Weak current engineering voltage transformation power supply device with high safety

Abstract

The invention relates to the technical field of weak current engineering, and discloses a high-safety weak current engineering voltage transformation power supply device which comprises a voltage transformation box body, an upper independent space and a lower independent space are formed through a designed top plate and a designed bottom plate, a transformer body and an oil conservator are effectively isolated, the risks of oil leakage and fire disasters are reduced, the safety of the whole device is improved, and the safety of the whole device is improved. A conveying pipe, a liquid outlet pipe and a concentration pipe are designed to form a closed insulating oil circulation system, the conveying pipe is responsible for enabling insulating oil conveyed to the top space of the transformer from an oil conservator to submerge a transformer body from bottom to top, and the liquid outlet pipe guides the oil to the concentration pipe from the top of the transformer. The circulating flow ensures the uniform distribution of oil in the transformer and is beneficial to maintaining constant temperature, so that the cooling efficiency is improved, the transformer can be prevented from being overheated through effective cooling, and the service life of the transformer is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of weak current engineering, and particularly to a variable voltage power supply device for weak current engineering with high safety. Background Technique

[0002] The variable voltage power supply system for weak current engineering is a power supply device that provides a stable and appropriate voltage level. Such devices usually include components such as transformers, voltage regulators, distribution panels, protection devices, and related control circuits. The transformer is the core part of the variable voltage power supply device. It can convert the input high-voltage electricity into low-voltage electricity as needed, or raise or lower the voltage to meet the voltage requirements of different weak current devices;

[0003] However, the isolation measures between the existing transformer and the oil conservator are insufficient, and oil leakage is likely to occur. Oil leakage not only causes waste of oil, but may also trigger a fire, increasing the safety risk during use. Due to the direct contact between the transformer body and the oil conservator, once a fault occurs inside the transformer, it may quickly spread to the oil conservator, increasing the severity of the accident. Secondly, the problem of cooling efficiency is caused by the insufficient oil circulation path in the traditional design and the simplification of the cooling system design. These problems make the oil circulate unevenly inside the transformer, easily forming hot spots. This not only affects the cooling efficiency of the transformer, but may also damage its insulation performance, thereby shortening the service life of the equipment and increasing the maintenance cost. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a variable voltage power supply device for weak current engineering with high safety. The present invention forms two independent upper and lower spaces through the designed top plate and bottom plate, effectively isolating the transformer body from the oil conservator, reducing the risk of oil leakage and fire, and improving the safety of the overall device. The designed delivery pipe, liquid outlet pipe, and central pipe form a closed insulating oil circulation system. The delivery pipe is responsible for submerging the transformer body from bottom to top with the insulating oil transported from the oil conservator to the top space of the transformer, and the liquid outlet pipe guides the oil from the top of the transformer to the central pipe. This circulating flow ensures the uniform distribution of the oil inside the transformer, helps maintain a constant temperature, thereby improving the cooling efficiency. Effective cooling can prevent the transformer from overheating and extend its service life.

[0006] (2) Technical Solutions

[0007] To solve the above technical problems, the present invention provides the following technical solution: A variable voltage power supply device for a weak current project with high safety, including a variable voltage box body. Inside the top of the variable voltage box body, there is a slidable top cover. At the rear inside of the top cover, there is a fixed high-voltage bushing. At the front inside of the top cover, there is a fixed low-voltage bushing. At the outer sides below the high-voltage bushing and the low-voltage bushing, there is a fixed top plate. At the bottom of the top plate, there is a fixed transformer body. The top of the transformer body is respectively connected to the bottoms of the high-voltage bushing and the low-voltage bushing. At the four corner positions above the inner side of the variable voltage box body, there are fixed clamping plates. The tops of the clamping plates are in contact with the four corner positions at the bottom of the top plate. At the bottom inside the variable voltage box body, there is a fixed bottom plate. Inside the bottom plate, there is a through hole. In the middle of the bottom of the variable voltage box body, there is a drain valve;

