate 5, locking rod 51, locking piece 52, toggle gap 53, first spring 54, window door 6, torsion spring 61, push block 7, extension groove 71, extension block 72, guide surface 73, second liquid hole 74, first tension spring 75, second tension spring 76, anti-blocking block 8, second spring 81, one-way air outlet 82. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0023] like Figures 1 to 8 As shown, the present invention includes the following embodiments: Embodiment 1: A digital gas relay based on a double float structure comprises a shell 1 and an inner core 2 on the inner side of the shell 1; the arc-shaped outer wall of the shell 1 is symmetrically fixed with a flange 11 and an observation window 12; the upper port of the shell 1 is covered with an upper cover 3; the inner core 2 is fixedly connected to the lower surface of the upper cover 3; the upper surface of the upper cover 3 is fixedly connected to a junction box 31 and an exhaust assembly 32; the upper cover 3 is composed of a round cover 33 and a frame cover 34; a cover hole 35 is provided at the center of the frame cover 34; the round cover 33 is rotatably sealed and connected in the cover hole 35; the junction box 31, the exhaust assembly 32 and the inner core 2 are all connected to the round cover 33; the frame cover 34 is connected to the upper port of the shell 1 by bolts 36.

[0024] After the two symmetrical flanges 11 on the relay are connected to the connecting pipe between the transformer body and the oil storage cabinet, the junction box 31 is connected to the corresponding line, and the exhaust component 32 is connected to the corresponding exhaust hose, the relay is started to work. When the relay is operating normally, the inside is filled with transformer oil, and the float is in an upward position; when a minor fault occurs inside the transformer, the gas generated by the decomposition of the transformer oil gathers in the air chamber at the top of the relay, forcing the oil level to drop, and the float drops to the liquid level position, and the magnet on it causes the reed contact to attract, connect the signal circuit, and send out an alarm signal; when a serious fault occurs inside the transformer, the pressure in the oil tank increases instantly, and there will be an oil surge, which will impact the baffle. When the baffle rotates to a certain limited position, the magnet on it makes The reed contact is energized to connect the tripping circuit, and the transformer power supply is directly cut off without prior alarm, thereby protecting the transformer; the operation and maintenance personnel will regularly observe the status of the inner core 2 inside the shell 1 through the observation window 12, such as observing the oil level inside the shell 1, the status of the float, some subtle displacement changes of the double floats on the inner core 2, the contact status of the reed contact, etc.; during the observation period, one of the windows of the observation window 12 can be illuminated by light, and the operation and maintenance personnel will observe in the other observation window 12. During the observation process, the round cover 33 is rotated, and the inner core 2 is driven to rotate during the rotation of the round cover 33, thereby changing the position of the parts on the inner core 2 close to the observation window 12, so that the operation and maintenance personnel can observe without blind spots. The air pipes on the gas assembly 32 are flexible and deformable, so they can rotate with the rotation of the round cover 33 without affecting the rotation of the round cover 33; the housing 1 in the relay serves as the outer shell of the gas relay, which protects the internal structure. It is usually made of metal and has good sealing and mechanical strength, and can withstand the influence of the oil pressure inside the transformer and external environmental factors; the junction box 31 in the relay is used to connect the external circuit to realize the signal transmission between the gas relay and the monitoring system. It contains electrical connection components to ensure the stability and reliability of signal transmission, and at the same time has certain protection performance to prevent interference from external factors; the observation window 12 in the relay: It is generally made of transparent material and installed on the housing 1, which is convenient for operation and maintenance personnel to operate without disassembling the equipment In the case of equipment failure, visually observe the internal oil level, float status, etc., so as to preliminarily judge the equipment operation status; exhaust device in relay: used to discharge the gas generated by the fault inside the transformer to ensure the normal operation of the gas relay. It is usually designed with a specific valve structure, which can automatically open the exhaust when the gas accumulates to a certain extent, and ensure good sealing after exhaust; the inner core 2 in the relay is the core component, which includes a double float, a reed contact and a digital sensor; the double float is a component that directly senses the change of oil level, and triggers the action of the reed contact by its up and down floating; the reed contact is used as a signal conversion element to convert the mechanical action of the float into an electrical signal; the digital sensor is responsible for collecting and processing various data information to realize the intelligent monitoring function; The present invention drives the inner core 2 to rotate by rotating the round cover 33, so that the operation and maintenance personnel can observe the status of the internal components more comprehensively without blind spots, and timely discover the slight displacement of the float, abnormal contact of the reed contact, etc., which helps to accurately determine the cause and location of the fault, improve the efficiency and accuracy of fault detection, and provide strong support for timely repair of equipment.

