Sealing oil extraction device and method for oil injection equipment

Abstract

The invention discloses a sealing oil taking device and method for oil injection equipment, and relates to the technical field of oil injection equipment sampling, the sealing oil taking device comprises a shell, and a vacuum pump, a vacuum bin, an oil drain pump, a buffer tank, a sampling needle cylinder, a plurality of electronic valves and a control unit which are arranged on the shell; the shell is provided with an oil inlet, an oil taking port, an oil taking port and an oil discharging port. One end of the buffer pump is communicated with the oil inlet, the other end of the buffer pump is communicated with the oil discharge pump, the other end of the oil discharge pump is connected with the oil discharge port, one end of the vacuum bin is communicated with the oil inlet and the oil taking port, the other end of the vacuum bin is communicated with the buffer tank, the buffer tank is further connected with a vacuum pump, the vacuum pump is communicated with the exhaust port, and the sampling needle cylinder is connected with the oil taking port; a second electronic valve is arranged at the oil inlet, a third electronic valve is arranged at the oil taking port, a fourth electronic valve is arranged at one end of the vacuum bin, a fifth electronic valve is arranged between the other end of the vacuum bin and the buffering tank, a sixth electronic valve is arranged between the oil discharging pump and the buffering tank, and a seventh electronic valve is arranged between the buffering tank and the oil inlet. The controller is used for controlling the vacuum pump, the oil drain pump and the electronic valves. According to the invention, the normalization of the taken oil sample is ensured, the misjudgment of the equipment operation condition and the unnecessary retest caused by the nonstandard taken oil sample of oil injection equipment / parts such as a main transformer, a high-voltage reactor and a sleeve are avoided, and the safe and stable operation level of an electric power system is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil extraction from oil injection equipment, and in particular to a sealing oil extraction device for oil injection equipment and a method thereof. Background Art

[0002] The insulating oil sample test of oil filling equipment is an important means to obtain the operating conditions of the equipment. Whether the insulating oil sample used in the test meets the specifications directly affects the judgment of the operating conditions of the equipment. In view of the importance of insulating oil sampling, the sampling process is required to be fully sealed when testing the moisture content of insulating oil, dissolved gas component content in insulating oil, gas content in insulating oil and other tests of oil filling equipment such as main transformers and high-voltage reactors, that is, the dissolved water and gas in the oil cannot escape, and the air cannot be mixed in. However, although the oil is fully sealed as required during daily sampling, the removal of bubbles in the pipeline and syringe is an operation for naked eye observation, and some dead corners of the pipeline and syringe still have tiny bubbles that are not easy to detect. When the bubbles in the syringe rubber cap are manually squeezed, there may still be residual bubbles that have not been discharged. During the rubber cap squeezing process, the oil sample remaining from the previous sampling on the gloves is easy to enter the rubber cap, causing contamination. The distortion of the sample taken has a direct impact on the test results. There have been cases where acetylene was detected as dissolved gas in the oil due to oil sample contamination. The test of gas content in insulating oil often fails to meet the test results due to residual bubbles, which may cause misjudgment of the operating conditions of the equipment. The existing oil sampling method also has the risk of the hose falling into the bushing when taking oil samples from the transformer bushing. Summary of the invention

[0003] In view of the above shortcomings, the present invention provides a sealing oil extraction device and method for oil filling equipment, which can be easily carried, quickly connected and used, ensure the standardization of the test oil sample, and prevent misjudgment of the equipment operating condition. The specific technical solution is as follows:

[0004] A sealed oil extraction device for oil injection equipment, comprising a housing and a vacuum pump, a vacuum chamber, an oil discharge pump, a buffer tank, a sampling syringe, a plurality of electronic valves and a control unit arranged on the housing;

[0005] The shell is provided with an oil inlet, an oil outlet, an oil outlet and an oil discharge outlet;

[0006] One end of the buffer pump is connected to the oil inlet, and the other end is connected to the oil discharge pump, the other end of the oil discharge pump is connected to the oil discharge port, one end of the vacuum chamber is connected to the oil inlet and the oil extraction port, the other end of the vacuum chamber is connected to the buffer tank, the buffer tank is also connected to a vacuum pump, the vacuum pump is connected to the exhaust port, and the sampling syringe is connected to the oil extraction port;

[0007] The oil inlet is provided with a No. 2 electronic valve, the oil extraction port is provided with a No. 3 electronic valve, one end of the vacuum chamber is provided with a No. 4 electronic valve, the other end is provided with a No. 5 electronic valve between the buffer tank, the oil discharge pump and the buffer tank are provided with a No. 6 electronic valve, and the buffer tank and the oil inlet are provided with a No. 7 electronic valve;

[0008] The control is used to control the vacuum pump, the oil drain pump and a plurality of electronic valves.