[0008] On the right side of the top of the top cover, there is a fixed oil conservator. In the middle at the top right end of the top cover, there is a fixed oil pump. The bottom of the oil conservator is connected to the input end of the oil pump. The output end of the oil pump extends deep into the upper right position inside the variable voltage box body. On the left end face, the front end face, and the right end face of the variable voltage box body, there are all fixed conveying pipes. Above the rear end face of the variable voltage box body, there is a fixed liquid outlet pipe. The end of the liquid outlet pipe away from the variable voltage box body is fixed to a collecting pipe. In the middle of the rear end face of the collecting pipe, there is a fixed inlet valve. At the top right end of the collecting pipe, there is an external thread structure. The outside of the external thread structure is threadedly connected to an internal thread structure. The outside of the internal thread structure is fixed to a filter cylinder. In the middle at the top right end of the filter cylinder, there is a fixed connecting pipe. The end of the connecting pipe away from the filter cylinder is connected to the input end on the right side of the oil conservator;

[0009] In the middle of the inside of the filter cylinder, there is a fixed first fixing ring. Inside the first fixing ring, there is a fixed stainless steel woven mesh. On the right side inside the filter cylinder, there is a fixed second fixing ring. Inside the second fixing ring, there is a fixed stainless steel microporous filter screen.

[0010] Preferably, the liquid flowing inside the variable voltage box body is insulating oil. There are space layers between the top of the top plate and the top end above the inner side of the variable voltage box body, and between the bottom of the bottom plate and the bottom end below the inner side of the variable voltage box body. And the height of the space layer is twice the diameter of the cross-section of the conveying pipe. The upper and lower ends of the conveying pipe communicate with the space layer above the inner side of the variable voltage box body and the space layer below the inner side of the variable voltage box body. The top plate and the bottom plate in the variable voltage box body form two independent upper and lower spaces, effectively isolating the transformer body from the oil conservator, reducing the risk of oil leakage and fire, and improving the safety of the overall device.

[0011] Preferably, the overall shape of the delivery pipe is C-shaped, and the arrangement direction of the delivery pipes is horizontally and evenly arranged on the left end face, the front end face, and the right end face of the transformer pressure box. The distance between the delivery pipes is 15 cm. The delivery pipes are responsible for submerging the transformer body from bottom to top with the insulating oil transported from the oil conservator to the top space of the transformer. The liquid outlet pipe then guides the oil from the top of the transformer to the central pipe. This circulating flow ensures the uniform distribution of the oil inside the transformer and helps maintain a constant temperature.

[0012] Preferably, the number of through holes inside the bottom plate is several, and the diameter of each through hole is 10 cm. The thickness and area of the bottom plate match those of the top plate, and the area of the bottom plate and the top plate is the same as the area of the inner bottom of the transformer pressure box, allowing the insulating oil to submerge the transformer body from bottom to top and discharging the insulating oil exceeding the transformer body from the liquid outlet pipe out of the transformer pressure box to achieve the purpose of insulating oil flow.

[0013] Preferably, pipes are provided between the input end of the oil pump and the bottom of the oil conservator and at the output end of the oil pump. The pipe provided at the output end of the oil pump penetrates through the inside of the top cover and is in the space layer between the upper side of the inner side of the transformer pressure box and the top of the top plate. The oil pump can make the insulating oil inside the transformer pressure box flow, preventing the insulating oil from forming sediments due to long-term stillness.

[0014] Preferably, a number of holes are evenly arranged from left to right above the rear end face of the transformer pressure box, and the diameter of the holes matches the cross-sectional diameter of the liquid outlet pipe. The position of the holes opened above the rear end face of the transformer pressure box is 2 cm below the bottom of the bottom plate, allowing the insulating oil to flow out of the transformer pressure box while covering the transformer body.

[0015] Preferably, the top end of the drain valve is connected to the middle of the lower part inside the transformer pressure box, and the drain valve is a one-way valve. The top end of the front side of the inlet valve is connected to the middle of the rear part inside the central pipe, and the inlet valve is a two-way valve, providing a quick and simple method to replace the insulating oil inside the transformer pressure box, reducing the time and labor costs required for maintenance, and also reducing the risk of equipment damage caused by improper operation.

[0016] Preferably, the width, pitch, and inner diameter of the internal thread structure at the top end on the left side inside the filter cartridge match the width, pitch, and outer diameter of the external thread structure at the top end on the right side of the central pipe, and the number of thread turns of the internal thread structure and the external thread structure is greater than 3. By setting the external thread structure and the internal thread structure between the filter cartridge and the central pipe, daily maintenance and troubleshooting are made simpler and faster.

