Visual fluid temperature and pressure sensor for low-oil equipment

Abstract

According to the visual fluid temperature and pressure sensor for the low-oil equipment, the pressure assembly is arranged to monitor oil temperature and oil pressure and read oil temperature and oil pressure data to the display screen, visual observation is achieved, wireless data transmission is achieved, online monitoring is achieved, accidents are effectively avoided, and the operation reliability of the low-oil equipment is improved; the device comprises a shell, an antenna, a circuit board, a power supply, a three-way valve, a display screen, a backboard and a pressure assembly, the circuit board is arranged in the shell, one side of the shell is provided with an antenna interface, the antenna interface is provided with the antenna, the other side of the shell is provided with an access power supply, and the output end of the power supply is connected with the circuit board; a pressure assembly is arranged at the bottom of the shell, the output end of the pressure assembly is connected with the circuit board, and a three-way valve is installed at the bottom of the pressure assembly. A back plate is arranged on the back face of the shell and fixedly connected with the three-way valve through bolts, and a display screen is arranged at the front end of the shell and electrically connected with the circuit board.

Description

Technical Field

[0001] The present invention relates to the technical field of power monitoring systems, and particularly to a visual fluid temperature and pressure sensor for oil-minimum equipment. Background Art

[0002] Oil-minimum equipment is an important part of the power system and plays an indispensable role in the power system. For example, oil-minimum equipment such as transformer bushings and instrument transformers are one of the main equipment in the power system and play a crucial role in the power system. Their reliability directly affects the operation safety of transformers and the power grid. In recent years, abnormal events of oil-minimum equipment failures, due to timely discovery, did not cause major power grid accidents, otherwise the consequences would be unimaginable. Therefore, it is urgent to carry out on-line monitoring of oil-minimum equipment. Due to the special structure of high-voltage bushings and oil-immersed current transformers, there are almost no targeted effective live detection or on-line monitoring means at present. If a simple and effective on-line monitoring method can be adopted to timely detect defects before a failure and take effective measures, major accidents can be avoided.

[0003] When internal discharges or thermal faults occur in high-voltage bushings and current transformers, oil and paper will decompose to generate gases. When the gases exceed the solubility of the oil, the fault gases of the high-voltage bushing will accumulate at the oil storage tank at the head of the bushing, increasing the internal pressure of the bushing. Therefore, it is considered to install a pressure sensor device at the sampling valve of the grounding flange of the high-voltage bushing to realize real-time monitoring of the internal pressure of the high-voltage bushing, and timely take effective measures to avoid the occurrence of high-voltage bushing faults; the fault gases of the current transformer will accumulate at the bellows expander of the current transformer, increasing the internal pressure of the current transformer. By real-time monitoring the internal oil and gas pressure of the current transformer, when the pressure exceeds a certain limit, an alarm signal is sent, and effective measures are taken in time, the defects can be eliminated in the bud, effectively avoiding accidents and greatly improving the operation reliability of power grid equipment.

[0004] During the inspection process, on-site maintenance personnel need to read the indication display of oil temperature and oil pressure in the first time. Therefore, it is necessary to develop a visual on-line monitoring device for oil temperature and oil pressure suitable for oil-minimum equipment, and realize the functions of oil pressure, temperature, acquisition, analysis and alarm, effectively avoiding accidents and improving the operation reliability of power grid equipment. Summary of the Invention

[0005] The present invention aims at the technical defects of the existing technology, and discloses a visual fluid temperature and pressure sensor for oil-minimum equipment, which sets a pressure component to monitor oil temperature and oil pressure, reads the oil temperature and oil pressure data to a display screen, realizes visual observation, and wirelessly transmits data to send for on-line monitoring, effectively avoiding accidents and improving the operation reliability of oil-minimum equipment.

[0006] The present invention provides the following technical solution: a visual fluid temperature and pressure sensor for oil-poor equipment, comprising a housing, an antenna, a circuit board, a power supply, a three-way valve, a display screen, a back plate, and a pressure assembly. Among them, the circuit board is arranged inside the housing, an N-head is provided on one side of the housing, the N-head is connected to an antenna adapter, the antenna is installed on the antenna adapter, a power supply is connected on the other side of the housing, and the output end of the power supply is connected to the circuit board; a pressure assembly is provided at the bottom of the housing, the output end of the pressure assembly is connected to the circuit board, and a three-way valve is installed at the bottom of the pressure assembly; a back plate is provided on the back of the housing, the back plate and the three-way valve are fixedly connected by bolts, a display screen is provided at the front end of the housing, and the display screen is electrically connected to the circuit board.

