CN112051106A - A kind of sampling device of transformer bushing oil and sampling method thereof - Google Patents

Abstract

The invention relates to the technical field of transformer accessories, in particular to a sampling device for transformer bushing oil, comprising a sampling joint screwed on a sampling hole of the transformer bushing oil, an oil discharge pipe and a sampling bottle; the sampling joint comprises a screw joint, an outer hexagonal nut One end of the screw joint is connected to the outer hexagon nut and the oil discharge pipe joint in turn. The screw joint is provided with a through oil discharge hole and the oil discharge hole extends to the oil discharge pipe joint; the side of the sampling bottle close to the lower end is provided with an oil inlet pipe , There is a valve on the oil inlet pipe, and the oil inlet pipe is connected with the oil discharge pipe joint through the oil discharge pipe; the sampling bottle is provided with a piston matched with the sampling bottle, and the piston can move in the axial direction of the sampling bottle; the piston is vertically arranged with a Pull rod; the outer side of the top of the sampling bottle is provided with a buckle for clamping the pull rod, and the outer side wall of the sampling bottle is provided with a scale. The invention can carry out the fully airtight sampling of the transformer bushing oil, and can sample quantitatively.

Description

A kind of sampling device of transformer bushing oil and sampling method thereof

technical field

The invention relates to the technical field of transformer accessories, in particular to a sampling device for transformer bushing oil and a sampling method thereof.

Background technique

The main transformer (referred to as the main transformer) is the main operating equipment of the power plant, and the primary bushing is one of the important current-carrying components of the main transformer. The method used to detect the running state of the transformer bushing is not only to carry out high-voltage items such as dielectric loss and insulation during power failure, but also to regularly sample the insulating oil group in the bushing for chromatographic analysis, so as to timely and accurately reflect the running status of the equipment. The current oil-paper capacitor casing sampling hole structure adopts an internal check valve sealing method. In this structure, when taking oil samples, two staff members are required to cooperate to take oil samples. One uses a tool to open the check valve, and the other uses a funnel to The oil sample is connected to the outlet. This structure requires a lot of staff to take oil samples, and the operation takes a long time. As a result, external moisture can easily enter the inside of the casing, making the oil sample damp and affecting the safe operation of the equipment. Moreover, the oil sample is exposed to the air for a long time, reducing the The authenticity of oil samples and the accuracy of chromatographic analysis are not conducive to accurate diagnosis of equipment operation status. In addition, the existing sampling device cannot quantitatively sample the casing oil, resulting in waste of oil samples. Therefore, it is necessary to improve the existing transformer casing oil sampling device.

SUMMARY OF THE INVENTION

The purpose of the present invention is to address the above problems, to provide a sampling device for transformer bushing oil and a sampling method thereof, so that the sampling process can be sampled in a completely airtight state, so as to prevent external moisture from easily entering the inside of the casing, and quantitative sampling can reduce the waste of oil samples. , and can avoid the oil sample and air contact, improve the authenticity of the oil sample and the accuracy of chromatographic analysis.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows: a sampling device for transformer bushing oil, comprising a sampling joint, an oil discharge pipe and a sampling bottle screwed on the sampling hole of the transformer bushing oil; the sampling joint comprises a screw A joint, an outer hexagon nut and an oil discharge pipe joint. The screw joint has an external thread and is screwed to the sampling hole through the external thread. There is a through oil discharge hole inside and the oil discharge hole extends to the oil discharge pipe joint; the side of the sampling bottle close to the lower end is provided with an oil inlet pipe, the oil inlet pipe is provided with a valve, and the oil inlet pipe is connected with the oil discharge pipe through the oil discharge pipe. The oil discharge pipe joint is connected; the sampling bottle is provided with a piston matched with the sampling bottle, and the piston can move in the axial direction of the sampling bottle; a pull rod is vertically arranged on the piston, and one end of the pull rod is connected to the On the upper surface of the piston, the other end moves through the sampling bottle and extends out of the sampling bottle; the outer side of the top of the sampling bottle is provided with a buckle for clamping the pull rod, and the buckle is fixedly connected with the sampling bottle; the The outer side wall of the sampling bottle is provided with a scale extending along the axial direction of the sampling bottle.