[0017] Preferably, the stainless steel braided mesh inside the first fixing ring and the stainless steel microporous filter mesh inside the second fixing ring are both circular in shape, and the stainless steel braided mesh is located on the left side of the stainless steel microporous filter mesh. The stainless steel braided mesh has a mesh number of 70, and the stainless steel microporous filter mesh has a mesh number of 400. As the first layer of filtration, the stainless steel braided mesh can capture larger particles and impurities, protecting the subsequent microporous filter mesh. The stainless steel microporous filter mesh, as the second layer of filtration, is responsible for removing smaller particles and fine impurities, ensuring the purity of the insulating oil, effectively preventing impurities from entering the inside of the oil pump, significantly reducing the wear of the oil pump, extending the service life of the oil pump, and reducing the maintenance frequency and replacement cost.

[0018] Compared with the prior art, the present invention provides a low-voltage engineering variable voltage power supply device with high safety, having the following beneficial effects:

[0019] 1. Compared with the prior art, through the designed top plate and bottom plate, the present invention forms two independent upper and lower spaces, effectively isolating the transformer body from the oil conservator, reducing the risk of oil leakage and fire, and improving the safety of the overall device. The designed delivery pipe, liquid outlet pipe, and central pipe form a closed insulating oil circulation system. The delivery pipe is responsible for submerging the transformer body from bottom to top with the insulating oil transported from the oil conservator to the top space of the transformer, and the liquid outlet pipe guides the oil from the top of the transformer to the central pipe. This circulating flow ensures the uniform distribution of the oil inside the transformer, helps maintain a constant temperature, thereby improving the cooling efficiency. Effective cooling can prevent the transformer from overheating and extend its service life. The design of the circulation system also takes into account the convenience of maintenance. By setting an external thread structure and an internal thread structure between the filter cartridge and the central pipe, daily maintenance and fault troubleshooting are made simpler and faster.

[0020] 2. Compared with the prior art, through the designed drain valve and inlet valve, the present invention provides a quick and simple method for replacing the insulating oil in the transformer box. When performing transformer maintenance or replacing the insulating oil, the operator can easily open the drain valve to quickly drain the oil and inject new insulating oil into the oil conservator through the inlet valve, reducing the time and labor costs required for maintenance. At the same time, it also reduces the risk of equipment damage caused by improper operation. In addition, the convenience of the drain valve also means that maintenance can be carried out without power interruption, improving the reliability of the system.

[0021] 3. Compared with the prior art, through the designed stainless - steel woven mesh and stainless - steel microporous filter screen in the present invention, hierarchical filtration can be carried out. The stainless - steel woven mesh serves as the first - layer filter, capable of capturing larger particles and impurities, protecting the subsequent microporous filter screen. The stainless - steel microporous filter screen serves as the second - layer filter, responsible for removing smaller particles and fine impurities. This hierarchical filtration strategy greatly improves the filtration efficiency, ensures the purity of the insulating oil, effectively prevents impurities from entering the inside of the oil pump, significantly reduces the wear of the oil pump, extends the service life of the oil pump, and reduces the maintenance frequency and replacement cost. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 is a schematic diagram of the transverse rotation of the transformer box of the present invention by 90° and the longitudinal sectional structure;

[0024] Figure 3 is a schematic diagram of the overall transverse rotation of the present invention by 180°;

[0025] Figure 4 is a schematic diagram of the partial explosion structure of the central pipe and the filter cartridge of the present invention;

[0026] Figure 5 is a schematic diagram of the longitudinal sectional structure of the filter cartridge of the present invention;

[0027] Figure 6 is a schematic diagram of the overall structure of the transformer box of the present invention;

[0028] Figure 7 is a schematic diagram of the overall longitudinal flip of the present invention by 180°.

