Insulating oil automatic sampling device and automatic control system thereof

Abstract

The invention provides an automatic insulating oil sampling device and an automatic control system thereof, the automatic insulating oil sampling device comprises a box body provided with a cover, and the automatic insulating oil sampling device is characterized in that an oil inlet pipe, a sampling pipe, an oil discharge pipe, a three-way joint, a sampling bottle, a sampling needle tube, a peristaltic pump and a main machine are arranged in the box body, the other end of the sampling tube is connected with a sampling bottle or a sampling needle tube, a first valve is arranged on the oil inlet tube, a second valve and a peristaltic pump are sequentially arranged on the oil discharge tube, and the first valve, the second valve and the peristaltic pump are electrically connected with the host. The operation of the first valve, the second valve and the peristaltic pump is controlled by the host to automatically complete the sampling of the insulating oil and the oil discharge and flushing of the pipeline, so that the problem that the test cannot be carried out or the test error is large due to human factors such as insufficient sampling amount, insufficient flushing amount, insufficient flushing times or mistaken extraction of a needle core of a sample needle tube is avoided.

Description

Technical Field

[0001] The invention provides an automatic device and an automatic control system thereof, in particular to an automatic insulating oil sampling device and an automatic control system thereof, belonging to the technical field of electrical equipment. Background Art

[0002] Insulating oil, also known as transformer oil, is mainly used for insulation, heat dissipation, and arc extinguishing. It is often used in high-voltage electrical equipment. However, after it is mixed with impurities such as moisture, air, and other polar particles, the insulation performance will decrease rapidly. At the same time, as the insulating oil ages, it will corrode the solid insulation and metal parts inside the equipment, causing the overall insulation performance of the equipment to decrease. Therefore, regular sampling of insulating oil and quality monitoring are important tasks in the power industry. The main components of insulating oil are hydrocarbon substances such as alkanes, cycloalkane saturated hydrocarbons, and aromatic unsaturated hydrocarbons. When the equipment fails and the insulating oil is subjected to high-temperature energy of different intensities and durations caused by the failure, the CC bonds and CH bonds of high-molecular hydrocarbons will break, forming low-molecular compounds such as methane, ethane, ethylene, acetylene, hydrogen, and carbon monoxide and carbon dioxide of different concentrations. After analyzing the above low-molecular compounds through insulating oil chromatography, the type and severity of equipment failure can be reversed. This process can also be used as a basis for detecting and judging latent failures of electrical equipment. At present, sampling insulating oil for chromatographic analysis to find faults and latent failures is the mainstream method.

[0003] The life of insulating materials determines the life of the entire electrical equipment. As the main insulating material inside the equipment and the quality of which can be improved by human intervention, quality monitoring and chromatographic analysis of insulating oil are of vital importance. Conventional detection modes include online monitoring and manual sampling detection. Although online monitoring can track and analyze all day, it is restricted by factors such as production costs and detection frequency. Currently, only chromatographic online monitoring devices are commonly used. Insulating oil quality monitoring still requires manual sampling and detection. At the same time, because chromatographic online monitoring is affected by device quality, environmental factors, calibration and maintenance levels, the accuracy of its chromatographic analysis is also lower than that of manual sampling laboratory analysis. Currently, manual sampling detection is still the most reliable mainstream method.

[0004] According to the sampling method of GB / T 7597-2007 Electric Power Oil (Transformer Oil, Turbine Oil): "4.2.1.1 Sampling method requirements: b) The sampling process requires full sealing, that is, the sampling connection method must be reliable, and neither dissolved water and gas in the oil can escape, nor can it be mixed with air (the residual air in the sampling joint must be exhausted), and no bubbles should be generated in the oil during operation"; "4.2.1.2 Sampling operation: c) After connecting the catheter, tee, and syringe in sequence, install them at the oil drain port 5, remove the dead oil in the oil drain valve in the direction of the arrow, and flush the connecting catheter; d) Rotate the tee and use the oil pressure itself to inject oil into the syringe to wet and flush the syringe (the syringe should be flushed 2-3 times)". If the sampling personnel have not received professional training and their professional skills are insufficient, the following situations are likely to occur: ① GB / T The sampling method pointed out in 7597-2007 has too many connection points, which are 3-4, and each connection point is only connected in a mutually nested manner. After completing the connection to the three-way valve at the end of sampling, it needs to be switched 4-5 times. Each connection point is easy to loosen after being subjected to repeated impacts of the oil pressure inside the electrical equipment, resulting in: 1) impurities such as water, air, and dust mixed in the sample; 2) water and gas in the sample escape, resulting in: increased test error; ② when receiving the sample, the operator adjusts the posture and mistakenly draws the needle core of the sampling needle tube, resulting in: negative pressure in the sampling needle tube, resulting in: premature degassing and distortion of the sample; ③ when flushing the sampling needle tube or sampling bottle, the operator flushes insufficiently and the number of flushing times, resulting in: 1) impurities attached to the sampling needle tube or sampling bottle contaminating the sample; 2) the sampling needle tube or sampling bottle is not fully moistened and the air tightness is weakened, and gas escapes during the transportation of the sample, resulting in: sample failure; ④ the operator does not take enough samples, resulting in: the test cannot be carried out. Therefore, it is necessary to improve the existing technology. Summary of the invention