Further, the valve includes a valve body, a movable sleeve, a spring and a sealing baffle, one end of the valve body is sleeved in the oil inlet pipe and connected to the oil inlet pipe, and the outer wall of the oil discharge pipe is connected to the oil inlet pipe. The inner wall of the other end of the valve body is screwed together; the valve body is provided with a first through hole penetrating through the valve body, the valve body is provided with a limit step at one end of the first through hole, and the first through hole is The movable sleeve is provided inside, the end of the first through hole away from the limit step and the movable sleeve leave a gap for the insertion of the oil discharge pipe, and one end of the movable sleeve protrudes from the limit step, One end of the movable sleeve protruding from the limit step is fixed with a sealing baffle, and the peripheral wall of the movable sleeve is evenly distributed with second through holes, and the other end of the movable sleeve is provided with a sliding protrusion near the end. The inner side of the valve body is provided with a chute that cooperates with the sliding boss; the outer sleeve of the movable sleeve is provided with a spring, one end of the spring is connected to the limit step, and the other end of the spring is connected to the the sliding boss connection.

Further, a tightening nut is provided on the outer casing of the screw joint and is located on a side close to the outer hexagonal nut, and the tightening nut has a threaded hole which is matched and screwed with the external thread of the screw joint.

Further, two sets of symmetrical guide rods are vertically arranged on the piston, and the two sets of guide rods are respectively arranged on both sides of the pull rod, one end of the guide rod is connected to the upper surface of the piston, and the other end of the guide rod is movable. Pass through the top wall of the sampling bottle and extend to the outside.

Further, it also includes an air extraction device, the air extraction device includes an airbag and an air extraction pipe, one end of the air extraction pipe is connected to the airbag, and the other end of the air extraction pipe is respectively connected to the sampling bottle and the air through a three-way pipe. A first stopcock valve is arranged on the connecting pipeline between the pipe and the sampling bottle, and a second stopcock valve is arranged on the connecting pipeline between the three-way pipe and the air.

Further, the oil discharge pipe joint is arranged in a cylindrical shape.

Further, the screw joint, the outer hexagonal nut and the oil discharge pipe joint are integrally formed.

Further, the buckle includes a first body and a second body, the inner side of the first body is provided with a first arc-shaped slot for matching and clamping with the pull rod, and the inner side of the second body is correspondingly provided with a matching card with the pull rod. The lower end of the first body is fixedly connected to the sampling bottle, one end of the second body is hinged with one end of the first body, and the other end of the second body is There are bolts, and one end of the first body corresponding to the bolt is provided with a bolt hole that is movably connected with the bolt.

Further, the scale is a volume scale.

A sampling method of a transformer bushing oil sampling device, comprising the following steps:

a. According to the scale on the sampling bottle, pull the rod to adjust the position of the piston and adjust the sampling volume. When the piston is adjusted to the position of the sampling volume, clamp the buckle to the rod to fix the position of the piston;

b. Exhaust the air in the sampling bottle through the air extraction device;

c. Slightly screw one end of the oil discharge pipe into the valve, the other end of the oil discharge pipe is connected to the sampling joint, and screw the outer hexagon nut on the sampling joint to make the screw joint screw into the casing sampling hole, and the screw joint gradually abuts against the sampling hole during the screwing process. Open the check valve and gradually apply thrust to open the check valve, so that the sampling joint and the sampling hole of the casing are sealed and connected, and then rotate the tightening nut to fasten the joint;

d. Further screw the oil discharge pipe into the valve, so that the valve of the oil inlet pipe is opened, and the oil inlet pipe and the oil discharge pipe are connected, so that the casing oil automatically enters the sampling bottle;

e. Unscrew the sampling joint, and the valve closes automatically when the oil discharge pipe is unscrewed to complete the sampling.

Owing to adopting the above-mentioned technical scheme, the present invention has the following beneficial effects:

(1) The transformer casing oil sampling device of the present invention is easy to install and disassemble, simple to operate, effective and reliable during sampling. One end of the sampling joint is provided with a screw joint, and its external thread can be matched with the internal thread of the oil taking hole, and the other end of the sampling joint is provided with a screw joint. The sampling bottle is connected through the oil discharge pipe to form a closed oil discharge circuit. During operation, the screw joint is gradually screwed into the check valve in the oil extraction hole of the top open casing, and the casing oil is directly discharged into the sampling bottle through the oil discharge hole and the oil discharge pipe. It solves the problems of narrow working surface, hidden dangers of high-altitude operation and long operation time when sampling the existing casing oil, shortens the time when oil is exposed to the air, and improves the authenticity of oil samples and the accuracy of chromatographic analysis, thereby To achieve safe, reliable and fast oil extraction; at the same time, a piston is set in the sampling bottle, and the piston is provided with a tie rod and a buckle for fixing the tie rod. The position of the piston can be adjusted by pulling the tie rod to adjust the sampling volume, and the position of the tie rod is fixed by the buckle to fix the sampling. volume, quantitative sampling, and reduce the waste of oil samples.

