Remote gas density relay

Abstract

The invention relates to the field of electric power technology, and discloses a remote gas density relay. The invention has the beneficial effect that the remote gas density relay can be applied to high-voltage and medium-voltage electrical equipment, has a very thin appearance, and can meet the needs of miniaturization and intelligence of electrical equipment. At the same time, the gas density of the electrical equipment can be accurately monitored to improve work efficiency.

Description

Technical Field

[0001] The invention relates to the field of electric power technology, and in particular to a high-performance thin-type remote gas density relay that can be applied to high-voltage or medium-voltage electrical equipment. Background Art

[0002] At present, SF6 (sulfur hexafluoride) electrical equipment has been widely used in the power sector and industrial and mining enterprises, promoting the rapid development of the power industry. In recent years, with the rapid development of the economy, the capacity of my country's power system has expanded dramatically, and the use and demand of SF6 electrical equipment has also increased. SF6 gas plays the role of arc extinguishing and insulation in high-voltage electrical equipment. The reduction of SF6 gas density in high-voltage electrical equipment will seriously affect the operation safety of SF6 high-voltage electrical equipment. When the SF6 gas density is further reduced to a certain extent, it will even lead to the loss of insulation and arc extinguishing performance in high-voltage electrical equipment.

[0003] As unmanned substations gradually develop towards networked and digitalized intelligent substations and the requirements for remote control and telemetry continue to increase, online monitoring of the gas density and micro-water content of SF6 electrical equipment also has important practical significance. With the continuous and vigorous development of China's smart grid and ubiquitous power Internet of Things, smart high-voltage electrical equipment, as an important component and key node of smart substations, plays a vital role in the safety of smart grids. Most high-voltage electrical equipment is currently SF6 gas-insulated equipment. If the gas density decreases (such as due to leakage, etc.), it will seriously affect the electrical performance of the equipment and cause serious hidden dangers to safe operation. At present, the practice of online monitoring of gas density values ​​in SF6 high-voltage electrical equipment has become very common, especially after the State Grid proposed the construction of ubiquitous power Internet of Things, the application of gas density monitoring systems (such as gas density relays) has begun to usher in a booming development. The current gas density monitoring system basically adopts: 1) The remote transmission SF6 gas density relay is used to realize the collection, upload and online monitoring of density, pressure and temperature. 2) The gas density transmitter is used to realize the collection, upload and online monitoring of density, pressure and temperature. The SF6 gas density relay is the core and key component of the gas density monitoring system. At present, the method of online monitoring of SF6 gas density value in SF6 electrical equipment has become very common. In order to use the remote SF6 gas density relay to realize the collection of density, pressure and temperature, the remote SF6 gas density relay is obviously the core and key component. However, as the appearance of high-voltage and medium-voltage electrical equipment is increasingly required to be miniaturized, this also puts forward new requirements for the appearance of the remote SF6 gas density relay. The appearance of the remote SF6 gas density relay needs to be very thin to meet the miniaturization and intelligence requirements of electrical equipment.

[0004] Existing remote gas density relays all have the disadvantage of being unable to meet the above requirements. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a remote gas density relay.

[0006] The remote gas density relay provided by the present invention comprises a mechanical part and an electronic part, wherein the mechanical part comprises a mechanical part housing, a base, a Baden tube, an end seat, a temperature compensation element, a signal generator for sending contact signals, a movement, a pointer, and a dial, and the electronic part comprises an electronic part housing, an intelligent processor, a power module, a pressure sensor, a temperature sensor, and a communication module; the intelligent processor is arranged in the electronic part and is respectively connected with the temperature sensor, the pressure sensor, and the communication module, the intelligent processor collects pressure signals through the pressure sensor, and the temperature sensor collects temperature signals, and obtains corresponding density values ​​after being processed by the intelligent processor, and remotely transmits the density value, pressure value, or temperature value through the communication module, the communication module is arranged at the electronic part housing or the mechanical part housing or is integrated with the intelligent processor, the base comprises a Baden tube welding groove, a sensor, and a power module. The base has a sensor placement hole and an air inlet interface, and the gas paths of the three are connected. One end of the Baden tube is welded to the Baden tube welding groove of the base, and the other end is welded to the end seat. The base is arranged at the bottom and / or the circumferential side of the mechanical part shell, the sensor placement hole of the base passes through or is exposed from the bottom back of the mechanical part shell, the pressure sensor is arranged in the sensor placement hole of the base and is connected with the Baden tube, and the base air inlet interface passes through or is exposed from the bottom back of the mechanical part shell or is arranged on the circumferential side of the mechanical part shell; the electronic part shell is arranged at the bottom back of the mechanical part shell, and the sensor placement hole of the base and / or the base air inlet interface are covered by the electronic part shell; or, the sensor placement hole of the base and / or the base air inlet interface pass into the electronic part shell; or, the sensor placement hole of the base and / or the base air inlet interface pass through or are exposed from the bottom back of the electronic part shell.

