Downward leading type insulating oil sampling device

Abstract

The invention relates to the technical field of substation operation and maintenance equipment, in particular to a leading-down type insulating oil sampling device which comprises a connector, a sampling assembly and a leading-out pipe. The connector is fixedly installed at the left end of the leading-out pipe, and a vent hole communicated with the inside and the outside is formed in the outer side of the upper portion of the connector; the right end of the outlet pipe is bent downwards and then fixedly provided with a sampling assembly, the sampling assembly comprises a valve body, a valve rod, a valve element, a sampling shell and a switch ejector pin, and the upper end of the valve body is provided with a vertically-through central channel. The sampling device is reasonable and compact in structure, when the sampling device is used, the left end of the connector and a sampling opening of an insulating sleeve are installed together, the left end of the connector and the sampling opening of the insulating sleeve are detachably and fixedly installed together through an existing well-known movable pipe connector, and therefore the disassembly and assembly difficulty between the connector and the sampling opening can be reduced; the gas discharging plug can be opened in the sampling process, and gas brought in in the installation process is discharged, so that pollution of the gas to insulating oil is eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of substation operation and maintenance equipment, and is a down-lead type insulating oil sampling device. Background Art

[0002] An insulating bushing is a device that leads the high- and low-voltage leads inside a transformer or reactor out of the oil tank, and is responsible for supporting and fixing the leads and insulating the leads from the equipment shell and the ground. It is mostly used in transformers and high-voltage reactors of 35 kV and above. The inside of it is filled with treated transformer oil, making the internal main insulation a paper-oil structure to meet the requirements for insulation performance. If there are defects or faults in the bushing, it will pose a serious threat to the safe and stable operation of the transformer / high-voltage reactor.

[0003] The existing single hydrogen sensor, oil pressure sensor and sampling valve are integrally installed at the bottom interface of the insulating bushing to monitor the hydrogen content and oil-gas pressure of the transformer oil inside the insulating bushing. Since the insulating oil inside the insulating bushing is in a static state all year round during operation, when characteristic gases are generated in the fault area, the characteristic gases can only spread in the insulating oil by diffusion, and the propagation efficiency is low. Moreover, the detection range of the sensor is limited to a small area where the lower probe is located. Therefore, there is a problem of a very long time difference from the occurrence of the fault to the actual detection of the characteristic gases by the sensor, and the content of the characteristic gases measured by the sensor is quite different from the actual value of the insulating oil in the bushing, which is not conducive to judgment. On the other hand, the existing oil sampling port is located at the bottom of the bushing. When the equipment is in operation, the safety distance from the oil sampling position to the upper running high-voltage lead is insufficient. The operator can only take the bushing oil sample for analysis when the equipment stops running, and the operation position is above the transformer (high-voltage reactor) body, which is a high-altitude operation, and the conditions for taking the oil sample are harsh. Summary of the Invention

[0004] The present invention provides a down-lead type insulating oil sampling device, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem of great difficulty in insulating oil sampling operation due to insufficient safety distance from the oil sampling position to the upper running high-voltage lead when the equipment is in operation.

[0005] The technical solution of the present invention is achieved by the following measures: A down-lead type insulating oil sampling device includes a connector, a sampling assembly, and an outlet pipe. The left end of the outlet pipe is fixedly installed with a connector. An air vent that is internally and externally connected is provided on the outer side of the upper part of the connector. An air release plug is installed in the air vent. The right end of the outlet pipe is bent downward and then fixedly installed with a sampling assembly. The sampling assembly includes a valve body, a valve rod, a valve core, a sampling housing, and a switch thimble. A central channel that penetrates up and down is provided at the upper end of the valve body. An installation through hole whose left end communicates with the central channel is provided on the right side of the upper part of the valve body. The valve rod whose right end is located on the right side of the valve body is hermetically sleeved in the installation through hole. A knob is fixedly installed at the right end of the valve rod. A valve core is fixedly installed at the left end of the valve rod. After the valve core rotates, the upper part and the lower part of the central channel can be communicated with each other or the upper part and the lower part of the central channel can be disconnected from each other. A sampling housing is installed at the lower part of the valve body corresponding to the lower end position of the central channel. An oil discharge channel that penetrates up and down is provided in the sampling housing. A switch thimble that can open and close the oil discharge channel when moving up and down is provided in the oil discharge channel.