[0029] Wherein: 1. Transformer box; 101. Top cover; 102. High - voltage bushing; 103. Low - voltage bushing; 104. Top plate; 105. Transformer body; 106. Bottom plate; 107. Through - hole; 108. Clamping plate; 109. Drain valve; 2. Conservator; 201. Delivery pipe; 202. Filter cartridge; 203. Connecting pipe; 204. Oil pump; 205. Outlet pipe; 206. Central pipe; 207. Inlet valve; 208. External thread structure; 209. Internal thread structure; 3. First fixing ring; 301. Stainless - steel woven mesh; 302. Second fixing ring; 303. Stainless - steel microporous filter screen. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1:

[0032] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 6 as shown in:

[0033] A low-voltage engineering variable voltage power supply device with high safety, including a variable voltage box body 1. Inside the top of the variable voltage box body 1, a slidable top cover 101 is provided. Inside the rear of the top cover 101, a high-voltage bushing 102 is provided. Inside the front of the top cover 101, a low-voltage bushing 103 is provided. The outer sides below the high-voltage bushing 102 and the low-voltage bushing 103 penetrate through the inside of the top plate 104 and are fixed. The bottom of the top plate 104 is welded with a transformer body 105. The top of the transformer body 105 is respectively connected to the bottoms of the high-voltage bushing 102 and the low-voltage bushing 103. At the four corner positions above the inner side of the variable voltage box body 1, clamping plates 108 are welded. The tops of the clamping plates 108 are in contact with the four corner positions at the bottom of the top plate 104. Inside the lower part of the variable voltage box body 1, a bottom plate 106 is welded. A through hole 107 is opened inside the bottom plate 106;

[0034] On the right side of the top of the top cover 101, an oil conservator 2 is welded. In the middle at the top right end of the top cover 101, an oil pump 204 is fixed by bolts. The bottom of the oil conservator 2 is connected to the input end of the oil pump 204. The output end of the oil pump 204 extends deep into the upper right position inside the variable voltage box body 1. The left end face, the front end face, and the right end face of the variable voltage box body 1 are all inserted and welded fixed by the top ends of the conveying pipes 201. Above the rear end face of the variable voltage box body 1, a liquid outlet pipe 205 is inserted and fixed. The end of the liquid outlet pipe 205 away from the variable voltage box body 1 is inserted into the upper part inside a centralized pipe 206 and welded fixed. An external thread structure 208 is provided at the top right end of the centralized pipe 206. The outside of the external thread structure 208 is inserted into the inside of an internal thread structure 209 and spiraled. A filter cylinder 202 is welded on the outside of the internal thread structure 209. In the middle at the top right end of the filter cylinder 202, a connecting pipe 203 is fixed by a flange. The end of the connecting pipe 203 away from the filter cylinder 202 is fixed to the input end on the right side of the oil conservator 2.

[0035] In an alternative embodiment: The liquid flowing inside the transformer housing 1 is insulating oil. There are space layers both between the top of the top plate 104 and the upper end of the inner side of the transformer housing 1, and between the bottom of the bottom plate 106 and the lower end of the inner side of the transformer housing 1. The height of the space layer is twice the diameter of the cross-section of the delivery pipe 201. The upper and lower ends of the delivery pipe 201 communicate with the space layer above the inner side of the transformer housing 1 and the space layer below the inner side of the transformer housing 1 respectively.

[0036] In this embodiment: The top plate 104 and the bottom plate 106 in the transformer housing 1 form two independent upper and lower spaces, effectively isolating the transformer body 105 from the oil conservator 2, reducing the risk of oil leakage and fire, and improving the safety of the overall device.

[0037] In an alternative embodiment: The overall shape of the delivery pipe 201 is C-shaped. The arrangement direction of the delivery pipe 201 is horizontally and evenly arranged on the left end face, the front end face, and the right end face of the transformer housing 1, and the distance between the delivery pipes 201 is 15 cm.

[0038] In this embodiment: The delivery pipe 201 is responsible for submerging the transformer body 105 from bottom to top with the insulating oil transported from the oil conservator 2 to the top space of the transformer, while the liquid discharge pipe 205 guides the oil from the top of the transformer to the collecting pipe 206. This circulating flow ensures the uniform distribution of the oil inside the transformer and helps maintain a constant temperature.

[0039] In an alternative embodiment: The number of through holes 107 inside the bottom plate 106 is several, and the diameter of each through hole 107 is 10 cm. The thickness and area of the bottom plate 106 match those of the top plate 104, and the area of the bottom plate 106 and the top plate 104 is the same as the area of the inner bottom of the transformer housing 1.

