Self-diagnostic gas density relay

Abstract

The application discloses a self-diagnosis gas density relay, comprising a main shell, a pressure detection assembly, a signal triggering assembly, a linkage assembly and an associated electronic assembly; the pressure detection assembly comprises a bourdon tube, a temperature compensation sheet, a signal trigger, a heater, a temperature sensor and a pressure sensor; when the gas density in the main shell changes and drives the bourdon tube to expand and contract, the linkage assembly drives the conducting rod to move linearly and approach the signal trigger, and the signal trigger is triggered; meanwhile, the damping medium and the elastic element in the signal triggering assembly can play a damping role. Through the associated electronic assembly and the pressure detection assembly, the temperature and the pressure in the main shell when the signal trigger is triggered can be measured, so that the triggering condition of the signal trigger is checked, and the problems that the existing gas density relay cannot be self-diagnosed and has poor vibration resistance are effectively solved.

Description

Technical Field

[0001] This application relates to the field of relay technology, and in particular to a self-diagnostic gas density relay. Background Technology

[0002] In electrical equipment within the power industry, high-voltage electrical equipment often contains a sealed sulfur hexafluoride (SF6) gas medium with arc-extinguishing and insulation functions. For this type of equipment, it is crucial to ensure that the gas chamber does not leak. If a gas leak occurs, the reduced gas density inside the equipment will affect its electrical performance and pose a serious threat to its safe operation. Therefore, it is necessary to monitor changes in the SF6 gas density within the gas chamber.

[0003] Currently, sulfur hexafluoride (SF6) gas density relays are commonly used to monitor the gas density. However, existing gas density relays often lack self-diagnostic capabilities, requiring regular inspection or replacement by staff to ensure the safe and reliable operation of the electrical equipment. Furthermore, the harsh operating environment of high-voltage substations, especially during system operation, generates significant vibrations that can damage the internal mechanical structure or electronic components of the density relay, thereby affecting its detection accuracy. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a self-diagnostic gas density relay to solve the problems of existing gas density relays being unable to self-diagnose and having poor vibration resistance.

[0005] To achieve the above technical objectives, this application provides a self-diagnostic gas density relay, comprising: a main housing, a pressure detection component, a signal triggering component, a linkage component, and associated electronic components;

[0006] The pressure detection assembly includes: a Baden tube, a temperature compensation plate, a signal trigger, a heater, a temperature sensor, and a pressure sensor;

[0007] The Baden tube is disposed inside the main housing, and one end is sealed to the main housing;

[0008] The temperature compensation plate is disposed inside the main housing, with one end connected to the other end of the Baden tube and the other end connected to the linkage component;

[0009] The heater is disposed inside the main housing and is used to regulate the temperature inside the main housing;

[0010] The signal trigger is fixedly disposed inside the main housing;

[0011] The sensing ends of the temperature sensor and the pressure sensor are both located inside the main housing, and are used to measure the real-time temperature value and the real-time pressure value inside the main housing, respectively.

[0012] The signal triggering component includes: a conductive connector, a signal triggering rod, a conductive rod, a guide sleeve, an elastic element, and a guide plate;

[0013] The guide plate and the guide sleeve are fixedly spaced within the main housing;

[0014] The signal trigger rod is slidably mounted on the guide plate;

[0015] One end of the transmission rod is fixedly connected to the signal trigger rod, and the other end can slide into the guide sleeve;

[0016] The conductive connector is fixed to the conductive rod and is connected to the linkage assembly in a transmission manner;

[0017] The elastic element is disposed inside the guide sleeve, and its two ends are respectively fixedly connected to the guide sleeve and the transmission rod;

[0018] A cavity is formed between the conductive rod and the guide sleeve;

[0019] The cavity is filled with a damping medium;

[0020] The linkage component is used to drive the conductive connector to move when the temperature compensation plate deforms, so that the signal trigger rod moves closer to or further away from the signal trigger.

