CN210063972U - Special benzyl toluene insulating oil storage device - Google Patents

Special benzyl toluene insulating oil storage device Download PDF

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Publication number
CN210063972U
CN210063972U CN201920598193.3U CN201920598193U CN210063972U CN 210063972 U CN210063972 U CN 210063972U CN 201920598193 U CN201920598193 U CN 201920598193U CN 210063972 U CN210063972 U CN 210063972U
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transportation
tank
vacuum
fixed
jar
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CN201920598193.3U
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Chinese (zh)
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龙国忠
郑尧军
姚茂红
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Jiangxi Tianyi Special Oil Co Ltd
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Jiangxi Tianyi Special Oil Co Ltd
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Abstract

The utility model belongs to the technical field of the electrical industry technique and specifically relates to a isolated plant is deposited to benzyl toluene insulating oil, including the transportation jar, the fixed universal wheel that is equipped with in bottom of transportation jar, the front of transportation jar is embedded to have the PLC controller, the fixed transportation cover that is equipped with on the jar mouth of transportation jar, the fixed cover handle that is equipped with on the terminal surface of transportation cover, one side of cover handle is and be located the fixed transportation jar vacuum meter that is equipped with on the terminal surface of transportation cover, the welding has the link on the transportation jar, the link rotates through the pivot and is connected with threaded connection pole, threaded connection pole passes U type connecting block and is connected with fixed thread bush. The utility model discloses an in-process of design storage and sample all is in vacuum state, has guaranteed the accuracy nature of experiment, and then has improved the efficiency equipment of work and can not put into production delayed power transmission on schedule, has practiced thrift manpower and materials to the performance of equipment safe handling has been improved.

