Sample liquid extraction and detection device for online monitoring of dissolved gas in transformer oil

Abstract

A sample liquid extracting and detecting device for on-line monitoring of dissolved gas in transformer oil comprises a tank cylinder (1) used for storing the transformer oil, a three-way valve set arranged on the tank cylinder (1) and an oil pump (8) arranged in the three-way valve set, built-in storage of the transformer oil is achieved through the tank cylinder (1), and built-in storage of the transformer oil is achieved through the three-way valve set. A pipeline located on a transformer oil liquid tank is connected with a pipeline located on a sample injection port for online monitoring of transformer oil liquid dissolved gas, and circulating stirring power is generated on transformer oil liquid in the tank cylinder (1) through the oil pump (8). The transformer oil liquid as a raw material of the detection sample liquid is in a flowing impact mixing state, and the technical problem that the detection sample liquid is stood and stored by adopting an oil bag and a piston type oil cylinder is solved, so that the online monitoring precision of the dissolved gas in the transformer oil liquid is improved.

Description

Technical Field

[0001] The utility model relates to a device for extracting and detecting sample liquid, in particular to a device for extracting and detecting sample liquid used for online monitoring of dissolved gas in transformer oil. Background Art

[0002] In order to ensure the safe operation of the transformer, it is necessary to conduct online monitoring of the dissolved gas in the transformer oil. Therefore, the extraction and detection sample liquid device used for online monitoring of the dissolved gas in the transformer oil is an important transformer component. In the existing extraction and detection sample liquid device used for online monitoring of the dissolved gas in the transformer oil, oil bags and piston cylinders are mostly used to statically store the detection sample liquid. However, with the changes in ambient temperature and air pressure, and the continuous consumption of the detection sample liquid, the detection sample liquid is prone to uneven mixing and changes in the dissolved gas content, thereby affecting the accuracy of online monitoring of the dissolved gas in the transformer oil.

[0003] The utility model makes the transformer oil as the raw material of the test sample liquid in a flowing impact mixing state by the technical feature, and effectively explores and studies the technical problem of using oil bags and piston cylinders to statically store the test sample liquid.

[0004] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0005] The object of the utility model is a sample liquid extraction and detection device for online monitoring of dissolved gas in transformer oil.

[0006] In order to overcome the above technical shortcomings, the purpose of the utility model is to provide a device for extracting and detecting sample liquid for online monitoring of dissolved gas in transformer oil, thereby improving the accuracy of online monitoring of dissolved gas in transformer oil.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: comprising a tank for storing transformer oil, a three-way valve group arranged on the tank, and an oil pump arranged in the three-way valve group.

[0008] Due to the design of the box cylinder, three-way valve group and oil pump, the box cylinder is used to realize built-in storage of transformer oil, the three-way valve group is used to connect the pipeline on the transformer oil tank and the pipeline on the sample injection port for online monitoring of dissolved gas in transformer oil, and the oil pump is used to generate circulating stirring power for the transformer oil in the box cylinder, so that the transformer oil as the raw material of the test sample liquid is put into a flowing impact mixing state, which solves the technical problem of using oil bags and piston cylinders to statically store the test sample liquid, thereby improving the accuracy of online monitoring of dissolved gas in transformer oil.

[0009] The utility model is designed to connect the tank, the three-way valve group and the oil pump to each other in a manner that the transformer oil liquid as the raw material of the detection sample liquid is in a flow impact mixing state.

[0010] The utility model is designed to connect the oil pump with the tank and the three-way valve group in a manner of generating circulating stirring power for transformer oil.

[0011] The utility model is designed that the three-way valve group is arranged to include a three-way valve I and a three-way valve II.

[0012] The technical effects of the above four technical solutions are: highlighting the technical feature of putting the transformer oil liquid, which is the raw material of the test sample liquid, in a flow impact mixing state, and introducing the application in the technical field of the extraction and detection sample liquid device for online monitoring of dissolved gas in transformer oil liquid.

[0013] The utility model is designed to further include a first accessory device, and the first accessory device is arranged between the three-way valve group and the box cylinder. The first accessory device is arranged to include a piston rod, a ball valve and an air pump.

[0014] The utility model is designed to further include a second accessory device, and the second accessory device is arranged on the first accessory device, and the second accessory device is arranged as a pressure gauge.

[0015] The technical effects of the above two technical solutions are: realizing the integrated installation of other technical features and expanding the technical effects of the present utility model.

