CN111766108A - Safe and efficient oil sample collection device - Google Patents
Safe and efficient oil sample collection device Download PDFInfo
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- CN111766108A CN111766108A CN202010625792.7A CN202010625792A CN111766108A CN 111766108 A CN111766108 A CN 111766108A CN 202010625792 A CN202010625792 A CN 202010625792A CN 111766108 A CN111766108 A CN 111766108A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The invention discloses a safe and efficient oil sample collecting device which comprises an oil extraction test tube, wherein the oil extraction test tube is connected with one end of a sampling tube, and the other end of the sampling tube is simultaneously connected with a first tee joint and an oil discharge pipeline through a first connecting device; a first pressure sensor with a local display function is arranged on the sampling tube; the other end of the first tee joint is connected with an oil taking pipeline, and the third end of the first tee joint is connected with an oil return main pipeline; the tail end of the oil discharge pipeline is connected with a piston cylinder, the piston cylinder is provided with an inlet and an outlet, and a second stop valve is installed in front of the inlet of the piston cylinder. The oil sample collection device has the functions and processes of oil circulation, residual oil utilization, oil sample collection and pipeline residual oil emptying. The invention can lead the oil sample to be in a closed state all the time in the collection process, and no gas can escape, thereby greatly reducing the probability of resampling test due to result deviation. The invention can also ensure that the latest oil sample is collected in real time, and the collected oil sample is not influenced by residual oil in the pipeline.
Description
Technical Field
The invention relates to the technical field of power equipment maintenance, in particular to an oil sample collecting device which is simple and efficient to operate and suitable for collecting oil samples of various power equipment.
Background
The power equipment oil is a main insulating medium for oil-immersed power equipment and is a medium for cooling the power equipment. The test of the electrical equipment oil not only can detect the property and the state of the oil, but also is an important means for monitoring whether the electrical equipment has faults or not.
When the inside of the power equipment breaks down, local abnormal overheating can be caused, oil and insulating materials can be heated and aged to decompose gas, the gas is dissolved in the oil, and the fault type can be judged by analyzing the gas composition and content in an oil sample.
The hydrogen is the gas generated at the earliest time when various faults occur, and the moisture content of the power equipment is high, while other components are not increased, so that the moisture content of the equipment can be roughly judged. The generation of acetylene is generally associated with discharge failure. If no other components are out of specification, but acetylene is out of specification and the growth rate is fast, it is likely that there is a high energy discharge fault inside the apparatus. In an overheating fault, when only the insulating oil at the heat source breaks down, the sum of both characteristic gases methane and ethylene may typically account for more than 80% of the total hydrocarbons, and as the temperature at the point of failure increases, the proportion of ethylene also increases. In any event, in the event of a discharge-type failure, carbon monoxide and carbon dioxide are produced in addition to the production of hydrogen hydrocarbon gas, as in the case of an overheat failure, with the interposition of solid insulation. But generally, the gas production rate for a thermal fault is slower than for a discharge fault. In practical situations, multiple faults often coexist, and comprehensive analysis is needed.
The requirements for analyzing and taking oil samples are high, and the first is that the oil samples cannot be taken in an open mode. Open sampling can cause gas in the oil sample to escape or gas in the air to dissolve, which can have a great impact on the accuracy of the test. When oil samples are taken at the station at present, or oil is discharged from a sampling valve at the bottom of the equipment and is filled into a wide-mouth container, and the wide-mouth container is tightly covered and sealed for inspection; this results in the escape of oil-like gas or the dissolution of air, which is a problem that the test result is biased and repeated sampling tests are required. And when the mode is adopted to take the oil sample, the oil is easy to drip around the sampling valve, the environment is polluted, and the cleaning condition of the station is influenced. Or devices and systems for sampling have been devised, but none of these devices and systems completely avoid the escape of oil-like gases or the dissolution of air gases.
Secondly, if draw forth rethread sample connection sample with fluid through the sample pipeline, generally need communicate through a very long section oil pipe between this moment power equipment's oil appearance sample valve and the power equipment body, and the oil appearance of this section oil pipe often can not truly reflect the oil appearance of power equipment body because the time of persisting in the pipeline is long. Residual oil left in the last sampling is remained in the pipeline, and a fresh oil sample cannot be timely collected, so that an analysis result is influenced.
Therefore, when an oil sample is taken, oil in the pipeline is usually required to be discharged so as to obtain a true oil sample of the body. The defects of the existing oil sampling are as follows: at present, oil sampling is usually performed in an oiling station by directly discharging polluted oil in the section of oil pipeline by using a plastic barrel, so that a lot of oil is easy to drip on site and the site environment is easy to damage.
Finally, safety concerns also need to be considered. For example, when the high-voltage shunt reactor of the current transformer substation takes oil, the oil needs to enter the sound-proof housing, light rays in the sound-proof housing are dim, noise is very high, the position of an oil taking port is very low, and a ladder stand and a pipeline are arranged beside the oil taking port, so that the oil taking work is very inconvenient.