[0007] Preferably, the pressure sensor is sealed and fixed on the sensor placement hole of the base through an insulating member, and the housing of the pressure sensor and the base are insulated from each other.

[0008] Preferably, it also includes an insulating sealing transition piece, the pressure sensor is sealed in the sensor placement hole of the base through the insulating transition piece, the insulating sealing transition piece is sealed and fixed on the sensor placement hole of the base, the signal power line of the pressure sensor is connected to the insulating sealing transition piece, and the signal power line of the pressure sensor is connected to the intelligent processor through the insulating sealing transition piece.

[0009] Preferably, the temperature sensor is sealed in the sensor placement hole of the base, and the pressure sensor and the temperature sensor are integrated pressure-temperature sensors or density sensors.

[0010] Preferably, the insulating sealing transition piece is sealed with the sensor placement hole of the base through a sealing ring or a sealing gasket; or, the insulating sealing transition piece is sealed with the sensor placement hole of the base by welding on the sensor placement hole of the base; or, the insulating sealing transition piece is sealed with the sensor placement hole of the base through a sealing ring or a sealing gasket, and the insulating sealing transition piece is welded on the sensor placement hole of the base to form a double seal with the sensor placement hole of the base.

[0011] Preferably, the insulating and sealing transition piece comprises an insulating and sealing transition piece shell, an insulating and sealing transition piece lead pin and a sealing element which are sealed to each other.

[0012] Preferably, it also includes an electric field shielding component, which is arranged on the outer surface of the pressure sensor and / or inside the electronic shell and / or on the outer surface of the electronic part; or, it also includes a magnetic field shielding component, which is arranged on the outer surface of the pressure sensor and / or inside the electronic shell and / or on the outer surface of the electronic part.

[0013] Preferably, it also includes a device connector, which is sealed and connected to the air inlet of the base. The device connector is an integrated part or consists of split parts. One end of the device connector passes through the electronic part housing or the mechanical part housing or is arranged on the outside of the circumferential side of the mechanical part housing.

[0014] Preferably, the temperature compensation element is a bimetallic strip or a sealed air chamber sealed with compensation gas; the signal generator is a micro switch or a magnetically assisted electric contact.

[0015] Preferably, it also includes a calibration or air supply port arranged on the mechanical part, and the calibration or air supply port is in gas communication with the base and the equipment connector.

[0016] Through the above technical solution, the remote gas density relay of the present invention can be applied to high-voltage and medium-voltage electrical equipment, and its appearance is very thin, which can meet the miniaturization and intelligence requirements of electrical equipment. At the same time, it can also accurately monitor the gas density of electrical equipment and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of Embodiment 1 of the present invention;

[0018] Figure 2 is another structural schematic diagram of the first embodiment of the present invention;

[0019] Figure 3 It is a structural schematic diagram of Embodiment 2 of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0021] Figure 5This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0023] Figure 7 It is a structural diagram of embodiment 5 of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the present invention, unless otherwise specified, directional words such as "upper, front, rear, side, inner, and outer" generally refer to the upper, front, rear, side, inner, and outer shown in the accompanying drawings.

[0026] Embodiment 1:

[0027] Please refer to Figure 1 As shown, the first embodiment of the present invention provides a remote gas density relay, which includes a mechanical part 1 and an electronic part 2 which is relatively independent of the mechanical part 1. The mechanical part 1 includes: a mechanical part housing 101, a base 102, a Baden tube 103, an end seat 108, a temperature compensation element 104, a movement 105, a pointer 106, a dial 1012, a plurality of signal generators 109 for sending contact signals, and a device connector 1010; the electronic part 2 includes an electronic part housing 2010, and an intelligent processor 202, a power module 203, a pressure sensor 201, a temperature sensor 3 and a communication module 4 arranged in the electronic part housing 2010 of the electronic part 2.

