Intelligent gas density micro-water relay

Abstract

The utility model relates to an intelligent gas density micro-water relay, and belongs to the technical field of electric power. Comprising a gas density micro-water relay body, a monitoring unit, a self-checking unit, an intelligent control unit and a gas circulation unit, the monitoring unit is located in the gas density micro-water relay body; the gas circulation unit is communicated with the self-checking unit; the intelligent control unit is fixed on the printed board behind the gas density micro-water relay body; the intelligent control unit is in communication connection with the gas circulation unit, the monitoring unit and the self-checking unit; the self-checking unit comprises an electric control valve and a pressure regulating mechanism; an air inlet of the electric control valve is communicated with an air path at the upper end of the connector, an air outlet is sequentially communicated with an air path in the Bourdon tube welding seat and an air path of the pressure adjusting mechanism, and the air path of the pressure adjusting mechanism is communicated with the Bourdon tube. The density and micro-water content of electrical equipment with insulating gases such as sulfur hexafluoride and the like can be monitored on line, and the purpose of verification work can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, in particular to an intelligent gas density micro-water relay. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Sulfur hexafluoride electrical products have been widely used in the power sector, industrial and mining enterprises, and have promoted the rapid development of the power industry. The arc extinguishing medium and insulating medium of sulfur hexafluoride electrical products are sulfur hexafluoride gas, which cannot leak. If leakage occurs, the reliable and safe operation of sulfur hexafluoride electrical products cannot be guaranteed. Therefore, it is very necessary to monitor the sulfur hexafluoride density value of sulfur hexafluoride electrical products.

[0004] At present, gas density relays are usually used to monitor the density of sulfur hexafluoride in sulfur hexafluoride electrical products. In order to ensure the accuracy of monitoring during the monitoring process, it is often necessary to connect a density relay calibrator to calibrate the gas density relay, which will increase the size and weight of the gas density relay device and increase the difficulty of installation.

[0005] At the same time, few gas density relays can simultaneously monitor the density of sulfur hexafluoride gas and the micro-water content inside electrical equipment. When the temperature drops, excessive moisture in the electrical equipment may form condensation water, which will significantly reduce the insulation strength of the insulating surface, or even flash over, causing serious damage. At the same time, due to the uneven distribution of gas in the gas chamber of electrical equipment, some relays that monitor micro-water content cannot accurately monitor the micro-water content inside electrical equipment. Utility Model Content

[0006] In order to solve the above problems existing in the prior art, the utility model provides an intelligent gas density and micro-water relay, which is used to control and monitor the density and micro-water content of sulfur hexafluoride gas in a sealed container, and promptly sends out an alarm signal and a locking signal for gas leakage and micro-water content in sulfur hexafluoride electrical equipment, while realizing online monitoring of sulfur hexafluoride gas density and micro-water in sulfur hexafluoride electrical equipment.

[0007] The utility model aims to provide an intelligent gas density micro-water relay.

[0008] An intelligent gas density micro-water relay, comprising a gas density micro-water relay body, a monitoring unit, a self-checking unit, an intelligent control unit and a gas circulation unit;

[0009] The monitoring unit is located inside the gas density micro-water relay body;

[0010] The gas circulation unit is connected to the self-checking unit through a joint;

[0011] The intelligent control unit is fixed on a printed circuit board, and the printed circuit board is located behind the gas density micro-water relay body; the intelligent control unit is respectively connected to the gas circulation unit, the monitoring unit and the self-checking unit for communication, and the gas circulation unit and the self-checking unit are controlled by the intelligent control unit, and the micro-water content in the electrical equipment is obtained by the monitoring unit;

[0012] The self-calibration unit includes an electric control valve and a pressure regulating mechanism. The air inlet of the electric control valve is connected to the air circuit at the upper end of the joint, and the air outlet of the electric control valve is connected to the air circuit inside the Baden tube welding seat, and is connected to the air circuit of the pressure regulating mechanism through the air circuit inside the Baden tube welding seat, and the air circuit of the pressure regulating mechanism is connected to the Baden tube.