[0006] The following is a further optimization and / or improvement of the above-mentioned invention technical solution: A stepped surface may be provided in the middle of the above-mentioned oil discharge channel. An annular baffle is fixedly installed at the upper part of the oil discharge channel. A support plate that is in sealed contact with the stepped surface at the lower end is provided in the oil discharge channel. An elastic reset member sleeved in the oil discharge channel is provided between the upper end of the support plate and the lower end of the baffle. The outer side of the upper part of the switch thimble is slidably installed in the oil discharge channel below the stepped surface. The upper end of the switch thimble is fixedly installed together with the lower end of the support plate. An oil extraction channel whose upper end extends to the outside is provided at the lower end of the switch thimble.

[0007] A guide post may be fixedly installed at the center of the upper end of the above-mentioned support plate. A guide tube is fixedly installed at the lower end of the baffle corresponding to the position of the guide post. The elastic reset member is a compression spring whose upper part is sleeved outside the guide tube, and the lower part of the compression spring is sleeved outside the guide post.

[0008] The above-mentioned oil extraction channel may include an oil groove and an oil hole. An oil groove with an opening downward is provided at the lower end of the switch thimble. A plurality of oil holes communicating with the oil groove are evenly distributed at intervals along the circumference on the outer side of the upper part of the switch thimble.

[0009] The above-mentioned central channel may include a first straight hole, a second straight hole, and a third straight hole that are connected in sequence from top to bottom. The diameters of the first straight hole and the third straight hole are both larger than the diameter of the second straight hole. Two valve seats are provided at intervals up and down at the lower part of the first straight hole. The valve core is hermetically and rotatably installed between the two valve seats. A switch hole whose lower end communicates with the upper end of the second straight hole is provided at the upper end of the valve core. A locking nut whose lower end is in contact with the upper end of the upper valve seat is fixedly installed at the lower part of the first straight hole. A reserved channel whose rear end communicates with the first straight hole is provided at the front side of the lower part of the valve body corresponding to the position below the valve core. A sealing plug is hermetically and fixedly installed in the reserved channel. The outer side of the upper part of the sampling housing is hermetically and fixedly installed inside the third straight hole. A sealing gasket is fixedly installed inside the third straight hole corresponding to the upper end position of the sampling housing.

[0010] At least one fixing frame can be fixedly arranged on the rear side of the valve body from top to bottom in sequence, and the fixing frame is in a U shape with an opening facing forward.

[0011] A sealing cap can be screwed on the outer side of the lower part of the sampling housing.

[0012] The structure of the present invention is reasonable and compact. When in use, the left end of the connecting head is installed together with the sampling port of the insulating sleeve. The left end of the connecting head and the sampling port of the insulating sleeve are detachably and fixedly installed together through a known union joint, which can reduce the disassembly and assembly difficulty between the connecting head and the sampling port. The setting of the air release plug allows the air release plug to be opened during the sampling process to discharge the gas introduced during the installation process, thereby eliminating its pollution to the insulating oil. The design that the right end of the lead-out pipe is bent downward, that is, the right end of the lead-out pipe has a curvature, can reduce the flow resistance of the insulating oil during the sampling process, shorten the sampling time, and also improve the aesthetics. After the left end of the connecting head is installed together with the sampling port of the insulating sleeve, the valve body is located below the insulating sleeve and can maintain a safe distance from the energized part, creating favorable conditions for the operator to sample without power outage. Description of the Drawings

[0013] Attached Figure 1 is the front view sectional structure schematic diagram of the first to seventh embodiments of the present invention.

[0014] Attached Figure 2 is the front view sectional structure schematic diagram of the connecting head in the first to seventh embodiments of the present invention.

[0015] Attached Figure 3 is the left view sectional structure schematic diagram of the valve body in the first to seventh embodiments of the present invention.

[0016] Attached Figure 4 is the left view sectional structure schematic diagram of the valve body when in use in the first to seventh embodiments of the present invention.