(2) In the present invention, the air in the sampling bottle can be extracted before sampling by setting the air extraction device communicated with the sampling bottle. First, a negative pressure is generated in the sampling bottle, which ensures that the liquid level in the transformer bushing oil is high regardless of whether it is high. It can effectively take samples at or below the state of the sampling bottle. Second, by extracting the air in the sampling bottle, the oil sample will not come into contact with the air, making the sampling sample pure, avoiding the interference and misleading of the air contamination of the sample, and improving the oil sample. Authenticity and accuracy of chromatographic analysis.

(3) The oil inlet of the sampling bottle is provided with a valve. The valve includes a valve body, a movable sleeve, a spring and a sealing stopper. The valve body is provided with a first through hole that penetrates through the valve body, and the movable sleeve is sleeved on the first through hole. One end of the through hole is slidably connected to the chute on the valve body through the sliding boss, the other end is connected to the sealing baffle and a second through hole is opened on the peripheral wall. The spring is sleeved outside the movable casing. In the middle, the oil discharge pipe pushes the sliding boss to move, the spring is compressed, and the movable sleeve drives the sealing baffle to move away from the valve body, so that the first through hole communicates with the oil inlet pipe through the second through hole, the valve opens, and then the oil discharge pipe is connected. And the oil inlet pipe; when the oil discharge pipe is unscrewed out of the valve, the spring stretches out, pushing the sliding boss to move outward, and the movable sleeve drives the sealing baffle to move toward the valve body, closing the valve. Therefore, the valve is unscrewed in the oil discharge pipe. Afterwards, the inlet of the oil inlet pipe can be automatically sealed to avoid oil leakage due to operations such as staff forgetting to close the valve.

Description of drawings

1 is a schematic structural diagram of a sampling device for transformer bushing oil according to the present invention;

Fig. 2 is the sectional structure schematic diagram of sampling joint in the present invention;

3 is a schematic structural diagram of a buckle in the present invention;

FIG. 4 is a schematic cross-sectional structure diagram of the valve in the present invention.

The reference numbers in the figure are: 11-screw joint, 12-external hexagon nut, 13-oil drain pipe joint, 14-oil drain hole, 15-fastening nut, 21-sampling bottle, 22-piston, 23-tie rod, 24-guide rod, 25-buckle, 251-first body, 252-second body, 253-first arc slot, 254-second arc slot, 255-bolt hole, 256-bolt, 26 - Oil inlet pipe, 27- Valve, 271- Valve body, 272- Chute, 273- Limit step, 274- Active sleeve, 275- Sliding boss, 276- Spring, 277- Second through hole, 278- Seal Baffle, 279-first through hole, 28-scale, 31-airbag, 32-exhaust pipe, 33-three-way pipe, 34-valve, 35-second plug valve, 4-oil drain pipe.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a co-existence of an intervening component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a co-existing centered component. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only.

As shown in Figures 1 and 2, a sampling device for transformer bushing oil includes a sampling joint screwed on the sampling hole of the transformer bushing oil, an oil discharge pipe 4 and a sampling bottle 21; the sampling joint includes a screw joint 11 , an outer hexagonal nut 12 and an oil discharge pipe joint 13, the screw joint 11 has an external thread and is screwed on the transformer casing oil sampling hole through the external thread, and the end of the screw joint 11 away from the sampling hole is sequentially connected to the outer hexagonal nut 12 , the oil discharge pipe joint 13, the screw joint 11, the outer hexagon nut 12 and the oil discharge pipe joint 13 are integrally formed, the screw joint 11 is provided with a through oil discharge hole 14 and the oil discharge hole 14 extends to the oil discharge pipe joint 13 The side of the sampling bottle 21 near the lower end is provided with an oil inlet pipe 26, the oil inlet pipe 26 is provided with a valve 27, and the oil inlet pipe 26 is connected with the oil discharge pipe joint 13 through the oil discharge pipe 4, preferably the oil discharge pipe The joint 13 is arranged in a cylindrical shape, which is convenient for connection with the oil discharge pipe 4 . The sampling bottle 21 is provided with a piston 22 matched with the sampling bottle 21, and the piston 22 can move in the axial direction of the sampling bottle 21; a pull rod 23 is vertically arranged on the piston 22, and one end of the pull rod 23 is connected On the upper surface of the piston 22, the other end moves through the sampling bottle 21 and extends out of the sampling bottle 21; the outer side of the top of the sampling bottle 21 is provided with a buckle 25 for clamping the pull rod 23, and the buckle 25 is connected with the The sampling bottle 21 is fixedly connected. When in use, pull the pull rod 23 to drive the piston 22 to move to adjust the sampling volume of the sampling bottle 21. When the sampling volume is fixed, the pull rod 23 is fixed by the buckle 25 to prevent the piston 22 from moving and ensure the accuracy of the sampling volume. The outer side wall of the sampling bottle 21 is provided with a scale 28 extending along the axial direction of the sampling bottle 21 . Preferably, the scale 28 is a volume scale, so that the volume can be directly read.