In addition, in order to prevent the oil from flowing back after the oil pump, a check valve needs to be installed in the pipeline. The general check valve or the size structure is too large to be suitable for a small pipeline below DN 15; or the size is suitable, but the selection of spring is limited by the structure size and is lost efficacy easily, leads to the pipeline can't be sealed, can't play the effect of preventing fluid backward flow.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a safe high-efficient oil appearance collection system for solve the problem of oil appearance collection security that sample distortion, oil appearance leaked, power equipment oil wasted and oil appearance collection in-process.
The invention adopts the following technical scheme:
a safe and efficient oil sample collecting device comprises an oil extraction test tube, wherein the oil extraction test tube is connected with one end of a sampling tube, and the other end of the sampling tube is simultaneously connected with a first tee joint and an oil discharge pipeline through a first connecting device; a first pressure sensor with a local display function is arranged on the sampling tube; the other end of the first tee joint is connected with an oil taking pipeline, and the third end of the first tee joint is connected with an oil return main pipeline; the oil discharge pipeline tail end is connected with a piston cylinder, the piston cylinder is provided with an inlet and an outlet, and a second stop valve is installed in front of the piston cylinder inlet.
More specifically, the oil extraction test tube and the sampling tube are connected in a clamping sleeve type.
Further, the first connecting device is a first three-way valve, or a sixth stop valve connected in series with a third three-way valve.
Furthermore, the tail end of the main oil return pipeline is simultaneously connected with the first oil return branch and the second oil return branch through a second connecting device; and the tail ends of the first oil return branch and the second oil return branch are connected to an oil tank.
Furthermore, the second connecting device is a second tee joint, one end of the second tee joint is connected with a fourth stop valve in series, and the other end of the second tee joint is connected with another fifth stop valve in series; or a second three-way valve.
Furthermore, the piston cylinder is connected with a third stop valve through a pipeline, and a second pressure sensor with an in-situ display function is mounted on the pipeline connecting the outlet of the piston cylinder with the third stop valve; the third stop valve is connected with the waste oil collecting tank through a collecting pipe.
Further, an oil-gas separator is installed on the oil return branch II, and the oil-gas separator is provided with three ports: an inlet, a gas phase outlet and a liquid phase outlet.
Further, an inlet of the oil-gas separator is connected with the second connecting device, a liquid phase outlet is connected to the oil tank through a second oil return branch, and a gas phase outlet is connected with the needle valve through a pipeline; and the needle valve is connected with the waste gas collector through a pipeline.
Furthermore, a liquid level sensor with an on-site display function is installed on the oil-gas separator, and a third pressure sensor with an on-site display function is installed on a gas-phase outlet pipeline of the oil-gas separator.
Furthermore, the first tee joint is connected to an oil outlet of the oil tank through the oil taking pipeline, and the oil taking pipeline is sequentially connected with an oil pump, a first stop valve and a special check valve.
Furthermore, the special check valve comprises a valve cover, a valve body, a valve seat, a valve core, a sealing gasket, a bolt, a locking nut, a connecting rod, a rotating pin and a sealing ring; the connecting rod is connected with the valve body through a rotating pin, and the connecting rod is connected with the valve core through a bolt and locked through a locking nut.
Through the structural design, the oil sample collecting device has the functions of oil circulation, residual oil utilization, oil sample collection and pipeline residual oil emptying, can realize oil sample collection in a fully closed state, and solves the problems of sample distortion, oil sample leakage, oil waste of power equipment and oil sample collection safety in the oil sample collecting process.
The invention has the following beneficial effects:
1. the circulation passageway with waste oil, normal fluid parts, opens and close through the valve that sets up makes the fine separation of waste oil and normal fluid, avoids oil appearance to pollute. When the oil extraction test tube is disassembled and assembled, characteristic gas contained in oil liquid in the pipeline can escape, and air can also enter oil liquid in the sampling pipe and the sampling pipe, so that the accuracy of an oil sample is influenced, and the oil liquid is treated as waste oil; meanwhile, the waste oil and the normal oil are separated after the sampling tube is designed, so that the waste of the oil of the power equipment can be avoided to the maximum extent; and the waste oil can be well collected and treated.
2. The oil extraction test tube is in a negative pressure state by using the action of the piston cylinder, so that oil liquid can smoothly enter the oil extraction test tube during sampling; meanwhile, the negative pressure of the piston cylinder is utilized, so that when the oil extraction test tube is replaced, oil in the sampling tube flows back into the piston cylinder without leakage; and the oil is treated as waste oil, and further, the characteristic gas is prevented from escaping or air enters a pipeline.
3. Through oil circulation and residual oil emptying process, real latest oil samples of the power equipment body are guaranteed to be collected in real time, and the collected oil samples are not affected by residual oil in a pipeline, so that test data can better reflect data of the equipment body.