[0040] In this embodiment: It can submerge the transformer body 105 with insulating oil from bottom to top, and discharge the insulating oil exceeding the transformer body 105 from the liquid discharge pipe 205 out of the transformer housing 1 to achieve the purpose of the flow of insulating oil.

[0041] In an alternative embodiment: Pipes are provided both between the input end of the oil pump 204 and the bottom of the oil conservator 2 and at the output end of the oil pump 204. The pipe provided at the output end of the oil pump 204 penetrates inside the top cover 101 and is in the space layer between the upper side of the inner side of the transformer housing 1 and the top of the top plate 104.

[0042] In this embodiment: The oil pump 204 can make the insulating oil inside the transformer housing 1 flow, avoiding the formation of sediments due to the long-term stillness of the insulating oil.

[0043] In an alternative embodiment: A number of holes are provided above the rear end face of the transformer casing 1, which are evenly arranged from left to right. The caliber of the holes matches the cross-sectional diameter of the liquid outlet pipe 205. The positions of the holes provided above the rear end face of the transformer casing 1 are located 2 cm below the bottom of the bottom plate 106.

[0044] In this embodiment: The insulating oil can flow out of the transformer casing 1 while covering the transformer body 105.

[0045] Embodiment Two:

[0046] Please refer to Figure 3 and Figure 7 as shown:

[0047] A drain valve 109 is provided in the middle of the bottom of the transformer casing 1, and a liquid inlet valve 207 is provided in the middle of the rear end face of the concentrator pipe 206. The top of the drain valve 109 is connected to the middle of the lower part inside the transformer casing 1, and the drain valve 109 is a one-way valve. The front top of the liquid inlet valve 207 is connected to the middle of the rear part inside the concentrator pipe 206, and the liquid inlet valve 207 is a two-way valve.

[0048] In this embodiment: A quick and simple method is provided to replace the insulating oil in the transformer casing 1, reducing the time and labor costs required for maintenance. At the same time, it also reduces the risk of equipment damage caused by improper operation.

[0049] Embodiment Three:

[0050] Please refer to Figures 3 to 5 as shown:

[0051] A first fixing ring 3 is welded in the middle of the inside of the filter cartridge 202. A stainless steel woven mesh 301 is welded inside the first fixing ring 3. A second fixing ring 302 is welded on the right side inside the filter cartridge 202. A stainless steel microporous filter screen 303 is welded inside the second fixing ring 302.

[0052] In an alternative embodiment: The shapes of the stainless steel woven mesh 301 inside the first fixing ring 3 and the stainless steel microporous filter screen 303 inside the second fixing ring 302 are both circular. The stainless steel woven mesh 301 is located on the left side of the stainless steel microporous filter screen 303. The mesh number of the stainless steel woven mesh 301 is 70 meshes, and the mesh number of the stainless steel microporous filter screen 303 is 400 meshes.

[0053] In this embodiment: The stainless steel woven mesh 301 serves as the first layer of filtration, capable of capturing larger particles and impurities, protecting the subsequent microporous filter screen. The stainless steel microporous filter screen 303 serves as the second layer of filtration, responsible for removing smaller particles and fine impurities, ensuring the purity of the insulating oil, effectively preventing impurities from entering the inside of the oil pump 204, significantly reducing the wear of the oil pump 204, extending the service life of the oil pump 204, and reducing the maintenance frequency and replacement cost.

[0054] Working principle:

[0055] During installation: Take out the filter cartridge 202, align the end of the filter cartridge 202 with the internal thread structure 209 with the right top end of the central pipe 206 at the rear of the transformer pressure box 1 and rotate. The internal thread structure 209 spirals with the external thread structure 208 at the right top end of the central pipe 206 until it is tightened. Then connect the connecting pipe 203 at the rear top of the oil conservator 2 to the middle of the right end face of the filter cartridge 202;

