Transformer oil standard oil sample configuration auxiliary device capable of avoiding upper cavity of oil cylinder

Abstract

The utility model relates to the technical field of electric power engineering, in particular to a transformer oil standard oil sample configuration auxiliary device capable of avoiding an upper cavity of an oil cylinder, which comprises the oil cylinder, a piston arranged in the oil cylinder, an oil inlet channel arranged in the middle of the piston, one end of the oil inlet channel communicated with the oil cylinder, and the other end of the oil inlet channel connected with an oil inlet pipeline. The detection channel is connected with a detection pipeline, the other end of the detection pipeline is connected to the bottom of a liquid level tank, the top of the liquid level tank is connected with a connecting rod floating ball liquid level switch and further connected with an overflow pipeline, and a third control valve is arranged on the detection pipeline. By adopting the matching of the liquid level tank, the connecting rod floating ball liquid level switch and the like, the oil cylinder can be ensured to be fully filled with oil, and a cavity is prevented from being formed in the oil cylinder, so that the gear pump can be prevented from idling in a standard oil sample configuration process.

Description

Technical Field

[0001] This utility model relates to the field of power engineering technology, specifically an auxiliary device for preparing standard oil samples of transformer oil to avoid the empty cavity in the upper part of the oil cylinder. Background Technology

[0002] The currently accepted method for calibrating online chromatographs is to use a standard oil containing a specific concentration of standard gas. The preparation of the standard oil is crucial for the calibration of the online chromatograph. Preparing the standard oil requires passing a certain amount of standard gas through the oil sample; this operation necessitates the use of a standard oil sample preparation device.

[0003] The applicant filed a patent application in 2018 for a "standard oil sample preparation device that facilitates rapid absorption of mixed standard gas," with authorization publication number CN208013156U. This standard oil sample preparation device includes an oil cylinder containing a piston. An oil inlet channel is located in the middle of the piston and communicates with the oil cylinder. The top of the oil cylinder and the oil inlet channel of the piston are connected to both ends of a circulation pipeline. A standard gas inlet, a gear pump, and an oil-gas mixer are sequentially connected to the circulation pipeline. Upon startup, oil is first injected into the oil cylinder through the piston's oil inlet channel until the cylinder is full. A level sensor can be installed at the top of the oil cylinder to detect whether it is full. When the cylinder is detected to be full, the gear pump activates, circulating the oil and mixing it with the standard gas. However, in actual operation, when the oil is injected into the cylinder, there is often a certain amount of oil foam on the upper surface of the oil. When the oil foam comes into contact with the level sensor, it can sometimes trigger the level sensor. At this time, the level sensor feeds back to the system, and the system will shut off the oil inlet valve of the cylinder to stop the oil supply. However, the oil does not completely fill the cylinder, resulting in a cavity at the top of the cylinder. At this time, the gear pump has already started and is trying to draw oil out from the top of the cylinder, which will result in the gear pump running dry, and the entire oil sample preparation process cannot proceed normally. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide an auxiliary device for preparing standard oil samples of transformer oil to avoid the empty cavity in the upper part of the oil cylinder.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] An auxiliary device for preparing standard transformer oil samples to avoid the upper cavity of the cylinder includes a cylinder with a piston inside. The piston has an oil inlet channel in the middle, one end of which is connected to the cylinder and the other end is connected to an oil inlet pipe. A detection channel is provided on the top of the cylinder, which is connected to a detection pipe. The other end of the detection pipe is connected to the bottom of a level tank. A connecting rod float level switch is connected to the top of the level tank, and an overflow pipe is also connected to the top of the level tank. A third control valve is provided on the detection pipe.

