Negative pressure type oil suction pump for transformer bushing

Abstract

The invention relates to the field of transformer bushing maintenance, and provides a negative pressure type oil suction pump for a transformer bushing to solve the problems of low efficiency, easy oil leakage, tedious operation and poor environmental adaptability in traditional oil change operation. According to the oil suction pump, efficient and thorough discharge of waste oil is achieved through the negative pressure technology, and the residue problem of a gravity oil discharge mode is avoided. The device adopts an integrated design, comprises a shell, a control assembly, a direct-current power supply, an oil pump body and a pipeline assembly, and can be quickly disassembled and assembled and adapt to various transformer bushing interfaces. The control assembly comprises a data acquisition module, a micro control module and a display interaction module and is used for monitoring and adjusting oil absorption parameters in real time, and meanwhile a high-definition display screen is arranged for state display and operation input. The sealing design that the oil suction gun and the multi-model sleeve are connected with the apron ensures sealing and no oil leakage in the operation process.

Description

Technical Field

[0001] The invention relates to the technical field of transformer bushing maintenance, and in particular to a transformer bushing negative pressure oil suction pump. Background Art

[0002] The transformer bushing is a key insulating component used to lead the internal high and low voltage leads out of the oil tank. The transformer bushing oil is a key element for the safe operation of the transformer bushing, and it has specific physical and chemical properties. The replacement cycle of the transformer bushing oil is affected by many factors. Under normal operating environment and load, the oil quality is generally tested once every 3-5 years. If it has been running for a long time, the oil can be changed in advance; in harsh environments such as humid, dusty, and chemically polluted outdoor environments, a comprehensive test is conducted every 1-2 years, and the oil quality is replaced in time if it deteriorates; special environments such as high altitudes, cold weather, and coastal areas require more frequent testing and early replacement as appropriate; when running at high load (above 80%), the oil is tested every 2-3 years. If the load rate often exceeds the rated capacity, it may need to be tested annually and replaced in advance as needed. When the load fluctuates greatly, it is also necessary to pay more attention to the oil quality and test it to determine the replacement time.

[0003] In practice, when the oil in the bushing is replaced, the oil drain pipe is usually inserted into the oil drain port below the bushing, and the waste oil is naturally discharged by gravity. However, the waste oil cannot be completely discharged. The injection of new oil and the mixture with the waste oil will affect the performance and service life of the new oil. Therefore, the bushing needs to be removed to completely drain the waste oil. The process is time-consuming and labor-intensive, and the transformer needs to be powered off for a long time for maintenance, which not only affects the normal electricity consumption of users, but may also lead to uneven load distribution of the power grid and increase the burden on other transformers.

[0004] Therefore, it is necessary to develop an oil suction pump specifically for replacing transformer bushing oil, so as to improve the efficiency of oil change and save manpower. Summary of the invention

[0005] In view of the above shortcomings, the present invention provides a method for improving the replacement efficiency of transformer bushing oil and reducing the time required for oil replacement.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A transformer bushing negative pressure oil suction pump comprises a shell, a control component, a DC power supply, an oil pump body and a pipeline component, wherein the DC power supply is electrically connected to the control component and the oil pump body, the control system is electrically connected to the oil pump body to control the oil pump body, the control component, the DC power supply and the oil pump body are installed in the shell, the pipeline component passes through the shell and is sealed and connected to the oil pump body and is used to be plugged into the oil discharge port of the transformer bushing.

[0008] Preferably, the control component includes a display interaction module, a micro control module and a data acquisition module. The data acquisition module is arranged on the oil pump body. The data acquisition module is electrically connected to the micro control module. The display interaction module is electrically connected to the micro control module to implement command input and data display. The micro control module is electrically connected to the oil pump body to control the start and stop of the oil pump body.

