Sulfur hexafluoride gas density relay based on double bellows

Abstract

This invention provides a sulfur hexafluoride gas density relay based on a double-bellows system. The relay includes: a mechanical assembly comprising a front housing, a device connection connector, a dial, a display pointer, a vent pipe, a core assembly, and a pressure regulating mechanism; the device connection connector is connected to the measured sulfur hexafluoride gas chamber; the vent pipe is connected to the core assembly; the double-bellows assembly within the core assembly includes a main bellows, a secondary bellows, a chassis, a sleeve, and a push rod, with one end of the double-bellows assembly fixedly connected to the chassis and the other end connected to the membrane bonding mechanism via the push rod; a bracket is fixed to the chassis, and a microswitch is mounted on the bracket; one end of a meshing spring is fixed to the chassis, and the other end pulls a lever, with a support plate fixedly connected to the lever; a pressure and temperature integrated sensor in the remote transmission electronic assembly is connected to the double-bellows assembly, and a remote transmission circuit board is used for data transmission. This invention achieves higher precision adjustment, improves the accuracy of the density relay, and enables more refined and reliable monitoring.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and more particularly to a sulfur hexafluoride gas density relay based on a double-bellows. Background Technology

[0002] With the increasing demands of power grids for smart grids and smart substations, and the development of unmanned substations towards networking and digitalization, online monitoring of the gas density status of SF6 electrical equipment has become increasingly common. Current gas density monitoring systems (gas density relays) widely employ intelligent SF6 gas density relays to collect and upload data on density, pressure, and temperature, achieving online gas density monitoring. Therefore, selecting a reliable remote-transmission density relay is particularly important.

[0003] However, currently used intelligent SF6 gas density relays employ a single Baden tube as the pressure sensing element and a bimetallic temperature compensation element, simultaneously driving a microswitch and displaying a pointer. The advantage is excellent synchronization between the pointer display and the measured gas density and pressure. However, this also has limitations and shortcomings: low calibration accuracy and insufficient vibration resistance to meet the requirements of electrical equipment in practical applications. When the electrical equipment closes, the strong vibration of the switching equipment can easily cause malfunctions and false alarms. Summary of the Invention

[0004] In view of the problems existing in the prior art, the main objective of the present invention is to provide a sulfur hexafluoride gas density relay based on a double bellows, thereby improving the accuracy and reliability of the sulfur hexafluoride gas density relay.

[0005] To achieve the above objectives, embodiments of the present invention provide a sulfur hexafluoride gas density relay based on a double bellows, the relay comprising: a mechanical component and a remote transmission electronic component;

[0006] The mechanical components include a front housing, an equipment connection connector, a dial, a display pointer, a vent pipe, a dial core assembly, and a pressure regulating mechanism. The equipment connection connector, dial, display pointer, vent pipe, dial core assembly, and pressure regulating mechanism are housed within the front housing. The equipment connection connector is connected to the chamber containing the sulfur hexafluoride gas being measured. The display pointer is located on the dial. The pressure regulating mechanism is connected to the vent pipe and the equipment connection connector. The vent pipe is connected to the dial core assembly.

[0007] The watch movement assembly includes a chassis, a double bellows assembly, a membrane bonding movement, a hinge, a connecting rod, a bracket, a meshing spring, a pull rod, a micro switch, and a support plate. The double bellows assembly includes a main bellows, a secondary bellows, a chassis, a sleeve, and a push rod. One end of the double bellows assembly is fixedly connected to the chassis, and the other end is connected to the membrane bonding movement via the push rod to drive the display pointer to rotate on the dial. The bracket is fixed to the chassis, and the micro switch is mounted on the bracket.

[0008] One end of the engagement spring is fixed to the chassis, and the other end pulls the tie rod. The support plate is fixedly connected to the tie rod. When the gas pressure of the gas being measured in the double bellows assembly increases or decreases, the top rod increases or decreases accordingly, driving the connecting rod to form a lever structure through the hinge seat.

[0009] The remote transmission electronic component includes a rear housing, an integrated pressure and temperature sensor, and a remote transmission circuit board; the integrated pressure and temperature sensor and the remote transmission circuit board are located inside the rear housing; the integrated pressure and temperature sensor is connected to the dual bellows assembly; the remote transmission circuit board is used for data transmission.

[0010] Optionally, in one embodiment of the present invention, the mechanical component further includes a front cover, a sealing gasket, and an instrument glass; wherein the instrument glass is disposed on the outside of the dial.

[0011] Optionally, in one embodiment of the present invention, the mechanical component further includes a tee connector, the three joints of which are respectively connected to the equipment connection connector, the pressure regulating mechanism and the vent pipe.

[0012] Optionally, in one embodiment of the present invention, the watch core assembly further includes an insulating pad disposed between the micro switch and the bracket.

[0013] Optionally, in one embodiment of the present invention, the watch core assembly further includes a locking nut, which is disposed at the upper end of the pull rod and is used to fix and lock the support plate to the pull rod.