[0007] Preferably, the pressure assembly includes a pressure housing, an oil temperature and oil pressure sensor, and a retaining ring. The oil temperature and oil pressure sensor is fixed to the upper inner side of the pressure housing through the retaining ring.

[0008] Preferably, a rain shield is provided on the upper side of the housing. One side of the rain shield is arc-shaped in the middle, a first connection hole is provided on the upper side of the rain shield, an extension plate is provided on the other side of the rain shield, the included angle between the extension plate and the rain shield is an obtuse angle, and a groove for the antenna to pass through is provided near one end of the rain shield where the antenna is located; retaining ring grooves are provided on both sides of the back plate, grounding holes are provided at the bottom of both sides of the back plate, a second connection hole is provided on the upper side of the back plate, the rain shield and the back plate are fixedly connected by bolts through the first connection hole and the second connection hole, a fixing hole for fixing the three-way valve is provided at the lower part of the back plate, and a circular opening is provided at the upper part of the back plate.

[0009] Preferably, the three-way valve includes a three-way valve body, a union nut, a knob switch, an oil drain valve, a sampling valve, mounting ears, and mounting holes. Mounting ears are provided on both sides of the three-way valve body, mounting holes are provided on the mounting ears, a union nut is provided at the upper part of the three-way valve body for connecting the pressure assembly, a sampling valve is provided at the lower part of the three-way valve body, an oil drain valve is provided on one side of the three-way valve body, a knob switch is provided at the front end of the three-way valve body, and the three-way valve is fixed to the back plate through the mounting ears.

[0010] Preferably, the access power supply supplies power to a battery pack. The battery pack includes a solar panel, a box body, a rechargeable battery, a debugging port, and a power switch. The housing is connected to the battery pack through an adapter. The solar panel is electrically connected to the rechargeable battery. The output end of the rechargeable battery is connected to the circuit board. A debugging port and a power switch are provided at the bottom of the box body, and the debugging port is a 6-core aviation plug.

[0011] Preferably, the display screen is an LED screen.

[0012] Preferably, the access power supply is AC220V. A adapter is provided on the side of the housing where the power supply is connected. The adapter is connected to a Hirschmann connector group, and the AC220V power supply is connected through the Hirschmann connector group for power supply.

[0013] Preferably, the display screen is a digital tube.

[0014] Preferably, the circuit board includes an MCU control module, a LORA wireless communication module, a switching power supply circuit module, a storage EEPROM module, a charging management module, a read-write pressure and temperature module, and a debugging serial port module; the MCU control module uses the LoRa 490MHz wireless frequency band to interact with the LORA wireless communication module through SPI, and the LORA wireless communication module forwards the data of the oil temperature and oil pressure sensor to the repeater through wireless transmission; the charging management module is inserted into the charging management circuit interface through the output end of the solar panel to charge the rechargeable battery.

[0015] Preferably, the circuit board includes an MCU control module, a LORA wireless communication module, a switching power supply circuit module, a storage EEPROM module, a power supply management module, and a read-write pressure and temperature module; the MCU control module uses the LoRa 490MHz wireless frequency band to interact with the LORA wireless communication module through SPI, and the LORA wireless communication module forwards the data of the oil temperature and oil pressure sensor to the repeater through wireless transmission; the power supply management module converts AC220V into DC5V through a power conversion circuit to supply power to the visual fluid temperature and pressure sensor for oil-less equipment.