[0009] Preferably, the pipeline assembly includes a connecting pipe, an oil suction pipe and an oil discharge pipe, the connecting pipe includes an oil suction connecting pipe and an oil discharge connecting pipe, the oil pump body is provided with an oil suction port and an oil discharge port, the oil suction connecting pipe is sealingly connected to the oil suction port of the oil pump body, the oil discharge connecting pipe is sealingly connected to the oil outlet of the oil pump body, the oil suction connecting pipe passes through the outer casing and is sealingly connected to the oil suction pipe, the oil discharge connecting pipe passes through the outer casing and is sealingly connected to the oil discharge pipe, and the oil suction pipe is sealingly plugged into the oil discharge port of the transformer bushing.

[0010] Preferably, it also includes a casing connection apron, which is arranged on the oil suction pipe.

[0011] Preferably, the oil suction connecting pipe and the oil discharge connecting pipe are provided with a quick disconnecting device so as to quickly disconnect the oil suction pipe and the oil discharge pipe.

[0012] Preferably, the bushing connection apron has multiple models to correspond to the connection of transformer bushings of different sizes.

[0013] Preferably, the sleeve connecting apron includes an apron body, which is a cylindrical sleeve with one end sealed. A thread matching the oil drain port of the transformer bushing is provided on the inner wall of the apron body. Two observation windows are symmetrically provided on the side of the apron, and the observation windows extend from the sealed end of the apron body to the open end. Fins are fixedly provided on both sides of the observation window to facilitate the twisting of the sleeve connecting apron. A connecting hole is provided in the middle of the sealed end of the apron body, and the apron body is movably provided on the oil suction pipe through the connecting hole.

[0014] Preferably, an oil suction gun is also provided on the oil suction pipe, which is sealingly connected to one end of the oil suction pipe away from the connecting pipe, has a diameter larger than the connecting hole, and is sealingly plugged into the oil discharge port of the transformer bushing.

[0015] Preferably, it also includes a rubber gasket, which is sleeved on the oil suction pipe and located between the oil suction gun and the sleeve connection apron.

[0016] Preferably, the bottom of the shell is also provided with buffer support feet, and there are four buffer support feet, which are correspondingly arranged at the four corners of the bottom of the shell.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Aiming at the problems of low efficiency, complicated operation and poor environmental adaptability in the oil change process of transformer bushing, the present invention designs an efficient, convenient and safe oil change equipment. By adopting negative pressure oil suction pump technology, it effectively avoids the situation that waste oil cannot be completely discharged in the traditional gravity oil discharge method, greatly shortens the oil replacement time, does not need to disassemble the bushing, and reduces the power outage time of the transformer.

[0019] 2. The strong suction force of the negative pressure oil suction pump can completely discharge the waste oil and suck out the wasted oil on the wall of the bushing to avoid the mixing of new oil and waste oil, ensure the purity and performance stability of the newly injected oil, and extend the service life of the transformer bushing oil.

[0020] 3. The present invention optimizes the operation process and greatly improves the operation efficiency through the application of integrated design, display interaction module and quick disconnection device. At the same time, the equipped rubber gasket and sleeve connection apron significantly improve the sealing performance, effectively reduce oil leakage, and form a double protection against environmental pollution and operation risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 Side view of;

[0024] Figure 3 It is a schematic diagram of the structure inside the shell of the present invention.

[0025] Figure 4 For the present invention Figure 3 A top view of

[0026] Figure 5 It is a schematic diagram of the structure of the connecting apron in the present invention;

[0027] Figure 6 For the present invention Figure 5 Bottom view of

[0028] Figure 7 It is a schematic diagram of the overall structure of the shell in the present invention.