[0017] The codes in the drawings are respectively: 1 is the connecting head, 2 is the lead-out pipe, 3 is the air release plug, 4 is the valve body, 5 is the valve rod, 6 is the valve core, 7 is the sampling housing, 8 is the switch thimble, 9 is the air release hole, 10 is the knob, 11 is the oil discharge channel, 12 is the step surface, 13 is the baffle, 14 is the support plate, 15 is the guide post, 16 is the guide tube, 17 is the compression spring, 18 is the oil groove, 19 is the oil hole, 20 is the first straight hole, 21 is the second straight hole, 22 is the third straight hole, 23 is the valve seat, 24 is the switch hole, 25 is the locking nut, 26 is the reserved channel, 27 is the sealing plug, 28 is the sealing gasket, 29 is the fixing frame, 30 is the sealing cap, 31 is the union joint, and 32 is the oil sample bottle. Detailed Embodiments

[0018] The present invention is not limited by the following embodiments, and specific implementation manners can be determined according to the technical solution of the present invention and actual situations.

[0019] In the present invention, for the convenience of description, the description of the relative position relationship of each component is carried out according to the layout mode of the Figure 1 accompanying drawings of the specification. For example, the position relationships such as front, rear, upper, lower, left, and right are determined according to the layout direction of the Figure 1 accompanying drawings of the specification.

[0020] The present invention will be further described below in conjunction with embodiments and the accompanying drawings: Embodiment 1: As shown in the Figures 1 to 4 accompanying drawings, the down-lead type insulating oil sampling device includes a connector 1, a sampling assembly, and an outlet pipe 2. The left end of the outlet pipe 2 is fixedly installed with a connector 1. An air vent 9 communicating inside and outside is provided on the outer side of the upper part of the connector 1. An air vent plug 3 is installed in the air vent 9. The right end of the outlet pipe 2 is bent downward and then fixedly installed with a sampling assembly. The sampling assembly includes a valve body 4, a valve rod 5, a valve core 6, a sampling housing 7, and a switch thimble 8. A central passage penetrating up and down is provided at the upper end of the valve body 4. An installation through hole with its left end communicating with the central passage is provided on the right side of the upper part of the valve body 4. The valve rod 5 with its right end located on the right side of the valve body 4 is hermetically sleeved in the installation through hole. A knob 10 is fixedly installed at the right end of the valve rod 5. A valve core 6 is fixedly installed at the left end of the valve rod 5. After the valve core 6 rotates, the upper and lower parts of the central passage can be communicated with each other or the upper and lower parts of the central passage can be disconnected from each other. A sampling housing 7 is installed at the lower part of the valve body 4 corresponding to the lower end position of the central passage. An oil discharge passage 11 penetrating up and down is provided in the sampling housing 7. A switch thimble 8 that can open and close the oil discharge passage 11 when moving up and down is provided in the oil discharge passage 11.

[0021] According to requirements, the connector 1 is a tubular structure. An air vent 9 communicating inside and outside is provided on the outer side of the upper part of the connector 1. An air vent plug 3 is hermetically screwed in the air vent 9. An air discharge pipe can also be hermetically fixedly installed in the air vent 9, and an air vent plug 3 is hermetically screwed inside the upper end of the air discharge pipe. The length of the right end of the outlet pipe 2 bent downward is greater than the safety distance of the insulating sleeve, that is, the vertical distance between the upper end of the valve body 4 and the left end of the outlet pipe 2 is greater than the safety distance of the insulating sleeve, so that the safety can be improved during the sampling operation.

[0022] Rotate the knob 10. The knob 10 drives the valve core 6 to rotate 90 degrees through the valve rod 5. The upper and lower parts of the central passage are communicated with each other. Rotate the knob 10 in the reverse direction. After the knob 10 drives the valve core 6 to rotate 90 degrees in the reverse direction and reset, the upper and lower parts of the central passage are disconnected from each other, that is, the upper and lower parts of the central passage are not communicated with each other.

[0023] During use, the left end of the connector 1 is installed together with the sampling port of the insulating sleeve. The left end of the connector 1 and the sampling port of the insulating sleeve are detachably and fixedly installed together through a known union 31, which can reduce the disassembly and assembly difficulty between the connector 1 and the sampling port. The setting of the air release plug 3 allows the air release plug 3 to be opened during the sampling process to discharge the gas introduced during the installation process, thereby eliminating its pollution to the insulating oil.