[0005] In order to solve the problems of poor reliability of the existing sampling devices due to too many connection points, nested connections, and easy loosening after multiple oil pressure shocks, as well as the problems of excessive experimental errors caused by insufficient flushing volume, insufficient flushing times, loose sampling needles, etc., the first purpose of the present invention is to provide an automatic sampling device for insulating oil, and the second purpose of the present invention is to provide a system for controlling the sampling device to perform automatic sampling.

[0006] The first object of the present invention is achieved through the following technical solutions: an automatic insulating oil sampling device, comprising a box with a cover on it, characterized in that an oil inlet pipe, a sampling pipe, an oil discharge pipe, a three-way joint, a sampling bottle, a sampling needle tube, a peristaltic pump and a main machine are arranged in the box, wherein the oil inlet pipe is connected to the oil discharge pipe and one end of the sampling pipe respectively through a three-way joint, and the other end of the sampling pipe is connected to the sampling bottle or the sampling needle tube, a first valve is arranged on the oil inlet pipe, and a second valve and a peristaltic pump are arranged on the oil discharge pipe in sequence, and the first valve, the second valve, and the peristaltic pump are electrically connected to the main machine so that the insulating oil sampling and pipeline oil discharge and flushing can be automatically completed by controlling the operation of the first valve, the second valve, and the peristaltic pump through the main machine, so as to avoid the problem that the test cannot be carried out or the test error is large due to human factors such as insufficient sampling amount, flushing amount, flushing times or incorrect extraction of the sampling needle core.

[0007] The oil inlet pipe is divided into a first hard pipe and a first soft pipe, wherein the input end of the first hard pipe is set as an open end connected to the electrical equipment, and the output end is connected to the input end of the first valve, the output end of the first valve is connected to the input end of the first soft pipe, and the output end of the first soft pipe is connected to the first end of the three-way joint, so that the insulating oil in the electrical equipment can be guided to the three-way joint through the oil inlet pipe, and then the insulating oil is sent into the sampling tube through the three-way joint, and finally enters the sampling bottle or the sampling needle tube.

[0008] The sampling tube is configured as a second hard tube and a soft tube, the input ends of the second hard tube and the soft tube are connected to the second connection of the three-way connector, the output ends of the second hard tube and the soft tube are connected to a sampling bottle or a sampling needle tube, a liquid flow meter is provided on the second hard tube connected to the second connection of the three-way connector, and the liquid flow meter is electrically connected to the host, so that the sampling tube can flexibly deliver insulating oil into the sampling bottle or the sampling needle tube as needed, or draw out the insulating oil in the sampling bottle or the sampling needle tube under the suction action of the peristaltic pump.

[0009] The oil drain pipe is divided into a third hard pipe and a third soft pipe, wherein the input end of the third hard pipe is connected to the third connection of the three-way joint, the output end of the third hard pipe is connected to the input end of the second valve, the output end of the second valve is connected to the input end of the third soft pipe, the output end of the third soft pipe is connected to the input end of the peristaltic pump, and the output end of the peristaltic pump is connected to the external discharge pipe, so that the insulating oil in the sampling bottle or the sampling needle tube can be extracted and discharged through the peristaltic pump.

[0010] The sampling bottle includes a bottle body vertically arranged in a box body, a bottle cap is provided at the open top of the bottle body, and a suction tube is vertically provided in the bottle body. The lower end of the suction tube is located at the bottom of the bottle, and the upper end passes through the bottle cap upward and is connected to the output end of the sampling tube, so that the insulating oil can be stored through the sampling bottle. The suction tube facilitates the insulating oil to enter or be extracted from the sampling bottle.

[0011] The sampling needle tube comprises a horizontally arranged barrel, one end of which is provided with a needle-type liquid inlet and outlet and the other end is open. A piston rod is inserted through the open end in the barrel, and the insulating oil can be sucked or pushed out by operating the piston rod.

[0012] The box body is provided with an active buckle matched with the barrel body, and the active buckle includes a base, a pressure plate movably arranged on the base, and a locking buckle or connecting bolts and nuts are arranged between the base and the pressure plate, so that the sampling needle can be conveniently fixed and taken out through the active buckle.

[0013] The box body is provided with liquid level sensors located beside the sampling bottle and the sampling needle respectively. The liquid level sensor is electrically connected to the host so as to transmit the liquid level signal in the sampling bottle or the sampling needle to the host through the liquid level sensor, thereby controlling the amount of insulating oil entering and exiting the sampling bottle or the sampling needle.

