Sampling device and sampling system for general oil-filled electrical equipment

Abstract

The invention discloses a sampling device and a sampling system for general oil-filled power equipment. The device comprises a pipeline control module and a self-sealing quick connection module, the self-sealing quick connection module comprises a one-way valve; a pipeline is defined in the main body part, the two opposite ends of the main body part are used for being in sealed connection with one end of the one-way valve and a sampling opening of the universal oil-filled electrical equipment respectively, and the sampling opening is connected with the one-way valve through the pipeline; the pipeline control module comprises N electromagnetic valves, wherein one end of each electromagnetic valve is connected to the corresponding container in a sealed mode; one end of the sample injection port is connected with the other end, away from the main body part, of the one-way valve, and the other end of the sample injection port is connected with the other end of each electromagnetic valve. Therefore, the safety in the sampling process is improved, and the quality of the collected sample is improved.

Description

Technical Field

[0001] The present application relates to the field of sampling technology, and in particular to a sampling device and a sampling system for general oil-filled electrical equipment. Background Art

[0002] Insulating oil has good cooling and arc extinguishing properties, which can protect the internal components of power equipment and delay the aging of equipment. Therefore, it is widely used in high-voltage power equipment. However, the insulating oil inside the electrical equipment will continue to deteriorate during long-term operation. When it deteriorates to a certain extent, it will seriously endanger the safety of equipment operation. At the same time, when local overheating, discharge and other faults occur inside the equipment, the insulating oil will quickly decompose and produce corresponding characteristic gases. Therefore, it is necessary to take oil samples from the oil-filled power equipment for chromatographic testing. When the transformer and its on-load switch fail, the gas relay will operate, and the generated gas will be collected in the corresponding gas collecting box. At this time, it is necessary to take gas samples from the gas collecting box for chromatographic testing. The chromatographic test results can effectively reflect the actual operating status of the power equipment. Therefore, the accuracy of the chromatographic test results is the key basis for fault diagnosis of oil-filled power equipment, and the accuracy of the chromatographic test results depends on whether the collected samples can accurately reflect the current status of the insulating oil inside the equipment.

[0003] At present, there are many numbers and types of oil-filled power equipment such as oil-immersed mutual inductors, transformers, and reactors. During the sampling process, the oil and gas samples of traditional sampling devices are easily exposed to the outside air during transfer. At the same time, malicious conditions such as oil spraying may occur during the oil extraction process, which can easily cause environmental pollution and pose certain risks to the power grid and personal safety. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the embodiment of the present application proposes a sampling device and a sampling system for general oil-filled electrical equipment, which can improve the sealing during the sampling process to avoid contact between the sample and the outside during transfer as much as possible, thereby improving the safety of the sampling process and improving the quality of the collected samples.

[0005] In a first aspect, an embodiment of the present application provides a sampling device for general oil-filled electrical equipment, including a pipeline control module and a self-sealing quick connection module;

[0006] Wherein, the self-sealing quick connection module comprises:

[0007] One-way valves; and

[0008] A main body, wherein a pipeline is defined inside the main body, and two opposite ends of the main body are respectively used for sealingly connecting one end of the one-way valve and a sampling port of the universal oil-filled power equipment, and the sampling port is connected to the one-way valve via the pipeline;

[0009] Wherein, the pipeline control module comprises:

[0010] N solenoid valves, one end of each of the solenoid valves is sealed and connected to the corresponding container, and N is an integer greater than or equal to 2; and

[0011] An injection port, one end of which is connected to the other end of the one-way valve away from the main body, and the other end of the injection port is connected to the other end of each of the solenoid valves;

[0012] Wherein, the main body is used to collect samples from the sampling port. When any of the solenoid valves is turned on, the collected sample flows through a channel sequentially composed of the pipeline, the one-way valve, the sampling port, the turned-on solenoid valve and its corresponding container.