[0024] The design that the right end of the lead-out pipe 2 bends downward, that is, the right part of the lead-out pipe 2 has a curvature, can reduce the flow resistance of the insulating oil during the sampling process, shorten the sampling time, and also improve the aesthetics. After the left end of the connector 1 is installed together with the sampling port of the insulating sleeve, the valve body 4 is located below the insulating sleeve and can maintain a safe distance from the energized part, creating favorable conditions for the operator to take samples without power interruption. For the convenience of connection, the upper end of the central channel and the lower end of the lead-out pipe 2 are connected together through a union or a connecting short section made of 304 material to improve the flexibility and sealing performance of the device.

[0025] The valve body 4 is made of 304 stainless steel, and the lead-out pipe 2 is made of 304 pipe or 316 pipe, which has excellent corrosion resistance, stability and safety. This can effectively prevent the lead-out pipe 2 from undergoing a corrosion reaction and releasing gas during long-term contact with the insulating oil. The lead-out pipe 2 is fixed to the outer shell of the insulating equipment through a pipe clamp. On the one hand, it is grounded through the outer shell to improve safety, and on the other hand, the installation is more tightly and firmly fixed to improve stability.

[0026] According to actual needs, the above-mentioned down-lead type insulating oil sampling device can be further optimized and / or improved: Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 3 、 4 As shown, the middle part of the oil discharge channel 11 has a stepped surface 12, an annular baffle 13 is fixedly installed on the upper part of the oil discharge channel 11, a support plate 14 whose lower end is in sealed contact with the stepped surface 12 is arranged in the oil discharge channel 11, an elastic reset member sleeved in the oil discharge channel 11 is arranged between the upper end of the support plate 14 and the lower end of the baffle 13, the upper outer side of the switch push pin 8 is slidably installed in the oil discharge channel 11 below the stepped surface 12, the upper end of the switch push pin 8 is fixedly installed together with the lower end of the support plate 14, and an oil extraction channel whose upper end extends to the outside is arranged at the lower end of the switch push pin 8.

[0027] During use, by setting the stepped surface 12, the support plate 14 can be limited, and it is also convenient to install the support plate 14. According to requirements, the cross-section of the oil drain channel 11 below the stepped surface 12 can be circular or polygonal, and the cross-section of the switch ejector pin 8 matches the cross-section of the oil drain channel 11. In this embodiment, the cross-sections of the switch ejector pin 8 and the lower part of the oil drain channel 11 are both regular hexagons, so that the switch ejector pin 8 can avoid self-rotation when moving up and down, reducing the wear amount. An oil extraction channel with its upper end extending to the outside of the upper part of the switch ejector pin 8 is provided at the lower end of the switch ejector pin 8, and the baffle 13 is screwed to the inner wall of the upper part of the oil drain channel 11.

[0028] When sampling the insulating oil, the upper end of the bottle mouth of the oil sampling bottle 32 is inserted into the inner side of the lower end of the sampling housing 7 and abuts against the lower end of the switch ejector pin 8 (two top plates can also be fixed inside the bottle mouth of the oil sampling bottle 32, and the upper ends of the top plates abut against the lower end of the switch ejector pin 8). Then, the oil sampling bottle 32 is moved upward forcefully, so that the switch ejector pin 8 moves upward. When the upper end of the oil extraction channel moves above the stepped surface 12, the upper end of the oil extraction channel communicates with the lower end of the central channel. The valve core 6 is rotated so that the upper and lower parts of the central channel communicate with each other. In this way, the oil in the insulating sleeve can flow into the central channel through the sampling port, the connecting head 1 and the lead-out pipe 2, flow through the central channel, the upper part of the oil drain channel 11 and the oil extraction channel, and then flow into the oil sampling bottle 32, realizing the sampling operation of the insulating oil, and the operation is simple and fast.

[0029] Embodiment Three: As an optimization of the above embodiment, as shown in the attached Figure 3 、 4 figure, a guide post 15 is fixedly installed at the center of the upper end of the support plate 14, and a guide tube 16 is fixedly installed at the lower end of the baffle 13 corresponding to the position of the guide post 15. The elastic resetting member is a compression spring 17 with its upper part sleeved on the outside of the guide tube 16, and the lower part of the compression spring 17 is sleeved on the outside of the guide post 15.

[0030] Under normal conditions, under the combined action of the elastic force of the compression spring 17 and the oil pressure, the lower end of the support plate 14 is in sealed contact with the stepped surface 12, which can maintain good sealing performance and prevent the leakage and pollution of the oil.