As shown in FIG. 4 , the valve 27 includes a valve body 271 , a movable sleeve 274 , a spring 276 and a sealing baffle 278 . One end of the valve body 271 is sleeved in the oil inlet pipe 26 and is connected with the oil inlet pipe 26 connection, the outer wall of the oil discharge pipe 4 is screwed with the inner wall of the other end of the valve body 271; the valve body 271 is provided with a first through hole 279 penetrating the valve body 271, and the valve body 271 is located on the valve body 271. One end of the first through hole 279 is provided with a limit step 273, the first through hole 279 is provided with the movable sleeve 274, and one end of the first through hole 279 away from the limit step 273 and the movable sleeve There is a gap for the oil discharge pipe 4 to be inserted between 274. One end of the movable sleeve 274 protrudes from the limit step 273, and one end of the movable sleeve 274 protrudes from the limit step 273. Second through holes 277 are evenly distributed on the peripheral wall of the movable sleeve 274 , the other end of the movable sleeve 271 is provided with a sliding boss 275 near the end, and the inside of the valve body 271 is provided with the sliding boss The movable sleeve 274 is provided with a spring 276 , one end of the spring 276 is connected to the limiting step 273 , and the other end of the spring 276 is connected to the sliding boss 275 . When in use, the oil discharge pipe 4 is screwed into the valve body 271, and gradually pushes the sliding boss 275 to move inward, thereby driving the movable sleeve 274 to move inward. The oil pipe 26 is communicated with the oil discharge pipe 4. When the oil discharge pipe 4 is unscrewed, the spring 276 stretches and pushes the sliding boss 275 to move outward, so that the movable sleeve 274 moves outward, and the sealing baffle 278 moves toward the direction close to the movable sleeve 274. Thereby, the inlet of the oil inlet pipe 26 is automatically sealed. The valve 27 can automatically seal the inlet of the oil inlet pipe 26 after the oil discharge pipe 4 is unscrewed, so as to avoid oil leakage due to operations such as staff forgetting to close the valve.

The screw joint 11 is provided with a tightening nut 15 on the side close to the outer hexagon nut 12 . The screw joint 11 is screwed through the threaded hole to enhance the tightness of the connection between the screw joint 11 and the oil outlet of the transformer bushing.

In order to further improve the stability of the movement of the piston, two sets of symmetrical guide rods 24 are vertically arranged on the piston 22 , and the two sets of guide rods 24 are respectively arranged on both sides of the pull rod 23 , and one end of the guide rod 24 is connected to the piston 22 The other end of the guide rod 24 moves through the top wall of the sampling bottle 21 and extends to the outside. The guide rod 24 has the function of guiding and balancing the force, so that the movement of the piston is more stable.