[0016] The utility model is designed to provide a piston rod in a box cylinder, respectively provide a ball valve and a three-way valve II on the box cylinder, and provide a three-way valve I on the piston rod, respectively provide an air pump and a pressure gauge on the ball valve, and provide an oil pump between the three-way valve I and the three-way valve II.

[0017] The technical effect of the above technical solution is that the basic technical solution of the utility model is formed by the box cylinder, piston rod, three-way valve I, ball valve, three-way valve II, air pump, pressure gauge and oil pump, which solves the technical problems of the utility model.

[0018] The utility model is designed in that the box cylinder is configured as a circular box-shaped body with a accommodating hole in the middle part of the upper end face, and the accommodating hole is configured to be connected to the piston rod, the box cylinder is configured to be connected to the piston rod in an accommodating manner, and the inner wall of the box cylinder is configured to be connected to the piston rod in a contacting manner, the upper part of the peripheral side surface of the box cylinder is configured to be connected to the ball valve in a communicating manner, and the lower part of the peripheral side surface of the box cylinder is configured to be connected to the three-way valve II in a communicating manner.

[0019] The utility model is designed that the accommodating hole body is arranged as a circular hole body with a sealing ring on the inner wall.

[0020] The technical effect of the above two technical solutions is that the transformer oil can be stored in the inner cavity.

[0021] The utility model is designed that the oil pump is set as a circulation pump and one of the ports of the oil pump is set to be connected to the three-way valve I through a pipeline, and the other port of the oil pump is set to be connected to the three-way valve II through a pipeline.

[0022] The technical effect of the above technical solution is that it realizes the powered transmission of transformer oil.

[0023] The utility model is designed in that the first end of the three-way valve I is configured to be connected to the piston rod and the first port portion of the three-way valve I is configured to be connected in a communication manner with the box cylinder and the piston rod respectively, the second end of the three-way valve I is configured to be connected in a communication manner with the oil pump through a pipeline and the third end of the three-way valve I is configured to be connected in a communication manner with the transformer oil tank through a pipeline.

[0024] The technical effect of the above technical solution is that it realizes connection with the pipeline located on the transformer oil tank.

[0025] The utility model is designed in that the first port portion of the three-way valve II is arranged to be connected to the box cylinder, the second end portion of the three-way valve II is arranged to be connected to the oil pump through a pipeline, and the third end portion of the three-way valve II is arranged to be connected to the sample injection port for online monitoring of dissolved gas in transformer oil through a pipeline.

[0026] The technical effect of the above technical solution is that it realizes connection with the pipeline on the sample injection port located at the online monitoring of dissolved gas in transformer oil.

[0027] The utility model is designed in that the piston rod is configured to include a disc portion and a tube portion, and the lower end of the tube portion is configured to be through-connected with the center portion of the disc portion, the upper end of the tube portion is configured to be through-connected with the box cylinder, and the peripheral side portion of the disc portion is configured to be contact-connected with the box cylinder, and the upper end port portion of the tube portion is configured to be connected with the three-way valve I.

[0028] The utility model is designed such that the disc portion is arranged as a circular block and the tube portion is arranged as a circular cylindrical body.

[0029] The technical effects of the above two technical solutions are: separating the box cylinder into upper and lower isolation chambers, and storing the transformer oil in the lower isolation chamber.

[0030] The utility model is designed in that the ball valve is set as a manual ball valve and one of the port parts of the ball valve is set to be connected to the box cylinder in a communicating manner, another port part of the ball valve is set to be connected to the air pump through the first pipe and the second pipe respectively, and another port part of the ball valve is set to be connected to the pressure gauge through the third pipe.

[0031] The utility model is designed that the air pump is arranged as a pump-shaped body with an air extraction port and an air charging port, and the air extraction port and the air charging port of the air pump are respectively arranged to be connected in a communication manner with the ball valve.

[0032] The technical effect of the above two technical solutions is that the internal pressure of the box cylinder can be regulated.

[0033] The utility model is designed that the pressure gauge is arranged as a pointer pressure gauge and the contact port portion of the pressure gauge is arranged to be connected in a communication manner with the ball valve.

[0034] The technical effect of the above two technical solutions is that the internal pressure of the tank can be measured.

[0035] The utility model is designed such that the box cylinder and the piston rod, the three-way valve I, the ball valve, the three-way valve II, the air pump, the pressure gauge and the oil pump are distributed in the form of an external pump body.