[0021] The associated electronic components include: a control unit;

[0022] The control unit is connected to the main housing and is electrically connected to the heater, temperature sensor, pressure sensor and signal trigger. It is used to obtain the real-time temperature value and real-time pressure value at the current moment when the signal trigger is triggered by the signal trigger rod.

[0023] The control unit is also used to compare the real-time temperature value and real-time pressure value at the current moment with preset values ​​to obtain an error value, and to output an abnormal signal when the error value exceeds the preset range.

[0024] Furthermore, the associated electronic component also includes: a contact diagnostic tool;

[0025] The contact diagnostic device includes: a first optocoupler and a second optocoupler;

[0026] The positive terminal of the first optocoupler and the negative terminal of the second optocoupler are respectively connected to one end of the signal trigger;

[0027] The negative terminal of the first optocoupler is connected to the positive terminal of the second optocoupler;

[0028] The collectors of the first optocoupler and the second optocoupler are respectively connected to a power supply via resistors;

[0029] The emitters of both the first and second optocouplers are connected to the control unit.

[0030] Furthermore, the linkage assembly is disposed within the main housing and includes: a linkage rod, a meshing plate, a gear shaft, and a crank connecting rod shaft;

[0031] The gear shaft is rotatably configured;

[0032] The meshing plate is rotatably configured, with one end meshing with the gear shaft and the other end having a sliding groove.

[0033] One end of the linkage rod is rotatable and can slide into the groove, while the other end is connected to the other end of the temperature compensation plate.

[0034] One end of the crank connecting rod shaft is connected to the gear shaft, and the other end is connected to the transmission connector;

[0035] The crank connecting rod shaft is used to drive the conductive connector to move linearly when the temperature compensation plate deforms and drives the linkage rod to move and the gear shaft to rotate through the meshing plate, so that the signal trigger rod moves closer to or further away from the signal trigger.

[0036] Furthermore, the linkage assembly also includes: a front plate, a middle plate, and a rear plate;

[0037] The front plate, middle plate, and rear plate are arranged in parallel intervals in a front-to-back manner.

[0038] The front plate is fixedly connected to the middle plate via a first fixed shaft;

[0039] The middle plate is fixedly connected to the rear plate via a second fixed shaft;

[0040] The gear shaft is rotatably mounted on the front plate, middle plate, and rear plate.

[0041] Furthermore, the damping medium includes one or more of air, nitrogen, and silicone oil.

[0042] Furthermore, the guide sleeve is provided with a through hole connecting the cavity to the outside.

[0043] Furthermore, the end of the guide sleeve away from the transmission rod is provided with an air hole for connecting to the outside.

[0044] Furthermore, it also includes a secondary shell;

[0045] The secondary housing is connected to the outside of the main housing;

[0046] Both the control unit and the pressure sensor are housed within the sub-housing.

[0047] The air path of the pressure sensor is connected to the Baden tube.

[0048] Furthermore, the associated electronic component also includes: a digital display;

[0049] The digital display is located inside the sub-housing and is electrically connected to the control unit.

[0050] Furthermore, the other end of the transmission rod is T-shaped and is clearance-fitted with the guide sleeve via a flange.

[0051] As can be seen from the above technical solution, this application provides a self-diagnostic gas density relay, including: a main housing, a pressure detection component, a signal triggering component, a linkage component, and associated electronic components; the pressure detection component includes: a Baden tube, a temperature compensation plate, a signal trigger, a heater, a temperature sensor, and a pressure sensor; when the gas density inside the main housing changes, causing the Baden tube to expand or contract, the linkage component will drive the transmission rod to move linearly towards the signal trigger, triggering the signal trigger; simultaneously, the damping medium and elastic element in the cavity of the signal triggering component can play a vibration reduction role. Through the associated electronic components and the pressure detection component, the temperature and pressure inside the main housing when the signal trigger is triggered can be measured, thereby verifying the triggering conditions of the signal trigger, effectively solving the problems of existing gas density relays lacking self-diagnosis and having poor vibration resistance. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 A side view of the internal structure of a self-diagnostic gas density relay provided in an embodiment of this application;

[0054] Figure 2 A front view of a self-diagnostic gas density relay provided in an embodiment of this application;

[0055] Figure 3 This application provides an embodiment of the internal structure diagram of the main housing of a self-diagnostic gas density relay when the internal gas pressure increases.