[0014] The first valve and the second valve are both configured as electromagnetic valves, so that the opening or closing of the first valve and the second valve can be automatically controlled by the host.

[0015] The second purpose of the present invention is achieved through the following technical solutions: a system for controlling a sampling device for automatic sampling, comprising a main controller, a relay, an electromagnetic valve, a liquid level sensor, a liquid flow meter, a peristaltic pump, a communicator, an indicator light, a display and a power supply arranged in a host computer, the main controller being connected to the communicator, the relay and the display respectively, the communicator being connected to the liquid flow meter, the relay being connected to the liquid level sensor, the electromagnetic valve and the peristaltic pump, and the power supply being connected to the main controller, the relay, the electromagnetic valve and the peristaltic pump, so that the main controller controls the closing and closing of the relay according to the liquid level signal obtained by the liquid level sensor, and further controls the opening and closing of the first valve or the second valve, thereby realizing the automatic injection and extraction of insulating oil.

[0016] The main controller adopts a single chip microcomputer of model STM32F103C8T6.

[0017] The communicator adopts a chip of model MAX485ESA, and pins 4 and 1 of the chip are respectively connected to pins PB10 and PB11 of the single-chip microcomputer, and pins 2 and 3 of the chip are commonly connected to pin PB12 of the single-chip microcomputer, so as to control the reception and transmission of 485 serial communication.

[0018] The relays are divided into RELAY1 relay and RELAY2 relay, wherein the RELAY1 relay is connected to the second valve and the peristaltic pump, and then connected to the PA1 pin of the main controller; the RELAY2 relay is connected to the first valve, and then connected to the PB9 pin of the main controller; so that the opening and closing of the first valve and the second valve can be controlled by the relay, and the peristaltic pump can be started or stopped.

[0019] The indicator light is set as an LED indicator light, and the LED indicator light is connected to the PA5 pin of the main controller through a resistor so that the system working status can be displayed through the indicator light.

[0020] The liquid level flow meter communicates with the microcontroller via the RS485 bus and the modbus protocol, wherein: the RS485 bus is connected to the microcontroller pins PB10 and PB11 via the MAX485ESA+T chip pins 1 and 4, and the MAX485ESA+T chip pins A and B are connected to the liquid level flow meter for communication.

[0021] The liquid level sensor connects the liquid level signal to the PA7 and PB1 pins of the microcontroller through the U19 and U20 connectors through the YW1 and YW2 networks, and the microcontroller reads it through ADC analog-to-digital conversion.

[0022] The present invention has the following advantages and effects: adopting the above scheme, the main engine controls the operation of the first valve, the second valve, and the peristaltic pump to automatically complete the hydraulic oil sampling and pipeline oil drainage and flushing, avoiding the problem that the test cannot be carried out or the test error is large due to human factors such as insufficient sampling volume, flushing volume, and flushing times or the wrong sampling needle core. During operation, the operator's hands are freed and the attention is diverted from holding the syringe, which increases the safety of the operator's high-altitude operations. Since the possible factors of error in the sampling process are eliminated, the test accuracy is increased, and the sample re-taking and project delays caused by doubts about the test data are avoided, the production cost of the enterprise is effectively reduced, the output of the enterprise is increased, and the economic benefits of the enterprise are improved. Avoid misjudgment of test results due to sampling errors, which causes the equipment to run with problems and endangers the safety of the power grid, and unnecessary equipment maintenance caused by misjudgment wastes manpower and material resources, loses load, and causes the loss of state-owned assets and the suspension of electricity for social production and life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A top view of the present invention; Figure 2 A perspective view of the present invention; Figure 3 is a circuit diagram of a main controller of the present invention; Figure 4 A circuit diagram of a communicator of the present invention; Figure 5 , Figure 6 It is the RELAY1 and RELAY2 relay circuit diagram of the present invention; Figure 7 The circuit diagram of the indicator light of the present invention; Figure 8 is a power conversion circuit diagram of the present invention; Fig. 9 This is a circuit diagram of the liquid level sensor of the present invention.

[0025] In the figure, 1, cover, 2, liquid level sensor, 3, box, 4, host, 5, peristaltic pump, 6, third hose, 7, second valve, 8, third hard tube, 9, liquid flow meter, 10, three-way connector, 11, first hose, 12, first valve, 13, first hard tube, 14, movable buckle, 15, sampling needle tube, 16, hose, 17, suction tube, 18, bottle cap, 19, sampling bottle, 20, lock, 21, pressure plate, 22, base. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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. Example 1