[0007] In the above structure, the detection mechanism is located outside the oil cylinder. After the oil and oil foam in the cylinder overflow, they gradually enter the level tank through the detection channel and pipe. Only when the oil level in the level tank reaches the set level will the linkage float level switch be triggered. Specifically, since the linkage float level switch is a mechanically triggered structure, a large buoyancy force from the liquid is required to trigger the float's movement. If the level tank only contains oil foam, it cannot drive the float. Therefore, if the linkage float level switch is triggered, it indicates that there is oil in the level tank, thus indicating that the oil cylinder is full. The detection results obtained by this method are more accurate. This method can avoid the formation of cavities in the oil cylinder and prevent the gear pump from running dry during the standard oil sample preparation process.

[0008] The bottom of the level tank is connected to a bottom pipe, and both the overflow pipe and the bottom pipe are connected to the auxiliary oil tank. After the oil cylinder is filled with oil, the oil and oil foam will enter the level tank. The overflow pipe can drain the oil foam or excess oil from the level tank to avoid affecting the test results. After operation, the bottom pipe of the level tank is used to empty the oil. The auxiliary oil tank is used to receive the oil.

[0009] The top of the auxiliary oil tank is connected to a first vacuum pipe, which in turn connects to a vacuum pump. A first control valve is installed on the first vacuum pipe. Vacuuming at the top of the auxiliary oil tank creates negative pressure inside, facilitating the complete drainage of oil from the level tank.

[0010] The bottom of the auxiliary oil tank is connected to an oil drain pipe for draining oil; the top of the auxiliary oil tank is connected to a pressure relief pipe for assisting in pressure relief.

[0011] For ease of control, control valves are installed on the oil inlet pipe, bottom pipe, oil outlet pipe, and pressure relief pipe.

[0012] The vacuum pump is connected to a second vacuum extraction pipe, which is connected to a gas passage at the bottom of the oil cylinder. A second control valve is installed on the second vacuum extraction pipe. The vacuum pump can evacuate the inside of the oil cylinder (the cavity below the piston) through the second vacuum extraction pipe and the gas passage, thereby driving the piston downward and ensuring that the piston descends completely to the bottom of the oil cylinder.

[0013] The gas passage at the bottom of the hydraulic cylinder is connected to an air intake pipe, which in turn is connected to an air pump. The air pump injects air into the interior of the hydraulic cylinder (the cavity below the piston) through the air intake pipe and the gas passage, thereby driving the piston to move upward.

[0014] In situations with special requirements, both of the above structures facilitate flexible control and operation of the hydraulic cylinder and piston.

[0015] The testing pipeline is connected to a sampling pipeline, and a sampling valve is installed on the sampling pipeline to facilitate the sampling and testing of oil samples to determine whether they meet the standards for oil.

[0016] The beneficial effects achieved by this utility model are:

[0017] This invention employs a combination of a level tank, a connecting rod float level switch, and other structures to ensure that the oil cylinder is completely filled with oil, preventing the formation of cavities within the oil cylinder and thus avoiding the gear pump running dry during the preparation of standard oil samples. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] In the diagram: 1. Oil inlet pipe; 2. Oil inlet channel; 3. Piston; 4. Oil cylinder; 5. Detection channel; 6. Detection pipe; 7. Sampling pipe; 8. Third control valve; 9. Connecting rod float level switch; 10. Level tank; 11. Overflow pipe; 12. Bottom pipe; 13. Auxiliary oil tank; 14. Pressure relief pipe; 15. First vacuum pipe; 16. Oil drain pipe; 17. First control valve; 18. Vacuum pump; 19. Second control valve; 20. Second vacuum pipe; 21. Air inlet pipe; 22. Air pump; 23. Gas channel. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Example:

[0023] like Figure 1As shown, an auxiliary device for preparing standard transformer oil samples to avoid the upper cavity of the cylinder includes a cylinder 4, a piston 3 inside the cylinder 4, an oil inlet channel 2 in the middle of the piston 3, one end of the oil inlet channel 2 is connected to the cylinder 4, and the other end is connected to the oil inlet pipe 1. A detection channel 5 is opened at the top of the cylinder 4, and the detection channel 5 is connected to the detection pipe 6. The other end of the detection pipe 6 is connected to the bottom of the liquid level tank 10. A connecting rod float liquid level switch 9 is connected to the top of the liquid level tank 10, and an overflow pipe 11 is also connected to the top of the liquid level tank 10. A third control valve 8 is provided on the detection pipe 6.