[0029] Figure numerals: 1. Shell; 101. Buffer support foot; 2. Display interaction module; 3. Pipe assembly; 301. Oil suction connecting pipe; 302. Oil discharge connecting pipe; 303. Quick disconnect device; 304. Oil suction pipe; 305. Oil discharge pipe; 306. Oil suction gun; 4. Casing connection apron; 401. Apron body; 402. Observation window; 403. Fin; 404. Connection hole; 405. Rubber gasket; 5. Oil pump body; 501. Oil suction port; 502. Oil outlet; 6. Micro control module; 7. DC power supply. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] like Figure 1-Figure 7As shown, a transformer bushing negative pressure oil suction pump includes a housing 1, a control component, a DC power supply 7, an oil pump body 5 and a pipeline component 3. The DC power supply 7 is used as a driving energy source and is electrically connected to the control system and the oil pump body 5. The control system is electrically connected to the oil pump body 5 to control the start and stop and the operating state of the oil pump body 5. The control component, the DC power supply 7 and the oil pump body 5 are compactly installed in the housing 1 to form an integrated design for easy carrying and operation. The pipeline component 3 passes through the housing 1 and is sealed and connected to the oil pump body 5. The oil suction pump effectively discharges waste oil from the bottom of the casing through negative pressure technology, avoiding the problem of residual oil caused by the traditional gravity oil discharge method, thereby ensuring the purity and performance stability of the oil after the new oil is injected. At the same time, in order to further improve the operating efficiency and safety, the oil pump body 5 of the present invention is designed with a multi-speed adjustable negative pressure suction output to adapt to the oil volume and oil discharge rate requirements of different types of transformer bushings. At the same time, a large suction mode is used to suck out the wall oil of the bushing, reduce the steps of cleaning the bushing, and improve the work efficiency of the staff. To ensure safe use in complex environments, the housing 1 is made of corrosion-resistant, waterproof and dustproof materials, which can effectively resist the influence of harsh environments such as humidity, dust, and chemical corrosion, and extend the service life of the device. The built-in DC power supply 7 not only has a long battery life, but also has overload protection and voltage stabilization functions, which can maintain the reliability of device operation in scenarios with large load fluctuations.

[0034] Compared with traditional manual oil drainage and gravity oil drainage methods, the transformer bushing negative pressure oil suction pump of the present invention can significantly shorten the time for transformer oil change, while reducing the need to disassemble the bushing and long-term power outage maintenance. This not only helps to restore the timeliness of power supply to users and reduce the impact on grid load distribution, but also reduces manpower input and equipment loss during the oil change process. Through the fully enclosed oil suction operation design, the risk of environmental pollution during oil replacement is greatly reduced, which meets environmental protection requirements and industry safety regulations. The present invention provides an efficient, safe and reliable solution for transformer maintenance operations, which has broad application prospects and significant practical value.

[0035] In a preferred embodiment, the control component includes a display interaction module 2, a micro control module 6 and a data acquisition module, wherein the data acquisition module is arranged on the oil pump body 5, and is used to monitor key parameters such as oil suction volume, negative pressure intensity, and operating temperature in real time, and transmit the collected data to the micro control module 6, and then the micro control module 6 transmits it to the interactive display module for display. The micro control module 6 is a core processing unit, which is electrically connected to the data acquisition module, responsible for receiving, processing and analyzing relevant data, and is also electrically connected to the display interaction module 2 to realize command input, operation status feedback and real-time display and recording of data. The display interaction module 2 adopts a high-definition digital display screen, has an intuitive and easy-to-use human-computer interaction interface, can dynamically display the operation status of the oil suction pump, including real-time negative pressure value, oil suction volume, current operation mode and other information, and supports touch or button operation, which is used to start and stop the device, adjust the negative pressure output intensity and set the alarm threshold and other functions. The micro control module 6 is also directly electrically connected to the oil pump body 5 to control its start and stop, operation speed and working state to ensure the efficiency and stability of the oil suction process.

[0036] In actual use, the data acquisition module can quickly respond to changes in oil volume and parameter fluctuations in the operating environment through high-sensitivity sensors and corrosion-resistant acquisition structures, ensuring the accuracy and reliability of data monitoring. When the oil suction pump is running, the micro-control module 6 adjusts the negative pressure suction in real time according to the information fed back by the data acquisition module to adapt to different oil viscosities, pipeline lengths and oil discharge speed requirements, avoiding problems such as damage to the casing structure or incomplete oil suction caused by excessive suction. At the same time, the amount of oil absorbed is recorded, and the required amount of oil injection is determined based on the data of the amount of oil absorbed. At the same time, the user interface design of the display interaction module 2 is simple and intuitive, which can clearly display the key data of the oil suction process, help operators to grasp the oil change situation in real time, and through the alarm prompt function, timely detect abnormalities, such as insufficient oil absorption, high negative pressure or excessive equipment temperature, thereby reducing operational risks.