[0056] Figure 4Wiring diagram of a contact diagnostic device in a self-diagnostic gas density relay provided in this application embodiment;

[0057] Figure 5 A schematic diagram of a linkage component for a self-diagnostic gas density relay provided in an embodiment of this application;

[0058] Figure 6 A schematic diagram of a signal triggering component for a self-diagnostic gas density relay provided in an embodiment of this application;

[0059] Figure 7 An enlarged view of the signal trigger rod position of a self-diagnostic gas density relay provided in an embodiment of this application;

[0060] Figure 8 This is a schematic diagram of a digital display screen for a self-diagnostic gas density relay provided in an embodiment of this application. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0062] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0064] Please see Figures 1 to 8This application provides a self-diagnostic gas density relay, comprising: a main housing 10, a pressure detection component 20, a signal triggering component 30, a linkage component 40, and associated electronic components 60. The main housing 10 is connected to a relay connector 90, and the gas path between them can be controlled by a solenoid valve. Under normal circumstances, the gas inside the main housing 10 possesses certain stable properties, generally including but not limited to dry air, nitrogen, or one or more other mixed oxygen gases. In the absence of gas leakage, the amount of gas within the main housing 10 remains constant. When a gas leakage occurs in the gas path of the gas density relay itself, the leaked gas enters through the relay connector 90 and is sealed within the main housing 10, increasing the gas concentration and density within the main housing 10.

[0065] The pressure detection assembly 20 includes: a Baden tube 21, a temperature compensation plate 22, a signal trigger 23, a heater 24, a temperature sensor 25, and a pressure sensor 26. The Baden tube 21 is disposed inside the main housing 10, with one end sealed to the main housing 10. The temperature compensation plate 22 is disposed inside the main housing 10, with one end connected to the other end of the Baden tube 21 and the other end connected to the linkage assembly 40. The heater 24 is disposed inside the main housing 10 and is used to regulate the temperature inside the main housing 10. The signal trigger 23 is fixedly disposed inside the main housing 10. The sensing ends of the temperature sensor 25 and the pressure sensor 26 are both disposed inside the main housing 10 and are used to measure the real-time temperature and real-time pressure values ​​inside the main housing 10, respectively.

[0066] Specifically, a sealed cavity is formed inside the main housing 10, and the cavity can be cylindrical. The Baden tubes 21 can be arranged in an arc shape. The main housing 10 contains a base 11, a support plate 12, and a partition plate 13. The Baden tubes 21 and the linkage assembly 40 can be mounted on the base 11 and located at the front end of the main housing 10. The temperature compensation plate 22 can be U-shaped.

[0067] The signal triggering assembly 30 includes: a conductive connector 31, a signal trigger rod 32, a conductive rod 33, a guide sleeve 34, an elastic element 35, and a guide plate 36; the guide plate 36 and the guide sleeve 34 are fixedly spaced within the main housing 10; the signal trigger rod 32 is slidably mounted on the guide plate 36; one end of the conductive rod 33 is fixedly connected to the signal trigger rod 32, and the other end can slide into the guide sleeve 34; the conductive connector 31 is fixed to the conductive rod 33 and is connected to the linkage assembly 40; the elastic element 35 is disposed within the guide sleeve 34, and both ends are fixedly connected to the guide sleeve 34 and the conductive rod 33 respectively; a cavity 37 is formed between the conductive rod 33 and the guide sleeve 34; the cavity 37 is filled with a damping medium; the linkage assembly 40 is used to drive the conductive connector 31 to move when the temperature compensation plate 22 deforms, so that the signal trigger rod 32 moves closer to or further away from the signal trigger 23.