[0014] Optionally, in one embodiment of the present invention, the watch core assembly further includes an adjusting screw for adjusting the gap between the support plate and the micro switch.

[0015] Optionally, in one embodiment of the present invention, the watch movement assembly further includes a base and a guide seat, the guide seat being disposed on the base and connected to the double bellows assembly.

[0016] Optionally, in one embodiment of the present invention, the watch movement assembly further includes a fixing screw for fixing the film-coated movement.

[0017] Optionally, in one embodiment of the present invention, the remote transmission electronic component further includes a signal sampling unit for receiving the action signal fed back by the micro switch.

[0018] Optionally, in one embodiment of the present invention, the remote transmission electronic component further includes an intelligent control unit, which is connected to the signal sampling unit, the pressure and temperature integrated sensor, and the remote transmission circuit board for data communication.

[0019] This invention uses a double bellows as a pressure measuring element to achieve a high vibration resistance structure. By applying the lever principle, the adjustment range of the control contacts is expanded, which can achieve higher precision adjustment, improve the accuracy of the density relay, and realize more precise and reliable monitoring of sulfur hexafluoride gas in electrical equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a sulfur hexafluoride gas density relay based on a double-bellows according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the watch core component structure in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the lever drive mechanism in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the overall structure of the sulfur hexafluoride gas density relay based on a double-bellows in an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the self-verification circuit in an embodiment of the present invention. Detailed Implementation

[0026] This invention provides a sulfur hexafluoride gas density relay based on a double-bellows.

[0027] The technical solutions of 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.

[0028] like Figure 1The diagram shows a schematic representation of a sulfur hexafluoride gas density relay based on a double-bellows system according to an embodiment of the present invention. This invention uses a double-bellows system as the pressure-sensing element to achieve a highly vibration-resistant structure. By employing the lever principle, the adjustment range of the control contacts is expanded, enabling higher precision adjustment and improving the accuracy of the density relay. This allows for more precise and reliable monitoring of sulfur hexafluoride gas within electrical equipment. The relay shown in the diagram includes: a mechanical component 1 and a remote electronic component 2.

[0029] Mechanical component 1 includes a front housing 101, an equipment connection connector 102, a dial 106, a display pointer 107, a vent pipe 108, a dial core assembly 109, and a pressure regulating mechanism 302. The equipment connection connector 102, dial 106, display pointer 107, vent pipe 108, dial core assembly 109, and pressure regulating mechanism 302 are housed within the front housing 101. The equipment connection connector 102 is connected to the chamber containing the sulfur hexafluoride gas being measured. The display pointer 107 is located on the dial 106. The pressure regulating mechanism 302 is connected to the vent pipe and the equipment connection connector 102. The vent pipe 108 is connected to the dial core assembly 109.

[0030] Among them, such as Figure 2 As shown, the watch movement assembly 109 includes a chassis 10901, a double bellows assembly 10902, a membrane bonding mechanism 10905, a hinge 10907, a connecting rod 10909, a bracket 10910, a meshing spring 10911, a pull rod 10912, a micro switch 10914, and a support plate 10915. The double bellows assembly 10902 includes a main bellows, a secondary bellows, a chassis, a sleeve, and a push rod 1090206. One end of the double bellows assembly 10902 is fixedly connected to its chassis, and the other end is connected to the membrane bonding mechanism 10905 via the push rod 1090206, thereby driving the display pointer 107 to rotate on the dial 106. The bracket 10910 is fixed to the chassis, and the micro switch 10914 is mounted on the bracket 10910.

[0031] One end of the engagement spring 10911 is fixed to the chassis of the double bellows assembly, and the other end pulls the pull rod 10912. The support plate 10915 is fixedly connected to the pull rod 10912. When the gas pressure of the gas being measured in the double bellows assembly 10902 increases or decreases, the top rod 1090206 increases or decreases accordingly, driving the connecting rod 10909 to form a lever structure through the hinge seat 10907.

[0032] The remote transmission electronic component 2 includes a rear housing 201, a pressure and temperature integrated sensor 203, and a remote transmission circuit board 204; wherein, the pressure and temperature integrated sensor 203 and the remote transmission circuit board 204 are disposed inside the rear housing; the pressure and temperature integrated sensor 203 is connected to the double bellows assembly 10902; and the remote transmission circuit board 204 is used for data transmission.

[0033] As an embodiment of the present invention, the mechanical component 1 further includes a front cover 103, a sealing gasket 105, and an instrument glass 104; wherein the instrument glass 104 is disposed on the outside of the dial 106.

[0034] As an embodiment of the present invention, the mechanical component also includes a three-way connector 301, the three joints of which are respectively connected to the equipment connection connector 102, the pressure regulating mechanism 302 and the vent pipe 108.

[0035] As an embodiment of the present invention, the watch core assembly 109 further includes an insulating pad 10913, which is disposed between the micro switch 10914 and the bracket 10910.

[0036] As an embodiment of the present invention, the watch core assembly 109 further includes a locking nut 10917, which is disposed on the upper end of the pull rod 10912 and is used to fix and lock the support plate 10915 to the pull rod 10912.