[0028] The process of achieving a thinner appearance and improved performance of the remote gas density relay is as follows: the base 102 includes a Baden tube welding groove 10201, a sensor placement hole 10202, and an air inlet interface 10203, and the three are connected in gas path; one end of the Baden tube 103 is welded to the Baden tube welding groove 10201 of the base 102, and the other end is welded to the end seat 108; the base 102 passes through or is exposed from behind the bottom 10101 of the mechanical part housing 101, and then is welded to the mechanical part housing 101; the pressure sensor 201 is installed in the sensor placement hole 10202 of the base 102, and the pressure sensor 201 is connected to the Baden tube 103 in the gas path.

[0029] The mechanical part housing 101 and the electronic part housing 2010 are independent or separated from each other, and the intelligent processor 202 is respectively connected to the temperature sensor 3, the pressure sensor 201, and the communication module 4. The output signal line 20101 of the pressure sensor 201 is connected to the insulating sealing transition piece lead pin 20901 of the insulating sealing transition piece 209, and then the sensor 201 is installed in the sensor placement hole 10202 of the base 102 through the insulating pieces 204, 205, and 206. The insulating sealing transition piece 209 is sealed with the sensor placement hole 10202 of the base 102 through a sealing ring 2012 or a sealing gasket, or is sealed with the sensor placement hole 10202 of the base 102 by welding on the sensor placement hole 10202 of the base 102, or is sealed with the sensor placement hole 10202 of the base through a sealing ring 2012 or a sealing gasket, and the insulating sealing transition piece 209 is welded on the sensor placement hole 10202 of the base 102 to form a double seal with the sensor placement hole 10202 of the base 102. The insulating sealing transition piece 209 includes an insulating sealing transition piece housing 20902, a plurality of insulating sealing transition piece lead pins 20901, and a sealing element 20903. The sealing between the several insulating sealing transition piece lead pins 20901, the sealing element 20903 and the insulating sealing transition piece housing 20902 can be one of glass sintering process sealing, ceramic sintering process sealing, sealant process sealing, and sealing ring sealing. In addition, the insulating sealing transition piece 209 and the sensor placement hole 10202 of the base can be fixed by welding or / and threaded connection. The temperature sensor 3 can also be set at a position close to the temperature compensation element 104, so that the temperature measured by the temperature sensor 3 is more accurate.

[0030] The device connector 1010 is sealed and connected to the air inlet 10203 of the base 102. The device connector 1010 can be an integrated part or a split part. In this embodiment, one end of the device connector 1010 passes through the electronic part housing 2010, and the other end is connected to the electrical device connector 5. The communication module 4 is arranged at the electronic part housing 2010 or the mechanical part housing 101 or is designed to be integrated with the intelligent processor. The intelligent processor 202 automatically controls the entire monitoring process based on the embedded algorithm and control program of the microprocessor embedded system, including all peripherals, logic and input and output. It has a self-diagnosis module to notify abnormalities including but not limited to disconnection, short circuit alarm, and sensor damage. The temperature compensation element 104 is a bimetallic strip or a sealed air chamber sealed with compensation gas; the plurality of signal generators 109 are micro switches or magnetic auxiliary electrical contacts. The intelligent processor 202, pressure sensor 201, temperature sensor 3, and communication module 4 are designed in an integrated manner; or, the intelligent processor 202 and communication module 4 are designed in an integrated manner; or, the pressure sensor 201, temperature sensor 3, and communication module 4 are designed in an integrated manner. In addition, the base 102 can be designed in an integrated manner or in a split manner. It is very important that the insulating sealing transition piece 209 seals and fixes the sensor 201 in the sensor placement hole 10202, and at the same time acts as a good shielding piece to improve the anti-interference ability of the remote density relay. In addition, a shielding piece 208 is provided inside the base 102, and a shielding piece 2011 is provided on the inner side (or outer side) of the housing 2010, further improving the anti-interference ability of the remote density relay. Since solid insulating pieces 204, 205, and 206 are added around the pressure sensor 201, the several insulating pieces 204, 205, and 206 include but are not limited to one of an insulating pad, an insulating barrel, an insulating sheet, an insulating paper, and a heat shrink tube. At the same time, the shielding members 208 and 2011 are added, and the sealing through the insulating sealing transition member 209 can make the pressure sensor 201 able to withstand very high system overvoltage or lightning overvoltage, so that the pressure sensor will not be damaged, and there will be no leakage problem. In this way, its overvoltage resistance and sealing performance can be greatly improved, and its appearance can be thinned at the same time.