[0068] The associated electronic component 60 includes: a control unit 63; the control unit 63 is connected to the main housing 10 and is electrically connected to the heater 24, temperature sensor 25, pressure sensor 26 and signal trigger 23, and is used to acquire the real-time temperature value and real-time pressure value at the current moment when the signal trigger 23 is triggered by the signal trigger rod 32; the control unit 63 is also used to compare the real-time temperature value and real-time pressure value at the current moment with preset values ​​to obtain an error value, and output an abnormal signal when the error value exceeds the preset range value.

[0069] When the gas density inside the main housing 10 changes, its gas pressure changes accordingly, causing the Baden tube 21 to undergo elastic deformation displacement, which is transmitted to the linkage component 40 through the temperature compensation plate 22. That is, through the elastic deformation of the Baden tube 21 following the gas pressure, the linkage component 40 can drive the conductive connector 31 to move, and the linkage component 40 can trigger the signal trigger 23. The signal trigger 23 transmits the alarm / lock contact signal to the back-end staff for timely maintenance, thus completing the function of the density relay to output the alarm / lock contact signal and ensuring the safe operation of the electrical equipment.

[0070] In this embodiment, the width of the Baden tube 21 is designed to be 28-30mm. By increasing the width of the Baden tube 21, its transmission force is improved, which can effectively drive the signal trigger 23 to work. At the same time, by setting the elastic element 35 and the damping medium filled in the cavity 37, the vibration resistance of the signal trigger assembly 30 can be effectively improved.

[0071] During self-diagnosis, the control unit 63 turns on the heater 24, which adjusts the temperature of the temperature compensation component 22 to increase. The heater 24 can be placed near the temperature compensation component 22, which will increase the temperature of the temperature compensation component 22. The heater 24 uses a low-power heating method and is placed far away from the electrical equipment air chamber. In this way, when the heater 24 heats, it has little impact on the temperature and pressure of the electrical equipment air chamber.

[0072] As the temperature of the temperature compensation component 22 rises, the microswitch of the signal trigger 23 is activated by the signal trigger rod 32, outputting a diagnostic connection point signal to the control unit 63. The control unit 63 acquires the real-time pressure value P and real-time temperature value T collected by the pressure sensor 26 and temperature sensor 25 at this moment, and automatically converts them into the corresponding gas density value at 20°C, which is the second density value P, based on the gas pressure-temperature characteristics. 测20 .

[0073] Control unit 63 will assign the second density value P 测20 With the first density value P 标20 Compare the values ​​and obtain the error value |P 测20 -P 标20 |;If the error value|P测20 -P 标20 If the value exceeds its preset range, the control unit 63 connects to the staff's back-end control terminal and outputs and / or uploads abnormal alarm information to it. The first density value P... 标20 This is a preset value, set at the factory when the density relay leaves the factory, obtained through rigorous testing, and stored in the control unit 63. The error value |P is obtained. 测20 -P 标20 If the value is within the preset allowable range, it indicates that the self-diagnostic gas density relay is working normally and requires no maintenance. Conversely, if the value is outside the preset range, it indicates an abnormality and requires personnel to perform maintenance and troubleshooting. For example, for a self-diagnostic gas density relay with parameters of 0.6MPa (rated pressure), 0.55MPa (alarm pressure), and 0.5MPa (lockout pressure), its first density value P... 标20 The density relay is factory-set to 0.58 MPa. After being adjusted by employees, it undergoes rigorous testing to obtain the actual value (e.g., 0.582 MPa), which is then stored in the corresponding control unit 63. Alternatively, for a self-diagnostic gas density relay with parameters of 0.6 MPa (rated pressure), 0.55 MPa (alarm pressure), and 0.5 MPa (lock-off pressure), its first density value P... 标20 The density relay is factory-set to a value of 0.58 MPa, and this value is stored in the corresponding control unit 63. This allows for mutual verification between the mechanical (Baden tube 21 and temperature compensation component 22) and electronic (pressure sensor 26 and temperature sensor 25) components of the gas density relay under the same gas density value. If the tested error is within the preset range, the gas density relay is functioning normally and requires no maintenance. If the tested error exceeds the preset range, it indicates a problem with either the mechanical or electronic components of the density relay, requiring maintenance personnel to handle it. Because the density relay has a self-diagnostic function, maintenance is unnecessary until the control unit 63 alerts the user to a problem. This solves the problem of requiring periodic calibration of existing gas density relays, improving efficiency, reducing maintenance costs, and ensuring power grid safety.