[0024] In the above structure, the detection structure is set outside the oil cylinder 4. After the oil and oil foam in the oil cylinder 4 are full, they gradually enter the bottom of the liquid level tank 10 through the detection channel 5 and the detection pipe 6. Only when the oil in the liquid level tank 10 reaches the set liquid level can the linkage float liquid level switch 9 be triggered.

[0025] The linkage float level switch 9 is a safe, reliable, easy-to-use, and simple level controller. As an existing product, the linkage float level switch 9 uses magnetic force, has no mechanical connecting parts, and operates simply and reliably. When the float of the measured medium floats, the float moves the main body, and simultaneously, the magnet at the other end of the float controls the magnet on the switch's action rod.

[0026] Since the linkage float level switch 9 requires buoyancy from the liquid to trigger its float action, if the level tank 10 only contains oil foam, it cannot drive the float. Therefore, if the linkage float level switch 9 is triggered, it indicates the presence of oil in the level tank 10, thus indicating that the oil cylinder 4 is full of oil. The detection results obtained by the above-mentioned detection method are more accurate. This method can avoid the formation of cavities in the oil cylinder 4 and prevent the gear pump from running dry during the standard oil sample preparation process.

[0027] The bottom of the level tank 10 is connected to a bottom pipe 12, and both the overflow pipe 11 and the bottom pipe 12 are connected to the auxiliary oil tank 13. After the oil cylinder 4 is filled with oil, the oil and oil foam will enter the level tank 10. The overflow pipe 11 can drain the oil foam or excess oil from the level tank 10 to avoid affecting the test results. After the operation is completed, the bottom pipe 12 of the level tank 10 is used to drain the oil. The auxiliary oil tank 13 is used to receive the above-mentioned oil.

[0028] The top of the auxiliary oil tank 13 is connected to a first vacuum pipe 15, which in turn connects to a vacuum pump 18. A first control valve 17 is installed on the first vacuum pipe 15. Vacuuming the top of the auxiliary oil tank 13 creates negative pressure inside, facilitating the complete discharge of oil from the level tank 10. Furthermore, before the oil enters the oil cylinder 4, a vacuum can be created inside the oil cylinder 4 via the auxiliary oil tank 13, level tank 10, detection pipe 6, and detection channel 5 to prevent contamination of the oil by other gases.

[0029] The bottom of the auxiliary oil tank 13 is connected to the oil drain pipe 16 for draining oil; the top of the auxiliary oil tank 13 is connected to the pressure relief pipe 14 for assisting in pressure relief.

[0030] For ease of control, control valves are installed on the oil inlet pipe 1, bottom pipe 12, oil outlet pipe 16 and pressure relief pipe 14, and all control valves are solenoid valves.

[0031] The vacuum pump 18 is connected to the second vacuum pipe 20, which is connected to the gas channel 23 at the bottom of the cylinder 4. A second control valve 19 is installed on the second vacuum pipe 20. The vacuum pump 18 can evacuate the inside of the cylinder 4 (the cavity below the piston 3) through the second vacuum pipe 20 and the gas channel 23, thereby driving the piston 3 to move downward and ensuring that the piston 3 descends completely to the bottom of the cylinder 4.

[0032] The gas passage 23 at the bottom of the hydraulic cylinder 4 is connected to the air intake pipe 21, and the air intake pipe 21 is connected to the air pump 22. The air pump 22 injects air into the interior of the hydraulic cylinder 4 (the cavity below the piston 3) through the air intake pipe 21 and the gas passage 23, thereby driving the piston 3 to move upward.