[0009] Preferably, the vacuum pump and the oil drain pump are both provided with a starting valve, and the control unit controls the vacuum pump and the oil drain pump via the starting valve.

[0010] Preferably, a limiting groove is provided on the vacuum chamber, a sealing ring is sleeved on the limiting groove, a rubber cap is arranged in the limiting groove, and a setting pin is inserted into the rubber cap.

[0011] Preferably, a one-way valve is further provided between the oil discharge pump and the oil discharge port, and the control unit controls the one-way valve.

[0012] Preferably, a syringe bracket is further provided at the bottom of the sampling syringe, and the bracket includes a rotating motor, a motor bracket, a support frame, a syringe propulsion push rod and a syringe bracket;

[0013] The rotating motor is arranged on the motor bracket, the supporting frame is connected to the rotating motor, one end of the sampling syringe is fixed on the syringe bracket, and the other end is movably connected to the supporting frame, the syringe propulsion push rod is fixed to the bottom of the syringe bracket, and the syringe propulsion push rod is slidably connected to the supporting frame.

[0014] Preferably, it also includes an oil extraction valve cannula, one end of which is connected to the oil inlet, and the other end is provided with a clamp, and the bottom of the clamp is provided with a conical oil-resistant plug.

[0015] A method for extracting oil from oil injection equipment through sealing, which is implemented by the device described in any one of claims 1 to 6, comprising: extracting oil from equipment with an oil extraction valve, specifically:

[0016] S1, close the No. 1 electronic valve and the No. 6 electronic valve on the oil extraction valve device, open the No. 2, No. 3, No. 4, No. 5 and No. 7 electronic valves, and start the vacuum pump to evacuate the equipment oil removal valve, pipeline and sampling syringe;

[0017] S2, close the No. 3, No. 4, No. 5 and No. 6 electronic valves, open the No. 1, No. 2 and No. 7 electronic valves, and rinse the pipeline;

[0018] S3, close the No. 3, No. 4 and No. 5 electronic valves, open the No. 1, No. 2, No. 6 and No. 7 electronic valves, and remove the transformer oil in the dead zone of the equipment;

[0019] S4, close the No. 2, No. 3, No. 4, No. 6 and No. 7 electronic valves, open the No. 1 and No. 5 electronic valves, and start the vacuum pump to evacuate the rubber cap vacuum chamber;

[0020] S5. Close the No. 3, No. 5, No. 6 and No. 7 electronic valves, open the No. 1, No. 2 and No. 4 electronic valves, and let the equipment oil sample enter the pipeline and the rubber cap vacuum chamber for flushing;

[0021] S6, repeat the above steps S4 and S5 once;

[0022] S7, execute step S4 for a short time, the oil level in the vacuum chamber drops a part, and the vacuum chamber is tightly covered after the rubber cap is manually placed;

[0023] S8, after the rubber cap is placed, repeat steps S4 and S5 once again to complete the oil filling of the rubber cap;

[0024] S9, close the No. 4, No. 5, No. 6 and No. 7 electronic valves, open the No. 1, No. 2 and No. 3 electronic valves, and rinse the syringe;

[0025] S10, close the No. 2, No. 4, No. 5 and No. 6 electronic valves, open the No. 1, No. 3 and No. 7 electronic valves, start the vacuum pump to remove the transformer oil in the syringe and briefly evacuate;

[0026] S11, close the No. 2, No. 3, No. 4, No. 5 and No. 7 electronic valves, open the No. 6 electronic valve, and start the oil drain pump to drain the transformer oil from the buffer bin;

[0027] S12, repeat the above steps S9 and S10 once, push open the vacuum chamber cover plate where the rubber cap is placed, remove the syringe, seal the syringe, and then cover the vacuum chamber cover plate;

[0028] S13, close the No. 1 electronic valve, remove the equipment oil pipe and the syringe oil pipe, and press the device oil drain button. Open the No. 2, No. 3, No. 4, No. 5, No. 6 and No. 7 electronic valves, start the oil drain pump to drain the residual oil from the pipeline and vacuum chamber and buffer chamber. After the oil is drained, restore the normal pressure and then close all valves.