[0037] In order to enhance the intelligence and ease of operation of the equipment, the micro control module 6 has an embedded intelligent algorithm that can automatically optimize the operation strategy during the oil suction process according to the structural characteristics, oil conditions and environmental parameters of different transformer bushings. For example, in high altitude and low temperature environments, the system will automatically increase the negative pressure suction to overcome the difficulty of oil discharge caused by increased oil viscosity; under high load operating conditions, the suction will be appropriately reduced to protect the bushing interface from excessive stress. Compared with traditional single mechanical operations, this system can achieve more precise, efficient and safer oil suction operations, ensure the thoroughness of the oil change process and the purity of the oil quality, while significantly shortening maintenance time and reducing the impact of power outages on users and power grids, further improving the adaptability and practical value of the equipment in different scenarios.

[0038] In a preferred embodiment, the pipeline assembly 3 includes a connecting pipe, an oil suction pipe 304 and an oil discharge pipe 305, wherein the connecting pipe is composed of an oil suction connecting pipe 301 and an oil discharge connecting pipe 302, which are respectively used to be sealed and connected with the oil suction port 501 and the oil discharge port 502 of the oil pump body 5. The oil suction port 501 of the oil pump body 5 is connected to the oil suction pipe 304 through the oil suction connecting pipe 301, and the oil discharge port 502 is connected to the oil discharge pipe 305 through the oil discharge connecting pipe 302, so as to ensure the airtightness and stability of the oil suction and discharge passages. The oil suction pipe 304 and the oil discharge pipe 305 pass through the oil suction pump housing 1 and are sealed and connected with the corresponding parts of the oil suction connecting pipe 301 and the oil discharge connecting pipe 302, forming a complete oil suction and discharge system.

[0039] In order to improve the adaptability of the connecting pipes, the oil suction connecting pipe 301 and the oil discharge connecting pipe 302 are equipped with quick connectors and sealing gaskets, which are convenient for operators to quickly disassemble and assemble in complex environments, and effectively prevent oil leakage at the connection. The lengths of the oil suction pipe 304 and the oil discharge pipe 305 can be customized according to the specific model of the transformer and the on-site environment to meet diverse operating requirements. By optimizing the design of the pipeline assembly 3, the present invention realizes efficient, safe and convenient waste oil discharge and new oil replacement operations. The sealed plug-in and deep oil discharge design of the oil suction pipe 304 ensure the thorough cleaning of the waste oil and improve the purity of the new oil after injection, thereby extending the service life of the transformer bushing oil; the overall structure is compact, easy to disassemble and assemble, and has strong adaptability, providing an efficient and practical solution for on-site maintenance operations.

[0040] In a preferred embodiment, the present invention further includes a sleeve connection apron 4, which is arranged on the oil suction pipe 304 and is used to achieve a sealed connection between the oil suction pipe 304 and the transformer bushing oil discharge port, thereby improving the safety and efficiency of the oil change operation. The sleeve connection apron 4 is designed in a variety of models to adapt to the transformer bushing oil discharge port interfaces of different sizes and structures, thereby enhancing the versatility and adaptability of the equipment. The sleeve connection apron 4 includes an apron body 401, which is a cylindrical sleeve with one end sealed, and is made of a high-performance material that is resistant to high temperature, oil, corrosion, and has a certain elasticity, so as to ensure stable performance during long-term use in harsh environments, and not age or deform due to the influence of oil or the external environment.