[0016] Compared with the prior art, the beneficial effects of the present invention are: In the above technical solution, the visual fluid temperature and pressure sensor for oil-less equipment includes a housing, an antenna, a circuit board, a power supply, a three-way valve, a display screen, a back plate, and a pressure component. Among them, the circuit board is arranged inside the housing, an N-head is provided on one side of the housing, the N-head is connected to an antenna adapter, and the antenna is installed on the antenna adapter. A power supply is provided on the other side of the housing, and the output end of the power supply is connected to the circuit board; a pressure component is provided at the bottom of the housing, the output end of the pressure component is connected to the circuit board, and a three-way valve is installed at the bottom of the pressure component; a back plate is provided on the back of the housing, the back plate is fixedly connected to the three-way valve by bolts, a display screen is provided at the front end of the housing, and the display screen is electrically connected to the circuit board; The present invention discloses a visual fluid temperature and pressure sensor for oil-less equipment. This device organically combines mechanical structure and electrical monitoring, realizing integrated on-line monitoring of oil temperature and oil pressure. It has a compact structure and is easy to install. The drain valve of the oil-less equipment is connected to the lower transfer pipe and tightened with the sampling valve at the lower end of the three-way valve to ensure tightness. The three-way valve is also designed with a drain valve for on-site sampling, which has little impact on the maintenance site and does not affect the normal operation of the original equipment. The device monitors the oil temperature and oil pressure through a pressure component, reads the oil temperature and oil pressure data to the display screen, realizes visual observation and wirelessly transmits the data to the repeater, achieving on-line monitoring of the oil temperature and oil pressure data. The back of the shell is provided with a back plate for installation on the oil-less equipment. Visual observation during on-site inspection can be carried out simultaneously with on-line monitoring at the platform end, effectively avoiding accidents and improving the operation reliability of the oil-less equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of a specific embodiment of the present invention; Figure 2 is Figure 1 a partial schematic diagram from another angle of Figure 3 is a structural schematic diagram of the rain shield; Figure 4 is a structural schematic diagram of the back plate; Figure 5 is a structural schematic diagram of the three-way valve; Figure 6 is a structural schematic diagram of the pressure component; Figure 7 is Figure 6 a structural schematic diagram of the medium pressure ring in Figure 8 is a structural schematic diagram of the battery box group; Figure 9 is a structural schematic diagram of the shell; Figure 10 is a three-dimensional structural schematic diagram of another specific embodiment of the present invention; Figure 11 is a structural schematic diagram of the Hirschmann connector group.

[0018] DESCRIPTION OF THE REFERENCE NUMERALS: 1. Antenna; 2. Rain shield; 3. Back plate; 4. Battery box group; 5. Display screen; 6. Shell; 7. Pressure component; 8. Three-way valve; 9. Hirschmann connector group; 10. Adapter. 101. Antenna adapter; 102. N connector. 201. Extension plate; 202. First connection hole. 301. Hoop groove; 302. Grounding hole; 303. Fixing hole; 304. Second connection hole. 401, Solar panel; 402, Debugging port; 403, Power switch; 601, Front cover; 602, Housing; 603, Rear cover; 701, Compression ring; 702, Pressure housing; 801, Knob switch; 802, Oil drain valve; 803, Sampling valve; 804, Union nut; 805, Mounting ear; 806, Mounting hole; 807, Three-way valve body. Specific implementation manner

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] The present invention discloses a visual fluid temperature and pressure sensor for oil-less equipment. This technical solution designs a visual on-line monitoring of oil temperature and oil pressure for oil-less equipment. Specifically, a pressure component 7 is used to monitor the oil temperature and oil pressure, and the oil temperature and oil pressure data are read into a display screen 5 to achieve visual observation and wirelessly transmit the data to a repeater, realizing on-line monitoring of the oil temperature and oil pressure data. The design of the three-way valve 8 enables oil sampling without affecting the structure of the oil-less equipment. The power supply powers the entire device, the antenna 1 is used for transmitting and receiving signals to achieve wireless communication, and the backplane 3 is designed to fix the device. The present invention realizes visual on-line monitoring of the oil temperature and oil pressure of oil-less equipment and is easy to install, having significant technical advantages.