[0029] For the extraction of equipment without oil extraction valve, the specific steps are as follows:

[0030] S14, close the No. 2 and No. 6 electronic valves, open the No. 3, No. 4 and No. 5 electronic valves, and start the vacuum pump to evacuate the pipeline and the sampling syringe;

[0031] S15, close the No. 3 and No. 6 electronic valves, open the No. 2, No. 4 and No. 5 electronic valves, start the vacuum pump to remove the gas from the pipeline and rinse the pipeline;

[0032] S16, close the No. 2, No. 3 and No. 6 electronic valves, open the No. 4 and No. 5 electronic valves, and start the vacuum pump to evacuate the pipeline;

[0033] S17, close the No. 4 and No. 6 electronic valves, open the No. 2, No. 3 and No. 5 electronic valves, rinse the syringe and start the vacuum pump again to evacuate the vacuum chamber where the rubber cap is placed;

[0034] S18, close the No. 2 and No. 6 electronic valves, open the No. 3, No. 4 and No. 5 electronic valves, start the vacuum pump to remove the transformer oil rinsed in the syringe, and evacuate the sampling syringe, the vacuum chamber where the rubber cap is placed, and part of the pipeline;

[0035] S19, repeat steps 4 and 5 once;

[0036] S20, close the No. 2, No. 3 and No. 5 electronic valves, open the No. 6 electronic valve, and start the oil drain pump to drain the waste oil from the buffer tank;

[0037] S21, close the No. 4, No. 5 and No. 6 electronic valves, open the No. 2 and No. 3 electronic valves, use the pressure difference and the principle of the connecting vessel to complete the syringe oil extraction, and then close the No. 2 and No. 3 electronic valves;

[0038] S22, close the No. 3 and No. 5 electronic valves, open the No. 2 and No. 4 electronic valves, at this time, the vacuum chamber where the rubber cap is placed and part of the pipeline are in a vacuum state, and the pressure difference fills this part with oil, close the No. 2 and No. 4 electronic valves, and light up the indicator light (then push open the vacuum chamber cover where the rubber cap is placed, remove the syringe, seal the syringe, and then cover the vacuum chamber cover;

[0039] S23. Remove the oil pipe and the sampling syringe from the equipment, then press the oil drain button. The No. 2, No. 3, No. 4, No. 5, and No. 6 electronic valves will open, and the oil drain pump will be started to drain the residual oil from the pipeline, vacuum chamber, and buffer chamber. After the oil is drained and the pressure is restored to normal, close the No. 2, No. 3, No. 4, No. 5, and No. 6 electronic valves, and the end light will turn on.

[0040] Preferably, in step S1, the sampling syringe is tilted downward by 60°.

[0041] Preferably, in step S10, the sampling syringe is tilted upward by 60°

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] In the present invention, it is reliably ensured that the oil sample taken has no residual bubbles, and at the same time, the bubbles in the syringe rubber cap are removed by vacuuming to avoid residual bubbles and possible oil sample contamination caused by squeezed bubbles, so as to create a sealed oil extraction condition for oil extraction from the top of the casing, ensure the standardization of the oil sample taken, avoid the main transformer, high-voltage reactor, casing and other oil injection equipment / components due to the non-standard oil sample taken. Misjudgment of equipment operating conditions and unnecessary retesting are avoided, effectively improving the safe and stable operation level of the power system. After using the device, the oil extraction pipeline and syringe exhaust are completed by the device, and the oil discharge port of the device is connected to the oil discharge pipe to be directly discharged into the waste oil barrel. When the casing is used for oil extraction, a sealed waste oil recovery bag can also be connected, so that there is no transformer oil spillage in the entire oil extraction process, ensuring a clean environment while avoiding contamination of the external insulation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0045] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0046] Figure 2 It is a top view in the present invention;

[0047] Figure 3 It is a schematic diagram of the working principle of the present invention;

[0048] Figure 4 This is a schematic diagram of the vacuum chamber structure.

[0049] 1-housing, 2-vacuum pump, 3-oil drain pump, 4-buffer tank, 5-sampling syringe, 6-electronic valve, 7-oil inlet, 8-oil extraction port, 9-exhaust port, 10-oil drain port, 11-vacuum chamber, 12-check valve, 13-rotating motor, 14-motor bracket, 15-support frame, 16-syringe push rod, 17-syringe bracket, 18-oil extraction valve insert, 19-hoop, 20-conical oil-resistant plug, 21-display, 22-limiting groove, 23-pin. DETAILED DESCRIPTION

[0050] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0052] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0053] In the description of the present invention, 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 connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. 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.