[0013] As a further technical solution, the gas density micro-water relay body includes a shell, a Baden tube, a temperature compensation metal element and a displacement amplification mechanism; the Baden tube is arranged inside the shell, one end of the Baden tube is welded to the Baden tube welding seat, a gas path is arranged inside the Baden tube welding seat and is connected to the Baden tube; the other end of the Baden tube is welded to the Baden tube sealing seat; the Baden tube sealing seat is connected to one end of the temperature compensation metal element, and the other end of the temperature compensation metal element is connected to the displacement amplification mechanism; the displacement amplification mechanism is fixed to the Baden tube welding seat.

[0014] As a further technical solution, the monitoring unit adopts a MEMS pressure sensor, a MEMS temperature sensor and a MEMS micro-water sensor.

[0015] As a further technical solution, the MEMS temperature sensor is installed in the middle of the temperature compensation bimetallic element; the MEMS micro-water sensor is installed on the Baden tube welding seat; and the MEMS pressure sensor is sealed and fixed behind the Baden tube welding seat.

[0016] As a further technical solution, the gas circulation unit includes an air chamber, a heating component and a protective cover; the air chamber is connected to the self-calibration unit through a joint, and the heating component is located inside the air chamber; a protective cover is also provided outside the air chamber.

[0017] As a further technical solution, the intelligent control unit includes an intelligent processor, a power module, and a communication module; the power module is connected to the intelligent processor and the communication module and supplies power to the intelligent processor and the communication module; the intelligent processor is respectively communicated with the electric control valve, the gas circulation unit, and the monitoring unit; the intelligent processor, the power module, and the communication module are all fixed on a printed circuit board.

[0018] As a further technical solution, the self-checking unit further includes a signal acquisition unit, and the signal acquisition unit is connected to the intelligent control unit.

[0019] As a further technical solution, the signal acquisition unit includes an intermediate relay J1, a diode D1 and a photoelectric coupler; the output end of the intelligent processor is connected in series with the photoelectric coupler, the contact PJ of the gas density micro-water relay and the diode D1; the contact PJ of the gas density micro-water relay is also connected in parallel with the contacts J11 and J12 of the intermediate relay, and the contacts J11 and J12 of the intermediate relay are connected to the alarm / lockout control circuit; the photoelectric coupler is also connected to the power supply through the resistor R1; one end of the diode D1 is also connected to another power supply.

[0020] As a further technical solution, a heat insulating member is further provided between the gas density micro-water relay body and the intelligent control unit.

[0021] As a further technical solution, a shielding member is further provided around the MEMS pressure sensor.

[0022] Beneficial effects of one or more of the above technical solutions:

[0023] The electric control valve and pressure regulating mechanism in the self-checking unit are respectively embedded in the Baden tube welding seat, so that the intelligent gas density micro-water relay in the utility model has a smaller appearance and volume, reduces the weight of the device, and can also reduce costs. And the space of the housing is fully utilized, so that it can be widely used in various electrical equipment.

[0024] Pressure, temperature and water content signals are collected through MEMS pressure sensors, MEMS temperature sensors and MEMS water content sensors, and converted into density values ​​and water content through intelligent processors. Through the communication module, the gas density value and water content can be converted into digital signals to achieve long-distance transmission, thereby realizing online monitoring of the density and water content of gas electrical equipment.

[0025] The gas circulation unit is arranged on the joint, and the gas circulation unit is connected to the intelligent processor. Under the control of the intelligent processor, the gas circulation unit can play a role in gas circulation, and thus can accurately monitor the micro-water content of the gas.

[0026] In order to improve the accuracy of monitoring, a thermal insulation component is provided on the outside of the power module to overcome the influence of power supply temperature rise on the measurement of MEMS temperature sensor.

[0027] By arranging the shielding element on the MEMS pressure sensor, the MEMS pressure sensor will not be damaged by the influence of the electromagnetic field, thereby improving the anti-electromagnetic interference performance of the monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0029] Figure 1 It is a schematic diagram of the structure of the gas density micro-water relay in the embodiment of the utility model;

[0030] Figure 2 Schematic diagram of the internal structure of the gas density micro-water relay in the embodiment;

[0031] Figure 3 A circuit diagram of a self-checking embodiment of the utility model;