[0037] As an embodiment of the present invention, the watch core assembly 109 further includes an adjusting screw 10916, which is used to adjust the gap between the support plate 10915 and the micro switch 10914.

[0038] As an embodiment of the present invention, the watch movement assembly 109 further includes a base 10903 and a guide seat 10904. The guide seat 10904 is disposed on the base 10903 and is connected to the double bellows assembly 10902.

[0039] As an embodiment of the present invention, the watch movement assembly 109 further includes a fixing screw 10906, which is used to fix the film-bonded movement 10905.

[0040] As an embodiment of the present invention, the remote transmission electronic component 2 further includes a signal sampling unit 303 for receiving the action signal fed back by the micro switch 10914.

[0041] In this embodiment, the remote transmission electronic component also includes an intelligent control unit 304, which is connected to the signal sampling unit 303, the pressure and temperature integrated sensor 203, and the remote transmission circuit board 204 for data communication.

[0042] The high-vibration-resistant, high-precision, self-calibrating, remote-transmission sulfur hexafluoride gas density relay with double bellows in this invention uses double bellows as the pressure-sensing element to achieve a high vibration-resistant structure. By utilizing the lever principle, the adjustment range of the control contacts is expanded, enabling higher precision adjustment and improving the accuracy of the density relay. This allows for more precise monitoring of sulfur hexafluoride gas within electrical equipment. Furthermore, to achieve uninterrupted online automatic calibration, manual on-site calibration of the gas density relay is unnecessary, significantly reducing maintenance costs and ultimately achieving maintenance-free operation.

[0043] Furthermore, to achieve maintenance-free operation, the performance and accuracy of the density relay itself must be improved to ensure long-term reliable operation. Through technological innovation, the accuracy and vibration resistance of the density relay can be enhanced, and it can be equipped with a self-calibration function. This involves a smart control unit controlling the rise and fall of gas pressure in the pressure regulating mechanism, which in turn activates a microswitch via a lever mechanism, thus actuating the density relay contacts. After collecting and analyzing relevant data, the accuracy and qualification of the density relay can be determined, achieving high reliability and high intelligence, and providing safer and more convenient services to the power grid.

[0044] In a specific embodiment of the present invention, the dual-bellows high-vibration-resistant, high-precision self-calibrating remote-transmission sulfur hexafluoride gas density relay mainly consists of a mechanical part and an independent remote-transmission electronic part, namely, mechanical component 1 and remote-transmission electronic component 2. The mechanical part consists of a display function area and a contact signal control function area. The two function areas are driven by a bellows as a pressure-sensing element structure to drive a microswitch and a pointer display to realize the control and display functions. The display function can also be digital. The contact signal control function area uses a bellows component, which greatly improves the vibration resistance. At the same time, it uses the lever proportional amplification principle to amplify the contact signal control adjustment ratio, realize precise adjustment control, and improve the precision of contact signal control.

[0045] like Figure 1 As shown, the mechanical components 1 of this bellows-type high vibration-resistant, high-precision self-calibrating remote transmission sulfur hexafluoride gas density relay mainly include: a front housing 101, an equipment connection connector 102, a front cover 103, an instrument glass 104, a sealing gasket 105, a dial 106, a display pointer 107, a vent pipe 108, a core assembly 109, a tee connector 301, and a pressure regulating mechanism 302. The remote transmission electronic components 2 include: a pressure and temperature integrated sensor 203, a remote transmission circuit board 204, an online calibration contact signal sampling unit 303 (i.e., a signal sampling unit), and an intelligent control unit 304.

[0046] Among them, the relay in the present invention has a self-checking function. The intelligent control unit 304 controls the rise and fall of the gas pressure of the pressure regulating mechanism 302, and the micro switch 10914 is actuated through the lever mechanism, that is, the contact of the density relay acts, so that the online checking contact signal sampling unit sends a signal to the intelligent control unit. Then the intelligent control unit collects the gas pressure and temperature values when the contact acts through the integrated pressure and temperature sensor, and automatically calculates and converts them into the pressure value corresponding to the gas at 20°C, that is, the density value. This density value is compared with the theoretical alarm and locking contact parameter values initially set by the density relay. If the difference meets the accuracy requirements of the density relay itself, it is qualified, otherwise it is unqualified. The checking conclusion is transmitted to the background monitoring system for display through the remote transmission function of the density relay.

[0047] Thereby, it is realized that the gas density monitoring of electrical equipment requires no manual maintenance, so that the density relay has high accuracy and vibration resistance, and the density relay has a self-checking function, that is, the density relay meets the requirements of high reliability, high accuracy and high intelligence, which guarantees the safe operation of the power grid and reduces the maintenance cost.

[0048] In this embodiment, as Figure 1 , Figure 2 and Figure 3 shown, the sulfur hexafluoride gas density relay of the present invention can be used for high-voltage electrical equipment, and is mainly composed of a mechanical component 1 and a remote transmission electronic component 2.