The sampling device for transformer bushing oil in this embodiment further includes an air extraction device, the air extraction device includes an airbag 31 and an air extraction pipe 32, one end of the air extraction pipe 32 is connected to the airbag 31, and the other end of the air extraction pipe 32 passes through a tee The pipes 33 are respectively communicated with the sampling bottle 21 and the outside air, a first stopcock 34 is provided on the connecting line between the three-way pipe 33 and the sampling bottle 21, and a second stopcock 34 is provided on the connecting line between the three-way pipe 33 and the outside air. Two-stop valve 35. When extracting steam, first close the first plug valve 34 and open the second plug valve 35, squeeze the air bag 31 to exhaust; then open the first plug valve 34 and close the second plug valve 35, release the air bag 31 to inhale, and pull out The air in the sampling bottle 21 is repeatedly operated until the air in the sampling bottle is exhausted. When the liquid level in the transformer bushing is higher than the sampling bottle 21, due to the action of gravity, the transformer bushing oil will automatically flow slowly into the sampling bottle 21 along the oil discharge pipe 4; when the liquid level in the transformer bushing is lower than the sampling bottle 21, the transformer The casing oil cannot flow out automatically. At this time, the air in the sampling bottle 21 is extracted by the steam extraction device to form a negative pressure inside, so that the transformer casing oil can automatically enter the sampling bottle 21 along the conduit, ensuring that the sampling process is not affected by the liquid in the casing. face impact. In addition, after the air in the sampling bottle 21 is drawn out, the oil sample entering the sampling bottle 21 will not come into contact with the air, so that the sampling sample is pure, and the air pollution of the sample is prevented from being disturbed and misleading, and the authenticity of the oil sample and the reliability of chromatographic analysis are further improved. Accuracy.

As shown in FIG. 3 , the buckle 25 includes a first body 251 and a second body 252 . The inner side of the first body 251 is provided with a first arc-shaped slot 253 matching the pull rod 23 . The inner side of the main body 252 is correspondingly provided with a first arc-shaped slot 254 which is matched with the pull rod 23. The lower end of the first main body 251 is fixedly connected to the sampling bottle 21, and one end of the second main body 252 is connected to the first One end of the main body 251 is hinged, the other end of the second main body 252 is provided with a bolt 256 , and the corresponding end of the first main body 251 is provided with a bolt hole 255 which is movably connected with the bolt 256 . Since the first body 251 is fixedly connected with the sampling bottle 21, when in use, only need to loosen the bolt 256 and then turn the second body 252, then the buckle 25 can be opened, and the piston 22 can be pulled. The two bodies 252 close the buckle 25, and screw the bolts 256 into the bolt holes 255 for fastening, so as to prevent the piston 22 from moving. Through the cooperation of the pull rod 23 and the buckle 25, the sampling volume can be quickly positioned, thereby improving the efficiency.

A sampling method of a transformer bushing oil sampling device, comprising the following steps:

a, according to the scale on the sampling bottle 21, pull the pull rod 23 to adjust the position of the piston 22, adjust the sampling volume, when the piston 22 is adjusted to the sampling volume position, the buckle 25 is clamped to the pull rod, and the position of the piston 22 is fixed;

b. The air in the sampling bottle 21 is discharged through the air extraction device;

c. Slightly screw one end of the oil discharge pipe 4 into the valve 27, the other end of the oil discharge pipe 4 is connected to the sampling joint, and screw the outer hexagon nut 12 on the sampling joint, so that the screw joint 11 is screwed into the casing sampling hole, and the screw joint 11 is screwed into the process. Gradually press against the check valve in the sampling hole and gradually apply thrust to open the check valve, so that the sampling joint is in sealing communication with the sampling hole of the casing, and then rotate the tightening nut 15 to fasten the joint;

d, further screw the oil discharge pipe 4 into the valve, so that the valve 27 of the oil inlet pipe 26 is opened, and the oil inlet pipe 26 is communicated with the oil discharge pipe 4, so that the casing oil automatically enters the sampling bottle 21;

e. Unscrew the sampling joint, and when the oil discharge pipe 4 is unscrewed, the valve 27 is automatically closed to complete the sampling.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Claims (10)