[0032] In the figure, 1 is a gas density micro-water relay body; 2 is a gas circulation unit; 2-1 is a gas chamber; 2-2 is a heating component; 2-3 is a protective cover; 3 is a shell; 4 is a Baden tube; 5 is a temperature compensation metal element; 6 is a displacement amplification mechanism; 7 is a Baden tube welding seat; 8 is a Baden tube sealing seat; 9 is a pointer; 10 is a dial; 11 is a MEMS pressure sensor; 12 is a MEMS temperature sensor; 13 is a MEMS micro-water sensor; 14 is a shielding member; 15 is a printed circuit board; 16 is a heat insulating member; 17 is a connector; 18 is an electric control valve; 19 is a pressure regulating mechanism; 20 is an intelligent processor; 21 is a power module; 22 is a communication module; 23 is a signal acquisition unit; 24 is an antenna; 25 is a protection circuit DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-3 , describing the specific implementation of this embodiment.

[0034] See also Figure 1 and Figure 2 The utility model is an intelligent gas density micro-water relay, comprising a gas density micro-water relay body 1, a monitoring unit, a self-checking unit, an intelligent control unit and a gas circulation unit 2;

[0035] The monitoring unit is located inside the gas density micro-water relay body 1 and collects pressure, temperature and micro-water content signals of the electrical equipment;

[0036] The gas circulation unit 2 is connected to the self-checking unit via a joint 17;

[0037] The intelligent control unit is fixed on a printed circuit board 15, and the printed circuit board 15 is located behind the gas density micro-water relay body 1; the intelligent control unit is respectively communicated with the gas circulation unit 2, the monitoring unit and the self-checking unit, and the intelligent control unit is used to control the operation of the gas circulation unit and the self-checking unit, and the monitoring unit is used to obtain the micro-water content in the electrical equipment.

[0038] In this embodiment, the gas density micro-water relay body 1 includes a housing 3, a Baden tube 4, a temperature compensation metal element 5 and a displacement amplification mechanism 6; the Baden tube 4 is an elastic Baden tube, which is arranged inside the housing 3, one end of the Baden tube 4 is welded to the Baden tube welding seat 7, and is connected to the gas path inside the Baden tube welding seat 7; the other end of the Baden tube 4 is welded to the Baden tube sealing seat 8; the Baden tube sealing seat 8 is connected to one end of the temperature compensation metal element 5, and the other end of the temperature compensation metal element 5 is connected to the displacement amplification mechanism 6; the displacement amplification mechanism 6 is fixed to the Baden tube welding seat 7. In this embodiment, the working principle of the gas density micro-water relay is as follows:

[0039] The Baden tube 4 is an elastic Baden tube, and the temperature compensation metal element 5 is used to correct the changing pressure and temperature to reflect the change of the density of sulfur hexafluoride gas. That is, under the pressure of the sulfur hexafluoride gas to be measured, due to the effect of the temperature compensation metal element 5, the change of its density value and the corresponding change of the pressure value force the end of the Baden tube 4 to produce a corresponding elastic deformation, which is transmitted to the shaft of the displacement amplification mechanism 6 by means of the temperature compensation metal element 5 and the connecting rod, and is transmitted to the pointer 9 through the shaft, so that the measured sulfur hexafluoride gas density value is indicated on the dial 10. When the density value drops to a certain extent and reaches the alarm or lockout value, the shaft offset in the displacement amplification mechanism 6 increases, so that the micro switch node in the signal adjustment mechanism is connected, and an alarm or lockout signal is issued, so as to achieve the purpose of monitoring and controlling the sulfur hexafluoride gas density in the electrical switch and other equipment, so that the electrical equipment can work safely. The above principle belongs to the common sense in the field known to those skilled in the art, and will not be elaborated too much here.

[0040] Furthermore, the monitoring unit in this embodiment includes a pressure sensor, a temperature sensor and a micro-water sensor. The pressure sensor, the temperature sensor and the micro-water sensor are all MEMS sensors. The MEMS temperature sensor 12 is installed in the middle of the temperature compensation metal element 5, which can ensure the monitoring of accurate temperature changes and reduce the error between the density value monitored online in the background and the density value displayed by the on-site pointer. The MEMS micro-water sensor 13 is installed on the Baden tube welding seat 7; the MEMS pressure sensor 11 is sealed and fixed behind the Baden tube welding seat 7. The pressure, temperature and micro-water content signals are collected by the MEMS pressure sensor 11, the MEMS temperature sensor 12 and the MEMS micro-water sensor 13. At the same time, in order to improve the anti-electromagnetic interference performance of the monitoring device, it also includes a shielding member 14 that can shield the electric field and the magnetic field, and the shielding member 14 is arranged on the periphery of the MEMS pressure sensor 11. The MEMS pressure sensor 11 will not be damaged by the influence of the electromagnetic field.