[0025] Embodiment 2: The center of the round cover 33 is directly below and located at the lower end of the inner core 2, and is fixedly connected to the card seat 21; the lower surface of the card seat 21 is fixedly connected to a square card block 22; the lower end of the card block 22 is conical; a bottom hole 13 is provided through the center of the bottom wall of the shell 1 from top to bottom; the bottom hole 13 is rotatably and sealedly connected to the chassis 4; the upper surface of the chassis 4 is provided with a square card slot 41 aligned with the card block 22; the card block 22 can be inserted into the card slot 41; the lower surface of the chassis 4 is elastically slidably connected to the locking rod 51 up and down; the locking rod 51 is laterally fixedly connected to the locking plate 52 at the lower end; the lower surface of the shell 1 is evenly provided with locking blocks 14 around the bottom hole 13; the end of the locking plate 52 is inserted into the gap between adjacent locking blocks 14 under the pull of elastic force.

[0026] In this embodiment, the lower surface of the chassis 4 protrudes a lower end of the bottom hole 13 ; the locking piece 52 is U-shaped; and a shifting gap 53 is formed between the upper edge of the locking piece 52 and the outer bottom wall of the shell 1 .

[0027] After the inner core 2 is connected to the round cover 33 in the upper cover 3, the inner core 2 on the lower surface of the upper cover 3 is inserted into the inner side of the shell 1, and the inner core 2 will drive the card seat 21 and the card block 22 to approach the card slot 41. The cross sections of the card slot 41 and the card block 22 are both square. The card block 22 is smoothly inserted into the card slot 41 under the guidance of the cone end of the card block 22 at the lower end, completing the connection between the card block 22 and the card slot 41. Then, the frame cover 34 is rotated to align the mounting hole on the frame cover 34 with the mounting hole on the upper port of the shell 1. The frame cover 34 is sealed and connected to the upper port of the shell 1 by bolts 36. Then, after the two symmetrical flanges 11 in the relay are connected and installed, the lock plate 52 is grabbed from the toggle gap 53 and moved downward. Due to the formation of the toggle gap 53, the lock plate 52 is better to be toggled. After being toggled, the lock plate 52 will move downward, and the end of the lock plate 52 moves out from the gap between the adjacent lock blocks 14 as the lock plate 52 moves downward, so that the lock plate 52 and the lock rod 51 are unlocked. When the locking rod 51 is unlocked, the chassis 4 will be unlocked. After the chassis 4 is unlocked, it can rotate with the rotation of the locking plate 52. During the rotation of the chassis 4, the slot 41 on the upper surface will be driven to rotate. During the rotation of the slot 41, the block 22 will be driven to rotate. During the rotation of the block 22, the holder 21 and the inner core 2 will be driven to rotate. During the rotation of the inner core 2, the round cover 33 in the upper cover 3 will be driven to rotate. During the rotation of the round cover 33, the junction box 31 and the exhaust component 32 will be driven to rotate, thereby changing the wiring position of the junction box 31 and the pipe connection direction of the exhaust component 32, thereby meeting a variety of installation environments and improving the application range of the relay. After completing the wiring or connection direction adjustment of the junction box 31 and the exhaust component 32, release the locking plate 52, the locking plate 52 and the locking rod 51 will move upward under the push of the elastic force, and the end of the locking plate 52 will be re-locked after the locking plate 52 moves upward The locking piece 52 is inserted into the gap of the corresponding locking block 14 to lock the locking piece 52 and the chassis 4, so that the inner core 2, the round cover 33, the terminal box 31 and the exhaust component 32 cannot rotate, thereby ensuring the working stability of the inner core 2, the terminal box 31 and the exhaust component 32; when the operation and maintenance personnel observe the inner core 2 through the observation window 12, the operation and maintenance personnel will move the locking piece 52 downward, and the end of the locking piece 52 will move out of the gap of the locking block 14 as the locking piece 52 moves downward, so that the chassis 4 can be rotated after being unlocked, and the rotation of the chassis 4 will drive the inner core 2 to rotate in the shell 1, so that all parts of the inner core 2 can be observed through the observation window 12 without blind spots. After the inspection of the inner core 2 is completed, loosening the locking piece 52 will cause the locking piece 52 to move upward under the action of elastic force. After the locking piece 52 moves upward, the chassis 4 and the inner core 2 will be locked and cannot rotate, so that the inner core 2 will not rotate during the operation. In this embodiment, the end of the locking plate 52 is inserted into the gap of the corresponding locking block 14 as the locking plate 52 moves upward, so that the inner core 2 that has completed the rotation cannot be rotated after being locked. On the one hand, the connection direction of the terminal box 31 and the exhaust component 32 can be changed. On the other hand, the inner core 2 that has completed the rotation is more stable during the operation, and the stability of use is improved.