[0021] A specific implementation manner of the present invention, a visual fluid temperature and pressure sensor for oil-less equipment, such as Figures 1 to 9As shown in the figure, it includes a housing 6, an antenna 1, a circuit board, a power supply, a three-way valve 8, a display screen 5, a backplane 3, and a pressure component 7. Among them, a circuit board is arranged inside the housing 6. An N-type connector 102 is provided on one side of the housing 6, and the N-type connector 102 is connected to an antenna adapter 101. The antenna 1 is installed on the antenna adapter 101. A power supply is connected on the other side of the housing 6, and the output end of the power supply is connected to the circuit board; a pressure component 7 is provided at the bottom of the housing 6, the output end of the pressure component 7 is connected to the circuit board, and a three-way valve 8 is installed at the bottom of the pressure component 7;A back plate 3 is provided on the back of the outer shell 6. The back plate 3 is fixedly connected to the three-way valve 8 by bolts. A display screen 5 is provided at the front end of the outer shell 6. The display screen 5 is electrically connected to the circuit board. The pressure assembly 7 includes a pressure outer shell 702, an oil temperature and oil pressure sensor, and a retaining ring 701. The oil temperature and oil pressure sensor is fixed to the upper inner side of the pressure outer shell 702 by the retaining ring 701. A rain shield 2 is provided on the upper side of the outer shell 6. One side of the rain shield 2 is arc-shaped in the middle. A first connection hole 202 is provided on the upper side of the rain shield 2. An extension plate 201 is provided on the other side of the rain shield 2. The included angle between the extension plate 201 and the rain shield 2 is an obtuse angle. A groove for the antenna 1 to pass through is provided at one end of the rain shield 2 close to the antenna 1. Hoop grooves 301 are provided on both sides of the back plate 3. Grounding holes 302 are provided at the bottom of both sides of the back plate 3. A second connection hole 304 is provided on the upper side of the back plate 3. The rain shield 2 and the back plate 3 are bolt-fixed through the first connection hole 202 and the second connection hole 304. A fixing hole 303 for fixing the three-way valve 8 is provided at the lower part of the back plate 3. A circular opening is provided at the upper part of the back plate 3. The three-way valve 8 includes a three-way valve body 807, a union nut 804, a knob switch 801, an oil drain valve 802, a sampling valve 803, mounting ears 805, and mounting holes 806. Mounting ears 805 are provided on both sides of the three-way valve body 807. Mounting holes 806 are provided on the mounting ears 805. A union nut 804 is provided at the upper part of the three-way valve body 807 for connecting the pressure assembly 7. A sampling valve 803 is provided at the lower part of the three-way valve body 807. An oil drain valve 802 is provided on one side of the three-way valve body 807. A knob switch 801 is provided at the front end of the three-way valve body 807. The three-way valve 8 is fixed to the back plate 3 through the mounting ears 805. The access power supply supplies power to the battery pack 4. The battery pack 4 includes a solar panel 401, a box body, a rechargeable battery, a debugging port 402, and a power switch 403. The outer shell 6 is connected to the battery pack 4 through an adapter 10. The solar panel 401 is electrically connected to the rechargeable battery. The output end of the rechargeable battery is connected to the circuit board. The debugging port 402 and the power switch 403 are provided at the bottom of the box body. The debugging port 402 is a 6-core aviation plug. The display screen 5 is an LED screen. The circuit board includes an MCU control module, a LORA wireless communication module, a switching power supply circuit module, a storage EEPROM module, a charging management module, a reading and writing pressure and temperature module, and a debugging serial port module. The MCU control module uses the LoRa 490MHz wireless frequency band to interact with the LORA wireless communication module through SPI. The LORA wireless communication module forwards the data of the oil temperature and oil pressure sensor to the repeater through wireless transmission. The charging management module charges the rechargeable battery by inserting the output end of the solar panel 401 into the charging management circuit interface.;

[0022] The structural features of this embodiment are as follows: The present invention organically combines a mechanical structure and electrical monitoring, achieving an integrated on-line monitoring of oil temperature and oil pressure. Its structure is compact and easy to install. The drain valve 802 of the oil-minimizing equipment is connected to the downward pipe and tightened with the sampling valve 803 at the lower end of the three-way valve 8 to ensure tightness. The three-way valve 8 is also designed with a drain valve 802 for on-site sampling, which has little impact on the maintenance site and does not affect the normal operation of the original equipment.

