Online monitoring device for mixing ratio of mixed gas of nitrogen and sulfur hexafluoride

Abstract

The invention discloses a nitrogen and sulfur hexafluoride mixed gas mixing ratio on-line monitoring device which comprises an on-line monitoring device, a liquid crystal screen is installed on the surface of the on-line monitoring device, a temperature control device is installed on one side of the on-line monitoring device, a seven-star junction box is installed on the other side of the on-line monitoring device, and a wiring harness connector is arranged beside the seven-star junction box. A connecting device is mounted at the bottom of the online monitoring device, and a battery cover is mounted behind the online monitoring device; a sensing assembly is arranged in the connecting device, a circuit board is arranged in the sensing assembly, an air chamber sleeve is installed on the circuit board, a sealing disc is fixed to the bottom of the air chamber sleeve, at least one sensor is installed on the sealing disc, and tuning fork sensors are arranged between the sensors. Static monitoring of the mixing ratio is realized through the tuning fork sensor, mutual inspection with the sensor is realized in combination with the thermal conductivity principle, the data reliability of the online monitoring device is improved, a tail gas treatment link caused by gas sampling is avoided, the adaptability of the device is improved, and monitoring data is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of power equipment monitoring, in particular to a monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas. Background Art

[0002] SF6 and N2 mixed gas is an insulating medium widely used in the power industry. It combines the high electrical strength of SF6 gas and the environmental protection characteristics of N2 gas. By adjusting the ratio of SF6 to N2, its electrical performance can be optimized to meet the needs of different power equipment. Generally speaking, the optimal mixing ratio is between 30% SF6 and 70% N2, which not only maintains good insulation performance, but also significantly reduces greenhouse gas emissions, making it more environmentally friendly.

[0003] However, the prior art has the following deficiencies: during the use of the current online monitoring device for the SF6 mixed N2 mixture ratio, online monitoring is generally performed in two ways, one of which is an electrochemical sensor that mainly uses the electrochemical principle to diagnose the equipment operation status by detecting the gas produced by the decomposition of SF6 gas, but does not have the SF6 and N2 mixture ratio monitoring function; and the other is an infrared spectrum absorption sensor, but the infrared spectrum absorption sensor is easily interfered by other gases in a complex environment, affecting the monitoring accuracy. In addition, the infrared spectrum absorption sensor requires sampling gas and cannot achieve a static monitoring function. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an online monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas to achieve online static monitoring of the mixing ratio.

[0005] In order to achieve the above object, the present invention is implemented by the following technical scheme: an online monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas, comprising an online monitoring device, a liquid crystal screen is installed on the surface of the online monitoring device, a temperature control device is installed on one side of the online monitoring device, a seven-star junction box is installed on the other side, a wiring harness connector is arranged next to the seven-star junction box, a connecting device is installed at the bottom of the online monitoring device, and a battery cover is installed at the rear of the online monitoring device; a sensor component is arranged in the connecting device, a circuit board is arranged in the sensor component, an air chamber sleeve is installed on the circuit board, a sealing disk is fixed at the bottom of the air chamber sleeve, at least one sensor is installed on the sealing disk, and a tuning fork sensor is arranged between the sensors. The tuning fork sensor is installed at the bottom of the air chamber sleeve for data collection of the mixing ratio of SF6 and N2, and the sensors on both sides are mutually checked to improve the accuracy of the online monitoring process.

[0006] For further improvement of the present invention, an instrument rear shell is provided inside the on-line monitoring device. A device side groove is formed on the side wall of the on-line monitoring device. An antenna is installed on the sensing assembly. A slot is arranged beside the antenna, and a main board is installed on the slot. A connecting pipe is arranged below the sensing assembly. The antenna is used for the wireless communication module to transmit signals, so as to realize remote data transmission, and then feedback the data to the terminal for corresponding display and reminder of abnormal situations.

[0007] For further improvement of the present invention, the connecting pipe is connected to the air chamber sleeve. The sealing disc is arranged between the connecting pipe and the air chamber sleeve. The sensor and the tuning fork sensor are both arranged inside the connecting pipe. The circuit board is electrically matched with the antenna and the slot respectively. The sealing disc plays a sealing role for the air chamber sleeve. The mixed SF6 and N2 gases are input through the connecting pipe below, and then under the cooperation of the built-in sensor and the tuning fork sensor, it is feedback to the circuit board, and the data is presented by the cooperation of the main board.