[0013] Optionally, the N solenoid valves include a first solenoid valve and a second solenoid valve, and the sampling device further includes an intelligent control module;

[0014] The intelligent control module includes:

[0015] A flow rate regulating module and a metering module connected in series, wherein the other end of the injection port and the other end of each of the solenoid valves are connected via the flow rate regulating module and the metering module connected in series; and

[0016] A controller is communicatively connected with the flow rate regulating module, the metering module, and the N solenoid valves, and the controller is configured as follows:

[0017] In response to a sampling instruction, a set waste sample discharge amount and a sampling target amount are obtained, and at a first time point, only the first solenoid valve among the N solenoid valves is controlled to be turned on, so that the collected sample flows into a first container corresponding to the first solenoid valve, until the first sample amount reaches the waste sample discharge amount, and the first solenoid valve is controlled to be closed, wherein the first sample amount is a value obtained by measuring the collected sample from the first time point by the metering module;

[0018] At a second time point, controlling only the second solenoid valve among the N solenoid valves to be turned on, so that the collected sample flows into a second container corresponding to the second solenoid valve, until the second sample amount reaches the sampling target amount, and then controlling the second solenoid valve to be closed, wherein the second sample amount is a value obtained by measuring the collected sample by the metering module starting from the second time point, and the second time point is later than the time point when the first sample amount reaches the waste sample discharge amount;

[0019] The flow rate regulating module is configured to detect the flow rate of the collected sample and regulate the flow rate of the collected sample according to the control of the controller.

[0020] Optionally, the intelligent control module further includes an electric push rod controlled by the controller, and the electric push rod is used to discharge the sample in the second container;

[0021] The controller is also configured to:

[0022] At a third time point after the first sample amount reaches the waste sample discharge amount and earlier than the second time point, only the second solenoid valve among the N solenoid valves is controlled to be turned on, and then the electric push rod is controlled to discharge the sample flowing into the second container, and at a fourth time point after the sample flowing into the second container is completely discharged, the second solenoid valve is controlled to be closed and the first solenoid valve is turned on, so that the discharged sample flows into the first container, wherein the fourth time point is earlier than the second time point.

[0023] Optionally, the intelligent control module further includes a temperature and humidity module and a human-computer interaction module that are communicatively connected to the controller, wherein the temperature and humidity module is used to detect and / or adjust the internal temperature and humidity of the sampling device, and the waste sample discharge amount and the sampling target amount are both input by the user through the human-computer interaction module;

[0024] The controller is also configured to:

[0025] The information of the temperature and humidity module, the information of the N solenoid valves, the information of the metering module and / or the information of the flow rate regulation module are sent to the human-computer interaction module, so that the human-computer interaction module displays the information of the temperature and humidity module, the information of the N solenoid valves, the information of the metering module and / or the information of the flow rate regulation module.

[0026] Optionally, the main body includes:

[0027] A conversion push rod, wherein two opposite ends of the conversion push rod are respectively used for sealingly connecting one end of the one-way valve and the outer wall of the sampling port, and the pipeline is defined inside the conversion push rod; and

[0028] A conversion joint, wherein the conversion joint is sleeved on the outside of the conversion top rod, and one end of the conversion joint is used for sealing connection with the outer wall of the sampling port.

[0029] Optionally, an outer wall of one end of the conversion push rod close to the one-way valve is exposed.

[0030] Optionally, when one end of the conversion joint is sealedly connected to the outer wall of the sampling port, and one end of the conversion top rod close to the sampling port is sealedly connected to the outer wall of the sampling port, the space formed between the inner wall of the conversion joint, the outer wall of the conversion top rod and the outer wall of the sampling port is sealed.

[0031] Optionally, when one end of the conversion joint is sealedly connected to the outer wall of the sampling port and the end of the conversion top rod close to the sampling port is sealedly connected to the outer wall of the sampling port, the inner wall of one end of the conversion joint is configured as an internal thread for matching with the first external thread at the outer wall of the sampling port.

[0032] Optionally, the inner wall of one end of the conversion push rod close to the sampling port is configured as an internal thread for matching with a second external thread at the outer wall of the sampling port, wherein the second external thread is the area of ​​the outer wall of the sampling port excluding the first external thread.

[0033] In a second aspect, an embodiment of the present application provides a sampling system for general oil-filled electrical equipment, comprising any of the sampling devices described above.

[0034] In summary, the embodiments of the present application have at least the following beneficial effects:

[0035] By adopting the embodiments of the present application, the sealing performance during the sampling process can be improved to avoid contact between the sample and the outside during transfer as much as possible, thereby improving the safety of the sampling process and improving the quality of the collected samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a self-sealing quick connection module provided in an embodiment of the present application;

[0037] Figure 2 It is a structural schematic diagram of a pipeline control module provided in an embodiment of the present application;

[0038] Figure 3 It is a schematic diagram of a sampling device for general oil-filled electrical equipment provided in an embodiment of the present application.