[0041] The inner wall of the apron body 401 is designed with a threaded structure that matches the oil drain port of the transformer bushing, and the apron is firmly fixed to the transformer bushing by a threaded connection. Two symmetrically distributed observation windows 402 are set on the side of the apron body 401, extending from the sealed end of the apron body 401 to the open end, covering the main part of the apron height. Through the observation window 402, the operator can clearly observe the connection status of the oil suction pipe 304 after inserting it into the bushing to see if there is any oil leakage. In order to further improve the convenience of operation of the apron, fins 403 structures are fixedly set on both sides of the observation window 402. The fins 403 adopt an anti-slip design, and the operator can easily tighten or loosen the apron by grasping or rotating the fins 403, which can ensure operability even in oily or humid environments. A connecting hole 404 is set in the middle of the sealed end of the apron body 401, and the connecting hole 404 is used to movably set the apron body 401 on the oil suction pipe 304. The movable design of the connection hole 404 allows the apron to adjust its position within a certain range, ensuring that it can accurately dock with the casing oil discharge port, adapt to the oil discharge port structure at different angles or heights, and also facilitate the disassembly and maintenance of the oil suction pipe 304. The apron body 401 is provided with a fixing part, which is two semicircular blocks. The two semicircular blocks are supported on both sides of the connection hole 404 to fix the position of the oil suction pipe 304 and prevent the apron body 401 from tilting when fixing the oil suction pipe 304, thereby preventing oil leakage.

[0042] In a preferred embodiment, an oil suction gun 306 is provided at one end of the oil suction pipe 304 away from the connecting pipe. The oil suction gun 306 is tightly combined with the oil suction pipe 304 by means of a sealed connection. The diameter of the oil suction gun 306 is larger than the connecting hole 404 of the bushing connecting apron 4, which can achieve efficient and flexible sealing connection and ensure that the oil suction gun 306 can accurately connect to the oil discharge port of the transformer bushing.

[0043] In order to further improve the sealing performance and operational stability between the oil suction gun 306 and the sleeve connection apron 4 and the oil discharge port, a rubber gasket 405 is added to the sleeve connection apron 4. The rubber gasket 405 is sleeved between the oil suction gun 306 and the sleeve connection apron 4. The rubber gasket 405 is made of highly elastic, highly oil-resistant and corrosion-resistant materials (such as fluororubber or silicone rubber), and has excellent sealing performance and environmental adaptability. When the sleeve connection apron 4 is connected to the oil discharge port of the sleeve, it can seal the oil discharge port and effectively prevent oil leakage. At the same time, it absorbs the deformation error during the connection process to ensure that the sleeve interfaces of different sizes can achieve stable sealing. In addition, the rubber gasket 405 has an excellent buffering function, which can absorb the vibration and impact force generated during the plugging process of the oil suction gun 306, and avoid damage to the sleeve interface or the oil suction gun 306 itself due to excessive mechanical stress. The elasticity and flexibility of the gasket enable it to adapt to different environmental conditions, such as maintaining stable performance under high load, high humidity or low temperature environments, thereby extending the service life of the equipment.

[0044] In a preferred embodiment, a quick disconnect device 303 is designed at the connection between the oil suction connection pipe 301 and the oil discharge connection pipe 302 and the oil suction pipe 304 and the oil discharge pipe 305, which can realize the rapid assembly and disassembly of the oil suction and discharge circuits and the connection pipes, greatly improving the operating efficiency and the convenience of system maintenance. The structure includes a snap-on interface and an embedded sealing gasket, which can ensure the sealing and stability of the connection under high negative pressure operation and effectively prevent oil leakage.

[0045] In a preferred embodiment, four buffer support feet 101 are provided at the bottom of the housing 1, corresponding to the four corners of the bottom of the housing 1, respectively, to improve the stability of the device, protect the housing 1 from external impact, and reduce the vibration of the device during transportation and operation. The buffer support feet 101 are made of high-strength, corrosion-resistant synthetic materials (such as engineering plastics or rubber composite materials wrapped in the metal housing 1), and each buffer support foot 101 is embedded with a rubber pad with shock-absorbing performance, which can effectively absorb ground impact and vibration during operation, and reduce mechanical damage to internal components of the device.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A transformer bushing negative pressure oil suction pump, characterized in that: The invention comprises a housing (1), a control component, a DC power supply (7), an oil pump body (5) and a pipeline component (3); the DC power supply (7) is electrically connected to the control component and the oil pump body (5); the control system is electrically connected to the oil pump body (5) to control the oil pump body (5); the control component, the DC power supply (7) and the oil pump body (5) are installed in the housing (1); the pipeline component (3) passes through the housing (1) and is sealedly connected to the oil pump body (5) and is used for being plugged into the oil discharge port of the transformer bushing.