[0041] Furthermore, the intelligent control unit is fixed on the printed circuit board 15, and the printed circuit board 15 is located behind the gas density micro-water relay body 1; the intelligent control unit includes an intelligent processor 20, a power module 21, and a communication module 22. The power module 21 is connected to the intelligent processor 20 and the communication module 22 and supplies power to the intelligent processor 20 and the communication module 22. In order to overcome the influence of the power supply temperature rise on the measurement of the MEMS temperature sensor 12, a heat insulation member 16 is also provided between the gas density micro-water relay body 1 and the intelligent control unit. In addition, the intelligent processor is also protected by a protection circuit 25 to prevent the intelligent processor 20 from being damaged by excessive current or voltage.

[0042] The intelligent processor 20 in the intelligent control unit is respectively connected to the gas circulation unit 2, the monitoring unit and the self-checking unit for communication. The intelligent processor 20 is used to control the operation of the gas circulation unit and the self-checking unit. The monitoring unit is used to obtain the moisture content, temperature and pressure value in the electrical equipment, which are converted into density value and moisture content by the intelligent processor 20 and then passed through the communication module 22, which is also connected to the antenna 24. The intelligent processor 20 is used to convert the gas density value and moisture content into digital signals, which are transmitted over long distances through the antenna 24, thereby achieving the purpose of online monitoring of the density and moisture content of gas electrical equipment.

[0043] Furthermore, in this embodiment, in order to improve the accuracy of micro-water monitoring, a gas circulation unit 2 is also included, and the gas circulation unit is connected to the self-checking unit through the connector 17; the gas circulation unit 2 is also connected to the intelligent processor 20. Through the control of the circulation device by the intelligent processor 20, the gas can be circulated, and the micro-water content inside the electrical equipment can be monitored. Specifically, the gas circulation unit 2 includes an air chamber 2-1, a heating component 2-2 and a protective cover 2-3. The air chamber 2-1 is connected to the gas density micro-water relay body 1 through the connector 17, and the heating component 2-2 is located inside the air chamber 2-1; a protective cover 2-3 is also provided outside the air chamber 2-1. The gas circulation unit 2 heats the gas in the air chamber 2-1 by means of the heating component 2-2, so that the temperature of the gas and the air pressure increase. The generated air pressure difference forces the gas in the air chamber 2-1 and the air path to flow outward into the air chamber of the electrical equipment. When a certain temperature is reached, the heating component 2-2 stops heating, the gas gradually cools down, and the air pressure decreases, and the gas in the air chamber of the electrical equipment flows back to the air chamber 2-1 of the gas circulation unit 2. After continuously repeating this process, the circulation of the gas can be realized, so that the micro-water content in the air chamber of the electrical equipment is evenly distributed in the entire ventilation air path, and then the MEMS micro-water sensor 13 is used for testing. At the same time, since the distance between the MEMS micro-water sensor 13 and the gas circulation unit is close, it is further ensured that the most accurate micro-water amount is obtained.

[0044] Furthermore, in order to realize the self-calibration of the intelligent gas density micro-water relay, a self-calibration unit is also provided in the present embodiment, wherein the self-calibration unit includes an electric control valve 18, a pressure regulating mechanism 19 and a signal acquisition unit 23, wherein the air inlet of the electric control valve 18 is connected to the air path at the upper end of the joint 17, and the electric control valve 18 is also connected to the intelligent processor 20, and the air path is controlled by the intelligent processor 20. The air outlet of the electric control valve 18 is connected to the air path inside the Baden tube welding seat 7, and is connected to the air path of the pressure regulating mechanism 19 through the air path inside the Baden tube welding seat 7, and the air path of the pressure regulating mechanism 19 is connected to the Baden tube 4. The pressure regulating mechanism 19 is composed of a piston, an adjusting rod and a stepping motor, and the pressure regulating mechanism 19 is configured to adjust the gas pressure rise and fall of the gas density micro-water relay, so that the relay generates a contact signal action, and the pressure regulating mechanism 19 adjusts the gas pressure value of the air chamber by driving the piston driven by the stepping motor. By connecting the electric control valve 18 and the pressure regulating mechanism 19 to the gas path of the Baden tube welding seat 7, the gas density micro-water relay can be ensured to be small in size while achieving self-calibration, which can effectively reduce the weight of the equipment and reduce the cost. At the same time, the space inside the housing can be fully utilized and it can be widely used in various electrical equipment.