[0039] in:

[0040] 110, one-way valve; 121, pipeline; 122, conversion push rod; 123, conversion joint; 130, sealing ring; 200, universal oil-filled electrical equipment; 210, first external thread; 220, second external thread. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In the description of the present application, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more. In the description of the present application, the term "including" and its variations are open inclusions, i.e., "including but not limited to". The term "based on" means "at least partially based on". The term "according to" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments".

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0045] First, see Figure 1 , showing a schematic diagram of the structure of a self-sealing quick connection module provided in an embodiment of the present application, see Figure 2 , showing a schematic diagram of the structure of a pipeline control module provided in an embodiment of the present application, the embodiment of the present application provides a sampling device for a universal oil-filled electric power device 200, including a pipeline control module and a self-sealing quick connection module;

[0046] Wherein, the self-sealing quick connection module comprises:

[0047] a one-way valve 110; and

[0048] A main body, wherein a pipeline 121 is defined inside the main body, and two opposite ends of the main body are respectively used for sealingly connecting one end of the one-way valve 110 and a sampling port of the universal oil-filled power device 200, and the sampling port is connected to the one-way valve 110 via the pipeline 121;

[0049] It should be noted that, in this embodiment, one end of the main body close to the sampling port can be sealed and connected to the sampling port of universal oil-filled electrical equipment 200 of different models.

[0050] It is understandable that the sealed connection described in any one or more embodiments of the present application can be achieved through the corresponding sealing rings 130, which will not be described in detail later.

[0051] Wherein, the pipeline control module comprises:

[0052] N solenoid valves, one end of each of the solenoid valves is sealed and connected to the corresponding container, and N is an integer greater than or equal to 2; and

[0053] An injection port, one end of which is connected to the other end of the one-way valve 110 away from the main body, and the other end of the injection port is connected to the other end of each of the solenoid valves;

[0054] Wherein, the main body is used to collect samples from the sampling port. When any of the solenoid valves is turned on, the collected sample flows through a channel sequentially composed of the pipeline 121, the one-way valve 110, the sampling port, the turned-on solenoid valve and its corresponding container.

[0055] In an optional embodiment, the N solenoid valves include a first solenoid valve (i.e. Figure 2 Solenoid valve 1) and the second solenoid valve (i.e. Figure 2 The solenoid valve 2), the sampling device also includes an intelligent control module;

[0056] The intelligent control module includes:

[0057] A flow rate regulating module and a metering module connected in series, wherein the other end of the injection port and the other end of each of the solenoid valves are connected via the flow rate regulating module and the metering module connected in series; and

[0058] A controller (exemplarily, the controller may be composed of an intelligent chip) is communicatively connected with the flow rate regulating module, the metering module, and the N solenoid valves, and the controller is configured as follows:

[0059] In response to the sampling instruction, the set waste sample discharge volume and the sampling target volume are obtained, and at a first time point, only the first solenoid valve among the N solenoid valves is controlled to be turned on, so that the collected sample flows into the first container (i.e., the first container) corresponding to the first solenoid valve. Figure 2 In the middle container 1), until the first sample amount reaches the waste sample discharge amount, the first solenoid valve is controlled to close, wherein the first sample amount is a value obtained by measuring the collected sample from the first time point by the metering module;

[0060] At the second time point, only the second solenoid valve among the N solenoid valves is controlled to be turned on, so that the collected sample flows into the second container (i.e. Figure 2 In the middle container 2), until the second sample amount reaches the sampling target amount, the second solenoid valve is controlled to close, wherein the second sample amount is a value obtained by measuring the collected sample by the metering module starting from the second time point, and the second time point is later than the time point when the first sample amount reaches the waste sample discharge amount;

[0061] The flow rate regulating module is configured to detect the flow rate of the collected sample and regulate the flow rate of the collected sample according to the control of the controller.