4. The oil sample is always in a closed state in the collection process, and no gas escapes, so that the probability of resampling test due to result deviation is greatly reduced.
5. Through the oil liquid circulation and the residual oil utilization process, the oil liquid is recycled, and the waste of the oil of the power equipment is avoided to the maximum extent.
6. The special check valve designed by the invention has the advantages of simple and compact structure, small size, light weight, small pressure loss, good sealing effect, difficult failure and leakage, simple connection, easy disassembly and reliable work.
7. The oil extraction test tube and the sampling tube are connected in a clamping sleeve type, the sealing performance is good, and the oil extraction test tube is very convenient to disassemble and replace.
8. The device can effectively protect the environment and keep the working environment clean; and the sampling is safe and convenient, the repeated sampling work is avoided, the working time is shortened, and the working efficiency is improved.
9. The oil sample collection device has wide applicability and is suitable for collecting oil samples in different power equipment.
Drawings
The invention is further described with reference to the following drawings.
Fig. 1 is a schematic structural diagram of an oil sample collection device according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of an oil sample collection device according to embodiment 2 of the present invention.
Fig. 3 is a schematic structural view of a check valve dedicated to the oil sampling device according to the embodiment of the present invention.
In the figure, 1-oil tank, 2-oil pump, 3-first stop valve, 4-special check valve, 5-oil taking main pipe, 6-first tee joint, 71-first tee joint, 8-sampling pipe, 9-oil extraction test tube, 10-oil discharge pipeline, 11-second stop valve, 12-piston cylinder, 13-third stop valve, 14-liquid collecting pipe, 15-waste oil collecting tank, 16-oil return main pipeline, 172-second tee joint, 173-fourth stop valve, 174-fifth stop valve, 18-oil return branch I, 19-oil return branch II, 20-oil-gas separator, 21-needle valve, 22-waste gas collector, 23-first pressure sensor, 24-second pressure sensor, 25-liquid level sensor, 26-a third pressure sensor, 711-a sixth stop valve, 712-a third tee joint, 171-a second tee joint, 41-a valve cover, 42-a valve body, 43-a valve seat, 44-a valve core, 45-a sealing gasket, 46-a bolt, 47-a locking nut, 48-a connecting rod, 49-a rotating pin and 410-a sealing ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.
The first embodiment is as follows:
as shown in fig. 1 and 3, a safe and efficient oil sample collection device comprises an oil extraction test tube 9, wherein the oil extraction test tube 9 is connected with one end of a sampling tube 8, and the other end of the sampling tube 8 is simultaneously connected with a first tee joint 6 and an oil discharge pipeline 10 through a first connection device; a first pressure sensor 23 with an on-site display is arranged on the sampling tube 8; the other end of the first tee joint 6 is connected with the oil taking pipeline 5, and the third end of the first tee joint is connected with the oil return main pipeline 16; the tail end of the oil drainage pipeline 10 is connected with a piston cylinder 12, the piston cylinder 12 is provided with an inlet and an outlet, and a second stop valve 11 is arranged in front of the inlet of the piston cylinder 12.
More specifically, in the first embodiment, the first connection device is a first three-way valve 71. The first three-way valve 71 has three ports: the port A, the port B and the port C are communicated; when the port A is closed, the port C is opened, and the port B is communicated with the port C.
The A port of the first three-way valve 71 is connected with one end of the first three-way valve 6, the B port is connected with the oil extraction test tube 9 through the sampling tube 8, and the C port is connected with the oil drainage pipeline 10.
A first pressure sensor 23 is mounted on the sampling tube 8 for monitoring the pressure in the production tubing. Because the oil recovery test tube is the plastics material, and the bearing capacity has certain restriction, consequently in the sampling process, the back is opened to three-way valve 71's A mouth, need carefully observe pressure sensor 23's pressure value and show, should in time close three-way valve 71's A mouth when the pressure value surpasses the early warning value, avoids the oil recovery test tube to break, and oil appearance reveals in the pipeline.
The oil extraction test tube 9 and the sampling tube 8 are connected in a clamping sleeve type, the sealing performance is good, and the oil extraction test tube is convenient to disassemble and replace.
When the oil sample is collected and completed, the oil extraction test tube 9 is disassembled and assembled, gas contained in oil liquid in the sampling tube 8 can escape, air also can enter the oil liquid retained in the sampling tube 8 and the pipeline, and therefore the accuracy of the oil sample is affected, and the oil liquid is treated as waste oil. In order to separate the waste oil from the normal oil well, a valve which can be opened and closed needs to be arranged between the sampling pipe 8 and the oil taking pipeline 5, a pipeline for discharging the waste oil needs to be arranged for discharging the waste oil, and a valve which can be opened and closed also needs to be arranged between the pipeline for discharging the waste oil and the oil taking pipeline 5.