[0008] For further improvement of the present invention, the sensor and the tuning fork sensor are electrically matched with the circuit board. The instrument rear shell is bolted to the battery cover. A storage battery is placed in the space at the rear of the battery cover. The main board is matched with the liquid crystal screen. The connecting pipe penetrates out of the on-line monitoring device. The storage battery is installed in the instrument rear shell. When the system is powered off, it automatically switches to the power supply of the storage battery, and the maximum battery life is 7 days, providing power support for the on-line monitoring device and avoiding interruption of data monitoring in the middle.

[0009] For further improvement of the present invention, an outer cover shell is provided inside the temperature control device. A rear support platform is fixed on the outer wall of the outer cover shell. A control screen is installed on the surface of the rear support platform. A thermometer is arranged below the control screen. A filter screen plate is installed on the side wall of the outer cover shell. A water guide pipe is installed at the bottom of the outer cover shell. When the outside air is inhaled inward, dust and foreign matters are blocked by the filter screen plate and separated outside the outer cover shell.

[0010] For further improvement of the present invention, a shell inner cavity is formed inside the outer cover shell. Side sliding frames are installed on both sides of the inner wall of the shell inner cavity. A temperature control component is arranged between the side sliding frames. A plurality of locking ears are fixed on the inner wall of the shell inner cavity. A control box is installed below the temperature control component. The locking ears are used for connecting the filter screen plate. The filter screen plate can be quickly fixed and disassembled by means of bolt screwing, so that the built-in temperature control component is protected and unnecessary dust influence on the temperature control component is avoided.

[0011] For further improvement of the present invention, a fixing frame is provided inside the temperature control assembly. A plurality of refrigeration chips are installed on the surface of the fixing frame, a temperature sensor is installed above the refrigeration chips, a plurality of water guiding blocks are installed below the refrigeration chips, a water guiding groove is formed on the fixing frame, a drainage groove is arranged below the water guiding groove, and a plurality of heating sheets are installed on the rear surface of the fixing frame, and an exhaust fan is arranged in front of the heating sheets. The water guiding blocks are used to guide the condensed water generated by the refrigeration chips to accurately fall into the water guiding groove, and then drip from the water guiding groove into the drainage groove to form external discharge.

[0012] For further improvement of the present invention, the exhaust fan faces the side groove of the device. The heating sheet and the refrigeration chip are both electrically matched with the control box. The temperature control box is electrically matched with the temperature sensor. The drainage groove is arranged below the water guiding groove. The drainage groove is connected to the water guiding pipe. The filter plate is bolted to the locking ear. The exhaust fan is electrically matched with the control box. Both sides of the fixing frame are connected to the side sliding frame. The exhaust fan sucks in external air, so that when the on-line monitoring device is used in different position areas, it is convenient for overall temperature control and avoids a large gap between the on-line monitoring device and the surrounding environment.

[0013] For further improvement of the present invention, a sliding beam is arranged inside the side sliding frame. An auxiliary sliding groove is formed on the sliding beam. A sliding block is installed in the auxiliary sliding groove. A through hole is formed on the sliding beam, and a limit pin penetrates through the through hole. During installation, the sliding block displaces in the auxiliary sliding groove, and after the sliding block is installed, the limit pin is inserted into the through hole to limit the sliding block.

[0014] For further improvement of the present invention, the limit pin is arranged in front of the sliding block. The sliding block is slidably matched with the auxiliary sliding groove. The sliding beam is fixed to the inner wall of the shell cavity. The outer wall of the sliding block is fixed to the outer wall of the fixing frame. The sliding beam is fixed to the outer wall of the fixing frame, which can drive the fixing frame and the other components installed above to displace synchronously, facilitating the overall removal for maintenance and repair.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the tuning fork sensor built in the on-line monitoring device of the present invention, the mixing ratio of SF6 and N2 is realized for on-line static monitoring, and the mutual inspection with the sensor is realized in combination with the thermal conductivity principle, improving the data reliability of the on-line monitoring device. Moreover, the tuning fork sensor does not require gas flow during the detection process, and can realize static mixing ratio detection, solving the problem of tail gas treatment caused by gas sampling, improving the on-site adaptability of the device, and making the monitoring data more accurate.