[0062] In one example, the structure of the pipeline control module is designed according to the standard sampling work process, the sample flow rate control is realized by the flow rate adjustment module, the sample quantitative control is realized by the metering module, and the working mode switching is realized by two solenoid valves. The inlet is connected to the one-way valve 110 of the self-sealing quick connection device through a hose, and receives the oil sample or gas sample from the oil filling device. If the working mode is the waste oil or waste gas discharge mode, the solenoid valve 1 is opened, the solenoid valve 2 is closed, and the oil sample or gas sample enters the container 1 through the metering module and the solenoid valve 1 in turn. The container 1 is used to collect waste oil or waste gas to prevent the staff from directly discharging and causing environmental pollution; if the working mode is the sampling mode, the solenoid valve 2 is opened, the solenoid valve 1 is closed, and the oil sample or gas sample enters the container 2 through the solenoid valve 2. The container 2 is used to seal and store the oil sample or gas sample, and can be directly used for the test without the need for subsequent transfer operations.

[0063] In one example, see Figure 3 The pipeline control module and the intelligent control module can be integrated in the integrated device box, which can realize the whole process of sealed intelligent discharge of waste oil (gas) and sampling.

[0064] In an optional embodiment, the intelligent control module further includes an electric push rod controlled by the controller, and the electric push rod is used to discharge the sample in the second container;

[0065] The controller is also configured to:

[0066] At a third time point after the first sample amount reaches the waste sample discharge amount and earlier than the second time point, only the second solenoid valve among the N solenoid valves is controlled to be turned on, and then the electric push rod is controlled to discharge the sample flowing into the second container, and at a fourth time point after the sample flowing into the second container is completely discharged, the second solenoid valve is controlled to be closed and the first solenoid valve is turned on, so that the discharged sample flows into the first container, wherein the fourth time point is earlier than the second time point.

[0067] In one example, if the working mode is the flushing mode, the solenoid valve 2 is opened and the solenoid valve 1 is closed, the oil sample or the gas sample enters the container 2 and fills the pipeline 121 to flush the pipeline 121. After the flushing is completed, the solenoid valve 1 is opened, and the electric push rod of the container 2 completely pushes the oil sample or the gas sample in the container 2, and the oil sample or the gas sample enters the container 1.

[0068] In an optional embodiment, the intelligent control module further includes a temperature and humidity module and a human-computer interaction module that are communicatively connected to the controller, wherein the temperature and humidity module is used to detect and / or adjust the internal temperature and humidity of the sampling device, and the waste sample discharge amount and the sampling target amount are both input by the user through the human-computer interaction module;

[0069] The controller is also configured to:

[0070] The information of the temperature and humidity module, the information of the N solenoid valves, the information of the metering module and / or the information of the flow rate regulation module are sent to the human-computer interaction module, so that the human-computer interaction module displays the information of the temperature and humidity module, the information of the N solenoid valves, the information of the metering module and / or the information of the flow rate regulation module.

[0071] In one example, the user can also set the intelligent control strategy in the controller through the human-computer interaction module. The intelligent control strategy is based on the sampling work standards and the supporting hardware design of the device. Its internal control logic can realize the standard operating procedures of the sampling work and is the basis for the controller to implement control. The intelligent control strategy contains a variety of control logics, which can implement different sampling methods according to different tests to meet the requirements of various tests such as chromatography and micro-water for samples. For example, by adjusting the flow rate, bubbles in oil samples can be avoided to meet the chromatography test standards; internal intelligent drying can be used to prevent external moisture from affecting the sample quality to meet the oil pressure resistance and oil micro-water test standards.

[0072] In one example, the temperature and humidity module can be a module used to monitor and adjust the temperature and humidity inside the device. When the temperature and humidity inside the device do not meet the standard operating environment requirements, the temperature and humidity module will perform heating and dehumidification processes on the internal environment to ensure that the internal environment of the device does not have too much impact on the oil and gas samples, thereby affecting the validity of the test data.

[0073] In an optional embodiment, the main body includes:

[0074] a conversion push rod 122, wherein opposite ends of the conversion push rod 122 are respectively used to seal and connect one end of the one-way valve 110 and the outer wall of the sampling port, and the pipeline 121 is defined inside the conversion push rod 122; and

[0075] The conversion joint 123 is sleeved on the outside of the conversion top rod 122, and one end of the conversion joint 123 is used for sealing connection with the outer wall of the sampling port.

[0076] It is understandable that, in this embodiment, based on the influence of different sealing ring 130 layouts on the sealing of the connection device, the internal structure of the self-sealing quick connection device is designed, including the structural design of the conversion joint 123, the conversion push rod 122 and the one-way valve 110, and the multiple sealing rings 130 are designed to ensure the sealing of the device, so that the device can be quickly sealed and connected with the corresponding sampling port, which is convenient to use and has higher sealing. At the same time, the connection device has an adjustable telescopic function (for example, the conversion push rod 122 can be telescopically moved inside the conversion joint 123), so it can adapt to the sealing connection of different types of sampling ports.