[0049] Among them, the mechanical component 1 uses a double bellows combination structure as a pressure measuring element structure to directly drive the pointer display part, and at the same time drives the contact control part through a link mechanism to achieve synchronous consistency between pointer display and contact signal control. Moreover, since the double bellows structure can greatly improve vibration resistance, and the contact adjustment of the control part is realized through the transmission of the link structure, which greatly improves the accuracy and precision.

[0050] Specifically, Figure 1 the mechanical component 1 includes: a front case 101, an equipment connection joint 102, a front cover 103, an instrument glass 104, a sealing gasket 105, a dial 106, a display pointer 107, a vent pipe 108, a movement core assembly 109, a three-way joint 301 and a pressure regulating mechanism 302.

[0051] Among them, Figure 2 the movement core assembly 109 includes: a base plate 10901, a double bellows assembly 10902, a base 10903, a guide seat 10904, a diaphragm movement 10905, a fixing screw 10906, a hinged seat 10907, a pin shaft 10908, a connecting rod 10909, a support 10910, an engaging spring 10911, a pull rod 10912, an insulating pad 10913, a micro switch 10914, a support plate 10915, an adjusting screw 10916, and a lock nut 10917.

[0052] Furthermore, Figure 3 As shown, the double-bellows assembly 10902 consists of a chassis, sleeve, main bellows, secondary bellows, cover plate, and top rod 1090206. Among them, Figure 3 (a) in the text represents a decrease in gas pressure (leakage). Figure 3 (b) in the figure represents the rated air pressure condition. Figure 3 (c) in the text represents an increase in gas pressure (inflation).

[0053] Furthermore, Figure 1 The electronic component 2 includes: a rear housing 201, a rear cover 202, a pressure and temperature integrated sensor 203, a remote transmission circuit board 204, an online verification contact signal sampling unit 303, and an intelligent control unit 304. The pressure and temperature integrated sensor 203 is fixed inside the rear housing 201 and is connected to the pressure measuring element double bellows assembly 10902 in the gas path.

[0054] Specifically, the mechanical front case 101 and the electronic rear case 201 are independent or separated from each other. One end of the pressure-sensing element double bellows assembly 10902 is fixed to the chassis 10901, and the other end is connected to the membrane movement 10905 through the push rod 1090206, thereby driving the display pointer 107 to rotate on the dial 106 to realize the display function.

[0055] Furthermore, the bracket 10910 is fixed to the chassis 10901, and the micro switch 10914 is mounted on the bracket 10910. An insulating pad 10913 is used for insulation between them. One end of the engagement spring 10911 is fixed to the chassis 10901, and the other end pulls the pull rod 10912. The upper end of the pull rod 10912 is fixed and locked to the support plate 10915 with the pull rod 10912 using a locking nut 10917. An adjusting screw 10916 is installed on the support plate 10915 to adjust the gap with the micro switch 10914. When the gas pressure of the measured gas in the double bellows assembly 10902 increases or decreases, the push rod 1090206 will also increase or decrease accordingly, driving the connecting rod 10909 to form a lever structure through the fixed point hinge 10907. Based on the lever principle, the connecting end of the connecting rod 10909 and the pull rod 10912 will generate opposite lowering or raising movements. The lowering or raising movement of the pull rod 10912 will drive the support plate 10915 and the adjusting screw 10916 to move in the same direction, triggering or disengaging the micro switch 10914 to form an on or off electrical signal, thereby realizing the control function.

[0056] Specifically, the working principle and process of the sulfur hexafluoride gas density relay in this invention are as follows: The density relay is connected to the sulfur hexafluoride gas chamber to be measured through the equipment connection connector 102. The sulfur hexafluoride gas enters the first interface of the three-way connector 301 through the gas pipe, enters the chassis 10901 through the third interface of the three-way connector 301 through the vent pipe 108, and then enters the main bellows. The main bellows, the secondary bellows, and the sleeve together form a sealed cavity. The sealed cavity is filled with sulfur hexafluoride gas at a constant temperature of 20°C as a relative compensation cavity. The filling pressure is calculated based on the rated filling pressure of the sulfur hexafluoride gas in the electrical equipment being measured.

[0057] When the temperature changes, the sulfur hexafluoride (SF6) gas pressure inside the electrical equipment being measured increases or decreases with the temperature. That is, the SF6 gas pressure inside the main bellows increases or decreases, and the SF6 gas pressure inside the sealed cavity formed by the main and secondary bellows and the sleeve also increases or decreases in the same way. This keeps the main and secondary bellows in a relatively balanced position. The measured SF6 gas pressure is always reflected with reference to the 20°C SF6 gas sealed in the relative compensation cavity, thus offsetting the influence of external temperature changes on the SF6 gas pressure inside the measured electrical equipment and achieving the temperature compensation function.