[0016] 2. The present invention installs the temperature control device on one side of the on-line monitoring device, covers the side groove of the on-line monitoring device under the action of the outer housing, and the temperature sensor built in the outer housing senses the external temperature during operation, and cooperates with the control box to trigger the refrigerating sheet or the heating sheet, so as to ensure that the on-line monitoring device adapts to different temperatures in different use environments and compensates for the required temperature, thereby avoiding a too large temperature difference between the on-line monitoring device and the outside world and affecting the abnormal monitoring data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the device of the present invention; Figure 2 is a schematic rear view structural diagram of the device of the present invention; Figure 3 is a schematic sectional structural diagram of the device of the present invention; Figure 4 is a schematic three-dimensional structural diagram of the device of the present invention; Figure 5 is a schematic three-dimensional structural diagram of the sensing component in the device of the present invention; Figure 6 is a schematic three-dimensional structural diagram of the tuning fork sensor in the device of the present invention; Figure 7 is a schematic side view structural diagram of the temperature control device in the device of the present invention; Figure 8 is a schematic internal structural diagram of the outer housing of the device of the present invention; Figure 9 is Figure 8 an enlarged structural diagram within the range A in Figure 10 is a schematic internal sectional structural diagram of the housing of the device of the present invention.

[0018] In the figure: on-line monitoring device - 1, liquid crystal display screen - 2, temperature control device - 3, connection device - 4, seven-star junction box - 5, wiring harness connector - 6, battery cover - 7, nameplate - 8, device side slot - 11, instrument rear shell - 12, outer cover shell - 31, control panel - 32, thermometer - 33, rear support platform - 34, filter screen plate - 35, water guide pipe - 36, sensing component - 41, main board - 42, antenna - 43, slot - 44, connecting pipe - 45, inner cavity of the shell - 311, side sliding frame - 312, temperature control component - 313, locking ear - 314, control box - 315, air chamber sleeve - 411, circuit board - 412, sealing disc - 413, sensor - 414, tuning fork sensor - 415, sliding beam - 3121, auxiliary sliding groove - 3122, through hole - 3123, limit pin - 3124, slider - 3125, fixing frame - 3131, temperature sensor - 3132, refrigeration sheet - 3133, water guide groove - 3134, water guide block - 3135, drainage groove - 3136, heating sheet - 3137, exhaust fan - 3138. Detailed implementation mode

[0019] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation modes described herein are only used to explain the present invention, but not to limit the present invention.

[0020] As shown in the attached Figure 1 to the attached Figure 6 figure: This embodiment provides an on-line monitoring device 1, on the surface of which a liquid crystal display screen 2 is installed. On one side of the on-line monitoring device 1, a temperature control device 3 is installed, and on the other side, a seven-star junction box 5 is installed. A wiring harness connector 6 is arranged beside the seven-star junction box 5. A connection device 4 is installed at the bottom of the on-line monitoring device 1, and a battery cover 7 is installed behind the on-line monitoring device 1. A nameplate 8 is arranged below the battery cover 7. An instrument rear shell 12 is arranged inside the on-line monitoring device 1. A device side slot 11 is opened on the side wall of the on-line monitoring device 1. An antenna 43 is installed on the sensing component 41. A slot is arranged beside the antenna 43, and a main board 42 is installed on the slot. A connecting pipe 45 is arranged below the sensing component 41. A sensing component 41 is arranged inside the connection device 4. A circuit board 412 is arranged inside the sensing component 41. An air chamber sleeve 411 is installed on the circuit board 412. A sealing disc 413 is fixed at the bottom of the air chamber sleeve 411. At least one sensor 414 is installed on the sealing disc 413, and a tuning fork sensor 415 is arranged between the sensors 414.

[0021] Furthermore, the sensor 414 is divided into high-precision pressure, temperature, and density sensors, which can monitor the parameter values in real time, and use the liquid crystal display screen to output and display data such as normal temperature pressure value, temperature value, P20 pressure value, density value, SF6 and N2 mixing ratio, etc.

[0022] [0022 Further, at least two sensors need to be added in the on-line monitoring device 1, one is a thermal conductivity sensor and the other is a dual pressure sensor. Among them, the dual pressure sensor realizes redundant measurement, automatically corrects systematic errors, improves measurement accuracy, and improves system safety.