[0077] In one example, the self-sealing quick connect module is used as follows:

[0078] 1) Insert the conversion push rod 122 into the hexagonal oil drain thread provided on the sampling port of the universal oil-filled power equipment 200;

[0079] 2) After inserting the conversion joint 123 into the conversion push rod 122, use a 35 open-end wrench to tighten the conversion joint 123 onto the thread of the sampling port of the universal oil-filled power equipment 200;

[0080] 3) Use a hexagonal wrench to rotate the conversion push rod 122, thereby driving the sampling port to rotate, so that the sampling port and the pipeline 121 are connected;

[0081] 4) Use a special self-locking oil sampling joint to insert into the one-way valve 110, so that the collected sample automatically flows out of the one-way valve 110 to the sampling port;

[0082] 5) Pull the dedicated oil sampling self-locking mechanism in the dedicated self-locking oil sampling connector backwards to separate the dedicated self-locking oil sampling connector from the one-way valve 110, so that the one-way valve 110 is closed;

[0083] 6) After the sampling is completed, the conversion push rod 122 is rotated with a hexagonal wrench to drive the sampling port to rotate so that the sampling port is closed.

[0084] In an optional implementation, the outer wall of one end of the conversion push rod 122 close to the one-way valve 110 is exposed.

[0085] In this embodiment, the user can use the exposed outer wall of the conversion push rod 122 to rotate the conversion push rod 122 .

[0086] In an optional embodiment, when one end of the conversion joint 123 is sealedly connected to the outer wall of the sampling port, and the end of the conversion top rod 122 close to the sampling port is sealedly connected to the outer wall of the sampling port, the space formed between the inner wall of the conversion joint 123, the outer wall of the conversion top rod 122 and the outer wall of the sampling port is sealed.

[0087] In an optional embodiment, when one end of the conversion joint 123 is sealedly connected to the outer wall of the sampling port, and the end of the conversion top rod 122 close to the sampling port is sealedly connected to the outer wall of the sampling port, the inner wall of one end of the conversion joint 123 is configured as an internal thread to match the first external thread 210 at the outer wall of the sampling port.

[0088] In an optional embodiment, the inner wall of the conversion push rod 122 at one end near the sampling port is configured as an internal thread for matching with a second external thread 220 at the outer wall of the sampling port, wherein the second external thread 220 is the area of ​​the outer wall of the sampling port excluding the first external thread 210.

[0089] In a second aspect, an embodiment of the present application provides a sampling system for general oil-filled electrical equipment, comprising any of the sampling devices described above.

[0090] In summary, the embodiments of the present application have at least the following beneficial effects:

[0091] By adopting the embodiments of the present application, the sealing performance during the sampling process can be improved to avoid contact between the sample and the outside during transfer as much as possible, thereby improving the safety of the sampling process and improving the quality of the collected samples.

[0092] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus the necessary hardware platform, and of course, it can also be implemented entirely by hardware. Based on such an understanding, all or part of the contribution of the technical solution of the present application to the background technology can be embodied in the form of a software product, and the computer software product can be stored in a storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application or some parts of the embodiments.

[0093] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A sampling device for general oil-filled electrical equipment, characterized in that: Including pipeline control module and self-sealing quick connection module; Wherein, the self-sealing quick connection module comprises: One-way valves; and A main body, wherein a pipeline is defined inside the main body, and two opposite ends of the main body are respectively used for sealingly connecting one end of the one-way valve and a sampling port of the universal oil-filled power equipment, and the sampling port is connected to the one-way valve via the pipeline; Wherein, the pipeline control module comprises: N solenoid valves, one end of each of the solenoid valves is sealed and connected to the corresponding container, and N is an integer greater than or equal to 2; and An injection port, one end of which is connected to the other end of the one-way valve away from the main body, and the other end of the injection port is connected to the other end of each of the solenoid valves; Wherein, the main body is used to collect samples from the sampling port. When any of the solenoid valves is turned on, the collected sample flows through a channel sequentially composed of the pipeline, the one-way valve, the sampling port, the turned-on solenoid valve and its corresponding container.