[0027] The insulating oil automatic sampling device provided by the present invention comprises a box body 3 with a cover 1 thereon, wherein an oil inlet pipe, a sampling pipe, an oil discharge pipe, a three-way joint 10, a sampling bottle 19, a sampling needle tube 15, a peristaltic pump 5 and a main unit 4 are arranged in the box body 3, wherein the oil inlet pipe is respectively connected to the oil discharge pipe and one end of the sampling pipe through the three-way joint 10, and the other end of the sampling pipe is connected to the sampling bottle 19 or the sampling needle tube 15, a first valve 12 is arranged on the oil inlet pipe, and a second valve 7 and a peristaltic pump 5 are arranged on the oil discharge pipe in sequence, and the first valve 12, the second valve 7, the peristaltic pump 5 are electrically connected to the main unit 4, so that the operation of the first valve 12, the second valve 7 and the peristaltic pump 5 is controlled by the main unit 4 to automatically complete the insulating oil sampling and pipeline oil discharge and flushing, thereby avoiding the problem that the test cannot be carried out or the test error is large due to human factors such as insufficient sampling amount, flushing amount, flushing times or wrong sampling needle core; The oil inlet pipe is divided into a first hard pipe 13 and a first soft pipe 11, wherein the input end of the first hard pipe 13 is set as an open end connected to the electrical equipment, and the output end is connected to the input end of the first valve 12, the output end of the first valve 12 is connected to the input end of the first soft pipe 11, and the output end of the first soft pipe 11 is connected to the first connection of the three-way joint 10, so that the insulating oil in the electrical equipment is guided to the three-way joint 10 through the oil inlet pipe, and then the insulating oil is sent to the sampling tube through the three-way joint 10, and finally enters the sampling bottle 19 or the sampling needle tube 15; The sampling tube is set as a second hard tube and a hose 16, the input end of the second hard tube and the hose 16 is connected to the second connection of the three-way connector 10, and the output end of the second hard tube and the hose 16 is connected to the sampling bottle 19 or the sampling needle tube 15. The second hard tube connected to the second connection of the three-way connector 10 is provided with a liquid flow meter 9, and the liquid flow meter 9 is electrically connected to the host 4, so that the sampling tube can flexibly send the insulating oil into the sampling bottle 19 or the sampling needle tube 15 as needed, or extract the insulating oil in the sampling bottle 19 or the sampling needle tube 15 under the suction action of the peristaltic pump 5; The oil discharge pipe is divided into a third hard pipe 8 and a third soft pipe 6, wherein the input end of the third hard pipe 8 is connected to the third connection of the three-way joint 10, the output end of the third hard pipe 8 is connected to the input end of the second valve 7, the output end of the second valve 7 is connected to the input end of the third soft pipe 6, the output end of the third soft pipe 6 is connected to the input end of the peristaltic pump 5, and the output end of the peristaltic pump is connected to the external discharge pipe, so that the insulating oil in the sampling bottle 19 or the sampling needle tube 15 can be pumped out and discharged through the peristaltic pump 5; The sampling bottle 19 includes a bottle body vertically arranged in the box body 3, a bottle cap 18 is arranged at the open top of the bottle body, and a suction pipe 17 is vertically arranged in the bottle body, the lower end of the suction pipe 17 is located at the bottom of the bottle, and the upper end of the suction pipe 17 passes through the bottle cap 18 upward and is connected to the output end of the sampling pipe, so that the insulating oil is stored through the sampling bottle 19, and the suction pipe 17 facilitates the insulating oil to enter or be extracted from the sampling bottle 19; The sampling needle tube 15 comprises a