[0036] The utility model is designed such that the center line of the box cylinder, the center line of the piston rod and the center line of the three-way valve I are arranged on the same straight line, and the pipe part is arranged to be connected with the accommodating hole body.

[0037] In this technical solution, the box cylinder and oil pump are basic components and are also necessary technical features of the utility model. The piston rod, three-way valve I, ball valve, three-way valve II, air pump and pressure gauge are functional components and are features for achieving other technical effects of the utility model. The design of the technical features such as the accommodating hole body, disc part and tube part is a technical feature that complies with the Patent Law and its implementing rules.

[0038] In the present technical solution, the transformer oil serving as the raw material of the test sample liquid is put into a flow impact mixing state by a three-way valve group and an oil pump.

[0039] In this technical solution, the important technical features are the box cylinder, three-way valve group and oil pump that put the transformer oil liquid, which is the raw material of the test sample liquid, in a flow impact mixing state. In the technical field of the extraction and detection sample liquid device for online monitoring of dissolved gas in transformer oil liquid, it has novelty, creativity and practicality. The terms in this technical solution can be explained and understood using the patent literature in this technical field. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 This is a schematic diagram of the utility model.

[0042] Cylinder-1, piston rod-2, three-way valve I-3, ball valve-4, three-way valve II-5, air pump-6, pressure gauge-7, oil pump-8, receiving hole body-11, disc-21, pipe-22. DETAILED DESCRIPTION

[0043] According to the Examination Guidelines, terms such as “having”, “including” and “comprising” used in the present invention should be understood as not precluding the existence or addition of one or more other elements or their combinations.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0046] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. In addition, unless otherwise specified, the equipment and materials used in the following examples are commercially available. If the processing conditions are not clearly stated, please refer to the purchased product manual or follow the conventional methods in the field.

[0047] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0048] Figure 1 This is the first embodiment of the utility model, which is described in detail with reference to the accompanying drawings. It includes a cylinder 1, a piston rod 2, a three-way valve I3, a ball valve 4, a three-way valve II5, an air pump 6, a pressure gauge 7 and an oil pump 8. The piston rod 2 is arranged in the cylinder 1, the ball valve 4 and the three-way valve II5 are respectively arranged on the cylinder 1, and the three-way valve I3 is arranged on the piston rod 2, the air pump 6 and the pressure gauge 7 are respectively arranged on the ball valve 4, and the oil pump 8 is arranged between the three-way valve I3 and the three-way valve II5.

[0049] In this embodiment, the box cylinder 1 is configured as a circular box-shaped body having a accommodating hole body 11 in the middle part of the upper end face and the accommodating hole body 11 is configured to be connected to the piston rod 2, the box cylinder 1 is configured to be accommodatingly connected to the piston rod 2 and the inner wall of the box cylinder 1 is configured to be contact-connected to the piston rod 2, the upper part of the peripheral side surface of the box cylinder 1 is configured to be in communication with the ball valve 4 and the lower part of the peripheral side surface of the box cylinder 1 is configured to be in communication with the three-way valve Ⅱ5.

[0050] Through the box cylinder 1, a support connection point for the piston rod 2, the ball valve 4 and the three-way valve Ⅱ5 is formed. The box cylinder 1 and the accommodating hole 11 realize the connection with the piston rod 2. The box cylinder 1 realizes the connection with the ball valve 4 and the connection with the three-way valve Ⅱ5. Its technical purpose is to be used as a component for storing transformer oil.

[0051] In this embodiment, the receiving hole 11 is configured as a circular hole with a sealing ring on the inner wall.

[0052] Its technical purpose is to support the piston rod 2.

[0053] In this embodiment, the piston rod 2 is configured to include a disc portion 21 and a tube portion 22, and the lower end of the tube portion 22 is configured to be through-connected with the center portion of the disc portion 21, the upper end of the tube portion 22 is configured to be through-connected with the cylinder 1, and the peripheral side portion of the disc portion 21 is configured to be contact-connected with the cylinder 1, and the upper end port portion of the tube portion 22 is configured to be connected with the three-way valve Ⅰ3.

[0054] A supporting connection point for the cylinder 1 and the three-way valve Ⅰ3 is formed by the piston rod 2. The connection with the cylinder 1 is realized by the disc portion 21 and the pipe portion 22. The connection with the three-way valve Ⅰ3 is realized by the pipe portion 22. Its technical purpose is to serve as a component for forming upper and lower isolation cavities in the cylinder 1.