1. A sampling device for transformer bushing oil is characterized in that: comprising a sampling joint, an oil discharge pipe and a sampling bottle screwed on the sampling hole of the transformer bushing oil; the sampling joint comprises a screw joint, an outer hexagon nut and a row Oil pipe joint, the screw joint has an external thread and is screwed with the sampling hole through the external thread, the end of the screw joint away from the sampling hole is connected with the outer hexagon nut and the oil drain pipe joint in sequence, and the screw joint is provided with a through oil drain and the oil discharge hole extends to the oil discharge pipe joint; the side of the sampling bottle close to the lower end is provided with an oil inlet pipe, the oil inlet pipe is provided with a valve, and the oil inlet pipe is connected with the oil discharge pipe joint through the oil discharge pipe; The sampling bottle is provided with a piston matched with the sampling bottle, and the piston can move in the axial direction of the sampling bottle; a pull rod is vertically arranged on the piston, and one end of the pull rod is connected to the upper surface of the piston, and the other end It moves through the sampling bottle and extends out of the sampling bottle; the outer side of the top of the sampling bottle is provided with a buckle for clamping the pull rod, and the buckle is fixedly connected with the sampling bottle; the outer side wall of the sampling bottle is provided with a buckle A scale extending axially along the vial. 2. The sampling device for transformer bushing oil according to claim 1, wherein the valve comprises a valve body, a movable bushing, a spring and a sealing stopper, and one end of the valve body is sleeved on the The oil inlet pipe is inside and connected to the oil inlet pipe, the outer wall of the oil discharge pipe is screwed with the inner wall of the other end of the valve body; the valve body is provided with a first through hole penetrating the valve body, and the valve body is provided with a first through hole. There is a limit step at one end of the first through hole, the movable sleeve is arranged in the first through hole, and there is a gap between the end of the first through hole away from the limit step and the movable sleeve. There is a gap for the insertion of the oil discharge pipe, one end of the movable sleeve protrudes from the limit step, one end of the movable sleeve protruding from the limit step is fixed with a sealing baffle, and the peripheral wall of the movable sleeve is evenly distributed with Two through holes, the other end of the movable sleeve is provided with a sliding boss near the end, and the inner side of the valve body is provided with a sliding groove that cooperates with the sliding boss; the outer sleeve of the movable sleeve is provided with a spring , one end of the spring is connected with the limiting step, and the other end of the spring is connected with the sliding boss. 3. A sampling device for transformer bushing oil according to claim 1, characterized in that: the screw joint is provided with a tightening nut and is located on the side close to the outer hexagon nut, and the tightening nut has A threaded hole that is matched with the external thread of the screw joint. 4. A sampling device for transformer bushing oil as claimed in claim 1, characterized in that: two sets of symmetrical guide rods are vertically arranged on the piston, and the two sets of guide rods are respectively arranged on both sides of the tie rod, so that the One end of the guide rod is connected to the upper surface of the piston, and the other end of the guide rod moves through the top wall of the sampling bottle and extends to the outside. 5. A sampling device for transformer bushing oil according to claim 1, characterized in that: the sampling device further comprises an air extraction device, the air extraction device comprises an air bag and an air extraction pipe, and one end of the air extraction pipe is The airbag is connected, and the other end of the air extraction pipe is respectively connected to the sampling bottle and the air through a three-way pipe. A second stopcock is provided. 6 . The device for sampling transformer bushing oil according to claim 1 , wherein the oil discharge pipe joint is cylindrical. 7 . 7 . The sampling device for transformer bushing oil according to claim 1 , wherein the screw joint, the outer hexagonal nut and the oil discharge pipe joint are integrally formed. 8 . 8 . The sampling device for transformer bushing oil according to claim 1 , wherein the clip comprises a first body and a second body, and the inner side of the first body is provided with a matching and clamping device for the pull rod. 9 . a first arc-shaped slot, the inner side of the second body is correspondingly provided with a second arc-shaped slot that is matched with the pull rod, the lower end of the first body is fixedly connected with the sampling bottle, and one end of the second body is By being hinged with one end of the first body, the other end of the second body is provided with a bolt, and one end of the first body corresponding to the bolt is provided with a bolt hole that is movably connected with the bolt. 9 . The device for sampling transformer bushing oil according to claim 1 , wherein the scale is a volume scale. 10 . 10. A sampling method for a sampling device for transformer bushing oil as described in any one of claims 1-9, characterized in that: comprising the steps of: a. According to the scale on the sampling bottle, pull the rod to adjust the position of the piston and adjust the sampling volume. When the piston is adjusted to the position of the sampling volume, clamp the buckle to the rod to fix the position of the piston; b. Exhaust the air in the sampling bottle through the air extraction device; c. Slightly screw one end of the oil discharge pipe into the valve, the other end of the oil discharge pipe is connected to the sampling joint, and screw the outer hexagon nut on the sampling joint to make the screw joint screw into the casing sampling hole, and the screw joint gradually abuts against the sampling hole during the screwing process. Open the check valve and gradually apply thrust to open the check valve, so that the sampling joint and the sampling hole of the casing are sealed and connected, and then rotate the tightening nut to fasten the joint; d. Further screw the oil discharge pipe into the valve, so that the valve of the oil inlet pipe is opened, and the oil inlet pipe and the oil discharge pipe are connected, so that the casing oil automatically enters the sampling bottle; e. Unscrew the sampling joint, and the valve closes automatically when the oil discharge pipe is unscrewed to complete the sampling.

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