horizontally arranged barrel, one end of which is provided with a needle-type liquid inlet and outlet, and the other end is set to be open. A piston rod is inserted through the open end in the barrel, and the insulating oil can be sucked or pushed out by operating the piston rod. The box body 3 is provided with an active buckle 14 matched with the barrel body, and the active buckle 14 includes a base 22, a pressing plate 21 movably arranged on the base 22, and a lock buckle 20 or a connecting bolt and nut are arranged between the base 22 and the pressing plate 21, so as to facilitate fixing and taking out the sampling needle tube 15 through the active buckle 14; Two liquid level sensors 2 are provided in the box 3, which are located beside the sampling bottle 19 and the sampling needle tube 15, respectively. The two liquid level sensors 2 are electrically connected to the host 4, so that the liquid level signals in the sampling bottle 19 or the sampling needle tube 15 are transmitted to the host 4 through the two liquid level sensors 2, respectively, so as to control the amount of insulating oil entering and exiting the sampling bottle 19 or the sampling needle tube 15; The first valve 12 and the second valve 7 are both configured as electromagnetic valves, so that the opening or closing of the first and second valves 12 and 17 can be automatically controlled by the host 4; The second object of the present invention is achieved through the following technical solutions: a system for controlling a sampling device to perform automatic sampling, comprising a main controller, a relay, an electromagnetic valve, a liquid level sensor, a liquid flow meter, a peristaltic pump, a communicator, an indicator light, a display and a power supply arranged in a host 4, the main controller is respectively connected to the communicator, the relay and the display, the communicator is connected to the liquid flow meter, the relay is connected to the liquid level sensor, the electromagnetic valve and the peristaltic pump, and the power supply is connected to the main controller, the relay, the electromagnetic valve and the peristaltic pump, so that the main controller controls the closing and disconnection of the relay according to the liquid level signal obtained by the liquid level sensor, and further controls the opening and closing of the first valve 12 or the second valve 7, so as to realize the automatic injection and extraction of insulating oil; The main controller uses a single-chip microcomputer model STM32F103C8T6; The communicator uses a chip of model MAX485ESA, pins 4 and 1 of the chip are connected to pins PB10 and PB11 of the single-chip microcomputer respectively, and pins 2 and 3 of the chip are connected to pin PB12 of the single-chip microcomputer together, so as to control the reception and transmission of 485 serial communication; The relays are divided into RELAY1 relay and RELAY2 relay, wherein RELAY1 relay is connected to the second valve 7 and the peristaltic pump 5, and then connected to the PA1 pin of the main controller, and RELAY2 relay is connected to the first valve 12, and then connected to the PB9 pin of the main controller; so as to control the opening and closing of the first valve 12 and the second valve 7, and control the peristaltic pump 5 to start or stop through the relay; The liquid level flow meter communicates with the microcontroller via the RS485 bus and the modbus protocol, wherein: the RS485 bus is connected to the pins PB10 and PB11 of the microcontroller via the pins 1 and 4 of the MAX485ESA+T chip, and the pins A and B of the MAX485ESA+T chip are connected to the liquid level flow meter for communication; The liquid level sensor connects the liquid level signal to the PA7 and PB1 pins of the microcontroller through the U19 and U20 connectors through the YW1 and YW2 networks, and the microcontroller reads it through ADC analog-to-digital conversion; The indicator light is set as an LED indicator light, and the LED indicator light is connected to the PA5 pin of the main controller through a resistor so that the system working status can be displayed through the indicator light. Example 2