[0055] In the present embodiment, the disk portion 21 is provided as a circular block-shaped body and the tube portion 22 is provided as a circular cylindrical body.

[0056] Its technical purpose is to achieve up and down reciprocating motion in the box cylinder 1.

[0057] In this embodiment, the ball valve 4 is set as a manual ball valve and one of the port portions of the ball valve 4 is set to be connected in a communicative manner with the cylinder 1, another port portion of the ball valve 4 is set to be connected in a communicative manner with the air pump 6 through a first pipe and a second pipe respectively, and another port portion of the ball valve 4 is set to be connected in a communicative manner with the pressure gauge 7 through a third pipe.

[0058] Through the ball valve 4, a supporting connection point is formed for the cylinder 1, the air pump 6 and the pressure gauge 7. The ball valve 4 realizes the connection with the cylinder 1, the air pump 6 and the pressure gauge 7. Its technical purpose is to serve as a component for controlling the opening and closing between the air pump 6 and the pressure gauge 7 and the cylinder 1.

[0059] In this embodiment, the air pump 6 is configured as a pump-shaped body having an air extraction port and an air charging port, and the air extraction port and the air charging port of the air pump 6 are respectively configured to be communicatively connected to the ball valve 4 .

[0060] A supporting connection point for the ball valve 4 is formed by the air pump 6, and the air pump 6 realizes the connection with the ball valve 4. Its technical purpose is to be used as a component for evacuating and inflating the cylinder 1.

[0061] In this embodiment, the pressure gauge 7 is configured as a pointer pressure gauge and a contact port portion of the pressure gauge 7 is configured to be communicatively connected to the ball valve 4 .

[0062] A supporting connection point for the ball valve 4 is formed by the pressure gauge 7 , and the pressure gauge 7 realizes connection with the ball valve 4 . Its technical purpose is to serve as a component for measuring and identifying the air pressure in the cylinder 1 .

[0063] In this embodiment, the first end of the three-way valve I3 is configured to be connected to the piston rod 2 and the first port portion of the three-way valve I3 is configured to be connected to the cylinder 1 and the piston rod 2 respectively, the second end of the three-way valve I3 is configured to be connected to the oil pump 8 through a pipeline and the third end of the three-way valve I3 is configured to be connected to the transformer oil tank through a pipeline.

[0064] Through the three-way valve I3, a supporting connection point is formed for the cylinder 1, the piston rod 2 and the oil pump 8. The three-way valve I3 realizes the connection with the cylinder 1, the piston rod 2 and the oil pump 8. Its technical purpose is to serve as a component for controlling the opening and closing between the piston rod 2 and the oil pump 8.

[0065] In this embodiment, the first port portion of the three-way valve II5 is configured to be connected to the tank cylinder 1, the second end portion of the three-way valve II5 is configured to be connected to the oil pump 8 through a pipeline, and the third end portion of the three-way valve II5 is configured to be connected to the sample injection port for online monitoring of dissolved gas in transformer oil through a pipeline.

[0066] Through the three-way valve Ⅱ5, a supporting connection point is formed for the cylinder 1 and the oil pump 8. The three-way valve Ⅱ5 realizes the connection with the cylinder 1 and the oil pump 8. Its technical purpose is to serve as a component for controlling the opening and closing between the cylinder 1 and the oil pump 8.

[0067] In this embodiment, the oil pump 8 is configured as a circulation pump and one of its ports is configured to be communicatively connected to the three-way valve I3 through a pipeline, and another of its ports is configured to be communicatively connected to the three-way valve II5 through a pipeline.

[0068] Through the oil pump 8, a support connection point for the three-way valve I3 and the three-way valve II5 is formed. The oil pump 8 realizes the connection with the three-way valve I3 and the connection with the three-way valve II5. Its technical purpose is to serve as a power component for circulating and stirring the transformer oil in the tank 1.

[0069] In this embodiment, the cylinder 1 and the piston rod 2 and the three-way valve I3, the ball valve 4, the three-way valve II5, the air pump 6, the pressure gauge 7 and the oil pump 8 are arranged to be distributed in the form of an external pump body, and the center line of the cylinder 1, the center line of the piston rod 2 and the center line of the three-way valve I3 are arranged on the same straight line, and the pipe portion 22 is arranged to be connected to the accommodating hole body 11.