[0033] In cases of special requirements, both of the above structures facilitate flexible control and operation of the hydraulic cylinder 4 and piston 3.

[0034] According to the existing standard oil sample preparation device, the top of the oil cylinder 4 is also connected to a circulation pipeline (described in CN208013156U), which is omitted from the drawings of this utility model.

[0035] The first control valve 17, the second control valve 19, and the third control valve 8 are all solenoid valves.

[0036] The detection pipeline 6 is connected to a sampling pipeline 7, and a sampling valve is installed on the sampling pipeline 7 to facilitate the sampling and testing of oil samples to determine whether they are standard oils.

[0037] In this utility model, when the connecting rod float level switch 9 is triggered, it indicates that the oil cylinder 4 is full of oil. At this time, a feedback signal is sent to the system, and the gear pump is started according to the configuration structure described in CN208013156U (omitted in the attached drawings of this utility model) to mix the oil and standard gas, thereby preparing a standard oil sample.

Claims

1. A transformer oil standard oil sample configuration auxiliary device for avoiding the upper cavity of the oil cylinder, comprising an oil cylinder (4), a piston (3) is arranged in the oil cylinder (4), an oil inlet channel (2) is arranged in the middle of the piston (3), one end of the oil inlet channel (2) is communicated with the oil cylinder (4), and the other end is connected with an oil inlet pipeline (1), characterized in that, The top of the cylinder (4) is provided with a detection channel (5), which is connected to a detection pipe (6). The other end of the detection pipe (6) is connected to the bottom of the level tank (10). The top of the level tank (10) is connected to a connecting rod float level switch (9), and the top of the level tank (10) is also connected to an overflow pipe (11). A third control valve (8) is provided on the detection pipe (6).

2. The transformer oil standard oil sample configuration aid to avoid the upper cavity of the oil cylinder according to claim 1, characterized in that, The bottom of the liquid level tank (10) is connected to the bottom pipe (12), and both the overflow pipe (11) and the bottom pipe (12) are connected to the auxiliary oil tank (13).

3. The transformer oil standard oil sample configuration aid to avoid the upper cavity of the oil cylinder according to claim 2, characterized in that, The top of the auxiliary oil tank (13) is connected to the first vacuum pipe (15), and the vacuum pump (18) is connected through the first vacuum pipe (15). A first control valve (17) is installed on the first vacuum pipe (15).

4. The transformer oil standard oil sample configuration aid to avoid the upper cavity of the oil cylinder according to claim 2 or 3, characterized in that, The bottom of the auxiliary oil tank (13) is connected to the oil drain pipe (16), and the top of the auxiliary oil tank (13) is connected to the pressure relief pipe (14).

5. The transformer oil standard oil sample configuration aid to avoid the upper cavity of the oil cylinder according to claim 4, characterized in that, Control valves are respectively installed on the oil inlet pipe (1), bottom pipe (12), oil outlet pipe (16) and pressure relief pipe (14).

6. The transformer oil standard oil sample configuration aid to avoid the upper cavity of the oil cylinder according to claim 3, characterized in that, The vacuum pump (18) is connected to the second vacuum pipe (20), the second vacuum pipe (20) is connected to the gas channel (23) at the bottom of the oil cylinder (4), and a second control valve (19) is provided on the second vacuum pipe (20).

7. The auxiliary device for preparing standard transformer oil samples to avoid cavitation in the upper cavity of the cylinder according to claim 6, characterized in that, The gas passage (23) at the bottom of the oil cylinder (4) is connected to the air intake pipe (21), and the air intake pipe (21) is connected to the air pump (22).

8. The transformer oil standard oil sample configuration aid to avoid the upper cavity of the oil cylinder according to claim 1, characterized in that, The detection pipeline (6) is connected to a sampling pipeline (7), and a sampling valve is installed on the sampling pipeline (7).

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