[0074] For a more specific embodiment, please refer to Figure 1 and Figure 4The associated electronic component 60 also includes a contact diagnostic unit 61; the contact diagnostic unit 61 includes a first optocoupler 611 and a second optocoupler 612; the positive terminal of the first optocoupler 611 and the negative terminal of the second optocoupler 612 are respectively connected to one end of the signal trigger 23; the negative terminal of the first optocoupler 611 is connected to the positive terminal of the second optocoupler 612; the collectors of the first optocoupler 611 and the second optocoupler 612 are respectively connected to the power supply 90 through a resistor 613; the emitters of the first optocoupler 611 and the second optocoupler 612 are both connected to the control unit 63 and grounded through a resistor.

[0075] When the signal trigger 23 is properly connected to the contact control circuit and powered on, the first optocoupler 611 is turned on, the second optocoupler 612 is turned off, and the emitter of the first optocoupler 611 outputs a high level; or, the first optocoupler 611 is turned off, the second optocoupler 612 is turned on, and the emitter of the second optocoupler 612 outputs a high level.

[0076] When the wiring of the signal trigger 23 is abnormally connected to the contact control circuit, the control circuit of the signal trigger 23 is disconnected, the first optocoupler 6111 and the second optocoupler 612 are cut off, and the emitters of the first optocoupler 611 and the second optocoupler 612 output a low level.

[0077] That is, when the internal circuit of the signal trigger 23 is normal, the light-emitting diode of the first optocoupler 611 or the second optocoupler 612 emits light, and the light turns on the phototransistor, and the emitter of the phototransistor of the first optocoupler 611 or the second optocoupler 612 outputs a high level.

[0078] If a circuit inside the signal trigger 23 is broken or incorrectly connected, the light-emitting diode of the first optocoupler 611 or the second optocoupler 612 will not emit light, the phototransistor of the first optocoupler 611 or the second optocoupler 612 will be cut off, and the emitter of the phototransistor of the first optocoupler 611 or the second optocoupler 612 will output a low level.

[0079] By outputting high or low levels from the emitter of the phototransistor of the second optocoupler 612 or the first optocoupler 611 in the contact diagnostic unit 61, the wiring status of the signal trigger 23 can be determined. If any abnormality is detected, the control unit 63 can transmit the abnormal information to the backend or target device via the communication module, thus enabling timely detection and handling of problems and ensuring the safe operation of the power grid.

[0080] The control unit 63, based on a microprocessor-based embedded system with embedded algorithms and control programs, automatically controls the entire monitoring process, including all peripherals, logic, and input / output. The control unit 63 utilizes embedded algorithms and control programs from general-purpose computers, industrial control computers, ARM chips, AI chips, CPUs, MCUs, FPGAs, PLCs, industrial control motherboards, embedded main control boards, etc., to automatically control the entire monitoring process, including all peripherals, logic, and input / output.

[0081] The power supply 80 also includes a power supply circuit, or a battery, or a rechargeable battery, or solar energy, or power obtained from a current transformer, or an inductive power source, etc.

[0082] In one embodiment, the pressure detection assembly 20 may further include an SF6 diagnostic sensor 28. The SF6 diagnostic sensor 28 is electrically connected to both the contact diagnostic unit 61 and the control unit 63. The heater 24 is positioned next to the temperature compensation unit 22, and the SF6 diagnostic sensor 28 is positioned next to the Baden tube 21, located at the bottom of the main housing 10. The SF6 diagnostic sensor 28 monitors the SF6 gas concentration in the dry air within the main housing 10 and sends an alarm signal to the control unit when the SF6 gas concentration exceeds a set value.

[0083] In another embodiment, the temperature sensor 25 and the temperature compensation element 22 are located close to each other, or the temperature sensor 25 is directly mounted on the temperature compensation element 22, which can improve monitoring performance.