[0031] During use, by setting the guide post 15 and the guide tube 16, the compression spring 17 can be restricted. During the sampling process, it can prevent the compression spring 17 from swinging during the upward movement of the switch ejector pin 8, which affects the flow of the insulating oil, and can also avoid the abrasive debris generated by the friction between the compression spring 17 and the support plate 14 and the guide plate when the compression spring 17 swings from flowing into the insulating oil sample and affecting the test results.

[0032] Embodiment Four: As an optimization of the above embodiment, as shown in the attached Figure 3 、 4As shown, the oil extraction passage includes an oil groove 18 and an oil hole 19. The lower end of the switch thimble 8 is provided with an oil groove 18 opening downward, and a plurality of oil holes 19 communicating with the oil groove 18 are evenly distributed at intervals along the circumference on the outer side of the upper part of the switch thimble 8. During use, with such a setting, it is convenient for the processing and production of the oil extraction passage.

[0033] Embodiment 5: As an optimization of the above embodiment, as shown in the appendix Figure 3 、 4 As shown, the central passage includes a first straight hole 20, a second straight hole 21, and a third straight hole 22 that are connected in sequence from top to bottom. The diameters of the first straight hole 20 and the third straight hole 22 are both larger than the diameter of the second straight hole 21. Two valve seats 23 are provided at intervals up and down in the lower part of the first straight hole 20. The valve core 6 is sealed and rotatably installed between the two valve seats 23. The upper end of the valve core 6 is provided with a switch hole 24 whose lower end communicates with the upper end of the second straight hole 21. A locking nut 25 whose lower end contacts the upper end of the upper valve seat 23 is fixedly installed in the lower part of the first straight hole 20. A reserved passage 26 whose rear end communicates with the first straight hole 20 is provided on the front side of the lower part of the valve body 4 corresponding to the position below the valve core 6. A sealing plug 27 is fixedly installed in a sealed manner in the reserved passage 26. The outer side of the upper part of the sampling housing 7 is fixedly installed in the third straight hole 22 in a sealed manner. A sealing gasket 28 is fixedly installed on the inner side of the third straight hole 22 corresponding to the upper end position of the sampling housing 7.

[0034] According to requirements, the outer sides of both valve seats 23 are fixedly installed in the first straight hole 20. The valve seats 23 are both annular, and the valve core 6 is spherical. The lower end of the upper valve seat 23 and the upper end of the lower valve seat 23 both have spherical crown surfaces that match the valve core 6. The locking nut 25 is screwed on the inner side of the first straight hole 20. In order to facilitate the disassembly and assembly of the locking nut 25, a plurality of radially penetrating disassembly slots are evenly distributed at intervals along the circumference at the upper end of the locking nut 25 and the upper end of the valve seat 23, which is convenient for the disassembly and assembly of the locking nut 25, thereby facilitating the disassembly and assembly of the valve core 6 and the valve seat 23, reducing the assembly difficulty and the later maintenance cost. The reserved passage 26 is located between the lower part of the lower valve seat 23 and the upper part of the second straight hole 21.

[0035] When the sensor needs to be installed, turn the knob 10 in the reverse direction. The knob 10 drives the valve core 6 to rotate 90 degrees in the reverse direction through the valve stem 5 and then reset. The upper and lower parts of the central channel are disconnected from each other, that is, the upper and lower parts of the central channel are not communicated with each other. Remove the sealing plug 27, and fixedly install the sensor in the reserved channel 26 in a sealed manner. The measuring end of the sensor is located in the first straight hole 20 above the locking nut 25. Install the connector 1 and the sampling port of the insulating sleeve together. Rotate the knob 10 through the valve stem. The knob 10 drives the valve core 6 to rotate 90 degrees through the valve stem 5, and the upper and lower parts of the central channel are communicated with each other. In this way, during the use process, the parameters of the insulating oil in the insulating sleeve can be collected in real time through the sensor, ensuring that the insulating sleeve is always in an effective monitoring state. By setting the sealing gasket 28, the sealing performance between the sampling housing 7 and the valve body 4 can be ensured, preventing oil leakage and improving the safety during the operation of the insulating sleeve. The ball valve controls the opening and closing of the insulating oil and the flow regulation through the knob 10, realizing the precise control of the sampling process.