[0058] When the pressure of sulfur hexafluoride gas inside the tested electrical equipment decreases, i.e., the pressure of sulfur hexafluoride gas inside the main bellows decreases, the internal and external pressures become unbalanced, causing the main bellows to compress downwards, which in turn causes the push rod 1090206 to move downwards. At the same time, the connection point between the connecting rod 10909 and the push rod 1090206 moves downwards, while the connection point between the connecting rod 10909 and the pull rod 10912 moves upwards. The upward movement of the pull rod 10912 causes the support plate 10915 and the adjusting screw 10916 to move upwards, causing the adjusting screw 10916 to disengage from the micro switch 10914, thus generating an alarm or lockout electrical signal.

[0059] Conversely, when the sulfur hexafluoride gas inside the electrical equipment is charged to the rated pressure, the pressure of the sulfur hexafluoride gas inside the main bellows increases, restoring pressure balance. The main bellows stretches upward, causing the push rod 1090206 to move upward. At the same time, the connection point between the connecting rod 10909 and the push rod 1090206 moves upward, while the connection point between the connecting rod 10909 and the pull rod 10912 moves downward. The downward movement of the pull rod 10912 causes the support plate 10915 and the adjusting screw 10916 to move downward, causing the adjusting screw 10916 to trigger the micro switch 10914 to release the alarm or lock the electrical signal, thus realizing the control function.

[0060] On the other hand, the increase or decrease in the pressure of the sulfur hexafluoride gas being measured inside the main bellows causes the push rod 1090206 to move up and down. At the same time, the push rod 1090206 will push the membrane bonding mechanism 10905 to fluctuate up and down. The membrane bonding mechanism 10905 converts the up and down fluctuation displacement into circumferential rotation, which drives the display pointer 107 to rotate on the scale 106, displaying the pressure value of the corresponding sulfur hexafluoride gas at 20°C, thus realizing the display function.

[0061] In this embodiment, the working principle and process of the high vibration resistance and high precision technology are as follows: the high vibration resistance technology is as follows: Figure 3 As shown, the pressure measuring principle structure used in this invention is a double-bellows relative cavity structure. The inner cavity of the main bellows is the chamber for the measured sulfur hexafluoride gas (hereinafter referred to as the measured gas chamber). The outer cavity of the main bellows, the secondary bellows, and the sleeve form a sealed cavity, which is the relative compensation cavity (hereinafter referred to as the reference gas chamber). During operation, both the measured gas chamber and the reference gas chamber are filled with sulfur hexafluoride gas. The pressure balance between the inner and outer cavities effectively ensures the stability of the push rod 1090206. Even under strong vibration and impact during the opening and closing of electrical equipment, stability is still guaranteed, avoiding false alarms and malfunctions of the density relay. Compared with density relays using Baden tubes as pressure measuring elements, the vibration resistance of the double-bellows structure of this invention far exceeds that of density relays using Baden tube structures.

[0062] Furthermore, ultra-high precision technologies such as Figure 4 As shown, using the lever proportional amplification principle, the distance between the connection point of hinge 10907 and top rod 1090206 is set as L1, and the distance between the connection point of hinge 10907 and pull rod 10912 is set as L2. According to the lever principle, when top rod 1090206 rises or falls by a height of H1, pull rod 10912 falls or rises in the opposite direction by H2, and H1:H2=L1:L2. Therefore, H2=L2 / L1*H1. For a conventional relative cavity bellows structure density relay, if the control contact is adjusted by installing a micro switch on top rod 1090206, assuming that the control contact needs to be adjusted to level 1.0, then level 1.0 control needs to be achieved through the height of the adjustable range H1. This invention employs a lever ratio amplification principle, expanding the adjustable range to H2 = L2 / L1*H1. The height range of H2 = L2 / L1*H1 easily achieves a precision requirement of 1.0 level. Taking L1:L2 = 1:2, then H2 = 2H1. Since the height of H1 can be adjusted to a 1.0 level, the height of 2H1 can achieve a precision of 0.5 level. Therefore, the larger the L1:L2 ratio is set, the higher and more precise the adjustable precision level.

[0063] Further, the fixed point of the lever structure of the present invention is a hinge seat 10907. When the lever rotates around the center point of the hinge seat, the movement tracks of both ends of the lever are circular tracks with the center point of the hinge seat as the center of circle, which will cause horizontal displacement of the ejector rod 1090206 and the pull rod 10912. In order to convert the circular track of the connecting points at the two rotating ends of the lever into vertical displacement of the ejector rod 1090206 and the pull rod 10912, an oblong long hole with horizontal guiding function is designed at the connection of the ejector rod 1090206 and the pull rod 10912, which effectively solves the problem of the movement track of the lever, thereby realizing the ultra-high precision technology of the density relay.