[0031] In the remote gas density relay of the first embodiment of the present invention, its working principle is based on the Baden tube 103 and uses the temperature compensation element 104 to correct the changing pressure and temperature to reflect the change of the (sulfur hexafluoride) gas density. That is, under the pressure of the measured medium (sulfur hexafluoride) gas, due to the effect of the temperature compensation element 104, when the (sulfur hexafluoride) gas density value changes, the (sulfur hexafluoride) gas pressure value also changes accordingly, forcing the end of the Baden tube 103 to produce a corresponding elastic deformation displacement, which is transmitted to the movement 105 with the help of the temperature compensation element 104, and the movement 105 is transmitted to the pointer 106, so that the measured (sulfur hexafluoride) gas density value is indicated on the dial 1012. The signal generator 109 is used as an output alarm locking contact signal. In this way, the gas density relay can display the (sulfur hexafluoride) gas density value. If there is a gas leakage, the (sulfur hexafluoride) gas density value decreases, and the Baden tube 103 produces a corresponding reverse displacement, which is transmitted to the movement 105 through the temperature compensation element 104, and the movement 105 transmits it to the pointer 106. The pointer 106 moves in the direction of the smaller indication value, and the degree of gas leakage is specifically displayed on the dial 1012, and the (alarm lock) contact signal is output through the signal generator 109. The (sulfur hexafluoride) gas density in electrical switches and other equipment is monitored and controlled through mechanical principles, so that the electrical equipment can work safely.

[0032] Please refer to Figure 2 As shown, it is a schematic diagram of the structure of the first embodiment of the present invention, the intelligent processor 202 (can be an existing: general-purpose computer, industrial computer, CPU, single-chip microcomputer, ARM chip, AI chip, quantum chip, photon chip, MCU, FPGA, PLC, etc., industrial control mainboard, embedded main control board, etc.), the power module 203 can be: switching power supply, AC 220V, DC power supply, LDO, programmable power supply, solar energy, storage battery, rechargeable battery, battery, etc. The intelligent processor 202 collects the pressure signal P through the pressure sensor 201 and the temperature signal T through the temperature sensor 3, and uses the mathematical model of the relationship between gas pressure and temperature and adopts the soft measurement method to obtain the corresponding density value P after processing by the intelligent processor 202. 20 (i.e., the pressure value P at 20°C 20 ), and the density value P can be remotely transmitted through the communication module 4 20 , or density value P 20 , pressure value P, temperature value T, or pressure value P, temperature value T, thereby realizing online monitoring of the gas density value P of electrical equipment 20 , or density value P 20, pressure value P, temperature value T, or pressure value P, temperature value T. For example, the remote density relay is connected to the substation comprehensive automation online monitoring system through RS-485 and other data communication methods, and is remotely transmitted to the unmanned station central monitoring station, and real-time monitoring is carried out at the local and remote central monitoring stations of the substation, thereby realizing the online monitoring of SF6 gas density in SF6 electrical equipment. The technical product of the present invention, because the temperature sensor 3 and the temperature compensation element 104 are arranged together; or the temperature sensor 3 is directly arranged on the temperature compensation element 104; or the temperature sensor 3 is arranged in the vicinity of the temperature compensation element 104. After such a new design process, its performance is greatly improved. In short, the intelligent processor 202 collects the pressure signal through the pressure sensor 201 and the temperature signal through the temperature sensor 3, and according to the corresponding gas pressure-temperature characteristics, the corresponding density value P is obtained after processing by the intelligent processor 202. 20 , and transmits remotely through the communication module 4 including but not limited to the density value P 20 , pressure value, or temperature value, thereby realizing online monitoring of these parameter values ​​of electrical equipment.