2. The sampling device according to claim 1, characterized in that The N solenoid valves include a first solenoid valve and a second solenoid valve, and the sampling device also includes an intelligent control module; The intelligent control module includes: A flow rate regulating module and a metering module connected in series, wherein the other end of the injection port and the other end of each of the solenoid valves are connected via the flow rate regulating module and the metering module connected in series; and A controller is communicatively connected with the flow rate regulating module, the metering module, and the N solenoid valves, and the controller is configured as follows: In response to a sampling instruction, a set waste sample discharge amount and a sampling target amount are obtained, and at a first time point, only the first solenoid valve among the N solenoid valves is controlled to be turned on, so that the collected sample flows into a first container corresponding to the first solenoid valve, until the first sample amount reaches the waste sample discharge amount, and the first solenoid valve is controlled to be closed, wherein the first sample amount is a value obtained by measuring the collected sample from the first time point by the metering module; At a second time point, controlling only the second solenoid valve among the N solenoid valves to be turned on, so that the collected sample flows into a second container corresponding to the second solenoid valve, until the second sample amount reaches the sampling target amount, and then controlling the second solenoid valve to be closed, wherein the second sample amount is a value obtained by measuring the collected sample by the metering module starting from the second time point, and the second time point is later than the time point when the first sample amount reaches the waste sample discharge amount; The flow rate regulating module is configured to detect the flow rate of the collected sample and regulate the flow rate of the collected sample according to the control of the controller.

3. The sampling device according to claim 2, characterized in that: The intelligent control module further includes an electric push rod controlled by the controller, and the electric push rod is used to discharge the sample in the second container; The controller is also configured to: At a third time point after the first sample amount reaches the waste sample discharge amount and earlier than the second time point, only the second solenoid valve among the N solenoid valves is controlled to be turned on, and then the electric push rod is controlled to discharge the sample flowing into the second container, and at a fourth time point after the sample flowing into the second container is completely discharged, the second solenoid valve is controlled to be closed and the first solenoid valve is turned on, so that the discharged sample flows into the first container, wherein the fourth time point is earlier than the second time point.

4. The sampling device according to claim 2, characterized in that: The intelligent control module also includes a temperature and humidity module and a human-computer interaction module that are communicatively connected to the controller, wherein the temperature and humidity module is used to detect and / or adjust the internal temperature and humidity of the sampling device, and the waste sample discharge amount and the sampling target amount are both input by the user through the human-computer interaction module; The controller is also configured to: The information of the temperature and humidity module, the information of the N solenoid valves, the information of the metering module and / or the information of the flow rate regulation module are sent to the human-computer interaction module, so that the human-computer interaction module displays the information of the temperature and humidity module, the information of the N solenoid valves, the information of the metering module and / or the information of the flow rate regulation module.

5. The sampling device according to any one of claims 1 to 4, characterized in that: The main body comprises: A conversion push rod, wherein two opposite ends of the conversion push rod are respectively used for sealingly connecting one end of the one-way valve and the outer wall of the sampling port, and the pipeline is defined inside the conversion push rod; and A conversion joint, wherein the conversion joint is sleeved on the outside of the conversion top rod, and one end of the conversion joint is used for sealing connection with the outer wall of the sampling port.

6. The sampling device according to claim 5, characterized in that The outer wall of one end of the conversion push rod close to the one-way valve is exposed.

7. The sampling device according to claim 5, characterized in that: When one end of the conversion joint is sealedly connected to the outer wall of the sampling port, and the end of the conversion push rod close to the sampling port is sealedly connected to the outer wall of the sampling port, the space formed between the inner wall of the conversion joint, the outer wall of the conversion push rod and the outer wall of the sampling port is sealed.

8. The sampling device according to claim 5, characterized in that: When one end of the conversion joint is sealedly connected to the outer wall of the sampling port, and the end of the conversion push rod close to the sampling port is sealedly connected to the outer wall of the sampling port, the inner wall of one end of the conversion joint is configured as an internal thread to match the first external thread at the outer wall of the sampling port.

9. The sampling device according to claim 8, characterized in that The inner wall of one end of the conversion push rod close to the sampling port is configured as an internal thread for matching with a second external thread at the outer wall of the sampling port, wherein the second external thread is the area of ​​the outer wall of the sampling port excluding the first external thread.

10. A sampling system for general oil-filled electrical equipment, characterized in that: A sampling device comprising any one of claims 1 to 9.

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