Description

Special benzyl toluene insulating oil storage device
Technical Field
The utility model relates to an electrical industry technical field specifically is a special device is deposited to benzyl toluene insulating oil.
Background
The existing device for storing the insulating oil belongs to a simple open type sampling box, residual insulating oil can be stored after sampling, air enters the sampling box when the sampling box is opened, so that the influence of atmospheric moisture degree under weather and climate conditions can be caused by frequent operation, the influence of transportation and storage environments can be caused, the influence of moisture on oil quality and insulation can be easily caused, indexes such as micro-water chromatography deviate from true values, when an experimental result is taken as the basis of production, the breakdown voltage can be reduced sharply, the authenticity of oil data is influenced by the deviation of parameters from the true values, data misjudgment is caused, repeated sampling is caused, projects and maintenance delay is caused, equipment cannot be put into production on schedule, the power transmission is delayed, manpower and material resources are wasted, and the traffic risk is greater.
To sum up, the utility model discloses a special device is deposited to benzyl toluene insulating oil of design solves the problem that this type of exists.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a isolated oil deposits isolated plant of benzyl toluene to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a special benzyl toluene insulating oil storage device comprises a transportation tank, wherein universal wheels are fixedly arranged at the bottom of the transportation tank, a PLC controller is embedded in the front of the transportation tank, a transportation tank cover is fixedly arranged on a tank opening of the transportation tank, a tank cover handle is fixedly arranged on the end face of the transportation tank cover, a transportation tank vacuum meter is fixedly arranged on one side of the tank cover handle and positioned on the end face of the transportation tank cover, a connecting frame is welded on the transportation tank, the connecting frame is rotatably connected with a threaded connecting rod through a rotating shaft, the threaded connecting rod penetrates through a U-shaped connecting block to be connected with a fixed threaded sleeve, the U-shaped connecting block is fixedly arranged on the transportation tank cover, a silica gel layer is fixedly arranged on the inner wall of the transportation tank, a vacuum tank is arranged at the bottom inside of the transportation tank and corresponds to the silica gel layer, the outer wall of the vacuum tank is connected to the side, the end face center position of the vacuum tank is fixedly connected with one end of a pipeline, the other end of the pipeline is fixedly connected with the center position of the bottom of the liquid storage tank, a first electromagnetic valve is fixedly arranged on the pipeline, the bottom of the liquid storage tank is uniformly and fixedly connected with one end of a plurality of support rods around the pipeline, the other end of each support rod is fixedly connected with the top of the vacuum tank, one end of a liquid outlet pipeline is fixedly arranged at the bottom of the right side of the vacuum tank, the other end of the liquid outlet pipeline sequentially penetrates through the silica gel layer and the transportation tank and extends to the outside of the transportation tank to be connected with a first pipeline joint, one end of a vacuum tank connecting pipe is fixedly arranged at the top of the left side of the vacuum tank, the other end of the vacuum tank connecting pipe sequentially penetrates through the silica gel layer and the transportation tank and extends to the outside of the transportation, the other end of the liquid inlet pipeline sequentially penetrates through the silica gel layer and the transportation tank and extends to the outside of the transportation tank to be connected with a second pipeline joint, one end of a liquid storage tank connecting pipe is fixedly arranged at the top of the left side of the transportation tank, the other end of the liquid storage tank connecting pipe sequentially penetrates through the silica gel layer and the transportation tank and extends to the outside of the transportation tank to be connected with a liquid storage tank vacuum gauge, a vacuum pump mounting frame is fixedly arranged inside the transportation tank and close to the transportation tank cover, a vacuum pump is fixedly arranged on the vacuum pump mounting frame, the air exhaust end of the vacuum pump is connected with one end of a cross four-way joint through an air pipe, the cross four-way joint is respectively connected with one point of a first connecting pipeline, a second connecting pipeline and a third connecting pipeline, the other end of the first connecting pipeline is connected with the liquid storage tank, a second, the other end of third connecting tube is connected at the vacuum tank, the last fixed fourth solenoid valve that is equipped with of third connecting tube, the one end of air-out end fixed connection fourth connecting tube of vacuum pump, the other end of fourth connecting tube runs through silica gel layer, transportation jar in proper order and extends to the external connection of transportation jar and has the third pipe connection, the inside fixed fifth solenoid valve that is equipped with that is located the transportation jar on the fourth pipeline.