[0064] In this embodiment, the working principle and process of the self-checking function technology of the present invention are as follows: the device connecting joint 102 is connected to the first interface of the three-way joint 301 through an air pipe; the air path of the pressure regulating mechanism 302 is connected to the second interface of the three-way joint 301, and the third interface of the three-way joint 301 is connected to the chassis 10901 through the vent pipe 108, and the air path leads to the inside of the main corrugated pipe. When the background system issues a calibration command, the intelligent control unit 304 transmits the command to the pressure regulating mechanism 302, and the pressure regulating mechanism 302 acts to perform a pressure reduction operation, so that the pressure of the gas entering the main corrugated pipe from the third interface of the three-way joint 301 is reduced, and the micro switch 10914 is actuated through the lever mechanism, that is, the contact of the density relay actuates, and the actuation signal of the micro switch 10914 is fed back to the on-line calibration contact signal sampling unit 303. The on-line calibration contact signal sampling unit 303 sends a signal to the intelligent control unit 304, and then the intelligent control unit 304 collects the gas pressure and temperature values in the main corrugated pipe when the contact actuates from the integrated pressure and temperature sensor 203, and automatically calculates and converts them into the pressure value corresponding to 20°C gas, and compares the calculated pressure value corresponding to 20°C gas with the theoretical alarm and blocking contact parameter values initially set by the density relay. If the difference meets the accuracy requirement of the density relay itself, it is qualified; otherwise, it is unqualified. The calibration conclusion is transmitted to the background monitoring system for display through the remote transmission function of the density relay.

[0065] After the calibration is completed, the intelligent control unit 304 transmits an end command to the pressure regulating mechanism 302, the pressure regulating mechanism 302 stops acting, so that the gas pressure entering the main corrugated pipe from the third interface of the three-way joint 301 is restored to be consistent with the pressure of the measured gas in the gas chamber of the electrical equipment. The micro switch 10914 is reset and released from action through the lever mechanism, that is, the density relay returns to normal operation, and the entire self-calibration process is completed.

[0066] In a specific embodiment of the present invention, as Figure 4 shown is a schematic overall structural diagram of a double-bellows high vibration-resistance high-precision self-checking remote-transmission sulfur hexafluoride gas density relay in an embodiment of the present invention.

[0067] The relay in this embodiment also has a digital display function, and its self-verification function further includes: [following the previous sentence about digital display functionality]. Figure 1 Compare the structural diagrams shown. Figure 4 The high-vibration-resistant, high-precision, self-calibrating, remote-transmission density relay with dual bellows shown has a digital display function and also includes: an external density relay adapter 3, a pressure regulating device 5, an electric control valve 4, a contact signal acquisition unit 6, an intelligent control unit 7, a multi-port connector 9, and an air inlet 10. The intelligent control unit 7 functions similarly to the intelligent control unit 304.

[0068] The multi-port connector 9 is installed on the electrical equipment connection connector 8. One end of the solenoid valve 4 is fixed to the electrical equipment connection connector 8, and the other end of the solenoid valve 4 is fixed to one end of the multi-port connector 9. The multi-port connector 9 connects to the gas path of the intelligent gas density relay body. The solenoid valve 4 can also be connected to the intelligent control unit 7 and opened or closed under the control of the intelligent control unit 7.

[0069] Furthermore, the pressure regulating device 5 can be connected to the intelligent gas density relay body via the multi-port connector 9. For example, the pressure regulating device 5 is fixed on the right port of the multi-port connector 9, and the pressure regulating device 5 is connected to the intelligent gas density relay body in the gas path.

[0070] Specifically, the pressure regulating device 5 is configured to regulate the rise and fall of the gas pressure of the intelligent gas density relay body, causing the intelligent gas density relay body to activate a contact signal; the upper end of the multi-port connector 9 is connected to the density relay adapter 3, and is fixedly connected to the density relay body through the density relay adapter 3. The lower end of the multi-port connector 9 is connected to the gas inlet 10.

[0071] The pressure regulating device 5 includes: a cavity with one open end, a piston 51 inside the cavity, a sealing ring 510 on the piston 51, an adjusting rod connected to one end of the piston 51, the outer end of the adjusting rod connected to a driving component 52, and the other end of the piston 51 extending into the opening and contacting the inner wall of the cavity. The driving component 52 drives the adjusting rod, thereby moving the piston 51 within the cavity. The driving component 52 includes, but is not limited to, one of the following: magnetic force, electric motor (variable frequency motor or stepper motor), reciprocating motion mechanism, Carnot cycle mechanism, or pneumatic component.

[0072] During normal operation, the solenoid valve 4 is in the open state, and the gas density relay monitors the gas density value inside the electrical equipment. At the same time, the gas density relay monitors the gas density value inside the electrical equipment online through the pressure and temperature integrated sensor 203 and the intelligent control unit 7.

[0073] Furthermore, the contact signal acquisition unit 6 is configured to acquire the contact signals of the gas density relay, and it is also connected to the intelligent control unit 7. The intelligent control unit 7 can be a microprocessor-based embedded system with embedded algorithms and control programs to automatically control the entire monitoring process, including all peripherals, logic, and input / output.

[0074] Among them, the dual-bellows high-vibration-resistant, high-precision self-calibrating remote-transmission density relay can convert the pressure and temperature values ​​measured by the integrated pressure and temperature sensor 203 into the corresponding pressure value P20 at 20℃ according to the gas characteristics through the intelligent control unit 7. That is, the gas density relay has pressure and temperature measurement and software conversion functions. The intelligent control unit 7 can measure both relative pressure and absolute pressure types of gas density relays.