[0028] Embodiment 3: A square groove 42 is provided inside the chassis 4 and directly below the card slot 41; the square groove 42 is slidably and sealedly connected to a square plate 5 in an up-and-down manner; the lower surface of the square plate 5 is connected to the lower inner wall of the square groove 42 through a first spring 54; the square plate 5 divides the square groove 42 into an upper cavity 43 and a lower cavity 44; the upper end of the locking rod 51 is fixedly connected to the lower surface of the square plate 5; the lower end of the locking rod 51 passes through the chassis 4 and extends to the bottom of the chassis 4; the locking rod 51 is slidably and sealedly connected to the chassis 4; the upper cavity 43 is connected to the inner side of the shell 1; The first spring 54 is sleeved on the outer wall of the locking rod 51; the inner edge of the observation window 12 is fixedly connected to the transparent lens 15; the outer side of the observation window 12 is hinged to the window door 6 through a torsion spring 61; the outer wall of the observation window 12 is blocked by the window door 6 and is provided with a push groove 16 near the torsion spring 61; the push block 7 is connected to the push groove 16 in a sliding seal; the outer wall of the chassis 4 is provided with a lower annular groove 45; the bottom of the lower annular groove 45 is connected to the lower cavity 44; the bottom of the push groove 16 is connected to the lower annular groove 45 through the first liquid hole 161; the lower cavity 44 is filled with liquid medium.

[0029] In this embodiment, an extension groove 71 is provided on the lower surface of the push block 7; the extension groove 71 is slidingly sealed and connected to the extension block 72; the extension block 72 is provided with a guide surface 73 at one end away from the bottom of the extension groove 71 and inclined toward the center of the shell 1; the bottom of the extension groove 71 is connected to the end of the push block 7 close to the bottom of the push groove 16 through a second liquid hole 74.

[0030] In this embodiment, the push block 7 is connected to the bottom of the push slot 16 through a first tension spring 75; the extension block 72 is connected to the bottom of the extension slot 71 through a second tension spring 76; the tension of the first tension spring 75 is smaller than the tension of the second tension spring 76.