[0033] In the remote gas density relay of the first embodiment of the present invention, the electronic part housing 2010 is arranged behind the bottom of the mechanical part housing 101, the base 102 is welded to the bottom 10101 of the mechanical part housing 101, the sensor placement hole 10202 of the base 101 and the base air inlet 10203 pass through (or are exposed) from behind the bottom 10101 of the mechanical part housing 101, and exist in the mechanical part housing 101 and the electronic part housing 201 at the same time, which greatly reduces the thickness of the electronic part housing. One end of the device connector 1010 is sealed and connected to the base air inlet 10203; Figure 1 As shown, the integrated structure equipment connector 1010 and the electronic part housing 2010 eccentrically penetrate and then connect with the electrical equipment connector 5 .

[0034] In addition, the base can be an integrated design or a split design.

[0035] Embodiment 2:

[0036] Please refer to Figure 3As shown, the second embodiment of the present invention provides a remote gas density relay, which is mainly composed of a mechanical part 1 and an electronic part 2 which is relatively independent of the mechanical part. The mechanical part 1 includes: a mechanical part housing 101, a base 102, a Baden tube 103, an end seat 108, a temperature compensation element 104, a movement 105, a pointer 106, a dial 1012, a plurality of signal generators 109 for sending contact signals, and a device connector 1010; the electronic part includes an electronic part housing 2010, and an intelligent processor 202, a power module 203, a pressure sensor 201, a temperature sensor 3, and a communication module 4 arranged in the housing of the electronic part 2. The electronic part housing 2010 is arranged behind the bottom of the mechanical part housing 101, the base 102 is welded to the bottom 10101 of the mechanical part housing 101, and the sensor placement hole 10202 and the base air inlet 10203 of the base 101 pass through (or are exposed) from behind the bottom 10101 of the mechanical part housing 101, and exist in the mechanical part housing 101 and the electronic part housing 201 at the same time. Different from the first embodiment, the device connector 1010 of this embodiment adopts a split design, which is composed of a joint 1010A and a connecting joint 1010B welded and / or threaded. Figure 3 As shown, one end is sealed and connected to the base air inlet 10203, and the other end is connected to the electrical equipment connector 5 through the electronic part housing 2010.

[0037] Embodiment three:

[0038] Please refer to Figure 4 As shown, the third embodiment of the present invention provides a remote gas density relay, and the thin remote gas density relay is mainly composed of a mechanical part 1 and an electronic part 2 which is relatively independent of the mechanical part. The mechanical part 1 includes: a mechanical part housing 101, a base 102, a Baden tube 103, an end seat 108, a temperature compensation element 104, a movement 105, a pointer 106, a dial 1012, a plurality of signal generators 109 for sending contact signals, and a device connector 1010; the electronic part includes an electronic part housing 2010, and an intelligent processor 202, a power module 203, a pressure sensor 201, a temperature sensor 3, and a communication module 4 arranged in the housing of the electronic part 2. The electronic part housing 2010 is arranged behind the bottom of the mechanical part housing 101, the base 102 is welded to the bottom 10101 of the mechanical part housing 101, the sensor placement hole 10202 of the base 101 and the base air inlet 10203 are passed through (or exposed) from the back of the bottom 10101 of the mechanical part housing 101, and exist in the mechanical part housing 101 and the electronic part housing 201 at the same time. One end of the device connector 1010 is sealed and connected to the base air inlet 10203; Figure 4As shown, the difference from the first embodiment is that the device connector 1010 of this embodiment passes through the center of the electronic part housing 2010 and then connects to the electrical device connector 5 .

[0039] Embodiment 4:

[0040] Please refer to Figure 5 As shown, the fourth embodiment of the present invention provides a remote gas density relay, which is mainly composed of a mechanical part 1 and an electronic part 2 which is relatively independent of the mechanical part. The mechanical part 1 includes: a mechanical part housing 101, a base 102, a Baden tube 103, an end seat 108, a temperature compensation element 104, a movement 105, a pointer 106, a dial 1012, a plurality of signal generators 109 for sending contact signals, and a device connector 1010; the electronic part includes an electronic part housing 2010, and an intelligent processor 202, a power module 203, a pressure sensor 201, a temperature sensor 3, and a communication module 4 arranged in the housing of the electronic part 2. The electronic part housing 2010 is arranged behind the bottom of the mechanical part housing 101, the base 102 is welded to the bottom 10101 of the mechanical part housing 101, and the sensor placement hole 10202 of the base 101 passes through (or is exposed) from the back of the bottom 10101 of the mechanical part housing 101, and exists in both the mechanical part housing 101 and the electronic part housing 201. Different from the first embodiment, the base air inlet 10203 of this embodiment passes through the circumferential side surface 10102 of the mechanical part housing 101. Figure 5 As shown, one end of the equipment connector 1010 is sealed and connected to the base air inlet 10203 through the circumferential side surface 10102 of the mechanical housing 101, and the other end is connected to the electrical equipment connector 5.