[0054] Example 1

[0055] Please participate Figure 1-4 , a sealing oil extraction device for oil injection equipment, comprising a shell 1 and a vacuum pump 2, a vacuum chamber 11, an oil discharge pump 3, a buffer tank 4, a sampling syringe 5, a plurality of electronic valves 6 and a control unit arranged on the shell 1;

[0056] The housing 1 is provided with an oil inlet 7, an oil extraction port 8, an exhaust port 9 and an oil discharge port 10;

[0057] One end of the buffer pump is connected to the oil inlet 7, and the other end is connected to the oil discharge pump 3, the other end of the oil discharge pump 3 is connected to the oil discharge port 10, one end of the vacuum chamber 11 is connected to the oil inlet 7 and the oil extraction port 8, the other end of the vacuum chamber 11 is connected to the buffer tank 4, the buffer tank 4 is also connected to the vacuum pump 2, the vacuum pump 2 is connected to the exhaust port 9, and the sampling syringe 5 is connected to the oil extraction port 8;

[0058] The oil inlet 7 is provided with a No. 2 electronic valve 6, the oil extraction port 8 is provided with a No. 3 electronic valve 6, one end of the vacuum chamber 11 is provided with a No. 4 electronic valve 6, the other end is provided with a No. 5 electronic valve 6 between the buffer tank 4, the oil discharge pump 3 is provided with a No. 6 electronic valve 6 between the buffer tank 4, and the buffer tank 4 is provided with a No. 7 electronic valve 6 between the oil inlet 7;

[0059] The control is used to control the vacuum pump 2 , the oil drain pump 3 and a plurality of electronic valves 6 .

[0060] As a preferred solution, the vacuum pump 2 and the oil drain pump 3 are both provided with a starting valve, and the control unit controls the vacuum pump 2 and the oil drain pump 3 via the starting valve.

[0061] As a preferred solution, a limiting groove 22 is provided on the vacuum chamber 11 , a sealing ring is sleeved on the limiting groove 22 , a rubber cap is arranged in the limiting groove 22 , and a setting pin 23 is inserted into the rubber cap.

[0062] As a preferred solution, a one-way valve 12 is further provided between the oil discharge pump 3 and the oil discharge port 10 , and the control unit controls the one-way valve 12 .

[0063] As a preferred solution, a syringe support 17 is further provided at the bottom of the sampling syringe 5, and the support includes a rotating motor 13, a motor support 14, a support frame 15, a syringe push rod 16 and a syringe support 17;

[0064] The rotating motor 13 is arranged on the motor bracket 14, the supporting frame 15 is connected to the rotating motor 13, one end of the sampling syringe 5 is fixed on the syringe bracket 17, and the other end is movably connected to the supporting frame 15, and the syringe propulsion push rod 16 is fixed to the bottom of the syringe bracket 17, and the syringe propulsion push rod 16 is slidably connected to the supporting frame 15.

[0065] As a preferred solution, an oil extraction valve cannula 18 is further included, one end of which is connected to the oil inlet 7, and the other end is provided with a clamp 19, and the bottom of the clamp 19 is provided with a conical oil-resistant plug 20.

[0066] Example 2

[0067] like Figure 2 As shown, it should be noted that the electronic valves No. 1 to No. 7 mentioned above correspond to valves 1 to 7.

[0068] A sealing oil extraction method for oil injection equipment, comprising:

[0069] (1) Equipment of oil extraction valve: do not install the rubber cap first; fix the valve 1 and the oil extraction pipe of the oil inlet of the device with a bayonet, otherwise it is easy to fall off; install the syringe on the device bracket and tilt it downward by 60°. The specific steps include:

[0070] Step 1: Valve 1 and valve 6 are closed, valve 2, valve 3, valve 4, valve 5 and valve 7 are opened, and the vacuum pump is started to evacuate the oil extraction valve, pipeline and sampling syringe of the oil injection equipment; this step is time-controlled, and it automatically switches to step 2 after the set time is reached;

[0071] Step 2: Close valves 3, 4, 5 and 6, and open valves 1, 2 and 7 to rinse the pipeline. There may be a small amount of air after opening valve 1, and the purpose is to remove this part of the air. This step is time controlled.