[0070] The method of using this embodiment: When using this device, separate the third end of the three-way valve I3 from the pipe on the transformer oil tank, connect the other end of the ball valve 4 to the second pipe on the inflation port of the air pump 6, open the ball valve 4, and work the air in the upper isolation chamber of the cylinder 1. Read the pressure value of the upper isolation chamber of the cylinder 1 through the pressure gauge 7, and make the pressure value of the upper isolation chamber of the cylinder 1 positive. The disc 21 moves downward in the cylinder 1, and the air in the lower isolation chamber of the cylinder 1 is released into the atmosphere through the pipe 22 and the third end of the three-way valve I3. The air in the lower isolation chamber of the cylinder 1 is exhausted. When the lower isolation chamber of the cylinder 1 is completed, After the air is exhausted, the third end of the three-way valve I3 is connected to the pipe on the transformer oil tank, so that the air pump 6 is in a non-working state, the ball valve 4 is in a closed state, the other port of the ball valve 4 is disconnected from the second pipe on the inflation port of the air pump 6, the other port of the ball valve 4 is connected to the first pipe on the exhaust port of the air pump 6, the ball valve 4 is in an open state, the air pump 6 is in a working state, the upper isolation chamber of the cylinder 1 is vacuumed, and the pressure value of the upper isolation chamber of the cylinder 1 is negative. The disc 21 moves upward in the cylinder 1, and the transformer oil is injected into the lower isolation chamber of the cylinder 1 through the third end of the three-way valve I3 and the pipe 22. , after the transformer oil is injected into the lower isolation chamber of the box cylinder 1, the third end of the three-way valve I3 and the pipeline on the transformer oil tank are closed, and the other port of the ball valve 4 and the first pipeline on the air pump 6 exhaust port are disconnected, and the other port of the ball valve 4 and the second pipeline on the air pump 6 inflation port are connected, and the ball valve 4 is opened, and the air pump 6 is in working state, keeping the pressure value of the upper isolation chamber of the box cylinder 1 at a positive value, and the first port of the three-way valve I3 is connected with the box cylinder 1 and the piston rod 2, and the first port of the three-way valve II5 is connected with the box cylinder 1, and the second end of the three-way valve I3 and the three-way valve The second end of the three-way valve Ⅱ5 is in a connected state with the pipeline on the oil pump 8, so that the third end of the three-way valve Ⅱ5 and the pipeline on the sample injection port of the online monitoring of the dissolved gas in the transformer oil are in a closed state, so that the oil pump 8 is in a working state, and the transformer oil in the lower isolation chamber of the box cylinder 1 is circulated and stirred in the lower isolation chamber of the box cylinder 1 through the pipe part 22, the three-way valve Ⅰ3, the oil pump 8 and the three-way valve Ⅱ5, and the test sample liquid is obtained in the lower isolation chamber of the box cylinder 1. When the test sample liquid needs to be extracted, the third end of the three-way valve Ⅱ5 is in a connected state with the pipeline on the sample injection port of the online monitoring of the dissolved gas in the transformer oil, and the test sample liquid is added to the sample injection port of the online monitoring of the dissolved gas in the transformer oil.After the extraction of the test sample liquid is completed, the third end of the three-way valve II 5 and the pipeline located on the sample injection port of the transformer oil dissolved gas online monitoring are closed. When the device is not in use, the air pump 6 and the oil pump 8 are in a non-operating state.

[0071] When verifying the present utility model, the inventor abandoned the existing technical feature of using oil bags and piston-type oil cylinders to statically store the test sample liquid, and first proposed a technical feature of putting the transformer oil liquid, which is the raw material of the test sample liquid, into a flow impact mixing state, and obtained the first unexpected technical effect: it is achieved that the transformer oil liquid, which is the raw material of the test sample liquid, is consistently in a flow mixing state, thereby ensuring the performance consistency of the test sample liquid; it is achieved that the second unexpected technical effect: it is achieved that the transformer oil liquid is sampled under a negative pressure state, thereby eliminating the interference of external air; it is achieved that the third unexpected technical effect: it is achieved that the test sample liquid is sampled under a positive pressure state, thereby ensuring sufficient sampling; it is achieved that the fourth unexpected technical effect: it is achieved that the residual air is eliminated from the box cylinder 1, thereby ensuring the purity of the test sample liquid; it is achieved that the fifth unexpected technical effect: it is achieved that the transformer oil liquid flows and impacts and mixes under a positive pressure state, thereby improving the mixing and stirring effect of the transformer oil liquid.