Preferably, the universal wheels are four and encircle the transport tank and the like, and the universal wheels are lockable.
Preferably, the connecting frame sets up four and encircles the equal angle settings of transport tank, four the connecting frame corresponds and is equipped with four threaded connection poles, four U type connecting blocks, four fixed thread bushings, threaded connection pole and fixed thread bushing's connected mode is threaded connection.
Preferably, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve are all of VT307-6G1-02 type and are respectively electrically connected with the PLC controller through conducting wires.
Preferably, the vacuum pump is T0103242 and is electrically connected to the PLC through a wire.
Preferably, the outer wall of the liquid storage tank is connected to the side wall inside the transport tank through a reinforcing rib, and the U-shaped connecting block is movably connected with the threaded connecting rod.
Preferably, the first pipeline joint, the second pipeline joint and the third pipeline joint are self-locking connecting pipelines.
Compared with the prior art, the beneficial effects of the utility model are that:
1. in the utility model, the vacuum state is designed in the storage and sampling process, thereby avoiding the residual insulating oil storage after sampling, because air enters the sampling box when the vacuum insulation device is opened, the frequent operation can cause the influence of the atmospheric moisture degree under weather and climate conditions, the indexes such as insulation and micro-water chromatography are easily affected by moisture of the oil, when the experimental result is taken as the basis of production, the breakdown voltage can be rapidly reduced, the parameter deviation from the real value affects the authenticity of the oil data, the data misjudgment is caused, the repeated sampling is caused, the project and the maintenance delay are caused, the equipment can not be put into production according to time and delay power transmission, manpower and material resources are wasted, and the problem of large traffic risk is caused, thereby ensuring the accuracy of the experiment, further improving the working efficiency and the equipment can not be put into production according to time and delay power transmission, and saving manpower and material resources, and the safe use performance of the equipment is improved.
2. The utility model discloses in, through design compact structure, practicality is stronger, consequently more suitable using widely on a large scale.
Drawings
FIG. 1 is a main view of the utility model;
FIG. 2 is a schematic view of the cross-sectional structure of the present invention;
fig. 3 is a schematic view of the left side view cross-section structure of the present invention.
In the figure: 1-transport tank, 2-universal wheel, 3-PLC controller, 4-transport tank cover, 5-tank cover handle, 6-transport tank vacuum meter, 7-connecting frame, 8-threaded connecting rod, 9-U-shaped connecting block, 10-silica gel layer, 11-vacuum tank, 12-reinforcing rib, 13-pipeline, 14-liquid storage tank, 15-first electromagnetic valve, 16-supporting rod, 17-liquid outlet pipeline, 18-first pipeline joint, 19-vacuum tank connecting pipe, 20-vacuum tank vacuum meter, 21-liquid inlet pipeline, 22-second pipeline joint, 23-liquid storage tank connecting pipe, 24-liquid storage tank vacuum meter, 25-vacuum pump mounting rack, 26-vacuum pump, 27-cross four-way, 28-first connecting pipeline, 28-cross-vacuum pump mounting rack, 24-vacuum pump mounting rack, 9-vacuum pump, 24-vacuum pump mounting rack, and the like, 29-a second connecting pipeline, 30-a third connecting pipeline, 31-a second electromagnetic valve, 32-a third electromagnetic valve, 33-a fourth electromagnetic valve, 34-a fourth connecting pipeline, 35-a third pipeline joint, 36-a fifth electromagnetic valve and 37-a fixed thread sleeve.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution:
a special benzyl toluene insulating oil storage device comprises a transportation tank 1, wherein a universal wheel 2 is fixedly arranged at the bottom of the transportation tank 1, a PLC 3 is embedded in the front of the transportation tank 1, a transportation tank cover 4 is fixedly arranged on a tank opening of the transportation tank 1, a tank cover handle 5 is fixedly arranged on the end surface of the transportation tank cover 4, a transportation tank vacuum meter 6 is fixedly arranged on one side of the tank cover handle 5 and positioned on the end surface of the transportation tank cover 4, a connecting frame 7 is welded on the transportation tank 1, the connecting frame 7 is rotatably connected with a threaded connecting rod 8 through a rotating shaft, the threaded connecting rod 8 penetrates through a U-shaped connecting block 9 to be connected with a fixed threaded sleeve 37, the U-shaped connecting block 9 is fixedly arranged on the transportation tank cover 4, a silica gel layer 10 is fixedly arranged on the inner wall of the transportation tank 1, a vacuum tank 11 is correspondingly arranged