The selection sets up first three-way valve 71 at the intersection of getting oil pipe way 5, oil extraction pipeline 10, sampling tube 8, and the circulation passageway with waste oil, normal fluid that just can be fine is separately, simultaneously because A mouth, the C mouth of first three-way valve 71 can not open simultaneously, consequently realize can be with the fine separation of waste oil and normal fluid, the maloperation can not appear moreover. When gathering oil appearance, the C mouth of first three-way valve 71 is closed, and A mouth is opened, and A mouth and B mouth intercommunication get oil pipe 5 and sampling tube 8 intercommunication, and normal fluid can flow to in the oil recovery test tube 9 in the pipeline at this moment.
When the oil sample collection is completed, the waste oil in the sampling pipe 8 needs to be discharged in time, and at the moment, the port A of the first three-way valve 71 is closed, so that the normal oil in the oil taking pipeline 5 can be separated from the waste oil in the sampling pipe 8; when the port a of the first three-way valve 71 is closed, the port C is opened, the port B is communicated with the port C, at this time, the sampling tube 8 is communicated with the oil discharge pipeline 10, and the flow passage for discharging the waste oil is communicated.
The second stop valve 11 has a liquid inlet end and a liquid outlet end, the liquid inlet end of the second stop valve 11 is connected with the oil drainage pipeline 10, and the liquid outlet end is connected with the inlet of the piston cylinder 12.
The third stop valve 13 is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end of the third stop valve 13 is connected with an outlet of the piston cylinder 12 through a pipeline, and a second pressure sensor 24 with an on-site display is arranged on the connected pipeline; the liquid outlet end of the third stop valve 13 is connected with a liquid collecting pipe 14, and the liquid collecting pipe 14 is connected with a waste oil collecting tank 15.
After the oil sample is collected, when the oil extraction test tube 9 is taken down, in order to prevent the residual oil in the sampling tube 8 from leaking, the residual oil in the sampling tube 8 is tried to flow along the oil drainage pipeline 10; meanwhile, when collecting the oil sample, in order to make the oil sample smoothly enter the oil extraction test tube 9, a relative vacuum should be formed in the oil extraction test tube 9. The piston cylinder 12 serves just these two functions.
A new empty oil extraction test tube 9, before the next round of oil sample collection is started, the port A of the first three-way valve 71 is closed, and the port C is opened; then the second stop valve 11 is opened and the third stop valve 13 is closed; the piston rod of the piston cylinder 12 is pulled outwards, so that relative vacuum is formed in the piston cylinder 12, and air in the oil extraction test tube 9 and waste oil-gas mixture in the sampling tube 8 flow into the piston cylinder 12 under the action of pressure difference. At this time, the second stop valve 11 is closed, the third stop valve 13 is kept closed, the piston rod of the piston cylinder 12 is pushed inwards to squeeze the oil-gas mixture in the piston cylinder 12, and when the piston rod moves to the limit position or reaches the set pressure value, the third stop valve 13 is opened, and the oil-gas mixture in the piston cylinder 12 is discharged through the liquid collecting pipe 14. The second pressure sensor 24 is used to monitor the pressure in the piston cylinder 12.
Keeping the opening of the first three-way valve 71A closed and the opening of the opening C unchanged; the operation is repeated for several times, so that relative vacuum can be formed in the oil extraction test tube 9 and the sampling tube 8, at the moment, the oil sample collection can be started only by opening the port A of the first three-way valve 71 and then closing the port C.
When the oil sample is collected and the oil extraction test tube needs to be replaced, the second stop valve 11 is opened, the third stop valve 13 is closed, and then the piston rod of the piston cylinder 12 is pulled outwards, so that relative vacuum is formed in the piston cylinder 12; at this time, the port a of the first three-way valve 71 is closed, and the port C is opened, and the production test tube 9 from which the sampling is completed can be removed. At this time, the negative pressure in the piston cylinder 12 makes the oil in the sampling tube flow back into the piston cylinder 12 under the negative pressure without leakage when the oil extraction test tube 9 is replaced.
The tail end of the main oil return pipeline 16 is simultaneously connected with the first oil return branch 18 and the second oil return branch 19 through a second connecting device.
More specifically, in the first embodiment, the second connection device is a second tee joint 172, one end of the second tee joint 172 is connected to the main oil return pipeline 16, the other end of the second tee joint is connected in series to a fourth stop valve 173, and the other end of the second tee joint is connected in series to a fifth stop valve 174.
The fourth stop valve 173 and the fifth stop valve 174 respectively have a liquid inlet end and a liquid outlet end, the liquid inlet end of the fourth stop valve 173 is connected with one end of the second tee 172, and the liquid outlet end is connected with the first oil return branch 18; the liquid inlet end of the fifth stop valve 174 is connected with the third end of the second tee joint 172, and the liquid outlet end is connected with the second oil return branch 19.