[0031] When it is necessary to control the inner core 2 and the round cover 33 to be unlocked and rotated, the operation and maintenance personnel will move the locking plate 52 downward. During the downward movement of the locking plate 52, the locking rod 51 will be driven downward. During the downward movement of the locking rod 51, the square plate 5 will slide and move downward in the square groove 42. During the downward movement of the square plate 5, the elastic force of the first spring 54 needs to be overcome. During the downward movement of the square plate 5, the space in the upper cavity 43 will become larger, and the space in the lower cavity 44 will become smaller. The liquid medium in the lower cavity 44 will be pressurized and will enter along the lower annular groove 45 and the first liquid hole 161 to In the push groove 16, when the liquid medium in the push groove 16 increases, it will enter the extension groove 71 along the second liquid hole 74. Since the tension of the first tension spring 75 is less than the tension of the second tension spring 76, the push block 7 is pushed first before the extension block 72 extends out of the extension groove 71. The push block 7 will slide along the groove wall of the push groove 16 while moving away from the groove bottom of the push groove 16. When the push block 7 extends out of the push groove 16, it will push the window door 6. When the window door 6 is pushed, it will overcome the torsion of the torsion spring 61 and flip over, so that the window door 6 of the observation window 12 will be gradually pushed open. The push block 7 is in a sealing connection with the push groove 16, and the two can slide but will not be disconnected. The extension groove 71 is in a sealing connection with the extension block 72, and the two can slide but will not be disconnected. When the push block 7 extends out of the push groove 16 to the extreme position, the extension block 72 will slide along the extension groove 71 and move away from the bottom of the extension groove 71. The extension block 72 will extend out of the extension groove 71 and push the window door 6. After the window door 6 is pushed, it will be further opened. In the case where the extension block 72 is not provided, the push groove 16 needs to be closer to the position of the torsion spring 61 to fully open the window door 6. According to the lever principle, the closer to the position of the torsion spring 61, the more the push groove 16 is, the smaller the push groove 16 is. The greater the resistance of the push block 7 in pushing the window door 6, the greater the resistance of the lock plate 52 to move downward. In order to reduce the resistance of the lock plate 52 to move downward, an extension block 72 is provided, so that the window door 6 is opened in two sections, so that the force required to open the window door 6 is smaller, which better meets the use requirements. After the lock plate 52 moves downward, on the one hand, the chassis 4 is unlocked, and on the other hand, the window door 6 on the two observation windows 12 is opened automatically. Then, the lock plate 52 is rotated to drive the lock rod 51 to rotate. During the rotation of the lock rod 51, the square plate 5 is driven to rotate. During the rotation of the square plate 5, the chassis 4 is driven to rotate. During the rotation of the chassis 4, the card block 22 in the card slot 41 is driven to rotate. The rotation of the card block 22 drives the card seat 21 and the inner core 2 to rotate. In this way, the inner core 2 inside can be observed to be rotating through the lens 15 in the observation window 12, so that the inner core 2 can be observed without blind spots. After the observation of the inner core 2 is completed, the locking piece 52 is released, and the first spring 54 will push the square plate 5 to move upward. During the upward movement of the square plate 5, the locking rod 51 will be driven upward. During the upward movement of the locking rod 51, the locking piece 52 will be driven upward. The end of the locking piece 52 will be stuck in the gap of the locking block 14, completing the locking of the locking piece 52, so that the chassis 4 cannot drive the inner core 2 to rotate after being locked. After the square plate 5 moves upward, the space in the lower cavity 44 becomes larger to form a negative pressure, and the liquid in the extension groove 71 will enter the push groove 16. The medium in the push groove 16 will flow back into the lower cavity 44, and the extension block 72 will retract and extend. In the extension groove 71, the push block 7 will retract into the push groove 16, and the window door 6 will flip back to its original position due to the torsion force of the torsion spring 61 without the extension block 72 and the push of the push block 7, so that the observation window 12 is covered by the window door 6 again; in this embodiment, the square plate 5 is driven downward in the square groove 42 by the locking piece 52, so that the window door 6 will flip open on the observation window 12 while the inner core 2 is unlocked and rotated. In addition, in the process of loosening the locking piece 52, the window door 6 will automatically block the observation window 12 while the inner core 2 is rotated and locked, thereby facilitating the observation of the operation and maintenance personnel while improving the stability of the relay.