[0041] Embodiment five:

[0042] Please refer to Figure 6As shown, the fifth embodiment of the present invention provides a high-performance thin remote gas density relay, which is mainly composed of a mechanical part 1 and an electronic part 2 that is relatively independent of the mechanical part. The mechanical part 1 includes: a mechanical part housing 101, a base 102, a Baden tube 103, an end seat 108, a temperature compensation element 104, a movement 105, a pointer 106, a dial 1012, a plurality of signal generators 109 for sending contact signals, and a device connector 1010; the electronic part includes an electronic part housing 2010, and an intelligent processor 202, a power module 203, a pressure sensor 201, a temperature sensor 3, and a communication module 4 arranged in the housing of the electronic part 2. The electronic part housing 2010 is arranged behind the bottom of the mechanical part housing 101, the base 102 is welded to the bottom 10101 of the mechanical part housing 101, and the sensor placement hole 10202 and the base air inlet 10203 of the base 101 pass through (or are exposed) from the back of the bottom 10101 of the mechanical part housing 101. Different from the first embodiment, the electronic part housing 2010 of this embodiment directly covers the components passing through (or exposed) from the bottom 10101 of the mechanical housing and all the components in the electronic part 2. Figure 6 One end of the equipment connector 1010 is sealed and connected to the air inlet 10203 of the base, and the other end is connected to the electrical equipment connector 5.

[0043] Since the sensor 201 is installed in the mechanical part housing 101 or passes through (or is exposed from) the electronic part housing 2010 at the same time, the thickness of the electronic part 2 in these five embodiments is greatly reduced.

[0044] Embodiment six:

[0045] Please refer to Figure 7 As shown, the sixth embodiment of the present invention provides a remote gas density relay, which is composed of a mechanical part 1 and an electronic part 2 that is relatively independent of the mechanical part 1. Among them, the mechanical part 1 outputs an alarm or / and a locking contact signal through a cable 10, and the electronic part 2 outputs the monitored gas density and other information through a cable 11. The remote gas density relay of this embodiment also includes a calibration or gas supply port 6, which is connected to the base 102 and the equipment connector 1010 in the gas path through a multi-way connector 7. Specifically, the calibration or gas supply port 6 is arranged on the multi-way connector 7, the multi-way connector 7 is connected to the equipment connector 1010, and the base 102 of the mechanical part 1 is connected to the multi-way connector 7 through a fixing member (nut) 8. A protective cap 9 is also provided on the calibration or gas supply port 6, and the calibration or gas supply port 6 can be used to realize the calibration of the gas density relay and the gas supply of the electrical equipment. The calibration or gas supply port 6 can be arranged above or below the mechanical part 1, or on the left or right side.

[0046] The gas density relay of the present invention may also include: an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch or a gas pressure meter.

[0047] As can be seen from Table 1, the relay of the present invention has a thinner appearance, and has very good accuracy, anti-interference ability and stability, which meets the high-precision requirements and can improve the environmental adaptability of the density relay. At the same time, it has strong anti-interference ability and very good stability, which greatly improves the reliability and accuracy of the smart grid. It better meets the requirements of miniaturization and intelligence of various electrical equipment.

[0048] Table 1 is a comparison table of contact performance between the remote density relay of this patent technology and the remote density relay of the prior art.