[0072] In the second embodiment of the present invention, the tank 1, the three-way valve group and the oil pump 8 are connected to each other in such a manner that the transformer oil serving as the raw material of the test sample liquid is in a flow impact mixing state.

[0073] In this embodiment, the oil pump 8 is connected to the tank 1 and the three-way valve group in a manner that generates circulating stirring power for the transformer oil.

[0074] In this embodiment, the three-way valve group is configured to include a three-way valve I3 and a three-way valve II5.

[0075] In this embodiment, a first accessory device is also included and is arranged between the three-way valve group and the cylinder 1 . The first accessory device is configured to include a piston rod 2 , a ball valve 4 and an air pump 6 .

[0076] In this embodiment, a second accessory device is further included and is arranged on the first accessory device. The second accessory device is configured as a pressure gauge 7 .

[0077] The second embodiment of the present invention is based on the first embodiment.

[0078] The utility model has the following features:

[0079] 1. Due to the design of the box cylinder 1, the three-way valve group and the oil pump 8, the box cylinder 1 is used to realize built-in storage of the transformer oil. The three-way valve group is used to connect the pipeline on the transformer oil tank and the pipeline on the sample injection port for online monitoring of the dissolved gas in the transformer oil. The oil pump 8 is used to generate a circulating stirring power for the transformer oil in the box cylinder 1, so that the transformer oil as the raw material of the test sample liquid is in a flowing impact mixing state, which solves the technical problem of using oil bags and piston-type oil cylinders to statically store the test sample liquid, thereby improving the accuracy of online monitoring of the dissolved gas in the transformer oil.

[0080] 2. Due to the design of three-way valve I3 and three-way valve II5, dual external port connection is achieved.

[0081] 3. Due to the design of the piston rod 2, the ball valve 4 and the air pump 6, the air extraction and air injection processes in the cylinder 1 are realized.

[0082] 4. Due to the design of the pressure gauge 7, the pressure value in the tank 1 can be monitored online.

[0083] 5. Since the design limits the numerical range of the structural shape, the numerical range is the technical feature in the technical solution of the utility model, and is not a technical feature calculated by formula or obtained through a limited number of tests. Tests have shown that the technical feature of this numerical range has achieved good technical effects.

[0084] 6. Due to the design of the technical features of the present invention, the effects of the individual and combined technical features have been shown through experiments to show that the performance indicators of the present invention are at least 1.7 times that of the existing performance indicators, and the evaluation shows that the present invention has a good market value.

[0085] There are other technical features connected to the box cylinder 1, the three-way valve group and the oil pump 8 for putting the transformer oil liquid serving as the raw material of the test sample liquid in a flow impact mixing state, which are all one of the embodiments of the present utility model, and the various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to meet the requirements of the Patent Law, the Patent Implementation Rules and the Examination Guidelines, all possible combinations of the various technical features in the above-mentioned embodiments will no longer be described.

[0086] Therefore, in the technical field of extraction and detection sample liquid devices for online monitoring of dissolved gas in transformer oil, all technical contents including a tank cylinder 1 for storing transformer oil, a three-way valve group arranged on the tank cylinder 1, and an oil pump 8 arranged in the three-way valve group are within the protection scope of this utility model.

Claims

1. A liquid sample extraction and detection device for online monitoring of dissolved gas in transformer oil, characterized by: The invention comprises a tank (1) for storing transformer oil, a three-way valve group arranged on the tank (1), and an oil pump (8) arranged in the three-way valve group. The tank (1), the three-way valve group and the oil pump (8) are connected to each other in such a manner that the transformer oil liquid serving as the raw material of the test sample liquid is in a flow impact mixing state. The oil pump (8) is connected to the tank (1) and the three-way valve group in a manner that generates circulating stirring power for the transformer oil. The three-way valve group is configured to include a three-way valve I (3) and a three-way valve II (5). Or, it further comprises a first accessory device and the first accessory device is arranged between the three-way valve group and the box cylinder (1), and the first accessory device is arranged to include a piston rod (2), a ball valve (4) and an air pump (6), Alternatively, a second accessory device is further included and the second accessory device is arranged on the first accessory device, and the second accessory device is arranged as a pressure gauge (7).