[0032] Embodiment 4: An upper annular groove 46 is provided on the outer wall of the chassis 4; the air outlet pipe 17 is fixedly connected to the upper position of the inner wall of the shell 1; the air outlet pipe 17 is located directly above the lens 15 and faces the lens 15; a first air hole 171 is provided inside the shell 1; one end of the first air hole 171 is connected to the air outlet pipe 17, and the other end is connected to the upper annular groove 46; the upper annular groove 46 is connected to the upper cavity 43.

[0033] When the operation and maintenance personnel find that there are impurities such as dirt on the inner side of the lens 15 that block the line of sight, they control the locking plate 52 to move up and down in a circular motion. During the up and down movement of the locking plate 52, the locking rod 51 and the square plate 5 will be driven to move back and forth up and down. The volume of the upper chamber 43 will change during the up and down movement of the square plate 5 in the square groove 42. During the downward movement of the square plate 5, the volume of the upper chamber 43 will increase to form a negative pressure. The air outlet pipe 17 will suck in the gas medium or liquid medium at the upper position of the inner side of the shell 1, and the medium will enter the upper chamber 43 along the first air hole 171. As the square plate 5 moves upward, the medium in the upper chamber 43 is pressurized and discharged along the liquid hole and the air outlet pipe 17. The air outlet pipe 17 faces the inner wall of the lens 15, thereby impacting the impurities attached to the inner wall of the lens 15, so that the inner wall of the lens 15 is cleaned to meet the observation requirements. The cleaned dirt will be deposited on the inner bottom wall of the shell 1.

[0034] Embodiment 5: The inner wall of the slot 41 is movably connected to the anti-blocking block 8 ; the anti-blocking block 8 is connected to the bottom of the slot 41 via a second spring 81 .

[0035] In this embodiment, the anti-blocking block 8 is provided with a one-way air outlet 82 running through the top and bottom; the bottom of the slot 41 is connected to the upper cavity 43 through a one-way air inlet 47; and the anti-blocking block 8 is slidably and sealingly connected to the inner wall of the slot 41.

[0036] When the maintenance personnel pull out the faulty inner core 2 from the shell 1, the block 22 will move out of the slot 41, and the anti-blocking block 8 will move up and down as the second spring 81 pushes it, so that the upper surface of the anti-blocking block 8 is flush with the upper surface of the chassis 4, thereby preventing impurities on the bottom wall of the shell 1 from entering the slot 41 after long-term use, causing the block 22 to enter the slot 41 for the second time and block it. In the process of the anti-blocking block 8 moving away from the bottom of the slot 41, the medium in the upper cavity 43 will enter the slot 41 along the one-way air inlet 47; after the inner core 2 completes the maintenance and drives the block 22 to enter the slot 41 again, the block 22 will push the anti-blocking block 8 into the slot 41, and the anti-blocking block 8 will squeeze the medium in the slot 41, so that the medium in the slot 41 is discharged along the one-way air outlet 82, so that the impurities are washed away from the upper end of the slot 41, to ensure that the block 22 can smoothly enter the slot 41 for the second time.

[0037] Embodiment 6: The aperture of the first liquid hole 161 near the lower chamber 44 is larger than the aperture of the first liquid hole 161 near the push groove 16. By limiting the aperture of the first liquid hole 161, the medium in the lower chamber 44 can quickly enter the push groove 16 along the first liquid hole 161 and push the push block 7, and when the push block 7 retracts into the push groove 16, the medium slowly flows back into the lower chamber 44 along the first liquid hole 161, so that the window door 6 is slowly closed to avoid the window door 6 closing too quickly and causing collision damage with the observation window 12.

[0038] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A digital gas relay based on a double-float structure, comprising a housing and an inner core inside the housing; the arc-shaped outer wall of the housing is symmetrically fixed with a flange and an observation window; the upper port of the housing is covered with an upper cover; the inner core is fixedly connected to the lower surface of the upper cover; the upper surface of the upper cover is fixedly connected to a junction box and an exhaust assembly; the characteristics are: The upper cover is composed of a round cover and a frame cover; a cover hole is arranged at the center of the frame cover; the round cover is rotatably and sealedly connected in the cover hole; the junction box, the exhaust assembly and the inner core are all connected to the round cover; the frame cover is connected to the upper port of the shell by bolts.