[0072] Step 3, valve 3, valve 4, valve 5 are closed, valve 1, valve 2, valve 6, valve 7 are opened, and transformer oil in the dead zone of the equipment is discharged; the power of the oil drain pump should not be too large, and the pressure of the oil drain port should be close to the oil pressure of the equipment sampling valve, otherwise the pressure difference in the negative pressure area of ​​the pipeline is too large and it is easy to enter air; time control is entered, and manual switching is entered into the next step. The dead zone volume of each device is different;

[0073] Step 4: Close valves 2, 3, 4, 6 and 7, open valves 1 and 5, and start the vacuum pump to evacuate the vacuum chamber of the rubber cap. Time control and vacuuming without a syringe can improve the vacuum degree and ensure that there is no air in the vacuum chamber;

[0074] Step 5: Valve 3, valve 5, valve 6, and valve 7 are closed, valve 1, valve 2, and valve 4 are opened, and the equipment oil sample enters the pipeline and the rubber cap vacuum chamber for flushing (time control);

[0075] Step 6: Repeat steps 4 and 5 once (the buffer bin can accommodate the volume);

[0076] Step 7, execute step 4 but for a shorter time, the oil level in the rubber cap vacuum bin will drop a little, the rubber cap light will be on, manually open the rubber cap vacuum bin, place the rubber cap and cover the vacuum bin tightly;

[0077] Step 8. Click the button to complete the placement of the rubber cap, and repeat steps 4 and 5 once to complete the filling of the rubber cap;

[0078] Step 9, valves 4, 5, 6 and 7 are closed, valves 1, 2 and 3 are opened, and the syringe is rinsed (do not rinse the syringe more than 80ml and try to control it within 60ml, otherwise the core plug may fall off and affect the seal. This step takes a short time and relies on the oil pressure of the equipment to take oil. The oil pressure at valve 1 is inconsistent. Consider adding a travel relay of the core plug 60ml at the syringe bracket and adding a clip at 70ml of the syringe for protection);

[0079] Step 10, valve 2, valve 4, valve 5, valve 6 are closed, valve 1, valve 3, valve 7 are opened, and the vacuum pump is started to remove the transformer oil rinsed in the syringe and briefly evacuate (if necessary, the syringe bracket is turned to tilt upward by 60°, and a pull rod is set on the bracket to slowly push the core plug);

[0080] Step 11: Close valves 2, 3, 4, 5 and 7, open valve 6, and start the oil drain pump to drain the transformer oil from the buffer tank.

[0081] Step 12, repeat steps 9, 10, and 9 once (i.e. rinse once more to complete the oil extraction, when the syringe is downward at 60°, the core plug can move freely without hindrance); push open the vacuum chamber cover plate where the rubber cap is placed, remove the syringe, seal the syringe, and then cover the vacuum chamber cover plate;

[0082] Step 13, close valve 1, remove the equipment oil pipe and syringe oil pipe, then press the device oil drain button, open valves 2, 3, 4, 5, 6 and 7, start the oil drain pump to drain the residual oil from the pipeline, vacuum chamber and buffer chamber, and after the oil is drained and the pressure is restored to normal, close all valves and the end light will come on.

[0083] (2) Equipment without oil extraction valve such as casing:

[0084] Step 1: Close valve 2 and valve 6, open valve 3, valve 4 and valve 5, and start the vacuum pump to evacuate the pipeline and sampling syringe;

[0085] Step 2: Close valve 3 and valve 6, open valve 2, valve 4 and valve 5, start the vacuum pump to remove gas from the pipeline and rinse the pipeline (time control, the length of the oil pipe connecting the oil inlet of the device is required to be fixed at 50-60cm);

[0086] Step 3: Close valves 2, 3 and 6, open valves 4 and 5, and start the vacuum pump to evacuate the pipeline;

[0087] Step 4, valve 4 and valve 6 are closed, valve 2, valve 3 and valve 5 are opened, the syringe is rinsed (using the pressure difference and the principle of the connecting vessel, the oil extraction device is placed about 40cm below the oil level of the equipment), and the vacuum pump is started again to evacuate the vacuum chamber where the rubber cap is placed (the syringe angle and control method are the same as those of the equipment with oil extraction valve, and the following steps with similar contents are handled in the same way);

[0088] Step 5: Valve 2 and valve 6 are closed, valve 3, valve 4 and valve 5 are opened, and the vacuum pump is started to remove the transformer oil rinsed in the syringe, and the sampling syringe, the vacuum chamber where the rubber cap is placed, and part of the pipeline are evacuated;

[0089] Step 6, repeat steps 4 and 5 once (considering that the casing oil chamber is small, reduce the number of lubrication steps. Note: this step is different from the equipment with oil extraction valve. There is no dead zone oil in the casing oil, so it does not need to be removed).