[0023] Further, to ensure data reliability, the thermal conductivity sensor is periodically started, compared with the data of the tuning fork sensor 415, and the detected data is comprehensively judged and corrected by combining historical data and factors such as ambient temperature and pressure.

[0024] Further, the tuning fork sensor 415 realizes detection by using the vibration frequency difference caused by SF6 gas with different mixing ratios; the tuning fork sensor 415 does not require gas flow during the detection process, can realize static mixing ratio detection, and omits the tail gas treatment link caused by the need to sample the gas for detection, improving the on-site adaptability of the device.

[0025] Further, the tuning fork sensor 415 adopts a three-terminal lithium niobate tuning fork. The two U-shaped electrodes of the tuning fork are divided into E1 and E2. E1 and E2 are embedded inside the lithium niobate piezoelectric ceramic tuning fork as the excitation electrode and the sensing electrode. The outer exposed surface of the tuning fork is simultaneously plated with another metal electrode E3 as the current collector of the working electrode participating in the electrochemical process. Piezoelectric material lithium niobate is filled between the electrodes. After an alternating voltage is applied between E1 and E3, the piezoelectric material expands and contracts, driving the tuning fork to vibrate. The inverse piezoelectric signal of the forced vibration is collected between E2 and E3. Since the damping of the tuning fork in different media is different, relevant parameters such as gas density and concentration of the gaseous environment where the tuning fork is located can be inferred from the spectral density of the tuning fork vibration, and then the accuracy of the mixing ratio of SF6 and N2 can be judged.

[0026] Further, clicking the black button below the liquid crystal screen 2 in the on-line monitoring device 1 can switch and display among three display interfaces (traditional dial interface, numerical display interface, curve interface).

[0027] Further, the on-line monitoring device 1 can upload data to the background through the RS485 wired communication method; it can be networked wirelessly, and the data is aggregated to the node and then uploaded to the secondary platform; and it has a 4G transmission function, which can transmit the real-time monitoring data of the device to the handheld terminal. The signal acquisition between different devices is hierarchical and independent of each other.

[0028] The specific working principle is as follows: In the present invention, the on-line monitoring device 1 is installed on the GIS device and connected by the connecting pipe 45 in the connecting device 4. The seven-star junction box 5 and the wire harness connector 6 on one side respectively complete the corresponding wire harness connections. Under the operation of the liquid crystal screen 2, the on-line monitoring device 1 works. A storage battery is placed in the battery cover 7 on the rear shell 12 of the instrument for temporary power supply during power outage. The temperature control device 3 is turned on synchronously with the on-line monitoring device 1 to automatically match the on-line monitoring device 1 with the external temperature, so that it always maintains the optimal temperature state suitable for GIS detection. After the on-line monitoring device 1 is installed, the SF6 and N2 mixed gas is collected in the connecting pipe 45 in cooperation with the sealing disc 413 and the air chamber sleeve 411. With the assistance of the tuning fork sensor 415, the tuning fork sensor 415 judges according to the solubility of different mixed gases, thereby forming a vibration frequency difference to achieve detection. At the same time, the independent high-precision pressure, temperature, and density sensors in the sensor 414 monitor and collect data in real time. Subsequently, the thermal conductivity sensor is periodically started, compared with the data of the tuning fork sensor 415, and combined with historical data and environmental temperature, pressure and other factors for comprehensive research and judgment and correction of the detection data, so as to realize the on-line monitoring of the mixing ratio of the high-precision mixed gas.