[0028] The insulating oil automatic sampling device provided by the present invention comprises a box body 3 with a cover 1 thereon, wherein an oil inlet pipe, a sampling pipe, an oil discharge pipe, a three-way joint 10, a sampling needle tube 15, a peristaltic pump 5 and a main unit 4 are arranged in the box body 3, wherein the oil inlet pipe is respectively connected to the oil discharge pipe and one end of the sampling pipe through the three-way joint 10, and the other end of the sampling pipe is connected to the sampling needle tube 15, a first valve 12 is arranged on the oil inlet pipe, and a second valve 7 and a peristaltic pump 5 are arranged on the oil discharge pipe in sequence, and the first valve 12, the second valve 7, the peristaltic pump 5 are electrically connected to the main unit 4, so that the operation of the first valve 12, the second valve 7 and the peristaltic pump 5 is controlled by the main unit 4 to automatically complete the insulating oil sampling and pipeline oil discharge and flushing, thereby avoiding the problem that the test cannot be carried out or the test error is large due to human factors such as insufficient sampling amount, flushing amount, flushing times or wrong sampling needle core; The oil inlet pipe is divided into a first hard pipe 13 and a first soft pipe 11, wherein the input end of the first hard pipe 13 is set as an open end connected to the electrical equipment, and the output end is connected to the input end of the first valve 12, the output end of the first valve 12 is connected to the input end of the first soft pipe 11, and the output end of the first soft pipe 11 is connected to the first connection of the three-way joint 10, so that the insulating oil in the electrical equipment is guided to the three-way joint 10 through the oil inlet pipe, and then the insulating oil is sent to the sampling tube through the three-way joint 10, and finally enters the sampling needle tube 15; The sampling tube is set as a second hard tube and a hose 16, the input end of the second hard tube and the hose 16 is connected to the second connection of the three-way joint 10, and the output end of the second hard tube and the hose 16 is connected to the sampling needle tube 15. The second hard tube connected to the second connection of the three-way joint 10 is provided with a liquid flow meter 9, and the liquid flow meter 9 is electrically connected to the host 4, so that the sampling tube can flexibly draw the insulating oil sampling needle tube 15 according to the needs, or draw the insulating oil in the sampling needle tube 15 out under the suction action of the peristaltic pump 5; The oil drain pipe is divided into a third hard pipe 8 and a third soft pipe 6, wherein the input end of the third hard pipe 8 is connected to the third connection of the three-way joint 10, the output end of the third hard pipe 8 is connected to the input end of the second valve 7, the output end of the second valve 7 is connected to the input end of the third soft pipe 6, the output end of the third soft pipe 6 is connected to the input end of the peristaltic pump 5, and the output end of the peristaltic pump is connected to the external discharge pipe, so that the insulating oil in the sampling needle tube 15 can be pumped out and discharged through the peristaltic pump 5; The sampling needle tube 15 comprises a horizontally arranged barrel, one end of which is provided with a needle-type liquid inlet and outlet, and the other end is set to be open. A piston rod is inserted through the open end in the barrel, and the insulating oil can be sucked or pushed out by operating the piston rod. The box body 3 is provided with an active buckle 14 matched with the barrel body, and the active buckle 14 includes a base 22, a pressing plate 21 movably arranged on the base 22, and a lock buckle 20 or a connecting bolt and nut are arranged between the base 22 and the pressing plate 21, so as to facilitate fixing and taking out the sampling needle tube 15 through the active buckle 14; A liquid level sensor 2 is provided in the box 3 and is located beside the sampling needle tube 15. The liquid level sensor 2 is electrically connected to the host 4 so as to transmit a liquid level signal in the sampling needle tube 15 to the host 4 through the liquid level sensor 2, thereby controlling the amount of insulating oil entering and exiting the sampling needle tube 15. The first valve 12 and the second valve 7 are both configured as electromagnetic valves, so that the opening or closing of the first and second valves 12 and 17 can be automatically controlled by the host 4; The second object of the present invention is achieved through the following technical solutions: a system for controlling a sampling device to perform automatic sampling, comprising a main controller, a relay, an electromagnetic valve, a liquid level sensor, a liquid flow meter, a peristaltic pump, a communicator, an indicator light, a display and a power supply arranged in a host 4, the main controller is respectively connected to the communicator, the relay and the display, the communicator is connected to the liquid flow meter, the relay is connected to the liquid level sensor, the electromagnetic valve and the peristaltic pump, and the power supply is connected to the main controller, the relay, the electromagnetic valve and the peristaltic pump, so that the main controller controls the closing and disconnection of the relay according to the liquid level signal obtained by the liquid level sensor, and further controls the opening and closing of the first valve 12 or the second valve 7, so as to realize the automatic injection and extraction of insulating oil; The main controller uses a single-chip microcomputer model STM32F103C8T6; The communicator uses a chip of model MAX485ESA, pins 4 and 1 of the chip are connected to pins PB10 and PB11 of the single-chip microcomputer respectively, and pins 2 and 3 of the chip are connected to pin PB12 of the single-chip microcomputer together, so as to control the reception and transmission of 485 serial communication; The relays are divided into RELAY1 relay and RELAY2 relay, wherein RELAY1 relay is connected to the second valve 7 and the peristaltic pump 5, and then connected to the PA1 pin of the main controller, and RELAY2 relay is connected to the first valve 12, and then connected to the PB9 pin of the main controller; so as to control the opening and closing of the first valve 12 and the second valve 7, and control the peristaltic pump 5 to start or stop through the relay; The liquid level flow meter communicates with the microcontroller via the RS485 bus and the modbus protocol, wherein: the RS485 bus is connected to the pins PB10 and PB11 of the microcontroller via the pins 1 and 4 of the MAX485ESA+T chip, and the pins A and B of the MAX485ESA+T chip are connected to the liquid level flow meter for communication; The liquid level sensor connects the liquid level signal to the PA7 and PB1 pins of the microcontroller through the U19 and U20 connectors through the YW1 and YW2 networks, and the microcontroller reads it through ADC analog-to-digital conversion; The indicator light is set as an LED indicator light, and the LED indicator light is connected to the PA5 pin of the main controller through a resistor so that the system working status can be displayed through the indicator light. Example 3