[0045] The signal acquisition unit includes an intermediate relay J1, a diode D1 and a photoelectric coupler. The output end of the intelligent processor is connected in series with the photoelectric coupler, the contact PJ of the gas density micro-water relay and the diode D1; the contact PJ of the gas density micro-water relay is also connected in parallel with the contacts J11 and J12 of the intermediate relay, and the contacts J11 and J12 of the intermediate relay are connected to the alarm / lock control circuit. The photoelectric coupler is also connected to the power supply through the resistor R1; one end of the diode D1 is also connected to another power supply.

[0046] Further, combined with Figure 3 The working principle of self-checking is as follows: the gas density and water content relay performs data analysis based on the set check time and / or check instruction, the gas density value obtained based on the collected pressure value and temperature value, and the obtained water content. Under the condition that the gas density and water content relay is allowed to be checked, the signal acquisition unit 23 is directly or indirectly adjusted to the check state through the intelligent processor 20. Figure 3 As shown, in the verification state, the signal acquisition unit 23 cuts off the control loop of the contact signal of the gas density relay, that is, the intelligent processor 20 controls the signal acquisition unit 23 to de-energize the control coil of the intermediate relay J1 of the signal acquisition unit 23, and its contacts J11 and J12 are disconnected, so that the contact signal of the gas density relay is disconnected from the control loop of the contact signal. At the same time, the contact PJ of the gas density relay is connected to the intelligent processor 20.

[0047] Then, the pressure regulating mechanism 19 is controlled by the intelligent processor 20. The volume of the air chamber of the pressure regulating mechanism 19 decreases and the pressure increases under the push of the electric piston. Then, the intelligent processor 20 controls the electric control valve 18 to close, thereby cutting off the gas path between the gas density relay and the electrical equipment.

[0048] The intelligent control processor 20 controls the electric piston of the pressure regulating mechanism 19 to change the pressure of the gas chamber, adjusts the gas pressure of the gas density relay, and causes the gas pressure to drop slowly, so that the gas density relay generates an alarm and a lockout signal contact action, and the contact action is transmitted to the intelligent processor 20 through the signal acquisition unit 23. The intelligent processor 20 obtains the gas density value according to the pressure value P and the temperature value T when the alarm and the lockout signal contacts are actuated, or directly obtains the gas density value, detects the alarm and the lockout contact signal action value of the gas density relay, and completes the verification of the contact signal action value of the gas density relay.

[0049] Next, the intelligent processor 20 drives the electric piston of the pressure regulating mechanism 19 to slowly increase the gas pressure, causing the gas density relay to alarm and reset the lockout signal contacts. The alarm and lockout signal contact resets are transmitted to the intelligent processor 20 through the signal acquisition unit 23. The intelligent processor 20 obtains the gas density value based on the pressure value P and temperature value T when the contacts are reset, or directly obtains the gas density value, detects the alarm and lockout contact signal return values ​​of the gas density relay, and completes the verification of the contact signal return value of the gas density relay.

[0050] When all the contact signal verification work is completed, the intelligent processor 20 controls the electric control valve 18 to open, so that the gas density relay and the gas circuit of the electrical equipment are connected to each other, and the signal acquisition unit 23 is adjusted to the working state. At this time, the signal acquisition unit 23 is controlled by the intelligent processor 20 to energize the intermediate relay J1 control coil of the signal acquisition unit 23, and its contacts J11 and J12 are closed, so that 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 resumes normal working state.

[0051] This embodiment can realize online calibration of the gas density relay, improve efficiency, and reduce operation and maintenance costs. At the same time, the entire calibration process achieves zero emission of SF6 gas, complies with environmental protection regulations, and is conducive to promotion and application.