[0023] As Figure 9 shown, the housing 6 includes a front cover 601, a housing 602, and a rear cover 603. The design of the back plate 3 is used to fix the device on the oil-minimizing equipment, usually at the sampling valve 803 of the grounding flange of the high-voltage bushing. The main components of this device are the pressure assembly 7. Among them, the oil temperature and oil pressure sensor realizes the real-time monitoring of the oil temperature and oil pressure inside the high-voltage bushing. The pressure ring 701 is used to fix the oil temperature and oil pressure sensor. The oil temperature and oil pressure sensor transmits the data to the circuit board and reads and writes it to the display screen 5 through the pressure and temperature interfaces, which is convenient for the inspection personnel to observe on-site. Oil-minimizing equipment is generally installed outdoors, and waterproof and rainproof measures need to be considered for outdoor installation. The design of the rain cover 2 effectively protects the device from weather effects such as rain, immersion, and fog erosion, keeping it in a stable and safe state all the time. The arc design of the rain cover 2 is to adapt to a fixed angle, and the back plate 3 has the same arc. The extension plate 201 is set at an obtuse angle with the rain cover 2, preferably with an angle of 135 degrees for the extension plate 201 design, so that the rain cover 2 can better block rainwater and prevent rainwater from directly entering the cover and affecting the safe operation of the device. There is a groove where the antenna 1 passes through. The rain cover 2 is installed on the upper side of the back plate 3. There are hoop grooves 301 on the back plate 3. Preferably, 3 groups of hoop grooves 301 are used on-site to fix the device on the oil-minimizing equipment through hoops. There is a grounding hole 302 at the bottom of the back plate 3 for the installation of the grounding wire, enabling the device to be effectively grounded to ensure the safety of the device and personnel. A circular opening is provided on the back plate 3 to reduce the weight of the device without affecting its function. The three-way valve 8 is installed without touching the main body of the oil-minimizing equipment. The drain valve 802 of the oil-minimizing equipment is connected to the downward pipe and tightened with the sampling valve 803 at the lower end of the three-way valve 8. When oil samples are needed on-site, turn off the rotary switch to disconnect the pipeline from this device for sampling. After sampling, turn on the rotary switch and the device works normally. This device is sustainably powered by a solar panel and does not require on-site power access. The battery is divided into a main component and a spare component, and the main and spare components can be switched according to the situation. Due to the use of solar power, an LED screen is preferably used, which is energy-saving and power-saving. It realizes on-line monitoring of oil temperature and oil pressure with wireless and passive visualization on-site, effectively avoiding accidents and improving the operation reliability of oil-minimizing equipment.