[0049] Serial number Test Project This patented technology remote density relay Prior art remote density relay 1 Overall dimensions (thickness, 2 docking points) 90mm 120mm 2 Sealing performance (helium leak detection) <![CDATA[1*10 -9 mbar.l / s]]> <![CDATA[1*10 -7 mbar.l / s]]> 3 Seal life expectancy aging test 20 years 8 years 4 -40∽60℃ range temperature test Maximum error +0.85℃ Maximum error +4.29℃ 5 -40∽60℃ range, density test (at 0.6MPa) Maximum error 0.005MPa Maximum error 0.019MPa 6 -40∽60℃ range, mechanical and electronic density difference test Maximum difference: 0.009MPa Maximum difference: 0.026MPa 7 Electrostatic discharge immunity Contact discharge reaches: 30kV Air discharge reaches: 60kV Contact discharge: 8kV Air discharge: 15kV 8 Surge (impact) immunity Power line: 6kV (line to line) Repetition time: 1 pulse / min Power line: 2kV (line to line) Repetition time: 1 pulse / min 9 Immunity to conducted disturbances induced by radio frequency fields Voltage level: 30V Frequency: 0.15MHz~80MHz Voltage level: 10V Frequency: 0.15MHz~80MHz .

[0050] At the same time, the present invention has one less leakage point than the existing relay, thus improving its sealing performance; and due to the simple structure of the present invention, the manufacturing cost is about 10% lower than that of the existing relay.

[0051] In the present invention, the insulating sealing transition piece and the sensor placement hole of the base can be fixed by welding or / and threaded connection; the several insulating parts can be one of, including but not limited to, insulating pads, insulating barrels, insulating sheets, insulating paper, and heat shrink tubes. The remote gas density relay may also include an electric field shielding member, which is arranged on the outer surface of the pressure sensor and / or the inside of the electronic housing and / or the outer surface of the electronic part; or, it may also include a magnetic field shielding member, which is arranged on the outer surface of the pressure sensor and / or the inside of the electronic housing and / or the outer surface of the electronic part. It also includes a heat insulating member, which is arranged between the mechanical part housing and the electronic part housing; or it is arranged at the power supply of the electronic part. The mechanical part housing of the remote gas density relay is sealed, and gas is sealed in the mechanical part housing, or it is filled with anti-vibration oil. The communication module is arranged at the housing of the electronic part or the housing of the mechanical part or is designed as an integrated whole with the intelligent processor; the intelligent processor automatically controls the entire monitoring process based on the embedded algorithm and control program of the embedded system of the microprocessor, including all peripherals, logic and input and output; the pressure sensor is provided with a shield; or the intelligent processor and / or the communication module is provided with a shield. It has a self-diagnosis module to indicate abnormalities including but not limited to disconnection, short circuit alarm, and sensor damage. The temperature compensation element is a bimetallic strip or a sealed air chamber sealed with compensation gas; the several signal generators are micro switches or magnetically assisted electrical contacts; the intelligent processor, pressure sensor, temperature sensor, and communication module are designed as an integrated whole; or the intelligent processor and communication module are designed as an integrated whole; or the pressure sensor, temperature sensor, and communication module are designed as an integrated whole.

[0052] The pressure sensor may include but is not limited to a relative pressure sensor and / or an absolute pressure sensor; it may be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip-type pressure sensor, a coil induction pressure sensor (such as a pressure sensor with an induction coil attached to a Baden tube), a resistance pressure sensor (such as a pressure sensor with a Baden tube attached to a sliding wire resistor); it may be an analog pressure sensor or a digital pressure sensor; the temperature sensor may be a thermocouple, a thermistor, or a semiconductor type; it may be a contact type or a non-contact type; it may be a thermal resistor or a thermocouple.

[0053] The remote gas density relay of the present invention also includes an insulating sealing transition piece. The pressure temperature sensor or density sensor is arranged in the sensor placement hole of the base through a plurality of insulating parts. The insulating sealing transition piece is sealed and fixed on the sensor placement hole of the base. The signal power line of the pressure temperature sensor or density sensor is connected to the insulating sealing transition piece. The signal power line of the pressure temperature sensor or density sensor is connected to the intelligent processor through the insulating sealing transition piece. The gas density relay also includes a heat insulating part, which is arranged between the mechanical part housing and the electronic part housing; or arranged at the power supply of the electronic part. The mechanical part housing is sealed, and gas is sealed in the mechanical housing, or it is filled with anti-vibration oil. In summary, the remote gas density relay of the present invention has 1. a thinner appearance and stronger adaptability; 2. less air leakage and better sealing performance; 3. lower manufacturing cost.