2. The sampling device for extracting and detecting dissolved gas in transformer oil according to claim 1 is characterized in that: A piston rod (2) is provided in a tank cylinder (1), a ball valve (4) and a three-way valve II (5) are provided on the tank cylinder (1), a three-way valve I (3) is provided on the piston rod (2), an air pump (6) and a pressure gauge (7) are provided on the ball valve (4), and an oil pump (8) is provided between the three-way valve I (3) and the three-way valve II (5).

3. The sampling device for extracting and detecting dissolved gas in transformer oil according to claim 2, characterized in that: The box cylinder (1) is configured as a circular box-shaped body having a receiving hole (11) in the middle of the upper end surface, and the receiving hole (11) is configured to be connected to the piston rod (2). The box cylinder (1) is configured to be connected to the piston rod (2) in a receiving manner, and the inner wall of the box cylinder (1) is configured to be connected to the piston rod (2) in a contact manner. The upper portion of the peripheral side surface of the box cylinder (1) is configured to be connected to the ball valve (4), and the lower portion of the peripheral side surface of the box cylinder (1) is configured to be connected to the three-way valve II (5). Alternatively, the accommodating hole body (11) is configured as a circular hole body with a sealing ring on the inner wall.

4. The sampling device for extracting and detecting dissolved gas in transformer oil according to claim 2, characterized in that: The oil pump (8) is configured as a circulation pump and one of its ports is configured to be connected to the three-way valve I (3) via a pipeline, while the other port of the oil pump (8) is configured to be connected to the three-way valve II (5) via a pipeline.

5. The sampling device for extracting and detecting dissolved gas in transformer oil for online monitoring according to claim 2, characterized in that: The first end of the three-way valve I (3) is configured to be connected to the piston rod (2) and the first port portion of the three-way valve I (3) is configured to be connected in a communication manner to the box cylinder (1) and the piston rod (2), respectively; the second end of the three-way valve I (3) is configured to be connected in a communication manner to the oil pump (8) through a pipeline and the third end of the three-way valve I (3) is configured to be connected in a communication manner to the transformer oil tank through a pipeline, Alternatively, a first port portion of the three-way valve II (5) is configured to be connected in a communication manner with the tank (1), a second end portion of the three-way valve II (5) is configured to be connected in a communication manner with the oil pump (8) through a pipeline, and a third end portion of the three-way valve II (5) is configured to be connected in a communication manner with a sample injection port for online monitoring of dissolved gas in transformer oil through a pipeline.

6. The sampling device for extracting and detecting dissolved gas in transformer oil according to claim 2, characterized in that: The piston rod (2) is configured to include a disc portion (21) and a tube portion (22), and the lower end of the tube portion (22) is configured to be connected to the center portion of the disc portion (21) in a through-type manner, the upper end of the tube portion (22) is configured to be connected to the box cylinder (1) in a through-type manner, and the peripheral side portion of the disc portion (21) is configured to be connected to the box cylinder (1) in a contact-type manner, and the upper end of the tube portion (22) is configured to be connected to the three-way valve I (3). Alternatively, the disk portion (21) is configured as a circular block and the tube portion (22) is configured as a circular cylindrical body, Alternatively, the ball valve (4) is configured as a manual ball valve and one of its ports is configured to be communicatively connected to the cylinder (1), another of its ports is configured to be communicatively connected to the air pump (6) via a first pipe and a second pipe, and another of its ports is configured to be communicatively connected to the pressure gauge (7) via a third pipe. Alternatively, the air pump (6) is configured as a pump-shaped body having an air extraction port and an air charging port, and the air extraction port and the air charging port of the air pump (6) are respectively configured to be communicatively connected to the ball valve (4). Alternatively, the pressure gauge (7) is configured as a pointer pressure gauge and the contact port portion of the pressure gauge (7) is configured to be communicatively connected to the ball valve (4).

7. The sampling device for extracting and detecting dissolved gas in transformer oil for online monitoring according to any one of claims 1 to 6, characterized in that: The box cylinder (1) and the piston rod (2) are arranged in a manner of being distributed in an external pump body with the three-way valve I (3), the ball valve (4), the three-way valve II (5), the air pump (6), the pressure gauge (7) and the oil pump (8). Alternatively, the center line of the cylinder (1), the center line of the piston rod (2) and the center line of the three-way valve I (3) are arranged on the same straight line, and the pipe portion (22) is arranged to be connected to the accommodating hole body (11).

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