[0075] Furthermore, the intelligent control unit 7 also has an interface that can complete test data storage, and / or test data export, and / or test data printing, and / or data communication with a host computer, and / or input analog and digital information. The pressure and temperature integrated sensor 203, the contact signal acquisition unit 6, and the intelligent control unit 7 are housed within the gas density relay body.

[0076] Furthermore, the dual-bellows high-vibration-resistant, high-precision self-calibrating remote-transmission density relay also features human-machine interaction: it has a data display interface that can refresh the current data value in real time; and a data input function that allows input of parameter settings. The electrical interface of the gas density relay can be equipped with protection functions, preventing damage to the interface if misconnected.

[0077] Furthermore, the intelligent control unit 7 and the intelligent control unit 304 can be implemented using general-purpose computers, industrial control computers, CPUs, microcontrollers, ARM chips, AI chips, quantum chips, photonic chips, MCUs, FPGAs, PLCs, industrial control motherboards, embedded main control boards, etc.

[0078] In this embodiment, as Figure 5 As shown, this gas density relay has a self-calibration function. The self-calibration working principle is as follows: based on the set calibration time and / or calibration command, and the gas density value, and under conditions where calibration of the gas density relay is permitted, the intelligent control unit 7 controls the electronic control valve 4 to close, thereby cutting off the gas path between the gas density relay and the electrical equipment. The intelligent control unit 7 directly or indirectly adjusts the contact signal acquisition unit 6 to the calibration state.

[0079] In the verification state, the contact signal acquisition unit 6 cuts off the control circuit of the gas density relay contact signal. That is, the intelligent control unit 7 controls the contact signal acquisition unit 6 to de-energize the control coil of the intermediate relay J1 of the contact signal acquisition unit 6, and its contacts J11 and J12 are disconnected. In this way, the contact signal of the gas density relay is disconnected from the control circuit of the contact signal, and at the same time, the contact PJ of the gas density relay is connected to the intelligent control unit 7.

[0080] Furthermore, the intelligent control unit 7 controls the pressure regulating device 5, and simultaneously connects to the contact sampling circuit of the gas density relay body. Then, the intelligent control unit 7 controls the drive component 52 of the pressure regulating mechanism 5 (which can be mainly implemented using a motor and gears, with various and flexible methods), thereby adjusting the piston 51 of the pressure regulating mechanism 5, causing a volume change in the sealed cavity composed of the piston 51, the gas density relay body, and the valve 4. The gas pressure in the gas density relay body 1 gradually decreases, causing the density relay to activate its contacts. This contact activation is uploaded to the intelligent control unit 7 via the online verification contact signal sampling unit 6.

[0081] Furthermore, the intelligent control unit 7 converts the pressure and temperature values ​​measured during contact operation into a pressure value P corresponding to 20°C according to the gas characteristics. 20 (Density value) can be used to detect the contact action value P of the gas density relay body. D20 After all the alarm and / or lockout signal contact action values ​​of the gas density relay body have been detected, the intelligent control unit 7 controls the motor (motor or variable frequency motor) of the pressure regulating mechanism 5 to adjust the piston 51 of the pressure regulating mechanism 5, so that the gas pressure in the gas density relay body gradually increases, and the return value of the alarm and / or lockout contact signal of the gas density relay body is tested. This verification is repeated many times (for example, 2 to 3 times), and then the average value is calculated. This completes the verification work of the gas density relay body.

[0082] Furthermore, after all contact signal verification is completed, the intelligent control unit 7 controls the electric control valve 4 to open, connecting the gas density relay with the gas circuit of the electrical equipment, and adjusting the contact signal acquisition unit 6 to the working state. At this time, the intelligent control unit 7 controls the contact signal acquisition unit 6 to energize the control coil of the intermediate relay J1 of the contact signal acquisition unit 6, and its contacts J11 and J12 close. In this way, the contact signal of the gas density relay is connected to the control circuit of the contact signal, and the control circuit of the contact signal of the gas density relay returns to normal operation.

[0083] In this embodiment, the intelligent control unit 7 controls the opening and closing of the electric control valve 4 of the gas density relay, ensuring that the gas density relay is communicated with the electrical equipment on the gas path in the working state, and the gas density relay can safely monitor the gas density of the electrical equipment, so that the electrical equipment can work safely and reliably.

[0084] Wherein, in the calibration state, the gas density relay is not communicated with the electrical equipment on the gas path, and on-line calibration of the gas density relay will not affect the safe operation of the electrical equipment. This embodiment can realize on-line calibration of the gas density relay, improves efficiency, reduces operation and maintenance costs, and at the same time realizes zero emission of SF6 gas in the whole calibration process, which meets the requirements of environmental protection regulations and is conducive to popularization and application.