[0052] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. An intelligent gas density micro-water relay, characterized in that: It includes a gas density micro-water relay body, a monitoring unit, a self-checking unit, an intelligent control unit and a gas circulation unit; The monitoring unit is located inside the gas density micro-water relay body; The gas circulation unit is connected to the self-checking unit through a joint; The intelligent control unit is fixed on a printed circuit board, and the printed circuit board is located behind the gas density micro-water relay body; the intelligent control unit is respectively connected to the gas circulation unit, the monitoring unit and the self-checking unit for communication, and the gas circulation unit and the self-checking unit are controlled by the intelligent control unit, and the micro-water content in the electrical equipment is obtained by the monitoring unit; The self-calibration unit includes an electric control valve and a pressure regulating mechanism. The air inlet of the electric control valve is connected to the air circuit at the upper end of the joint, and the air outlet of the electric control valve is connected to the air circuit inside the Baden tube welding seat, and is connected to the air circuit of the pressure regulating mechanism through the air circuit inside the Baden tube welding seat, and the air circuit of the pressure regulating mechanism is connected to the Baden tube.

2. An intelligent gas density micro-water relay as claimed in claim 1, characterized in that: The gas density micro-water relay body includes a shell, a Baden tube, a temperature compensation metal element and a displacement amplification mechanism; the Baden tube is arranged inside the shell, one end of the Baden tube is welded to the Baden tube welding seat, a gas path is arranged inside the Baden tube welding seat and is connected to the Baden tube; the other end of the Baden tube is welded to the Baden tube sealing seat; the Baden tube sealing seat is connected to one end of the temperature compensation metal element, and the other end of the temperature compensation metal element is connected to the displacement amplification mechanism; the displacement amplification mechanism is fixed to the Baden tube welding seat.

3. An intelligent gas density micro-water relay as claimed in claim 1, characterized in that: The monitoring unit adopts a MEMS pressure sensor, a MEMS temperature sensor and a MEMS micro-water sensor.

4. An intelligent gas density micro-water relay as claimed in claim 3, characterized in that: The MEMS temperature sensor is installed in the middle of the temperature compensation bimetallic element; the MEMS micro-water sensor is installed on the Baden tube welding seat; and the MEMS pressure sensor is sealed and fixed behind the Baden tube welding seat.

5. An intelligent gas density micro-water relay as claimed in claim 3, characterized in that: A shielding member is also arranged around the MEMS pressure sensor.

6. An intelligent gas density micro-water relay as claimed in claim 1, characterized in that: The gas circulation unit comprises an air chamber, a heating component and a protective cover; the air chamber is connected to the self-checking unit through a joint, and the heating component is located inside the air chamber; a protective cover is also arranged outside the air chamber.

7. An intelligent gas density micro-water relay as claimed in claim 1, characterized in that: The intelligent control unit includes an intelligent processor, a power module, and a communication module; the power module is connected to the intelligent processor and the communication module and supplies power to the intelligent processor and the communication module; the intelligent processor is respectively connected to the electric control valve, the gas circulation unit, and the monitoring unit for communication; the intelligent processor, the power module, and the communication module are all fixed on a printed circuit board.

8. An intelligent gas density micro-water relay as claimed in claim 1, characterized in that: The self-checking unit also includes a signal acquisition unit, and the signal acquisition unit is connected to the intelligent control unit.

9. An intelligent gas density micro-water relay as claimed in claim 8, characterized in that: The signal acquisition unit includes an intermediate relay J1, a diode D1 and a photoelectric coupler; the output end of the intelligent processor is connected in series with the photoelectric coupler, the contact PJ of the gas density micro-water relay and the diode D1; the contact PJ of the gas density micro-water relay is also connected in parallel with the contacts J11 and J12 of the intermediate relay, and the contacts J11 and J12 of the intermediate relay are connected to the alarm / lockout control circuit; the photoelectric coupler is also connected to the power supply through the resistor R1; one end of the diode D1 is also connected to another power supply.

10. The intelligent gas density micro-water relay according to claim 1, characterized in that: A heat insulating member is also provided between the gas density micro-water relay body and the intelligent control unit.

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