The oil tank 1 is provided with an oil outlet and an oil return port. The tail ends of the first oil return branch 18 and the second oil return branch 19 are connected to an oil return opening of the oil tank 1.
One end of the first tee joint 6 is connected to an oil outlet of the oil tank 1 through an oil taking pipeline 5, and the oil taking pipeline 5 is sequentially connected with an oil pump 2, a first stop valve 3 and a special check valve 4.
The oil pump 2 is provided with an inlet and an outlet, and the oil outlet of the oil tank 1 is connected with the inlet of the oil pump 2; the first stop valve 3 has a liquid inlet end and a liquid outlet end, and the special check valve 4 has a liquid inlet end and a liquid outlet end; the liquid inlet end of the first stop valve 3 is connected with the outlet of the oil pump 2, and the liquid outlet end is connected with the liquid inlet end of the special check valve 4; the liquid outlet end of the special check valve 4 is connected with one end of a first tee joint 6.
Before the collection oil appearance, for the authenticity and the validity of guaranteeing the oil appearance, should all update the fluid of reserving in getting oil pipe 5 and replace with the latest fluid of power equipment and take a sample. The oil in the oil tank 1 is the latest oil taken from the electric equipment.
At this time, the port a of the first three-way valve 71 is closed, the fourth stop valve 173 is opened, and the fifth stop valve 174 is closed, so that the oil tank 1, the sampling pipeline 5, and the first oil return branch 18 form a closed loop, and the latest oil circularly flows in the oil tank 1, the sampling pipeline 5, and the first oil return branch 18 through pressurization of the oil pump 2 until all the remaining oil in the sampling pipeline 5 and the first oil return branch 18 is replaced by the latest oil in the power equipment.
The special check valve is specially designed for a small-bore oil taking pipeline and comprises a valve cover 41, a valve body 42, a valve seat 43, a valve core 44, a sealing gasket 45, a bolt 46, a locking nut 47, a connecting rod 48, a rotating pin 49 and a sealing ring 410; the connecting rod 48 is connected with the valve body 42 through a rotating pin 49, and the connecting rod 48 is connected with the valve core 44 through a bolt 46 and locked through a locking nut 47.
When the pressure at the liquid inlet end of the special check valve 4 is greater than the pressure at the liquid outlet end, the pressure acting on the valve core 44 makes the valve core 44 leave the valve seat 43, the connecting rod 48 is driven to rotate by the bolt 46, and when the valve core 44 leaves the valve seat 43, the flow passage from the liquid inlet end to the liquid outlet end is conducted, and the valve is opened; when the pressure at the liquid inlet end of the special check valve 4 is smaller than the pressure at the liquid outlet end, the pressure acting on the valve core 44 causes the valve core 44 to press the valve seat 43, and a flow passage from the liquid inlet end to the liquid outlet end is blocked, so that the medium can only flow in a single direction from the liquid inlet end to the liquid outlet end; in addition, the liquid inlet end and the liquid outlet end of the special check valve are connected with the oil taking pipeline by adopting inner tapered threads, the sealing performance is good, and the connection and the disassembly are simple.
An oil-gas separator 20 is mounted on the oil return branch II 19, and the oil-gas separator 20 is provided with three ports: an inlet, a gas phase outlet and a liquid phase outlet.
An inlet of the oil-gas separator 20 is connected with a liquid outlet end of the fifth stop valve 174 through a section of pipeline of the oil return branch II 19, a liquid phase outlet is connected to an oil return port of the oil tank 1 through another section of pipeline of the oil return branch II 19, and a gas phase outlet is connected with the needle valve 21; the needle valve 21 is connected to an exhaust collector 22 via a line.
The fourth cut-off valve 173 is closed, and the fifth cut-off valve 174 is opened; then the first stop valve 3 is opened; the oil pump 2 is started. Under the pressurization effect of the oil pump 2, the oil liquid retained in the oil taking pipeline 5 flows into the oil-gas separator 20; the oil and heavy gas is light, and the oil-gas mixture with various gases is separated in the oil-gas separator 20; the purified oil liquid flows back to the oil tank from the liquid phase outlet of the oil-gas separator 20, and the exhaust gas enters the exhaust gas collector 22 through the gas phase outlet pipeline via the needle valve 21.
A liquid level sensor 25 with an on-site display is arranged on the oil-gas separator 20, and a third pressure sensor 26 with an on-site display is arranged on a gas phase outlet pipeline of the oil-gas separator 20. The level sensor 25 is used to monitor the oil level in the gas-oil separator 20, and the third pressure sensor 26 is used to monitor the pressure in the gas-oil separator 20.
Through the design, the oil sample collecting device has the flow functions of oil circulation, residual oil utilization, oil sample collection and pipeline residual oil emptying, realizes oil sample taking in a fully closed state, and solves the problems of sample distortion, oil sample leakage, oil waste of power equipment and oil sample collection safety in the oil sample collecting process.