2. The digital gas relay based on the double float structure according to claim 1 is characterized in that: A card holder is fixedly connected to the bottom end of the inner core and just below the center of the round cover; a square card block is fixedly connected to the bottom surface of the card holder; a bottom hole is set through the center of the bottom wall of the shell; the bottom hole is rotatably sealed and connected to the chassis; a square card groove is set on the upper surface of the chassis and is aligned with the card block; a locking rod is elastically slidably connected to the lower surface of the chassis; the locking rod is laterally fixedly connected to a locking plate at the lower end; locking blocks are evenly arranged around the bottom hole on the lower surface of the shell; the end of the locking plate is stuck in the gap between adjacent locking blocks under the pull of elastic force.

3. The digital gas relay based on the double float structure according to claim 2 is characterized in that: The bottom surface of the chassis protrudes a lower port of the bottom hole; the locking piece is U-shaped; and a toggle gap is formed between the upper edge of the locking piece and the outer bottom wall of the shell.

4. The digital gas relay based on the double float structure according to claim 2 is characterized in that: A square groove is arranged inside the chassis and directly below the card slot; a square plate is elastically and sealably connected up and down in the square groove; the square plate divides the square groove into an upper cavity and a lower cavity; the upper end of the locking rod is fixedly connected to the lower surface of the square plate; the lower end of the locking rod passes through the chassis and extends to the bottom of the chassis; the locking rod is slidingly and sealably connected to the chassis; the upper cavity is connected to the inner side of the shell; the inner edge of the observation window is fixedly connected to a transparent lens; the lower position of the outer side of the observation window is hinged to the window door through a torsion spring; a push groove is arranged at a position on the outer wall of the observation window that is blocked by the window door and close to the torsion spring; a push block is slidingly and sealably connected in the push groove; a lower ring groove is arranged on the outer wall of the chassis; the bottom of the lower ring groove is connected to the lower cavity; the bottom of the push groove is connected to the lower ring groove through the first liquid hole.

5. The digital gas relay based on the double float structure according to claim 4 is characterized in that: An extension groove is arranged on the lower surface of the push block; the extension groove is slidingly sealed and connected to the extension block; the bottom of the extension groove is connected to an end of the push block close to the bottom of the push groove through a second liquid hole.

6. The digital gas relay based on the double float structure according to claim 5 is characterized in that: The push block is connected to the bottom of the push slot via a first tension spring; the extension block is connected to the bottom of the extension slot via a second tension spring; and the tension force of the first tension spring obtained is smaller than the tension force of the second tension spring.

7. The digital gas relay based on the double float structure according to claim 4 is characterized in that: An upper annular groove is arranged on the outer wall of the chassis; an air outlet pipe is fixedly connected to the upper position of the inner wall of the shell; the air outlet pipe is located directly above the lens and faces the lens; a first air hole is arranged inside the shell; one end of the first air hole is connected to the air outlet pipe, and the other end is connected to the upper annular groove; the upper annular groove is connected to the upper cavity.

8. The digital gas relay based on the double float structure according to claim 2 is characterized in that: The inner wall of the card slot is movably connected to the anti-blocking block; the anti-blocking block is connected to the bottom of the card slot via a second spring.

9. The digital gas relay based on the double float structure according to claim 8 is characterized in that: The anti-blocking block is provided with a one-way air outlet hole running through the top and bottom; the bottom of the card slot is connected with the upper cavity through a one-way air inlet hole; the anti-blocking block is slidably and sealedly connected with the inner wall of the card slot.

10. The digital gas relay based on the double float structure according to claim 4 is characterized in that: The aperture of the first liquid hole at one end close to the lower cavity is larger than the aperture of the first liquid hole at one end close to the push groove.

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