[0036] Embodiment Six: As an optimization of the above embodiment, as shown in the appended Figure 1 、 3 、Figure 4, at least one fixing frame 29 is fixedly installed on the rear side of the valve body 4 from top to bottom in sequence. The fixing frame 29 is in a U-shaped structure with an opening facing forward.

[0037] During the use process, through such a setting, the existing well-known clamp can be passed through the fixing frame 29 to fixedly install the valve body 4 on the outside of the equipment (the outside of the support rod below the insulating sleeve), or two connecting screw holes can be arranged at intervals on the upper side of the valve body 4, and the valve body 4 and the equipment (the support frame below the insulating sleeve) can be fixedly installed together by using the connecting bolts screwed into the connecting screw holes, which is convenient for the disassembly and assembly of the valve body 4.

[0038] Embodiment Seven: As an optimization of the above embodiment, as shown in the appended Figure 3 Figure 5, a sealing cap 30 is screwed on the outer side of the lower part of the sampling housing 7.

[0039] According to requirements, the sealing cap 30 is in a cylindrical structure with an open upper end and a closed lower end. A sealing gasket is installed between the sealing cap 30 and the sampling housing 7 to increase the sealing performance. During the use process, by setting the sealing cap 30, dust can be prevented from entering the inside of the sampling housing 7, thereby avoiding the dust attached to the surface of the sampling housing 7 from entering the sampling container along with the flowing out insulating oil and affecting the detection result during the sampling process.

[0040] The valve body 4 of the present invention is placed below the insulating bushing and maintains a safe distance from the energized part, creating favorable conditions for the operator to take samples without power outage. The structure of the valve body 4 is compact and stable. The reserved channel 26 can add existing well-known sensors (such as a single hydrogen sensor for detecting hydrogen content or an oil pressure sensor for detecting the pressure of insulating oil) when needed, ensuring that the insulating bushing is always in an effective monitoring state. It can solve the problem of insufficient oil sample detection of the existing monitoring device and can quickly and safely take samples during the operation of the insulating bushing.

[0041] The fixed frame 29 at the rear side of the valve body 4 can ensure the stable installation of the device on the outer shell of the insulating equipment, prevent loosening caused by vibration or external force, improve the stability of the device. The lead-out pipe 2 is fixed on the outer shell of the insulating equipment through steel sheets. On the one hand, it is grounded through the outer shell to improve safety, and on the other hand, the installation is more tightly and firmly, enhancing stability.

[0042] The present invention is ingeniously designed. Through the lower sampling assembly, the full circulation of the oil sample is realized. By leading down the oil sampling port, the sampling difficulty is reduced and the sampling convenience is improved. The attached reserved channel 26 provides favorable conditions for adding sensors when the equipment is abnormal, improves the reliability of monitoring, and provides technical support for diagnosing the health status of the equipment. The present invention ensures the circulation of the insulating oil at the monitoring port and can quickly and safely take samples during the operation of the insulating bushing.

[0043] Rotate the valve core 6, and the insulating oil in the lead-out pipe 2 will smoothly enter the valve body 4. Move the switch push rod 8 upward, and it can be used for the rapid sampling of insulating oil. The reserved channel 26 is used to install a standby sensor. The insulating oil can be detected in real time through the standby sensor. When the main sensor installed on the insulating bushing fails, the oil liquid state can still be detected through the standby sensor.

[0044] During the sampling of insulating oil, the upper end of the bottle mouth of the oil liquid sampling bottle 32 is abutted against the lower end of the switch push rod 8, and the switch push rod 8 is moved upward. The switch push rod 8 compresses the compression spring 17. At this time, the oil discharge channel 11 and the oil sampling channel communicate with each other, and the insulating oil enters the oil liquid sampling bottle 32 to complete the sampling operation of the insulating oil.

[0045] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and implementation effects. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A down-drawing insulating oil sampling device, characterized in that The valve body is provided with a plurality of air outlet holes, and the plurality of air outlet holes are provided with a plurality of air outlet holes, and the plurality of air outlet holes are provided with a plurality of air outlet holes.