[0029] The insulating oil automatic sampling device provided by the present invention comprises a box body 3 with a cover 1 thereon, wherein an oil inlet pipe, a sampling pipe, an oil discharge pipe, a three-way joint 10, a sampling bottle 19, a peristaltic pump 5 and a host 4 are arranged in the box body 3, wherein the oil inlet pipe is respectively connected to the oil discharge pipe and one end of the sampling pipe through the three-way joint 10, and the other end of the sampling pipe is connected to the sampling bottle 19 or connected, a first valve 12 is arranged on the oil inlet pipe, and a second valve 7 and a peristaltic pump 5 are arranged on the oil discharge pipe in sequence, and the first valve 12, the second valve 7, the peristaltic pump 5 are electrically connected to the host 4, so that the operation of the first valve 12, the second valve 7, and the peristaltic pump 5 is controlled by the host 4 to automatically complete the insulating oil sampling and pipeline oil discharge and flushing, thereby avoiding the problem that the test cannot be carried out or the test error is large due to human factors such as insufficient sampling amount, flushing amount, flushing times or wrong sampling needle core; The oil inlet pipe is divided into a first hard pipe 13 and a first soft pipe 11, wherein the input end of the first hard pipe 13 is set as an open end connected to the electrical equipment, and the output end is connected to the input end of the first valve 12, the output end of the first valve 12 is connected to the input end of the first soft pipe 11, and the output end of the first soft pipe 11 is connected to the first connection of the three-way joint 10, so that the insulating oil in the electrical equipment is guided to the three-way joint 10 through the oil inlet pipe, and then the insulating oil is sent to the sampling tube through the three-way joint 10, and finally enters the sampling bottle 19; The sampling tube is configured as a second hard tube and a hose 16, the input end of the second hard tube and the hose 16 is connected to the second connection of the three-way connector 10, and the output end of the second hard tube and the hose 16 is connected to the sampling bottle 19. The second hard tube connected to the second connection of the three-way connector 10 is provided with a liquid flow meter 9, and the liquid flow meter 9 is electrically connected to the host 4, so that the sampling tube can flexibly deliver the insulating oil into the sampling bottle 19 or the sampling needle tube 15 as required, or extract the insulating oil in the sampling bottle 19 or the sampling needle tube 15 under the suction action of the peristaltic pump 5; The oil discharge pipe is divided into a third hard pipe 8 and a third soft pipe 6, wherein the input end of the third hard pipe 8 is connected to the third connection of the three-way joint 10, the output end of the third hard pipe 8 is connected to the input end of the second valve 7, the output end of the second valve 7 is connected to the input end of the third soft pipe 6, the output end of the third soft pipe 6 is connected to the input end of the peristaltic pump 5, and the output end of the peristaltic pump is connected to the external discharge pipe, so that the insulating oil in the sampling bottle 19 or the sampling needle tube 15 can be pumped out and discharged through the peristaltic pump 5; The sampling bottle 19 includes a bottle body vertically arranged in the box body 3, a bottle cap 18 is arranged at the open top of the bottle body, and a suction pipe 17 is vertically arranged in the bottle body, the lower end of the suction pipe 17 is located at the bottom of the bottle, and the upper end of the suction pipe 17 passes through the bottle cap 18 upward and is connected to the output end of the sampling pipe, so that the insulating oil is stored through the sampling bottle 19, and the suction pipe 17 facilitates the insulating oil to enter or be extracted from the sampling bottle 19; A liquid level sensor 2 is provided in the box 3 and is located next to the sampling bottle 19. The liquid level sensor 2 is electrically connected to the host 4 so as to transmit a liquid level signal in the sampling bottle 19 to the host 4 through the liquid level sensor 2, thereby controlling the amount of insulating oil entering and exiting the sampling bottle 19. The first valve 12 and the second valve 7 are both configured as electromagnetic valves, so that the opening or closing of the first and second valves 12 and 17 can be automatically controlled by the host 4; The second object of the present invention is achieved through the following technical solutions: a system for controlling a sampling device to perform automatic sampling, comprising a main controller, a relay, an electromagnetic valve, a liquid level sensor, a liquid flow meter, a peristaltic pump, a communicator, an indicator light, a display and a power supply arranged in a host 4, the main controller is respectively connected to the communicator, the relay and the display, the communicator is connected to the liquid flow meter, the relay is connected to the liquid level sensor, the electromagnetic valve and the peristaltic pump, and the power supply is connected to the main controller, the relay, the electromagnetic valve and the peristaltic pump, so that the main controller controls the closing and disconnection of the relay according to the liquid level signal obtained by the liquid level sensor, and further controls the opening and closing of the first valve 12 or the second valve 7, so as to realize the automatic injection and extraction of insulating oil; The main controller uses a single-chip microcomputer model STM32F103C8T6; The communicator uses a chip of model MAX485ESA, pins 4 and 1 of the chip are connected to pins PB10 and PB11 of the single-chip microcomputer respectively, and pins 2 and 3 of the chip are connected to pin PB12 of the single-chip microcomputer together, so as to control the reception and transmission of 485 serial communication; The relays are divided into RELAY1 relay and RELAY2 relay, wherein RELAY1 relay is connected to the second valve 7 and the peristaltic pump 5, and then connected to the PA1 pin of the main controller, and RELAY2 relay is connected to the first valve 12, and then connected to the PB9 pin of the main controller; so as to control the opening and closing of the first valve 12 and the second valve 7, and control the peristaltic pump 5 to start or stop through the relay; The liquid level flow meter communicates with the microcontroller via the RS485 bus and the modbus protocol, wherein: the RS485 bus is connected to the pins PB10 and PB11 of the microcontroller via the pins 1 and 4 of the MAX485ESA+T chip, and the pins A and B of the MAX485ESA+T chip are connected to the liquid level flow meter for communication; The liquid level sensor connects the liquid level signal to the PA7 and PB1 pins of the microcontroller through the U19 and U20 connectors through the YW1 and YW2 networks, and the microcontroller reads it through ADC analog-to-digital conversion; The indicator light is set as an LED indicator light, and the LED indicator light is connected to the PA5 pin of the main controller through a resistor so that the system working status can be displayed through the indicator light.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic sampling device for insulating oil, comprising a box with a cover, characterized in that An oil inlet pipe, a sampling pipe, an oil discharge pipe, a three-way joint, a sampling bottle, a sampling needle, a peristaltic pump and a main engine are arranged in the box, wherein the oil inlet pipe is connected to the oil discharge pipe and one end of the sampling pipe respectively through a three-way joint, and the other end of the sampling pipe is connected to the sampling bottle or the sampling needle, a first valve is arranged on the oil inlet pipe, and a second valve and a peristaltic pump are arranged on the oil discharge pipe in sequence, and the first valve, the second valve and the peristaltic pump are electrically connected to the main engine.