[0056] During use: Insert the transformer body 105 into the inside of the transformer pressure box 1 from top to bottom until the four corners at the bottom of the top plate 104 at the top of the transformer body 105 contact the clamping plates 108 at the four corners of the inner wall of the transformer pressure box 1. At this time, the top cover 101 on the top of the clamping plate 108 also caps the transformer pressure box 1. Connect the cable to the high-voltage bushing 102 or the low-voltage bushing 103 according to requirements. Then inject insulating oil into the transformer pressure box 1. The operator connects the pipeline for transporting insulating oil to the liquid inlet valve 207 at the rear end face of the transformer pressure box 1. After the insulating oil enters the central pipe 206, it flows into the oil conservator 2 along the filter cartridge 202 and the connecting pipe 203 at the right top end of the central pipe 206. Open the oil pump 204 at the right top of the top cover 101. The oil pump 204 pumps out the insulating oil in the oil conservator 2 and injects it into the space layer between the inner top of the transformer pressure box 1 and the top of the top plate 104. After the insulating oil is in the space layer, it is transported to the lower part inside the transformer pressure box 1 by the conveying pipes 201 on the left end face, the front end face and the right end face of the transformer pressure box 1. The insulating oil accumulates at the lower part inside the transformer pressure box 1, and as the subsequent insulating oil is injected, the water level rises upward, passes through the through hole 107 inside the bottom plate 106, and covers the transformer body 105. When the water level of the insulating oil reaches the height of the liquid outlet pipe 205 at the rear end face of the transformer pressure box 1, the insulating oil is discharged from the liquid outlet pipe 205 and re-enters the central pipe 206. At this time, the operator can disconnect the pipeline for injecting insulating oil into the central pipe 206 and close the liquid inlet valve 207. The oil pump 204 drives the insulating oil inside the transformer pressure box 1 to circulate. The stainless steel woven mesh 301 arranged inside the first fixing ring 3 and the stainless steel microporous filter screen 303 arranged inside the second fixing ring 302 in the filter cartridge 202 effectively prevent impurities from entering the inside of the oil pump 204, significantly reduce the wear of the oil pump 204, extend the service life of the oil pump 204, and reduce the maintenance frequency and replacement cost;

[0057] When the insulating oil needs to be replaced after a period of use: Place containers at the bottom of the liquid inlet valve 207 and directly below the transformer housing 1 at the same time. Open the liquid inlet valve 207 and the drain valve 109 in the middle of the bottom of the transformer housing 1. The liquid inlet valve 207 is used to empty the insulating oil in the manifold 206, while the drain valve 109 is used to empty the insulating oil in the transformer housing 1. During the emptying process, water can be injected into the manifold 206 through the liquid inlet valve 207. Through the above operations of the insulating oil flow, the structures through which the insulating oil flows are cleaned, and the impurities can follow the water and be discharged out by opening the drain valve 109, reducing the time and labor costs required for maintenance. At the same time, the risk of equipment damage caused by improper operation is also reduced.

[0058] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-voltage power supply device with high safety, comprising a transformer box (1), characterized in that: A slidable top cover (101) is provided on the inner side of the top of the transformer box (1); a high-voltage bushing (102) is fixedly connected to the rear of the top cover (101); a low-voltage bushing (103) is fixedly connected to the front of the top cover (101); a top plate (104) is fixedly connected to the outer sides below the high-voltage bushing (102) and the low-voltage bushing (103); a transformer body (105) is fixedly connected to the bottom of the top plate (104); and the top of the transformer body (105) is fixedly connected to the top of the transformer body (105). The parts are respectively connected to the bottom of the high-voltage bushing (102) and the low-voltage bushing (103); a clamping plate (108) is fixedly connected at the four corners of the upper inner side of the transformer housing (1); the top of the clamping plate (108) contacts the four corners of the bottom of the top plate (104); a bottom plate (106) is fixedly connected to the lower inner side of the transformer housing (1); a through hole (107) is provided inside the bottom plate (106); and a drain valve (109) is provided in the middle of the bottom of the transformer housing (1); The top right side of the top cover (101) is fixedly connected to an oil pillow (2), the middle of the top right side of the top cover (101) is fixedly connected to an oil pump (204), the bottom of the oil pillow (2) is connected to the input end of the oil pump (204), the output end of the oil pump (204) extends deep into the upper right side of the transformer box (1), the left end face, the front end face and the right end face of the transformer box (1) are all fixedly connected to a delivery pipe (201), the upper rear end face of the transformer box (1) is fixedly connected to a liquid outlet pipe (205), and the end of the liquid outlet pipe (205) away from the transformer box (1) is fixedly connected to the transformer box (1). A centralizing pipe (206) is connected, a liquid inlet valve (207) is fixedly connected in the middle of the rear end face of the centralizing pipe (206), an external thread structure (208) is fixedly connected in the top right side of the centralizing pipe (206), an internal thread structure (209) is threadedly connected in the outer side of the external thread structure (208), a filter cartridge (202) is fixedly connected in the outer side of the internal thread structure (209), a connecting pipe (203) is fixedly connected in the middle of the top right side of the filter cartridge (202), and one end of the connecting pipe (203) away from the filter cartridge (202) is fixedly connected to the right input end of the oil pillow (2); A first fixing ring (3) is fixedly connected in the middle of the filter cartridge (202), a stainless steel braided mesh (301) is fixedly connected inside the first fixing ring (3), a second fixing ring (302) is fixedly connected on the right side of the filter cartridge (202), and a stainless steel microporous filter mesh (303) is fixedly connected inside the second fixing ring (302).