[0084] In a more specific embodiment, the linkage assembly 40 is disposed within the main housing 10 and includes: a linkage rod 41, a meshing plate 42, a gear shaft 43, and a crank-connecting rod shaft 44; the gear shaft 43 is rotatably disposed; the meshing plate 42 is rotatably disposed, with one end meshing with the gear shaft 43 and the other end provided with a sliding groove 421; one end of the linkage rod 41 is rotatable and can slide into the sliding groove 421, and the other end is connected to the other end of the temperature compensation plate 22; one end of the crank-connecting rod shaft 44 is connected to the gear shaft 43, and the other end is connected to the conductive connector 31; the crank-connecting rod shaft 44 is used to drive the conductive connector 31 to move linearly when the temperature compensation plate 22 deforms and drives the linkage rod 41 to move and drives the gear shaft 43 to rotate through the meshing plate 42, so that the signal trigger rod 32 moves closer to or further away from the signal trigger 23.

[0085] When the Baden tube 21 undergoes elastic deformation in response to air pressure, it drives the linkage rod 41 to move. Subsequently, the linkage rod 41 slides within the slide groove 421 and drives the meshing plate 42 to rotate; the rotating shaft 42 drives the gear shaft 43 meshing with it to rotate, and drives the transmission rod 33 to move linearly through the crank connecting rod shaft 44.

[0086] It should be noted that the signal triggering component 30 is located at the rear end of the Baden tube 21 and can be mounted on the support plate 12 via the partition 13. The support plate 12 is mounted on the base 11.

[0087] In this embodiment, the signal trigger 23 is composed of a micro switch and its position is adjustable within a certain range on the partition 13. Specifically, the support plate 12 is provided with a signal adjuster 24; through the signal adjuster 24, the signal trigger 23 can be adjusted to a suitable position and then locked in place after it becomes loose.

[0088] Meanwhile, the micro switch on the signal trigger 23 can be disposed on the end face near the signal trigger rod 32, and this end face is inclined relative to the reciprocating motion direction of the signal trigger rod 32. The end face of the signal trigger rod 32 near the signal trigger 23 is set as an inclined surface.

[0089] In one embodiment, the crank-connecting rod shaft 44 comprises a rotating rod 441, a rotating shaft 442, a driven rod 443, and a connecting shaft 444. One end of the rotating rod 441 is fixedly connected to the gear shaft 43, and the other end is rotatably connected to one end of the driven rod 443 via the rotating shaft 442. The connecting shaft 444 is rotatably disposed at the other end of the driven rod 443 and is fixedly connected to the conductive connector 31.

[0090] Furthermore, the linkage assembly 40 also includes: a front plate 45, a middle plate 46, and a rear plate 47; the front plate 45, the middle plate 46, and the rear plate 47 are arranged in parallel intervals; the front plate 45 is fixedly connected to the middle plate 46 via a first fixed shaft 48; the middle plate 46 is fixedly connected to the rear plate 47 via a second fixed shaft 49; the gear shaft 43 is rotatably mounted on the front plate 45, the middle plate 46, and the rear plate 47. The meshing plate 42 is rotatably mounted on the first fixed shaft 48; the crank connecting rod shaft 44 is located at the rear end of the rear plate 47.

[0091] Specifically, by setting the front plate 45, the middle plate 46 and the rear plate 47, two installation spaces separated by the middle plate 46 can be formed, avoiding interference between the meshing plate 42 and other components during movement after installation.

[0092] Specifically, an air hole is provided at the end of the guide sleeve 34 away from the guide rod 33. The elastic element 34 can be a spring and is installed at the end of the guide sleeve 34 away from the guide rod 33. The air hole ensures that the guide rod 33 is not affected by local air or hydraulic pressure at the location of the elastic element 34 as it slides along the guide sleeve 34.

[0093] By selecting the type of damping medium, the damping value can be adjusted to achieve the high vibration resistance of the density relay.