[0029] A further solution is as follows: As shown in the attached Figure 7 to the attached Figure 10 figures: Among them, an outer cover 31 is provided in the temperature control device 3. A rear support platform 34 is fixed on the outer wall of the outer cover 31. A control screen 32 is installed on the surface of the rear support platform 34. A thermometer 33 is arranged below the control screen 32. A filter screen plate 35 is installed on the side wall of the outer cover 31. A water guide pipe 36 is installed at the bottom of the outer cover 31. A shell inner cavity 311 is opened in the outer cover 31. Side sliding frames 312 are installed on both sides of the inner wall of the shell inner cavity 311. A temperature control component 313 is erected between the side sliding frames 312. A plurality of locking ears 314 are fixed on the inner wall of the shell inner cavity 311. A control box 315 is installed below the temperature control component 313. A sliding beam 3121 is arranged in the side sliding frame 312. An auxiliary sliding groove 3122 is opened on the sliding beam 3121. A slider 3125 is installed in the auxiliary sliding groove 3122. A through hole 3123 is opened on the sliding beam 3121. A limit pin 3124 passes through the through hole 3123. A fixing frame 3131 is arranged in the temperature control component 313. A plurality of refrigeration sheets 3133 are installed on the surface of the fixing frame 3131. A plurality of temperature sensors 3132 are installed above the refrigeration sheets 3133. A plurality of water guide blocks 3135 are installed below the refrigeration sheets 3133. A water guide groove 3134 is opened on the fixing frame 3131. A drainage groove 3136 is arranged below the water guide groove 3134. A plurality of heating sheets 3137 are installed on the rear surface of the fixing frame 3131. An exhaust fan 3138 is arranged in front of the heating sheets 3137.

[0030] Furthermore, at least two cooling plates 3133 are provided, and temperature sensing is completed through the cooperation of the temperature sensor 3132. When it is triggered, the built-in exhaust fan 3138 continues to work behind the fixing frame 3131 to complete the cooling work of the online monitoring device 1.

[0031] Furthermore, at least four heating plates 3137 are provided, and the heating plates 3137 are triggered through the cooperation of the temperature sensor 3132 and the control box 315. When heating is required, the overall temperature of the online monitoring device 1 increases, reducing the temperature difference between the online monitoring device 1 and the external environment.

[0032] Furthermore, the water guide block 3135 is configured as two pieces in an arc shape, embedded in the surface of the fixing frame 3131 and below the cooling plate 3133, to receive and guide the condensed water, allowing the condensed water to fall into the water guide groove 3134 and be discharged externally in cooperation with the drainage groove 3136.

[0033] Furthermore, the control box 315 is mainly controlled by an external control panel 32, and the internal temperature is displayed on a temperature gauge 33, which cooperates with a temperature sensor 3132 on a fixed frame to interlock with a cooling plate 3133 or a heating plate 3137 respectively.

[0034] The specific working principle is as follows: In the present invention, when the online monitoring device 1 is in operation, the control panel 32 on the temperature control device 3 is turned on, the temperature gauge 33 displays the corresponding temperature during operation, and the exhaust fan 3138 in the outer cover shell 31 continues to work, and cooperates with the filter plate 35 installed on the lock ear 314 to block dust, so that the temperature sensor 3132 senses the external temperature after the air is inhaled, and the temperature signal measured by the temperature sensor 3132 is sent to the control box 315, and the control box 315 controls the opening of the cooling plate 3133 or the heating plate 3137. When the cooling plate 3133 is turned on, the temperature of the air coming in from the outside is reduced, and under the action of the exhaust fan 3138, the cold air is input into the side slot 11 of the device to achieve the overall control of the online monitoring device 1. Cooling effect, and the condensed water generated during the cooling process falls on the water guide block 3135, cooperates with the water guide groove 3134, enters the drainage groove 3136, and is discharged from the water guide pipe 36. When the temperature sensor 3132 senses that the external temperature is low, the heating plate 3137 performs indirect temperature compensation on the online monitoring device 1, and after self-heating, cooperates with the exhaust fan 3138 to complete the heating of the online monitoring device 1. When it is used for a certain period of time or the structure on the fixed frame 3131 needs to be repaired and maintained, the limit pin 3124 is pulled out of the through hole 3123, and the slider 3125 is moved in the auxiliary slide groove 3122 on the slide beam 3121, and it is moved out of the outer cover shell 31 as a whole for subsequent repair and maintenance work.

Claims

1. An on-line monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas, characterized in that, It includes an on-line monitoring device (1), on the surface of which a liquid crystal display screen (2) is installed. On one side of the on-line monitoring device (1), a temperature control device (3) is installed, and on the other side, a seven-star junction box (5) is installed. A wire harness connector (6) is arranged beside the seven-star junction box (5). A connecting device (4) is installed at the bottom of the on-line monitoring device (1), and a battery cover (7) is installed behind the on-line monitoring device (1). A sensing component (41) is arranged inside the connecting device (4). A circuit board (412) is arranged inside the sensing component (41). An air chamber sleeve (411) is installed on the circuit board (412). A sealing disc (413) is fixed at the bottom of the air chamber sleeve (411). At least one sensor (414) is installed on the sealing disc (413). A tuning fork sensor (415) is arranged between the sensors (414).