2. A transformer bushing negative pressure oil suction pump according to claim 1, characterized in that: The control component comprises a display interaction module (2), a micro control module (6) and a data acquisition module. The data acquisition module is arranged on the oil pump body (5). The data acquisition module is electrically connected to the micro control module (6). The display interaction module (2) is electrically connected to the micro control module (6) to implement command input and data display. The micro control module (6) is electrically connected to the oil pump body (5) to control the start and stop of the oil pump body (5).

3. A transformer bushing negative pressure oil suction pump according to claim 1, characterized in that: The pipeline assembly (3) comprises a connecting pipe, an oil suction pipe (304) and an oil discharge pipe (305); the connecting pipe comprises an oil suction connecting pipe (301) and an oil discharge connecting pipe (302); the oil pump body (5) is provided with an oil suction port (501) and an oil discharge port (502); the oil suction connecting pipe (301) is sealedly connected to the oil suction port (501) of the oil pump body (5); the oil discharge connecting pipe (302) is sealedly connected to the oil discharge port (502) of the oil pump body (5); the oil suction connecting pipe (301) passes through the housing (1) and is sealedly connected to the oil suction pipe (304); the oil discharge connecting pipe (302) passes through the housing (1) and is sealedly connected to the oil discharge pipe (305); the oil suction pipe (304) is sealedly plugged into the oil discharge port of the transformer bushing.

4. A transformer bushing negative pressure oil suction pump according to claim 3, characterized in that: It also comprises a casing connection apron (4), wherein the casing connection apron (4) is arranged on the oil suction pipe (304).

5. The transformer bushing negative pressure oil suction pump according to claim 3, characterized in that: The oil suction connecting pipe (301) and the oil discharge connecting pipe (302) are provided with a quick disconnecting device (303) so as to quickly disconnect the oil suction pipe (304) and the oil discharge pipe (305).

6. A transformer bushing negative pressure oil suction pump according to claim 4, characterized in that: The bushing connection apron (4) has multiple models to correspond to the connection of transformer bushings of different sizes.

7. The transformer bushing negative pressure oil suction pump according to claim 4, characterized in that: The sleeve connecting apron (4) comprises an apron body (401), which is a cylindrical sleeve with one end sealed. A thread matching the oil discharge port of the transformer bushing is arranged on the inner wall of the apron body (401), and two observation windows (402) are symmetrically arranged on the side of the apron. The observation windows (402) extend from the sealed end of the apron body (401) to the open end. Fins (403) are fixedly arranged on both sides of the observation windows (402) to facilitate the twisting of the sleeve connecting apron (4). A connecting hole (404) is arranged in the middle of the sealed end of the apron body (401), and the apron body (401) is movably arranged on the oil suction pipe (304) through the connecting hole (404).

8. The transformer bushing negative pressure oil suction pump according to claim 7, characterized in that: The oil suction pipe (304) is also provided with an oil suction gun (306), the oil suction gun (306) is sealingly connected to one end of the oil suction pipe (304) away from the connecting pipe, the diameter of the oil suction gun (306) is larger than the connecting hole (404), and the oil suction gun (306) is sealingly plugged into the oil discharge port of the transformer bushing.

9. A transformer bushing negative pressure oil suction pump according to claim 8, characterized in that: It also includes a rubber gasket (405), which is sleeved on the oil suction pipe (304) and located between the oil suction gun (306) and the sleeve connection apron (4).

10. The transformer bushing negative pressure oil suction pump according to claim 1, characterized in that: The bottom of the shell (1) is also provided with buffer support feet (101), and there are four buffer support feet (101), which are correspondingly provided at the four corners of the bottom of the shell (1).

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