2. The down-lead insulating oil sampling device according to claim 1 is characterized in that The oil drain channel has a step surface in the middle, an annular baffle is fixedly installed on the upper part of the oil drain channel, a support plate whose lower end is in sealing contact with the step surface is provided in the oil drain channel, an elastic reset member sleeved in the oil drain channel is provided between the upper end of the support plate and the lower end of the baffle, the outer side of the upper part of the switch ejector pin is slidably installed in the oil drain channel below the step surface, the upper end of the switch ejector pin is fixedly installed together with the lower end of the support plate, and the lower end of the switch ejector pin is provided with an oil intake channel whose upper end extends to the outside.

3. The down-lead insulating oil sampling device according to claim 2 is characterized in that A guide column is fixedly installed at the center of the upper end of the support plate, a guide tube is fixedly installed at the lower end of the baffle corresponding to the position of the guide column, and the elastic reset member is a compression spring whose upper part is sleeved on the outer side of the guide tube, and whose lower part is sleeved on the outer side of the guide column.

4. The downward-drawing insulating oil sampling device according to claim 2 or 3, characterized in that The oil taking passage comprises an oil groove and oil holes. The lower end of the switch ejector pin is provided with an oil groove opening downward, and the outer side of the upper part of the switch ejector pin is evenly spaced along the circumference and provided with a plurality of oil holes connected with the oil groove.

5. The downward-drawing insulating oil sampling device according to claim 1, 2 or 3, characterized in that The central channel includes a first straight hole, a second straight hole and a third straight hole which are connected in sequence from top to bottom. The diameters of the first straight hole and the third straight hole are both larger than the diameter of the second straight hole. Two valve seats are arranged at intervals at the upper and lower parts of the lower part of the first straight hole. The valve core is rotatably installed between the two valve seats. A switch hole is arranged at the upper end of the valve core, the lower end of which is connected to the upper end of the second straight hole. A locking nut is fixedly installed at the lower part of the first straight hole, the lower end of which is in contact with the upper end of the valve seat. A reserved channel is arranged at the front side of the lower part of the valve body corresponding to the position below the valve core, the rear end of which is connected to the first straight hole. A sealing plug is fixedly installed in the reserved channel. The outer side of the upper part of the sampling shell is fixedly installed on the inner side of the third straight hole. A sealing gasket is fixedly installed on the inner side of the third straight hole corresponding to the upper end of the sampling shell.

6. The down-lead insulating oil sampling device according to claim 4 is characterized in that The central passage includes a first straight hole, a second straight hole, and a third straight hole that are connected in sequence from top to bottom. The diameters of the first straight hole and the third straight hole are both larger than the diameter of the second straight hole. Two valve seats are provided at intervals up and down in the lower part of the first straight hole. The valve core is rotatably and sealingly installed between the two valve seats. A switch hole is provided at the upper end of the valve core, and the lower end of the switch hole communicates with the upper end of the second straight hole. A locking nut is fixedly installed at the lower part of the first straight hole, and the lower end of the locking nut is in contact with the upper end of the upper valve seat. A reserved passage with its rear end communicating with the first straight hole is provided on the front side of the lower part of the valve body corresponding to the position below the valve core. A sealing plug is fixedly installed in the reserved passage in a sealed manner. The outer side of the upper part of the sampling housing is fixedly installed in the inner side of the third straight hole in a sealed manner, and a sealing gasket is fixedly installed on the inner side of the third straight hole corresponding to the upper end position of the sampling housing.

7. The downward-drawing insulating oil sampling device according to claim 1, 2, 3 or 6, characterized in that At least one fixing frame is fixedly installed on the rear side of the valve body from top to bottom in sequence, and the fixing frame is in a C-shaped with an opening facing forward; or / and, a sealing cap is screwed on the outer side of the lower part of the sampling housing.

8. The down-lead insulating oil sampling device according to claim 4 is characterized in that At least one fixing frame is fixedly installed on the rear side of the valve body from top to bottom in sequence, and the fixing frame is in a C-shaped with an opening facing forward; or / and, a sealing cap is screwed on the outer side of the lower part of the sampling housing.

9. The down-lead insulating oil sampling device according to claim 5, characterized in that There are at least one fixing frame on the rear side of the valve body from top to bottom in sequence, and the fixing frame is in a C-shaped with an opening facing forward; or / and, a sealing cap is screwed on the outer side of the lower part of the sampling housing.

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