[0054] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any appropriate manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A remote gas density relay, characterized in that: It includes a mechanical part and an electronic part. The mechanical part includes a mechanical part housing, a base, a Baden tube, an end seat, a temperature compensation element, a signal generator for sending contact signals, a movement, a pointer, and a dial. The electronic part includes an electronic part housing, an intelligent processor, a power module, a pressure sensor, a temperature sensor, and a communication module. The intelligent processor is arranged in the electronic part and is respectively connected with the temperature sensor, the pressure sensor, and the communication module. The intelligent processor collects pressure signals through the pressure sensor, and the temperature sensor collects temperature signals. The corresponding density value is obtained after being processed by the intelligent processor, and the density value, pressure value or temperature value is remotely transmitted through the communication module. The communication module is arranged at the electronic part housing or the mechanical part housing or is integrated with the intelligent processor. The base includes a Baden tube welding groove, a sensor placement hole, an air inlet port, and a pressure sensor. The base is provided at the bottom and / or the circumferential side of the mechanical part shell, and the sensor placement hole of the base passes through or is exposed from the bottom rear of the mechanical part shell, the pressure sensor is provided in the sensor placement hole of the base and is connected with the Baden tube, and the air inlet interface of the base passes through or is exposed from the bottom rear of the mechanical part shell or is provided on the circumferential side of the mechanical part shell; the electronic part shell is provided at the bottom rear of the mechanical part shell, and the sensor placement hole of the base or / and the air inlet interface of the base are covered by the electronic part shell; or, the sensor placement hole of the base or / and the air inlet interface of the base pass through the inside of the electronic part shell; or, the sensor placement hole of the base or / and the air inlet interface of the base pass through or are exposed from the bottom rear of the electronic part shell.

2. The remote gas density relay according to claim 1, characterized in that: The pressure sensor is sealed and fixed on the sensor placement hole of the base through an insulating member, and the shell of the pressure sensor and the base are insulated from each other.

3. The remote gas density relay according to claim 1 or 2, characterized in that: It also includes an insulating sealing transition piece, the pressure sensor is sealed and arranged in the sensor placement hole of the base through the insulating transition piece, the insulating sealing transition piece is sealed and fixed on the sensor placement hole of the base, the signal power line of the pressure sensor is connected to the insulating sealing transition piece, and the signal power line of the pressure sensor is connected to the intelligent processor through the insulating sealing transition piece.

4. The remote gas density relay according to claim 1, characterized in that: The temperature sensor is sealed and arranged in the sensor placement hole of the base, and the pressure sensor and the temperature sensor are integrated pressure temperature sensors or density sensors.

5. The remote gas density relay according to claim 3, characterized in that: The insulating sealing transition piece is sealed with the sensor placement hole of the base through a sealing ring or a sealing gasket; or, the insulating sealing transition piece is sealed with the sensor placement hole of the base by welding on the sensor placement hole of the base; or, the insulating sealing transition piece is sealed with the sensor placement hole of the base through a sealing ring or a sealing gasket, and the insulating sealing transition piece is welded on the sensor placement hole of the base to form a double seal with the sensor placement hole of the base.

6. The remote gas density relay according to claim 3, characterized in that: The insulating and sealing transition piece comprises an insulating and sealing transition piece shell, an insulating and sealing transition piece lead pin and a sealing element which are sealed to each other.

7. The remote gas density relay according to claim 1, characterized in that: It also includes an electric field shielding component, which is arranged on the outer surface of the pressure sensor and / or the inside of the electronic shell and / or the outer surface of the electronic part; or, it also includes a magnetic field shielding component, which is arranged on the outer surface of the pressure sensor and / or the inside of the electronic shell and / or the outer surface of the electronic part.

8. The remote gas density relay according to claim 1, characterized in that: It also includes a device connector, which is sealed and connected to the air inlet of the base. The device connector is an integrated part or consists of split parts. One end of the device connector passes through the electronic part housing or the mechanical part housing or is arranged on the outside of the circumferential side of the mechanical part housing.

9. The remote gas density relay according to claim 1, characterized in that: The temperature compensation element is a bimetallic strip or a sealed air chamber sealed with compensation gas; the signal generator is a micro switch or a magnetic auxiliary electric contact.

10. The remote gas density relay according to claim 8, characterized in that: It also includes a calibration or air supply port arranged on the mechanical part, and the calibration or air supply port is connected with the base and the equipment connecting part gas path.

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