at the bottom inside the transportation tank 1 and corresponds to the silica gel layer 10, the outer wall, the end face center position of the vacuum tank 11 is fixedly connected with one end of a pipeline 13, the other end of the pipeline 13 is fixedly connected with the center position of the bottom of a liquid storage tank 14, a first electromagnetic valve 15 is fixedly arranged on the pipeline 13, the bottom of the liquid storage tank 14 is uniformly and fixedly connected with one end of a plurality of support rods 16 surrounding the pipeline 13, the other end of each support rod 16 is fixedly connected with the top of the vacuum tank 11, one end of a liquid outlet pipeline 17 is fixedly arranged at the bottom of the right side of the vacuum tank 11, the other end of the liquid outlet pipeline 17 sequentially penetrates through a silica gel layer 10, the transportation tank 1 is extended to the outside of the transportation tank 1 and is connected with a first pipeline connector 18, one end of a vacuum tank connecting pipe 19 is fixedly arranged at the top of the left side of the vacuum tank 11, the other end of the vacuum tank connecting pipe 19 sequentially penetrates through the silica gel layer 10, the outside of the transportation, the other end of the liquid inlet pipeline 21 sequentially penetrates through the silica gel layer 10, the transportation tank 1 and extends to the outside of the transportation tank 1, a second pipeline joint 22 is connected with the outside of the transportation tank 1, one end of a liquid storage tank connecting pipe 23 is fixedly arranged at the top of the left side of the transportation tank 1, the other end of the liquid storage tank connecting pipe 23 sequentially penetrates through the silica gel layer 10, the transportation tank 1 and extends to the outside of the transportation tank 1 are connected with a liquid storage tank vacuum gauge 24, a vacuum pump mounting rack 25 is fixedly arranged in the transportation tank 1 and close to the transportation tank cover 4, a vacuum pump 26 is fixedly arranged on the vacuum pump mounting rack 25, the air exhaust end of the vacuum pump 26 is connected with one end of a cross four-way 27 through an air pipe, the cross four-way 27 is respectively connected with one point of a first connecting pipeline 28, a second connecting pipeline 29 and a third connecting, fixed third solenoid valve 32 that is equipped with on the second connecting tube 29, the other end of third connecting tube 29 is connected at vacuum tank 11, the fixed fourth solenoid valve 33 that is equipped with on the third connecting tube 29, the one end of air-out fixed connection fourth connecting tube 34 of vacuum pump 26, the other end of fourth connecting tube 34 runs through silica gel layer 10 in proper order, transportation tank 1 and the external connection who extends to transportation tank 1 have third pipe joint 35, on the fourth pipeline 34 and be located the fixed fifth solenoid valve 36 that is equipped with in inside of transportation tank 1.
The utility model discloses work flow: when the vacuum pump works, on the premise that the first electromagnetic valve 15, the second electromagnetic valve 31, the third electromagnetic valve 32, the fourth electromagnetic valve 33 and the fifth electromagnetic valve 36 are respectively and electrically connected with the PLC controller 3 through conducting wires and the vacuum pump 26 is electrically connected with the PLC controller 3 through conducting wires, the equipment is electrified, at the moment, the PLC controller 3 is operated to control the vacuum pump 26 to work, meanwhile, the first electromagnetic valve 15, the second electromagnetic valve 31, the third electromagnetic valve 32, the fourth electromagnetic valve 33 and the fifth electromagnetic valve 36 are in an open state, further, the first connecting pipeline 28 and the liquid storage tank 14 are further enabled, the second connecting pipeline 29 and the transportation tank 1, the third connecting pipeline 30 and the vacuum tank 11 are further enabled to be in a communication state through the pipeline 13 and the vacuum tank 11, so that the vacuum pump 26 extracts air in the transportation tank 1, the vacuum tank 11 and the liquid storage tank 14, and the extracted air flows along the first connecting pipeline 28, The second connecting pipe 29 and the third connecting pipe 30 flow and are finally discharged from a third pipe joint 35 on a fourth connecting pipe 34, the numerical values of the transport tank vacuum gauge 6, the vacuum tank vacuum gauge 20 and the liquid storage tank vacuum gauge 24 are observed to be large while the vacuum pump 26 is pumping, when the transport tank vacuum gauge 6, the vacuum tank vacuum gauge 20 and the liquid storage tank vacuum gauge 24 reach preset numerical values, the PLC 3 is operated to control the first electromagnetic valve 15, the second electromagnetic valve 31, the third electromagnetic valve 32, the fourth electromagnetic valve 33 and the fifth electromagnetic valve 36 to be closed, so that the interiors of the transport tank 1, the vacuum tank 11 and the liquid storage tank 14 are ensured to be in a vacuum state, when the transport tank vacuum gauge 6, the vacuum tank vacuum gauge 20 and the liquid storage tank gauge 24 all reach preset numerical values, the battery valves are in a