The flow and the function are realized as follows:
1. oil liquid circulation process
Before sampling, in order to ensure that a fresh oil sample is collected, firstly, an oil liquid circulation flow is started, and the steps are as follows:
(1) the first three-way valve 71A port is closed;
(2) the fourth cut-off valve 173 is opened;
(3) closing the fifth stop valve 174;
(4) then the first stop valve 3 is opened;
(5) starting the oil pump 2;
under the action of the oil pump 2, oil circularly flows in front of the oil tank 1 and the first three-way valve 71 through the oil taking pipeline 5 and the oil return branch I (18). After the oil liquid circulates for a period of time, at this time, the oil liquid in the oil taking pipeline 5 becomes a real-time oil sample of the power equipment body.
2. Oil sample collection process
The oil sample collection steps are as follows:
(1) the oil pump 2 is kept running, so that the oil circulating in the pipeline is in a pressurized state;
(2) opening the second stop valve 11;
(3) closing the third stop valve 13;
(4) a piston rod of the piston cylinder 12 is pulled outwards to form negative pressure in the piston cylinder 12, so that residual oil in the sampling tube 8 flows into the piston cylinder 12, and meanwhile, negative pressure is formed in the oil extraction test tube 9;
when negative pressure is formed inside the sampling test tube 9, sampling can be started:
(5) opening the port A of the first three-way valve 71, closing the port C of the first three-way valve 71 at the same time, and communicating the port A of the first three-way valve 71 with the port B at the moment;
at the moment, the oil is pressurized by the oil pump 2, and the oil in the oil taking pipeline 5 flows through the first three-way valve 71 and the sampling pipe 8 under the action of pressure and enters the oil extraction test tube 9;
(6) because the oil extraction test tube 9 is made of plastic materials, the pressure bearing capacity is limited to a certain extent, in the sampling process, after the opening A of the first three-way valve 71 is opened, the pressure value display of the pressure sensor 23 arranged on the sampling tube 8 needs to be observed carefully, and when the pressure value exceeds the early warning value, the opening A of the first three-way valve 71 needs to be closed in time, so that the oil extraction test tube 9 is prevented from being broken, and the oil sample in the pipeline is prevented from leaking;
(7) when the oil recovery test tube 9 is full of oil, the first three-way valve 71A is closed;
(8) the oil pump 2 is turned off;
(9) taking down the oil extraction test tube 9 and replacing with a new oil extraction test tube;
at the moment, the port A of the first three-way valve 71 is closed, the port C is opened, the port B is communicated with the port C, the second stop valve 11 is also in an open state, and the piston cylinder 12 is still in a negative pressure state, so that residual oil in the sampling tube 8 flows into the piston cylinder 12 under the action of negative pressure, the residual oil cannot leak out when the oil extraction test tube 9 is replaced, and the pollution to the ground and the working clothes of workers is avoided;
(10) and (4) closing the first stop valve 3 after the oil pump 2 is closed for three minutes, and finishing the collection of the oil sample.
3. Pipeline residual oil emptying process
After the oil sample is collected, the process enters a pipeline residual oil emptying process, and the process comprises the following steps:
(1) closing the second stop valve 11;
at this time, the third cut-off valve 13 remains closed;
(2) a piston rod of the piston cylinder 12 is pushed inwards to compress the mixed oil gas in the piston cylinder 12;
(3) and observing a pressure sensor 24 on an outlet pipeline of the piston cylinder 12, when the pressure value displayed by the pressure sensor 24 reaches a set value,
(4) opening the third stop valve 13;
at the moment, the mixed oil gas in the piston cylinder 12 flows into a waste oil collecting tank 15 through a collecting pipe 14 under the action of pressure;
(5) and after the mixed oil gas in the piston cylinder 12 is completely discharged, closing the third stop valve 13, and ending the process.
When the 15 fluid collections of waste oil collection liquid case are full, can carry out centralized processing to waste oil, reduce work load, avoided environmental pollution simultaneously.
4. Residual oil utilization process
In order to avoid that oil in the oil taking pipeline 5 remains for a long time, an oil sample of an electric power equipment body cannot be truly reflected, or after equipment maintenance is finished, residual oil remained when equipment fails last time remains in the pipeline, a fresh oil sample cannot be timely acquired, an analysis result is influenced, the oil in the oil taking pipeline 5 needs to be regularly updated, and the flow is specially set for utilizing the oil of the electric power equipment to the maximum extent without causing waste. The process comprises the following steps:
(1) the fourth cut-off valve 173 is closed;
(2) opening the fifth stop valve 174;
(4) then the first stop valve 3 is opened;
(5) starting the oil pump 2;
under the pressurization effect of the oil pump 2, the oil liquid retained in the oil taking pipeline 5 flows into the oil-gas separator 20; the oil and heavy gas is light, and the oil-gas mixture with various gases is separated in the oil-gas separator 20; the purified oil liquid flows back to the oil tank from the liquid phase outlet of the oil-gas separator 20, and the exhaust gas enters the exhaust gas collector 22 through the gas phase outlet pipeline via the needle valve 21.