[0094] Furthermore, the guide sleeve 34 is provided with a through hole 341 connecting the cavity 37 to the outside. The through hole 341 allows the damping medium to temporarily pass through, providing a buffering effect. Simultaneously, by adjusting the number and size of the through holes 341, the damping value adapted to the damping medium can be adjusted, achieving the high vibration resistance function of the density relay.

[0095] Furthermore, it also includes a secondary housing 70; the secondary housing 70 is connected to the outside of the main housing 10; the control unit 63 and the pressure sensor 26 are both disposed inside the secondary housing 70; the air passage of the pressure sensor 26 is connected to the Baden tube 21.

[0096] Furthermore, the associated electronic component 60 also includes a digital display 62; the digital display 62 is disposed within the sub-housing 70 and is electrically connected to the control unit 63. The digital display 62 can display the temperature and pressure values ​​inside the main housing 10 in real time; and an indicator light 621 can be provided on the digital display 62 to indicate whether the device is operating normally.

[0097] It should be noted that the cavity 37 formed between the transmission rod 33 and the guide sleeve 34 can be formed by setting the transmission rod 33 close to the guide sleeve 34 as a T-shape, and by using the end face flange to make clearance fit with the guide sleeve 34, while setting a certain pre-tightening force on the flange, thereby forming a sealed cavity 37 with a small clearance fit.

[0098] The main housing 10 also has lead wires, through which the connection wire of the temperature sensor 25 is connected to the control unit 63. This solution may also include a device connection connector, which is located on the main body or the electronic part. The density relay outputs a contact signal through the signal trigger 23. The communication module 62 is located in the electronic part housing or the main body housing, or the communication module and the intelligent control unit are integrated into one design. The pressure sensor is located inside the electronic part housing or the main body housing. The control unit 63, based on a microprocessor-based embedded system with embedded algorithms and control programs, automatically controls the entire monitoring process, including all peripherals, logic, and input / output. The control unit 63, based on general-purpose computers, industrial control computers, ARM chips, AI chips, CPUs, MCUs, FPGAs, PLCs, industrial control motherboards, embedded main control boards, etc., with embedded algorithms and control programs, automatically controls the entire monitoring process, including all peripherals, logic, and input / output.

[0099] The above are merely preferred embodiments of this application and are not intended to limit the present invention. Although this application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A self-diagnostic gas density relay, characterized in that, include: Main housing (10), pressure detection assembly (20), signal triggering assembly (30), linkage assembly (40) and associated electronic assembly (60); The pressure detection assembly (20) includes: a Baden tube (21), a temperature compensation plate (22), a signal trigger (23), a heater (24), a temperature sensor (25), and a pressure sensor (26). The Baden tube (21) is disposed inside the main housing (10), and one end is sealed to the main housing (10). The temperature compensation plate (22) is disposed inside the main housing (10), with one end connected to the other end of the Baden tube (21) and the other end connected to the linkage assembly (40). The heater (24) is disposed inside the main housing (10) and is used to regulate the temperature inside the main housing (10); The signal trigger (23) is fixedly disposed inside the main housing (10); The sensing ends of the temperature sensor (25) and the pressure sensor (26) are both located inside the main housing (10), and are used to measure the real-time temperature value and the real-time pressure value inside the main housing (10), respectively. The signal triggering component (30) includes: a conductive connector (31), a signal triggering rod (32), a conductive rod (33), a guide sleeve (34), an elastic element (35), and a guide plate (36); The guide plate (36) and the guide sleeve (34) are fixedly spaced within the main housing (10); The signal trigger rod (32) is slidably mounted on the guide plate (36); One end of the transmission rod (33) is fixedly connected to the signal trigger rod (32), and the other end can slide into the guide sleeve (34); The conductive connector (31) is fixed to the conductive rod (33) and is connected to the linkage assembly (40) in a transmission manner. The elastic element (35) is disposed inside the guide sleeve (34), and its two ends are respectively fixedly connected to the guide sleeve (34) and the transmission rod (33). A cavity (37) is formed between the conductive rod (33) and the guide sleeve (34). The cavity (37) is filled with a damping medium; The linkage component (40) is used to drive the conductive connector (31) to move when the temperature compensation plate (22) deforms, so that the signal trigger rod (32) moves closer to or further away from the signal trigger (23). The associated electronic component (60) includes: a control unit (63); The control unit (63) is connected to the main housing (10) and is electrically connected to the heater (24), temperature sensor (25), pressure sensor (26) and signal trigger (23). It is used to obtain the real-time temperature value and real-time pressure value at the current moment when the signal trigger (23) is triggered by the signal trigger rod (32). The control unit (63) is also used to compare the real-time temperature value and real-time pressure value at the current moment with preset values ​​to obtain an error value, and to output an abnormal signal when the error value exceeds the preset range value.