[0024] Another specific embodiment of the present invention is a visible fluid temperature and pressure sensor for oil-minimizing equipment. As Figures 3 to 11As shown in the figure, it includes a housing 6, an antenna 1, a circuit board, a power supply, a three-way valve 8, a display screen 5, a backplane 3, and a pressure assembly 7. Among them, a circuit board is arranged inside the housing 6. An N-type connector 102 is provided on one side of the housing 6, and the N-type connector 102 is connected to an antenna adapter 101. The antenna 1 is installed on the antenna adapter 101. A power supply is connected on the other side of the housing 6, and the output end of the power supply is connected to the circuit board; a pressure assembly 7 is provided at the bottom of the housing 6, the output end of the pressure assembly 7 is connected to the circuit board, and a three-way valve 8 is installed at the bottom of the pressure assembly 7;A back plate 3 is provided on the back of the housing 6. The back plate 3 is fixedly connected to the three-way valve 8 by bolts. A display screen 5 is provided at the front end of the housing 6. The display screen 5 is electrically connected to the circuit board. The pressure assembly 7 includes a pressure housing 702, an oil temperature and oil pressure sensor, and a retaining ring 701. The oil temperature and oil pressure sensor is fixed to the upper inner side of the pressure housing 702 by the retaining ring 701. A rain shield 2 is provided on the upper side of the housing 6. One side of the rain shield 2 is arc-shaped in the middle. A first connection hole 202 is provided on the upper side of the rain shield 2. An extension plate 201 is provided on the other side of the rain shield 2. The included angle between the extension plate 201 and the rain shield 2 is an obtuse angle. A groove for the antenna 1 to pass through is provided at one end of the rain shield 2 close to the antenna 1. Hoop grooves 301 are provided on both sides of the back plate 3. Grounding holes 302 are provided at the bottom of both sides of the back plate 3. A second connection hole 304 is provided on the upper side of the back plate 3. The rain shield 2 and the back plate 3 are bolt-fixed through the first connection hole 202 and the second connection hole 304. A fixing hole 303 for fixing the three-way valve 8 is provided at the lower part of the back plate 3. A circular opening is provided at the upper part of the back plate 3. The three-way valve 8 includes a three-way valve body 807, a union nut 804, a knob switch 801, an oil drain valve 802, a sampling valve 803, mounting ears 805, and mounting holes 806. Mounting ears 805 are provided on both sides of the three-way valve body 807. Mounting holes 806 are provided on the mounting ears 805. A union nut 804 is provided at the upper part of the three-way valve body 807 for connecting the pressure assembly 7. A sampling valve 803 is provided at the lower part of the three-way valve body 807. An oil drain valve 802 is provided on one side of the three-way valve body 807. A knob switch 801 is provided at the front end of the three-way valve body 807. The three-way valve 8 is fixed to the back plate 3 through the mounting ears 805. The access power supply is AC220V. A connector 10 is provided on one side of the housing 6 connected to the power supply. The connector 10 is connected to a Hirschmann connector group 9. The AC220V power supply is connected to the power supply through the Hirschmann connector group 9. The display screen 5 is a digital tube. The circuit board includes an MCU control module, a LORA wireless communication module, a switching power supply circuit module, a storage EEPROM module, a power supply management module, and a read-write pressure and temperature module. The MCU control module uses the LoRa 490MHz wireless frequency band to interact with the LORA wireless communication module through SPI. The LORA wireless communication module forwards the data of the oil temperature and oil pressure sensor to the repeater through wireless transmission. The power supply management module converts AC220V into DC5V through a power conversion circuit to supply power to the visual fluid temperature and pressure sensor for oil-immersed equipment.;

[0025] The structural features of this embodiment are as follows: This embodiment discloses an on-line visual monitoring of oil temperature and oil pressure for on-site power supply, generally AC220V at the site and wireless active on-site, which can effectively avoid accidents and improve the operation reliability of oil-minimum equipment. It is generally used on oil-immersed current transformers. Since there is AC220V on-site, the device uses a Hirschmann connector set 9 for wiring. The on-site AC220V power supply is converted into DC5V through a power conversion circuit to supply power to the visual fluid temperature and pressure sensor for oil-minimum equipment. For on-site power supply, a digital tube is selected as the display screen 5, which consumes power but has a clear display effect.

[0026] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention. These changes involve related technologies well-known to those skilled in the art, and all of them fall within the protection scope of the present invention patent.

[0027] Many other changes and modifications can be made without departing from the concept and scope of the present invention. It should be understood that the present invention is not limited to specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. Visual fluid temperature and pressure sensor for oil-poor equipment, characterized in that: The invention comprises a housing (6), an antenna (1), a circuit board, a power supply, a three-way valve (8), a display screen (5), a back panel (3), and a pressure assembly (7), wherein the circuit board is arranged inside the housing (6), an N-head (102) is arranged on one side of the housing (6), the N-head (102) is connected to an antenna adapter (101), the antenna (1) is mounted on the antenna adapter (101), and an access power supply is arranged on the other side of the housing (6), the output end of the power supply is connected to the circuit board; A pressure assembly (7) is provided at the bottom of the housing (6); an output end of the pressure assembly (7) is connected to a circuit board; and a three-way valve (8) is installed at the bottom of the pressure assembly (7); A back plate (3) is provided on the back of the housing (6), and the back plate (3) is fixedly connected to the three-way valve (8) by means of bolts. A display screen (5) is provided on the front end of the housing (6), and the display screen (5) is electrically connected to the circuit board.

2. The visual fluid temperature and pressure sensor for low-oil equipment according to claim 1, characterized in that: The pressure assembly (7) comprises a pressure housing (702), an oil temperature and oil pressure sensor, and a pressing ring (701), wherein the oil temperature and oil pressure sensor is fixed to the upper inner portion of the pressure housing (702) via the pressing ring (701).