(6) After the oil pump operates for 5-10 minutes, the oil liquid retained in the oil taking pipeline 5 is replaced, and the pump can be stopped.
Example two:
as shown in fig. 2 and 3, a safe and efficient oil sample collection device comprises an oil extraction test tube 9, wherein the oil extraction test tube 9 is connected with one end of a sampling tube 8, and the other end of the sampling tube 8 is simultaneously connected with a first tee joint 6 and an oil discharge pipeline 10 through a first connection device; a first pressure sensor 23 with an on-site display is arranged on the sampling tube 8; the other end of the first tee joint 6 is connected with the oil taking pipeline 5, and the third end of the first tee joint is connected with the oil return main pipeline 16; the tail end of the oil drainage pipeline 10 is connected with a piston cylinder 12, the piston cylinder 12 is provided with an inlet and an outlet, and a second stop valve 11 is arranged in front of the inlet of the piston cylinder 12.
The second stop valve 11 has a liquid inlet end and a liquid outlet end, the liquid inlet end of the second stop valve 11 is connected with the oil drainage pipeline 10, and the liquid outlet end is connected with the inlet of the piston cylinder 12.
The tail end of the main oil return pipeline 16 is simultaneously connected with the first oil return branch 18 and the second oil return branch 19 through a second connecting device. The oil tank 1 is provided with an oil outlet and an oil return port. The tail ends of the first oil return branch 18 and the second oil return branch 19 are connected to an oil return opening of the oil tank 1.
The second embodiment is different from the first embodiment in that the first connecting device and the second connecting device are different.
In the second embodiment, the first connection device is specifically a sixth stop valve 711, and is connected in series with a third tee 712.
The sixth stop valve 711 has an inlet end and an outlet end, the inlet end of the sixth stop valve 711 is connected with one end of the first tee joint 6, the outlet end is connected with one end of the third tee joint 712, the other end of the third tee joint 712 is connected with the sampling tube 8, and the third end is connected with the oil discharge pipeline 10.
In the second embodiment, the first connecting device is specifically the second three-way valve 171. The second three-way valve 171 is provided with three ports: the port A, the port B and the port C are communicated; when the port B is closed, the port C is opened, and the port A is communicated with the port C.
The port A of the second three-way valve 171 is connected with one end of the first three-way valve 6, the port C is connected with the first oil return branch 18, and the port B is connected with the inlet of the oil-gas separator 20 through a section of pipeline of the second oil return branch 19.
The rest parts and the structure of the second embodiment are the same as the first embodiment.
When the oil circulation flow is operated, the port B of the second three-way valve 171 is closed, the port C is opened, and the port A is communicated with the port C; while the sixth stop valve 711 is closed; under the action of the oil pump 2, the oil circularly flows in front of the oil tank 1 and the sixth stop valve 711 through the oil taking pipeline 5 and the oil return branch I18.
When the oil sample collection process is operated, the port B of the second three-way valve 171 is kept closed, the port C is opened, the port A is communicated with the port C, and the sixth stop valve 711 is closed; the second stop valve 11 is opened, and the third stop valve 13 is closed; a piston rod of the piston cylinder 12 is pulled outwards to form negative pressure in the oil extraction test tube 9; the sixth stop valve 711 is then opened so that the pressure oil enters the production test tube 9. After sampling, the sixth stop valve 711 is closed; when the oil recovery test tube 9 is replaced, the second stop valve 11 is opened, and the third stop valve 13 is kept closed.
When the pipeline residual oil emptying process is operated, the third stop valve 13 is kept closed, and the second stop valve 11 is closed; the piston rod of the piston cylinder 12 is pushed inwards to pressurize the oil-gas mixture in the piston cylinder 12, when the pressure reaches a preset value, the third stop valve 13 is opened, the oil-gas mixture in the piston cylinder 12 is discharged under the action of the pressure, and after the oil-gas mixture is discharged, the third stop valve 13 is closed.
When the residual oil utilization process is operated, the sixth stop valve 711 is kept closed, the port B of the second three-way valve 171 is opened, the port C is closed at the moment, and the port A of the second three-way valve 171 is communicated with the port B; the first stop valve 3 is opened, and the oil pump 2 is started, so that the process can be operated.