2. The self-diagnostic gas density relay according to claim 1, characterized in that, The associated electronic component (60) also includes: a contact diagnostic device (61); The contact diagnostic device (61) includes: a first optocoupler (611) and a second optocoupler (612). The positive terminal of the first optocoupler (611) and the negative terminal of the second optocoupler (612) are respectively connected to one end of the signal trigger (23); The negative terminal of the first optocoupler (611) is connected to the positive terminal of the second optocoupler (612); The collector of the first optocoupler (611) and the collector of the second optocoupler (612) are respectively connected to the power supply through a resistor (613); The emitter of the first optocoupler (611) and the emitter of the second optocoupler (612) are both connected to the control unit (63).

3. The self-diagnostic gas density relay according to claim 1, characterized in that, The linkage assembly (40) is disposed inside the main housing (10) and includes: linkage rod (41), meshing plate (42), gear shaft (43) and crank connecting rod shaft (44). The gear shaft (43) is rotatably mounted; The meshing plate (42) is rotatably configured, with one end meshing with the gear shaft (43) and the other end having a sliding groove (421). One end of the linkage rod (41) is rotatable and can slide into the groove (421), and the other end is connected to the other end of the temperature compensation plate (22); One end of the crank connecting rod shaft (44) is connected to the gear shaft (43), and the other end is connected to the transmission connector (31). The crank connecting rod shaft (44) is used to drive the transmission connector (31) to move linearly when the temperature compensation plate (22) deforms and drives the linkage rod (41) to move and drives the gear shaft (43) to rotate through the meshing plate (42), so that the signal trigger rod (32) moves closer to or further away from the signal trigger (23).

4. The self-diagnostic gas density relay according to claim 3, characterized in that, The linkage component (40) also includes: a front plate (45), a middle plate (46) and a rear plate (47). The front plate (45), middle plate (46) and rear plate (47) are arranged in parallel intervals in front and behind; The front plate (45) is fixedly connected to the middle plate (46) via a first fixed shaft (48); The middle plate (46) is fixedly connected to the rear plate (47) via a second fixed shaft (49). The gear shaft (43) is rotatably mounted on the front plate (45), the middle plate (46) and the rear plate (47).

5. The self-diagnostic gas density relay according to claim 1, characterized in that, The damping medium includes one or more of air, nitrogen, and silicone oil.

6. The self-diagnostic gas density relay according to claim 1, characterized in that, The guide sleeve (34) is provided with a through hole (341) connecting the cavity (37) to the outside.

7. The self-diagnostic gas density relay according to claim 1, characterized in that, The guide sleeve (34) has an air hole for connecting to the outside at the end away from the transmission rod (33).

8. The self-diagnostic gas density relay according to claim 1, characterized in that, It also includes a secondary housing (70); The sub-shell (70) is connected to the outside of the main shell (10); The control unit (63) and the pressure sensor (26) are both located inside the sub-housing (70); The air passage of the pressure sensor (26) is connected to the Baden tube (21).

9. The self-diagnostic gas density relay according to claim 8, characterized in that, The associated electronic component (60) further includes: a digital display (62); The digital display (62) is disposed in the sub-housing (70) and is electrically connected to the control unit (63).

10. The self-diagnostic gas density relay according to claim 1, characterized in that, The other end of the guide rod (33) is T-shaped and is fitted with the guide sleeve (34) through a flange with clearance.

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