[0090] Step 7: Valve 2, valve 3, and valve 5 are closed, valve 6 is opened, and the oil drain pump is started to drain the waste oil from the buffer tank;

[0091] Step 8, valves 4, 5 and 6 are closed, valves 2 and 3 are opened, and the oil extraction from the syringe is completed by using the pressure difference and the principle of the communicating vessel (the oil extraction device is placed about 40 cm below the oil level of the equipment), and valves 2 and 3 are closed after completion;

[0092] Step 9, valve 3 and valve 5 are closed, valve 2 and valve 4 are opened, at this time, the vacuum chamber and part of the pipeline where the rubber cap is placed are in a vacuum state, and the pressure difference fills the part with oil, close valve 2 and valve 4, light up the indicator light (time control can be considered), then push open the vacuum chamber cover where the rubber cap is placed, remove the syringe, seal the syringe, and then cover the vacuum chamber cover;

[0093] Step 10. After removing the equipment oil pipe and syringe oil pipe, press the device oil drain button, valve 2, valve 3, valve 4, valve 5, valve 6 open, start the oil drain pump to discharge the residual oil in the pipeline and vacuum chamber, and buffer chamber. After the oil is drained and the pressure is restored to normal, close valve 2, valve 3, valve 4, valve 5, valve 6, and the end light will turn on.

[0094] When using this embodiment to extract oil from the upper part of the casing, a special joint for extracting oil from the top of the casing is used. The joint for extracting oil from the top of the casing is a conical oil-resistant plug, which can be applied to oil extraction ports of different calibers and is easy to install. A small hole is reserved in the center of the plug, and the oil extraction hose passes through the small hole and is fastened with a clamp on the outside of the plug to prevent it from falling off. When extracting oil, one end of the oil extraction pipe is inserted into the casing and the plug is plugged, and the other end of the oil extraction pipe is connected to the device.

[0095] It is also noted that there are 4 external interfaces in this embodiment, namely, the oil inlet, the oil extraction port, the oil discharge port, and the exhaust port. The oil inlet of the device is connected to the oil extraction pipe connected to the oil extraction valve of the oil injection equipment, and the length of the pipe is the specified length of the device (time control requirement); the oil extraction port of the device is connected to the oil extraction pipe connected to the sampling syringe, and the length of the pipe is the specified length of the device (time control requirement); the oil discharge port of the device is connected to the oil discharge pipe connected to the waste oil barrel and the waste oil recovery bag.

[0096] The vacuum chamber for placing the rubber cap: It is installed in the vacuum pipeline (between valve 4 and valve 5 in the schematic diagram) to facilitate internal cleaning. The vacuum chamber slides open and closed, and the oil-resistant O-ring installed in the groove is pressed and sealed. If necessary, a sliding cover is designed to tighten the lock. In order to prevent the rubber cap from being sucked up during vacuuming, a small pin is designed to clamp the rubber cap. The pin is located on the inside of the sealing ring. The pipeline near valve 4 is above the vacuum chamber, and the pipeline near valve 5 is below the vacuum chamber. A positioning groove for placing the rubber cap is set in the vacuum chamber to limit the rubber cap. The rubber cap does not fill the vacuum chamber to avoid clogging the pipeline during vacuuming.

[0097] Syringe angle adjustment: A syringe bracket with automatic angle adjustment is installed on the shell. After the sampling syringe is snapped into the bracket buckle, the device uses a servo or stepper motor to adjust the angle of the syringe (the needle nozzle is upward when exhausting and the needle nozzle is tilted downward when taking oil). The syringe angle adjustment drive is synchronized with vacuum extraction / oil taking.

[0098] The control of the vacuum pump start valve and the electronic valve of the pipeline is completed by the control unit. The control unit is connected to a display to display data in real time and can be touched: time control. Since the oil extraction volume of the syringe is 40-60ml, the oil extraction pipe connecting the oil inlet of the device and the oil extraction port of the device is required to be selected according to the length of the device. Therefore, the volume of each pipeline and the syringe is relatively fixed. The purpose of vacuuming is to remove bubbles in the pipeline. There is no need to accurately control the vacuum degree. It is only necessary to ensure that the vacuum degree is within a reasonable range. Therefore, the opening and closing time of each valve is set in combination with the switching logic of the valve to realize the vacuum extraction and oil extraction functions of the device. There is no need to install a vacuum gauge, which can simplify the design and reduce the weight of the device.