[0085] The present invention makes innovations aiming at the requirements of high precision and high vibration resistance for intelligent and self-calibrating density relays: the mechanical part consists of a display functional area and a contact signal control functional area, the two functional areas use a double corrugated pipe as a pressure measuring element structure to drive a microswitch and a pointer display to realize the control function and the display function, and the display function can also be digital; the contact signal control functional area adopts a double corrugated pipe assembly, which greatly improves the vibration resistance. Meanwhile, the lever proportional amplification principle is adopted to amplify the contact signal control and regulation proportion, so as to realize precise regulation control and improve the contact signal control precision of the density relay.

[0086] The present invention also has a self-calibration function: the intelligent control unit / intelligent control unit controls the rise and fall of the gas pressure of the pressure regulating mechanism, so that the microswitch acts through the lever mechanism, that is, the contact of the density relay acts, so that the on-line calibration contact signal sampling unit sends a signal to the intelligent control unit, and then the intelligent control unit / intelligent control unit collects the gas pressure and temperature values when the contact acts through the integrated pressure and temperature sensor, and converts them into the pressure value corresponding to the gas at 20°C through self-calculation, that is, the density value; this density value is compared with the theoretical alarm and locking contact parameter values initially set by the density relay, if the difference meets the precision requirement of the density relay itself, it is qualified, otherwise it is unqualified.

[0087] Meanwhile, regular inspection of the SF6 gas density relay on SF6 electrical equipment is a necessary measure to prevent problems before they occur and ensure the safe and reliable operation of SF6 electrical equipment. The present invention innovatively reforms the existing gas density relay, so that the gas density relay can complete the on-line self-calibration function, and then complete the regular calibration of the mechanical density relay, which does not require maintenance personnel to go to the site to complete the calibration of the density relay, greatly improving efficiency and reducing costs. At the same time, it realizes on-line self-calibration of the gas density relay body, realizes that the gas density monitoring of electrical equipment requires no manual maintenance, improves the reliability of the power grid, improves efficiency, and reduces costs.

[0088] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0089] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0090] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0091] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0092] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A sulfur hexafluoride gas density relay based on a double-bellows system, characterized in that, The relay includes: mechanical components and remote electronic components; The mechanical components include a front housing, a device connection connector, a dial, a display pointer, a vent pipe, a dial core assembly, and a pressure regulating mechanism; wherein, the device connection connector, dial, display pointer, vent pipe, dial core assembly, and pressure regulating mechanism are disposed within the front housing; the device connection connector is connected to the chamber containing the sulfur hexafluoride gas being measured; the display pointer is disposed on the dial; the pressure regulating mechanism is connected to the vent pipe and the device connection connector; the vent pipe is connected to the dial core assembly; The watch movement assembly includes a chassis, a double bellows assembly, a membrane bonding mechanism, a hinge, a connecting rod, a bracket, a meshing spring, a pull rod, a micro switch, and a support plate. The double bellows assembly includes a main bellows, a secondary bellows, a chassis, a sleeve, and a push rod. One end of the double bellows assembly is fixedly connected to the chassis, and the other end is connected to the membrane bonding mechanism via the push rod, thereby driving the display pointer to rotate on the dial. The bracket is fixed to the chassis, and the micro switch is mounted on the bracket. One end of the engagement spring is fixed to the chassis, and the other end pulls the pull rod. The support plate is fixedly connected to the pull rod. When the gas pressure of the gas being measured in the double bellows assembly increases or decreases, the top rod increases or decreases accordingly, driving the connecting rod to form a lever structure through the hinge seat. The remote transmission electronic component includes a rear housing, an integrated pressure and temperature sensor, and a remote transmission circuit board; wherein, the integrated pressure and temperature sensor and the remote transmission circuit board are disposed inside the rear housing; the integrated pressure and temperature sensor is connected to the dual-bellows assembly; and the remote transmission circuit board is used for data transmission.

2. The relay according to claim 1, characterized in that, The mechanical components also include a front cover, a gasket, and an instrument glass; wherein the instrument glass is disposed on the outside of the dial.

3. The relay according to claim 1, characterized in that, The mechanical component also includes a three-way connector, the three joints of which are respectively connected to the equipment connection connector, the pressure regulating mechanism and the vent pipe.

4. The relay according to claim 1, characterized in that, The watch core assembly also includes an insulating pad disposed between the micro switch and the bracket.

5. The relay according to claim 1, characterized in that, The watch movement assembly also includes a locking nut, which is disposed at the upper end of the pull rod and is used to fix and lock the support plate to the pull rod.

6. The relay according to claim 1, characterized in that, The watch movement assembly also includes an adjusting screw for adjusting the gap between the support plate and the micro switch.

7. The relay according to claim 1, characterized in that, The watch movement assembly also includes a base and a guide seat, the guide seat being disposed on the base and connected to the double bellows assembly.

8. The relay according to claim 1, characterized in that, The watch movement assembly also includes a fixing screw for securing the film-forming movement.

9. The relay according to claim 1, characterized in that, The remote transmission electronic component also includes a signal sampling unit for receiving the action signal fed back by the micro switch.

10. The relay according to claim 9, characterized in that, The remote transmission electronic component also includes an intelligent control unit, which communicates with the signal sampling unit, the pressure and temperature integrated sensor, and the remote transmission circuit board.

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