3. The visual fluid temperature and pressure sensor for low-oil equipment according to claim 2, characterized in that: A rain cover (2) is provided on the upper side of the housing (6), the middle of one side of the rain cover (2) is arc-shaped, a first connection hole (202) is provided on the upper side of the rain cover (2), an extension plate (201) is provided on the other side of the rain cover (2), the angle between the extension plate (201) and the rain cover (2) is an obtuse angle, and a groove for the antenna (1) to pass through is provided at one end of the rain cover (2) close to the antenna (1); Hoop grooves (301) are provided on both sides of the back plate (3), grounding holes (302) are provided on the bottom of both sides of the back plate (3), a second connection hole (304) is provided on the upper side of the back plate (3), the rain cover (2) and the back plate (3) are fixed by bolts via the first connection hole (202) and the second connection hole (304), a fixing hole (303) for fixing the three-way valve (8) is provided on the lower part of the back plate (3), and a circular opening is provided on the upper part of the back plate (3).

4. The visual fluid temperature and pressure sensor for low-oil equipment according to any one of claims 1 to 3, characterized in that: The three-way valve (8) comprises a three-way valve body (807), a union nut (804), a knob switch (801), an oil drain valve (802), a sampling valve (803), a mounting ear (805), and a mounting hole (806). The three-way valve body (807) is provided with mounting ears (805) on both sides, and the mounting ears (805) are provided with mounting holes (806). The upper part of the three-way valve body (807) is provided with a union nut (804) for connecting to a pressure assembly (7). The lower part of the three-way valve body (807) is provided with a sampling valve (803). The oil drain valve (802) is provided on one side of the three-way valve body (807). The front end of the three-way valve body (807) is provided with a knob switch (801). The three-way valve (88) is fixed to the back plate (3) via the mounting ears (805).

5. The visual fluid temperature and pressure sensor for low-oil equipment according to claim 4, characterized in that: The access power source supplies power to the battery box group (4); the battery box group (4) comprises a solar panel (401), a box body, a rechargeable battery, a debugging port (402), and a power switch (403); the housing (6) is connected to the battery box group (4) via an adapter (10); the solar panel (401) is electrically connected to the rechargeable battery; the output end of the rechargeable battery is connected to the circuit board; the bottom of the box body is provided with a debugging port (402) and a power switch (403); the debugging port (402) is a 6-core aviation plug.

6. The visual fluid temperature and pressure sensor for low-oil equipment according to claim 5, characterized in that: The display screen (5) is an LED screen.

7. The visual fluid temperature and pressure sensor for low-oil equipment according to claim 4, characterized in that: The access power source is AC220V, and a conversion joint (10) is provided on the side of the housing (6) connected to the power source, the conversion joint (10) is connected to a Hirschmann connector group (9), and the AC220V power source is connected to the power supply through the Hirschmann connector group (9).

8. The visual fluid temperature and pressure sensor for oil-poor equipment according to claim 7, characterized in that: The display screen (5) is a digital tube.

9. The visual fluid temperature and pressure sensor for low-oil equipment according to claim 6, characterized in that: The circuit board includes an MCU control module, a LORA wireless communication module, a switching power supply circuit module, a storage EEPROM module, a charging management module, a reading and writing pressure and temperature module, and a debugging serial port module; The MCU control module uses the LoRa490MHz wireless frequency band to exchange data with the LORA wireless communication module through SPI, and the LORA wireless communication module forwards the data of the oil temperature and oil pressure sensors to the repeater through wireless transmission; The charging management module is inserted into the charging management circuit interface through the output end of the solar panel (401) to charge the rechargeable battery.

10. The visual fluid temperature and pressure sensor for low-oil equipment according to claim 8, characterized in that: The circuit board includes an MCU control module, a LORA wireless communication module, a switching power supply circuit module, a storage EEPROM module, a power supply management module, and a reading and writing pressure and temperature module; The MCU control module uses the LoRa490MHz wireless frequency band to exchange data with the LORA wireless communication module through SPI, and the LORA wireless communication module forwards the data of the oil temperature and oil pressure sensors to the repeater through wireless transmission; The power supply management module converts AC220V into DC5V through a power conversion circuit to supply power to a visual fluid temperature and pressure sensor for low-oil equipment.

Images