[0099] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A sealing oil extraction device for oil filling equipment, characterized in that: It comprises a housing (1), a vacuum pump (2) arranged on the housing (1), a vacuum chamber (11), an oil drain pump (3), a buffer tank (4), a sampling syringe (5), a plurality of electronic valves (6) and a control unit; The housing (1) is provided with an oil inlet (7), an oil extraction port (8), an exhaust port (9) and an oil discharge port (10); One end of the buffer pump is connected to the oil inlet (7), and the other end is connected to the oil discharge pump (3). The other end of the oil discharge pump (3) is connected to the oil discharge port (10). One end of the vacuum chamber (11) is connected to the oil inlet (7) and the oil extraction port (8). The other end of the vacuum chamber (11) is connected to the buffer tank (4). The buffer tank (4) is also connected to a vacuum pump (2). The vacuum pump (2) is connected to the exhaust port (9). The sampling syringe (5) is connected to the oil extraction port (8). The oil inlet (7) is provided with a No. 2 electronic valve (6), the oil extraction port (8) is provided with a No. 3 electronic valve (6), one end of the vacuum chamber (11) is provided with a No. 4 electronic valve (6), the other end is provided with a No. 5 electronic valve (6) between the buffer tank (4), the oil discharge pump (3) and the buffer tank (4) is provided with a No. 6 electronic valve (6), and the buffer tank (4) and the oil inlet (7) are provided with a No. 7 electronic valve (6); The control is used to control the vacuum pump (2), the oil discharge pump (3) and a plurality of electronic valves (6).

2. A sealing oil extraction device for oil filling equipment according to claim 1, characterized in that: The vacuum pump (2) and the oil drain pump (3) are both provided with a starting valve, and the control unit controls the vacuum pump (2) and the oil drain pump (3) via the starting valve.

3. A sealing oil extraction device for oil filling equipment according to claim 1, characterized in that: The vacuum chamber (11) is provided with a limiting groove (22), a sealing ring is sleeved on the limiting groove (22), a rubber cap is arranged in the limiting groove (22), and a setting pin (23) is inserted into the rubber cap.

4. A sealing oil extraction device for oil filling equipment according to claim 1, characterized in that: A one-way valve (12) is also provided between the oil discharge pump (3) and the oil discharge port (10), and the control unit controls the one-way valve (12).

5. The sealing oil extraction device for oil injection equipment according to claim 1, characterized in that: The bottom of the sampling syringe (5) is also provided with a syringe support (17), and the support comprises a rotating motor (13), a motor support (14), a support frame (15), a syringe pushing rod (16) and a syringe support (17); The rotating motor (13) is arranged on the motor bracket (14), the supporting frame (15) is connected to the rotating motor (13), one end of the sampling syringe (5) is fixed on the syringe bracket (17), and the other end is movably connected to the supporting frame (15), and the syringe propulsion push rod (16) is fixed to the bottom of the syringe bracket (17), and the syringe propulsion push rod (16) is slidably connected to the supporting frame (15).

6. A sealing oil extraction device for oil filling equipment according to claim 1, characterized in that: It also comprises an oil extraction valve cannula (18), one end of which is connected to the oil inlet (7), and the other end of which is provided with a clamp (19), and the bottom of which is provided with a conical oil-resistant plug (20).