closed state, and the second pipe joint 22 is connected to an oil outlet on the benzyl toluene insulating oil tank body, introduce benzyl toluene insulating oil into liquid storage pot 14, introduce the back and break off second pipe joint 22 and connection structure after accomplishing, because second pipe joint 22 is for self-locking and then guarantee that liquid storage pot 14 is inside to be in the vacuum, and then carry out corresponding transportation to transport tank 1, in the in-process of transportation, because inside is equipped with silica gel layer 10, play certain heat preservation, thermal-insulated, absorbing effect, avoided because the problem of the influence of the in-process temperature of transportation, when the sample, operation PLC controller 3 control first solenoid valve 15 is opened, flow benzyl toluene insulating oil of putting in the liquid storage pot 14 to vacuum tank 11 from pipeline 13, after the sample is accomplished, operation PLC controller 3 control first solenoid valve 15 is closed, connect first pipe joint 18 soft pipeline and extend to check out equipment, emit, after emitting and accomplishing, disconnect first pipe joint 18 and connection structure, because the first pipe joint 18 is self-locking and further ensures that the inside of the vacuum tank 11 is in vacuum, at the moment, the PLC controller 3 is operated to control the vacuum pump 26 to work, the fourth electromagnetic valve 33 is opened, the third connecting pipe 30 and the vacuum tank 11 are further enabled, the vacuum pump 26 extracts air in the vacuum tank 11, the extracted air flows along the third connecting pipe 30 and is finally discharged from the third pipe joint 35 on the fourth connecting pipe 34, the vacuum pump 26 extracts the scale value of the vacuum gauge 20 of the vacuum tank at the same time, when the vacuum gauge 20 of the vacuum tank reaches the preset value, the PLC controller 3 is operated to be closed, so that the inside of the vacuum tank 11 is ensured to be in vacuum state and prepared for next sampling, the process is in vacuum state in the storage and sampling processes, and the phenomenon that residual insulating oil can be stored after sampling is avoided, because air enters the sampling box when the sampling box is opened, frequent operation can cause the influence of atmospheric moisture degree under weather and climate conditions, and the problem that indexes such as insulation, micro water chromatography and the like are influenced by the moisture of oil quality are easy to deviate from the true value is easily caused, so that the accuracy of an experiment is ensured, the efficiency of work is improved, equipment cannot be put into production according to time for delayed power transmission, manpower and material resources are saved, and the safety use performance of the equipment is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A isolated oil deposits isolated plant of benzyl toluene, includes transportation tank (1), its characterized in that: the bottom of the transportation tank (1) is fixedly provided with universal wheels (2), the front of the transportation tank (1) is embedded with a PLC (programmable logic controller) (3), a transportation tank cover (4) is fixedly arranged on a tank opening of the transportation tank (1), a tank cover handle (5) is fixedly arranged on the end face of the transportation tank cover (4), a transportation tank vacuum meter (6) is fixedly arranged on one side of the tank cover handle (5) and on the end face of the transportation tank cover (4), a connecting frame (7) is welded on the transportation tank (1), the connecting frame (7) is rotatably connected with a threaded connecting rod (8) through a rotating shaft, the threaded connecting rod (8) penetrates through a U-shaped connecting block (9) to be connected with a fixed threaded sleeve (37), the U-shaped connecting block (9) is fixedly arranged on the transportation tank cover (4), and a silica gel layer (10) is fixedly arranged on the inner wall of the transportation tank (, the inside bottom of transport tank (1) and correspond with silica gel layer (10) and be equipped with vacuum tank (11), the outer wall of vacuum tank (11) passes through strengthening rib (12) and connects on the inside lateral wall of transport tank (1), the terminal surface central point of vacuum tank (11) puts the one end of fixed connection pipeline (13), the other end fixed connection of pipeline (13) puts at the central point of liquid storage pot (14) bottom, the fixed first solenoid valve (15) that are equipped with on pipeline (13), the bottom of liquid storage pot (14) and the one end that encircles the even fixedly connected with a plurality of bracing pieces (16) of pipeline (13), the other end fixed connection of bracing piece (16) is at the top of vacuum tank (11), the fixed one end that is equipped with out liquid pipeline (17) of right side bottom department of vacuum tank (11), the other end that goes out liquid pipeline (17) runs through silica gel layer (10) in proper order, Transportation jar (1) and the external connection who extends to transportation jar (1) have first pipe joint (18), the fixed one end that is equipped with vacuum jar connecting pipe (19) of left side top department of vacuum jar (11), the other end of vacuum jar connecting pipe (19) runs through silica