2. The automatic insulating oil sampling device according to claim 1, characterized in that The oil inlet pipe is divided into a first hard pipe and a first soft pipe, wherein the input end of the first hard pipe is set as an open end connected to the electrical equipment, and the output end is connected to the input end of the first valve, the output end of the first valve is connected to the input end of the first soft pipe, and the output end of the first soft pipe is connected to the first end of the three-way joint; The sampling tube is configured as a second hard tube and a soft tube, the input end of the second hard tube and the soft tube is connected to the second connection of the three-way connector, the output end of the second hard tube and the soft tube is connected to the sampling bottle or the sampling needle tube, and the second hard tube connected to the second connection of the three-way connector is provided with a liquid flow meter, and the liquid flow meter is electrically connected to the host; The oil drain pipe is divided into a third hard pipe and a third soft pipe, wherein the input end of the third hard pipe is connected to the third connection of the three-way joint, the output end of the third hard pipe is connected to the input end of the second valve, the output end of the second valve is connected to the input end of the third soft pipe, the output end of the third soft pipe is connected to the input end of the peristaltic pump, and the output end of the peristaltic pump is connected to the external drain pipe.

3. The automatic insulating oil sampling device according to claim 1 is characterized in that The sampling bottle comprises a bottle body vertically arranged in the box, a bottle cap is arranged at the open top of the bottle body, and a suction tube is vertically arranged in the bottle body, the lower end of the suction tube is located at the bottom of the bottle, and the upper end of the suction tube passes through the bottle cap upward and is connected to the output end of the sampling tube; The sampling needle tube comprises a horizontally arranged barrel, one end of which is provided with a needle-type liquid inlet and outlet and the other end is open. A piston rod is inserted through the open end in the barrel, and the insulating oil can be sucked or pushed out by operating the piston rod.

4. The automatic insulating oil sampling device according to claim 1, characterized in that The box body is provided with an active buckle matched with the cylinder body, and the active buckle includes a base, a pressure plate movably arranged on the base, and a lock buckle or a connecting bolt and a nut are arranged between the base and the pressure plate.

5. The automatic insulating oil sampling device according to claim 1, characterized in that The box body is provided with liquid level sensors located beside the sampling bottle and the sampling needle respectively. The liquid level sensor is electrically connected to the host so as to transmit the liquid level signal in the sampling bottle or the sampling needle to the host through the liquid level sensor, thereby controlling the amount of insulating oil entering and exiting the sampling bottle or the sampling needle.

6. The automatic insulating oil sampling device according to claim 1, characterized in that The first valve and the second valve are both configured as electromagnetic valves.

7. A system for controlling a sampling device for automatic sampling, comprising a main controller, a relay, an electromagnetic valve, a liquid level sensor, a liquid flow meter, a peristaltic pump, a communicator, an indicator light, a display and a power supply arranged in a host computer, wherein the main controller is connected to the communicator, the relay and the display respectively, the communicator is connected to the liquid flow meter, the relay is connected to the liquid level sensor, the electromagnetic valve and the peristaltic pump, and the power supply is connected to the main controller, the relay, the electromagnetic valve and the peristaltic pump.

8. The system for controlling a sampling device to perform automatic sampling according to claim 7, characterized in that The main controller adopts a single chip microcomputer of model STM32F103C8T6; The communicator uses a chip of model MAX485ESA, pins 4 and 1 of the chip are connected to pins PB10 and PB11 of the microcontroller respectively, and pins 2 and 3 of the chip are connected to pin PB12 of the microcontroller together; The relays are divided into RELAY1 relay and RELAY2 relay, wherein RELAY1 relay is connected to the second valve and the peristaltic pump, and then connected to the PA1 pin of the main controller; RELAY2 relay is connected to the first valve, and then connected to the PB9 pin of the main controller.

9. The system for controlling a sampling device to perform automatic sampling according to claim 7, characterized in that The liquid level flow meter communicates with the microcontroller via the RS485 bus and the modbus protocol, wherein: the RS485 bus is connected to the microcontroller pins PB10 and PB11 via the MAX485ESA+T chip pins 1 and 4, and the MAX485ESA+T chip pins A and B are connected to the liquid level flow meter for communication.

10. The system for controlling a sampling device to perform automatic sampling according to claim 7, characterized in that The liquid level sensor connects the liquid level signal to the PA7 and PB1 pins of the microcontroller through the U19 and U20 connectors through the YW1 and YW2 networks, and the microcontroller reads it through ADC analog-to-digital conversion.

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