7. A method for extracting oil from oil filling equipment through sealing, which is implemented by the device according to any one of claims 1 to 6, characterized in that: include: For the extraction of oil with oil extraction valve equipment, the specific steps are: S1, close the No. 1 electronic valve and the No. 6 electronic valve on the oil extraction valve device, open the No. 2, No. 3, No. 4, No. 5 and No. 7 electronic valves, and start the vacuum pump to evacuate the equipment oil removal valve, pipeline and sampling syringe; S2, close the No. 3, No. 4, No. 5 and No. 6 electronic valves, open the No. 1, No. 2 and No. 7 electronic valves, and rinse the pipeline; S3, close the No. 3, No. 4 and No. 5 electronic valves, open the No. 1, No. 2, No. 6 and No. 7 electronic valves, and remove the transformer oil in the dead zone of the equipment; S4, close the No. 2, No. 3, No. 4, No. 6 and No. 7 electronic valves, open the No. 1 and No. 5 electronic valves, and start the vacuum pump to evacuate the rubber cap vacuum chamber; S5. Close the No. 3, No. 5, No. 6 and No. 7 electronic valves, open the No. 1, No. 2 and No. 4 electronic valves, and let the equipment oil sample enter the pipeline and the rubber cap vacuum chamber for flushing; S6, repeat the above steps S4 and S5 once; S7, execute step S4 for a short time, the oil level in the vacuum chamber drops a part, and the vacuum chamber is tightly covered after the rubber cap is manually placed; S8, after the rubber cap is placed, repeat steps S4 and S5 once again to complete the oil filling of the rubber cap; S9, close the No. 4, No. 5, No. 6 and No. 7 electronic valves, open the No. 1, No. 2 and No. 3 electronic valves, and rinse the syringe; S10, close the No. 2, No. 4, No. 5 and No. 6 electronic valves, open the No. 1, No. 3 and No. 7 electronic valves, start the vacuum pump to remove the transformer oil in the syringe and briefly evacuate; S11, close the No. 2, No. 3, No. 4, No. 5 and No. 7 electronic valves, open the No. 6 electronic valve, and start the oil drain pump to drain the transformer oil from the buffer bin; S12, repeat the above steps S9 and S10 once, push open the vacuum chamber cover plate where the rubber cap is placed, remove the syringe, seal the syringe, and then cover the vacuum chamber cover plate; S13, close the No. 1 electronic valve, remove the equipment oil pipe and the syringe oil pipe, and press the device oil drain button. Open the No. 2, No. 3, No. 4, No. 5, No. 6 and No. 7 electronic valves, start the oil drain pump to drain the residual oil from the pipeline and vacuum chamber and buffer chamber. After the oil is drained, restore the normal pressure and then close all valves. For the extraction of equipment without oil extraction valve, the specific steps are as follows: S14, close the No. 2 and No. 6 electronic valves, open the No. 3, No. 4 and No. 5 electronic valves, and start the vacuum pump to evacuate the pipeline and the sampling syringe; S15, close the No. 3 and No. 6 electronic valves, open the No. 2, No. 4 and No. 5 electronic valves, start the vacuum pump to remove the gas from the pipeline and rinse the pipeline; S16, close the No. 2, No. 3 and No. 6 electronic valves, open the No. 4 and No. 5 electronic valves, and start the vacuum pump to evacuate the pipeline; S17, close the No. 4 and No. 6 electronic valves, open the No. 2, No. 3 and No. 5 electronic valves, rinse the syringe and start the vacuum pump again to evacuate the vacuum chamber where the rubber cap is placed; S18, close the No. 2 and No. 6 electronic valves, open the No. 3, No. 4 and No. 5 electronic valves, start the vacuum pump to remove the transformer oil rinsed in the syringe, and evacuate the sampling syringe, the vacuum chamber where the rubber cap is placed, and part of the pipeline; S19, repeat steps S17 and S18 once; S20, close the No. 2, No. 3 and No. 5 electronic valves, open the No. 6 electronic valve, and start the oil drain pump to drain the waste oil from the buffer tank; S21, close the No. 4, No. 5 and No. 6 electronic valves, open the No. 2 and No. 3 electronic valves, use the pressure difference and the principle of the connecting vessel to complete the syringe oil extraction, and then close the No. 2 and No. 3 electronic valves; S22, close the No. 3 and No. 5 electronic valves, open the No. 2 and No. 4 electronic valves, at this time, the vacuum chamber where the rubber cap is placed and part of the pipeline are in a vacuum state, and the pressure difference fills this part with oil, close the No. 2 and No. 4 electronic valves, and light up the indicator light (then push open the vacuum chamber cover where the rubber cap is placed, remove the syringe, seal the syringe, and then cover the vacuum chamber cover; S23. Remove the oil pipe and the sampling syringe from the equipment, then press the oil drain button. The No. 2, No. 3, No. 4, No. 5, and No. 6 electronic valves will open, and the oil drain pump will be started to drain the residual oil from the pipeline, vacuum chamber, and buffer chamber. After the oil is drained and the pressure is restored to normal, close the No. 2, No. 3, No. 4, No. 5, and No. 6 electronic valves, and the end light will turn on.

8. A sealing oil extraction device for oil injection equipment according to claim 7, characterized in that: In step S1, the sampling syringe (5) is tilted downward by 60°.

9. A sealing oil extraction device for oil filling equipment according to claim 7, characterized in that: In the step S10, the sampling syringe (5) is tilted upward by 60°.

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