2. The online monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas according to claim 1, characterized in that: An instrument rear shell (12) is arranged inside the on-line monitoring device (1). A device side groove (11) is formed in the side wall of the on-line monitoring device (1). An antenna (43) is installed on the sensing component (41). A slot is arranged beside the antenna (43), and a main board (42) is installed on the slot. A connecting pipe (45) is arranged below the sensing component (41).

3. The on-line monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas according to claim 2, wherein: The connecting pipe (45) is connected to the air chamber sleeve (411). The sealing disc (413) is arranged between the connecting pipe (45) and the air chamber sleeve (411). The sensors (414) and the tuning fork sensor (415) are both arranged inside the connecting pipe (45). The circuit board (412) is electrically matched with the antenna (43) and the slot (44) respectively.

4. The on-line monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas according to claim 2, characterized in that: The sensors (414) and the tuning fork sensor (415) are electrically matched with the circuit board (412). The instrument rear shell (12) is bolted to the battery cover (7). A storage battery is placed in the space at the rear of the battery cover (7). The main board (42) is matched with the liquid crystal display screen (2). The connecting pipe (45) penetrates out of the on-line monitoring device (1).

5. The on-line monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas according to claim 1, characterized in that: An outer cover shell (31) is arranged inside the temperature control device (3). A rear support platform (34) is fixed on the outer wall of the outer cover shell (31). A control screen (32) is installed on the surface of the rear support platform (34). A thermometer (33) is arranged below the control screen (32). A filter screen plate (35) is installed on the side wall of the outer cover shell (31). A water guide pipe (36) is installed at the bottom of the outer cover shell (31).

6. The on-line monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas according to claim 5, characterized in that: A shell inner cavity (311) is formed inside the outer cover shell (31). Side sliding frames (312) are installed on both sides of the inner wall of the shell inner cavity (311). A temperature control component (313) is arranged between the side sliding frames (312). A plurality of locking ears (314) are fixed on the inner wall of the shell inner cavity (311). A control box (315) is installed below the temperature control component (313).

7. The on-line monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas according to claim 6, characterized in that: A fixing frame (3131) is arranged inside the temperature control component (313). A plurality of refrigeration chips (3133) are mounted on the surface of the fixing frame (3131). A temperature sensor (3132) is mounted above the refrigeration chips (3133). A plurality of water guiding blocks (3135) are mounted below the refrigeration chips (3133). A water guiding groove (3134) is formed in the fixing frame (3131). A drain groove (3136) is arranged below the water guiding groove (3134). A plurality of heating sheets (3137) are mounted on the rear surface of the fixing frame (3131). An exhaust fan (3138) is arranged in front of the heating sheets (3137).

8. The on-line monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas according to claim 7, characterized in that: The exhaust fan (3138) faces the device side groove (11). Both the heating sheets (3137) and the refrigeration chips (3133) are electrically cooperated with the control box (315). The temperature control box (315) is electrically cooperated with the temperature sensor (3132). The drain groove (3136) is arranged below the water guiding groove (3134). The drain groove (3136) is connected to the water guiding pipe (36). The filter screen plate (35) is bolted to the locking ears (314). The exhaust fan (3138) is electrically cooperated with the control box (315). Both sides of the fixing frame (3131) are connected to the side sliding frame (312).

9. The on-line monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas according to claim 8, characterized in that: A sliding beam (3121) is arranged inside the side sliding frame (312). An auxiliary sliding groove (3122) is formed in the sliding beam (3121). A slider (3125) is mounted in the auxiliary sliding groove (3122). A through hole (3123) is formed in the sliding beam (3121). A limit pin (3124) penetrates through the through hole (3123).

10. The online monitoring device for the mixing ratio of nitrogen and sulfur hexafluoride mixed gas according to claim 9, characterized in that: The limit pin (3124) is arranged in front of the slider (3125). The slider (3125) is in sliding fit with the auxiliary sliding groove (3122). The sliding beam (3121) is fixed to the inner wall of the shell inner cavity (311). The outer wall of the slider (315) is fixed to the outer wall of the fixing frame (3131).

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