The above-described embodiments are merely preferred examples of the present invention, and are not exhaustive of the possible implementations of the present invention. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. Any modification, equivalent replacement, equivalent change, improvement or the like made in accordance with the spirit and principle of the present invention should be considered to be included in the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a safe high-efficient oil appearance collection system which characterized in that: the device comprises an oil extraction test tube (9), wherein the oil extraction test tube (9) is connected with one end of a sampling tube (8), and the other end of the sampling tube (8) is simultaneously connected with a first tee joint (6) and an oil drainage pipeline (10) through a first connecting device; a first pressure sensor (23) with a local display function is arranged on the sampling tube (8); the other end of the first tee joint (6) is connected with the oil taking pipeline (5), and the third end of the first tee joint is connected with the oil return main pipeline (16); the tail end of the oil drainage pipeline (10) is connected with a piston cylinder (12), the piston cylinder (12) is provided with an inlet and an outlet, and a second stop valve (11) is installed in front of the inlet of the piston cylinder (12).
2. The safe and efficient oil sample collection device according to claim 1, characterized in that: the tail end of the oil return main pipeline (16) is simultaneously connected with the first oil return branch (18) and the second oil return branch (19) through a second connecting device; the tail ends of the first oil return branch (18) and the second oil return branch (19) are connected to the oil tank (1).
3. The safe and efficient oil sample collection device according to claim 1, characterized in that: the first connecting device is a first three-way valve (71), or a sixth stop valve (711) connected with a third three-way valve (712) in series.
4. A safe and efficient oil sample collection device according to claim 2, characterized in that: the second connecting device is a second tee joint (172), one end of the second tee joint (172) is connected with a fourth stop valve (173) in series, and the other end of the second tee joint (172) is connected with a fifth stop valve (174) in series; or a second three-way valve (171).
5. The safe and efficient oil sample collection device according to claim 1, characterized in that: an outlet of the piston cylinder (12) is connected with a third stop valve (13) through a pipeline, and a second pressure sensor (24) with a local display function is installed on the outlet of the piston cylinder (12); the third stop valve (13) is connected with a waste oil collecting tank (15) through a collecting pipe (14).
6. A safe and efficient oil sample collection device according to claim 2, characterized in that: an oil-gas separator (20) is installed on the oil return branch II (19), and the oil-gas separator (20) is provided with three ports: an inlet, a gas phase outlet and a liquid phase outlet.
7. A safe and efficient oil sample collection device according to claim 6, characterized in that: the inlet of the oil-gas separator (20) is connected with the second connecting device, the liquid phase outlet is connected to the oil tank (1) through a second oil return branch (19), and the gas phase outlet is connected with the needle valve (21) through a pipeline; the needle valve (21) is connected with an exhaust gas collector (22) through a pipeline.
8. The safe and efficient oil sample collection device according to claim 1, characterized in that: the first tee joint (6) is connected to an oil outlet of the oil tank (1) through the oil taking pipeline (5), and the oil taking pipeline (5) is sequentially connected with an oil pump (2), a first stop valve (3) and a special check valve (4).
9. A safe and efficient oil sample collection device according to claim 8, characterized in that: the special check valve (4) comprises a valve cover (41), a valve body (42), a valve seat (43), a valve core (44), a sealing gasket (45), a bolt (46), a locking nut (47), a connecting rod (48), a rotating pin (49) and a sealing ring (410); the valve cover (41) is detachably connected with the valve body (42); sealing grooves are formed in the valve cover (41) and the valve body (42), and the sealing ring (410) is embedded in the sealing grooves; the valve body (42) and the valve seat (43) are integrally cast; the connecting rod (48) is hinged with the valve body (42) through the rotating pin (49); and a second sealing groove is formed in the valve core (44), the sealing gasket (45) is embedded in the second sealing groove, and the valve core (44) is connected with the connecting rod (48) through a bolt (46) and locked through a locking nut (47).
10. A safe and efficient oil sample collection device according to claim 7, characterized in that: the oil-gas separator (20) is provided with a liquid level sensor (25) with an in-situ display function, and a gas phase outlet of the oil-gas separator (20) is provided with a third pressure sensor (26) with an in-situ display function.
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| CN202010625792.7A CN111766108A (en) | 2020-07-02 | 2020-07-02 | Safe and efficient oil sample collection device |
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| CN202010625792.7A CN111766108A (en) | 2020-07-02 | 2020-07-02 | Safe and efficient oil sample collection device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113267378A (en) * | 2021-05-25 | 2021-08-17 | 国网河北省电力有限公司检修分公司 | Get oily device and get oily system |
| CN113281427A (en) * | 2021-04-19 | 2021-08-20 | 常州市佳华电子有限公司 | Main transformer oil chromatogram on-line monitoring system |
| CN113299464A (en) * | 2021-05-21 | 2021-08-24 | 广东电网有限责任公司 | Adjustable reflux unit of fluid is got to on-load conservator |
| CN118130168A (en) * | 2024-05-07 | 2024-06-04 | 杭州申昊科技股份有限公司 | Charged state oil sample safety automatic acquisition device and method thereof |
| CN118130167A (en) * | 2024-05-07 | 2024-06-04 | 杭州申昊科技股份有限公司 | Oil sample collection robot and oil extraction method thereof |
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