gel layer (10), transportation jar (1) in proper order and extends to the external connection who transports jar (1) has vacuum jar vacuum table (20), the fixed one end that is equipped with inlet fluid pipeline (21) of right side top department of liquid storage pot (14), the other end of inlet fluid pipeline (21) runs through silica gel layer (10), transportation jar (1) in proper order and extends to the external connection who transports jar (1) has second pipe joint (22), the fixed one end that is equipped with liquid storage pot connecting pipe (23) of left side top department of transportation jar (1), the other end of liquid storage pot connecting pipe (23) runs through silica gel layer (10) in proper order, The transportation tank (1) and the external connection that extends to the transportation tank (1) have a liquid storage tank vacuum gauge (24), the transportation tank (1) is inside and is close to the fixed vacuum pump mounting bracket (25) that is equipped with of transportation tank cover (4) department, the fixed vacuum pump (26) that is equipped with on vacuum pump mounting bracket (25), the end of bleeding of vacuum pump (26) is connected with the one end of cross (27) through the trachea, be connected with the point of first connecting tube (28), second connecting tube (29) and third connecting tube (30) respectively on cross (27), the other end of first connecting tube (28) is connected in liquid storage tank (14), fixed second solenoid valve (31) that is equipped with on first connecting tube (28), fixed third solenoid valve (32) that is equipped with on second connecting tube (29), the other end of third connecting tube (30) is connected in vacuum tank (11), the fixed fourth solenoid valve (33) that is equipped with on third connecting tube (30), the one end of air-out end fixed connection fourth connecting tube (34) of vacuum pump (26), the other end of fourth connecting tube (34) runs through silica gel layer (10), transportation jar (1) in proper order and extends to the external connection of transportation jar (1) has third pipe connection (35), on fourth connecting tube (34) and be located the inside fixed fifth solenoid valve (36) that is equipped with of transportation jar (1).
2. The special benzyl toluene insulating oil storage device according to claim 1, characterized in that: the universal wheel (2) sets up four and encircles transportation jar (1) equal angle setting, universal wheel (2) are the universal wheel that can lock.
3. The special benzyl toluene insulating oil storage device according to claim 1, characterized in that: the connecting frame (7) is provided with four connecting frames and surrounds the transportation tank (1) and is arranged at an equal angle, four connecting frames (7) are correspondingly provided with four threaded connecting rods (8), four U-shaped connecting blocks (9) and four fixed threaded sleeves (37), and the connecting mode of the threaded connecting rods (8) and the fixed threaded sleeves (37) is threaded connection.
4. The special benzyl toluene insulating oil storage device according to claim 1, characterized in that: the first electromagnetic valve (15), the second electromagnetic valve (31), the third electromagnetic valve (32), the fourth electromagnetic valve (33) and the fifth electromagnetic valve (36) are all VT307-6G1-02 in type and are respectively and electrically connected with the PLC controller (3) through conducting wires.
5. The special benzyl toluene insulating oil storage device according to claim 1, characterized in that: the vacuum pump (26) is T0103242 in model and is electrically connected to the PLC controller (3) through a lead.
6. The special benzyl toluene insulating oil storage device according to claim 1, characterized in that: the outer wall of the liquid storage tank (14) is connected to the side wall inside the transportation tank (1) through a reinforcing rib (12), and the U-shaped connecting block (9) is movably connected with the threaded connecting rod (8).
7. The special benzyl toluene insulating oil storage device according to claim 1, characterized in that: the first pipeline joint (18), the second pipeline joint (22) and the third pipeline joint (35) are self-locking connecting pipelines.
CN201920598193.3U 2019-04-28 2019-04-28 Special benzyl toluene insulating oil storage device Active CN210063972U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920598193.3U CN210063972U (en) 2019-04-28 2019-04-28 Special benzyl toluene insulating oil storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920598193.3U CN210063972U (en) 2019-04-28 2019-04-28 Special benzyl toluene insulating oil storage device

Publications (1)

Publication Number Publication Date
CN210063972U true CN210063972U (en) 2020-02-14

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Application Number Title Priority Date Filing Date
CN201920598193.3U Active CN210063972U (en) 2019-04-28 2019-04-28 Special benzyl toluene insulating oil storage device

Country Status (1)

Country Link
CN (1) CN210063972U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115924318A (en) * 2022-10-28 2023-04-07 云南电网有限责任公司大理供电局 Oil sample transport case

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115924318A (en) * 2022-10-28 2023-04-07 云南电网有限责任公司大理供电局 Oil sample transport case

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