2. According to claim 1, a highly safe weak current engineering transformer power supply device is characterized by: The liquid circulating in the transformer box (1) is insulating oil. A space layer is provided between the top of the top plate (104) and the top of the inner side of the transformer box (1), and between the bottom of the bottom plate (106) and the bottom of the inner side of the transformer box (1). The height of the space layer is twice the diameter of the cross section of the delivery pipe (201). The upper and lower ends of the delivery pipe (201) are both in communication with the space layer on the inner side of the transformer box (1) and the space layer on the inner side of the transformer box (1).

3. According to the highly safe weak current engineering transformer power supply device of claim 1, it is characterized by: The overall shape of the delivery pipe (201) is C-shaped, and the delivery pipe (201) is arranged in a direction that is evenly arranged laterally on the left end face, the front end face and the right end face of the transformer box (1), and the distance between the delivery pipes (201) is 15 cm.

4. According to the highly safe weak current engineering transformer power supply device of claim 1, it is characterized by: The number of through holes (107) inside the bottom plate (106) is several, and the diameter of the through holes (107) is 10 cm. The thickness and area of ​​the bottom plate (106) match the thickness and area of ​​the top plate (104), and the areas of the bottom plate (106) and the top plate (104) are consistent with the area of ​​the bottom inside the transformer box (1).

5. According to the highly safe weak current engineering transformer power supply device of claim 1, it is characterized by: Pipes are provided between the input end of the oil pump (204) and the bottom of the oil pillow (2), as well as at the output end of the oil pump (204), and the pipe provided at the output end of the oil pump (204) passes through the interior of the top cover (101) and is located in the space layer between the upper inner side of the transformer box (1) and the top of the top plate (104).

6. The highly safe weak current engineering transformer power supply device according to claim 1, characterized in that: A plurality of holes evenly arranged from left to right are provided above the rear end surface of the transformer housing (1), and the diameter of the holes matches the cross-sectional diameter of the liquid outlet pipe (205). The holes provided above the rear end surface of the transformer housing (1) are located 2 cm below the bottom of the bottom plate (106).

7. The highly safe weak current engineering transformer power supply device according to claim 1, characterized in that: The top end of the drain valve (109) is connected to the middle of the lower part of the transformer housing (1), and the drain valve (109) is a one-way valve. The front top end of the inlet valve (207) is connected to the middle of the rear part of the central pipe (206), and the inlet valve (207) is a two-way valve.

8. The highly safe weak current engineering transformer power supply device according to claim 1, characterized in that: The width, pitch and inner diameter of the internal thread structure (209) at the top of the left side of the filter cartridge (202) match the width, pitch and outer diameter of the external thread structure (208) at the top of the right side of the central tube (206), and the number of thread turns of the internal thread structure (209) and the external thread structure (208) is greater than 3.

9. The highly safe weak current engineering transformer power supply device according to claim 1, characterized in that: The stainless steel woven mesh (301) on the inner side of the first fixing ring (3) and the stainless steel microporous filter (303) on the inner side of the second fixing ring (302) are both circular in shape, and the stainless steel woven mesh (301) is located on the left side of the stainless steel microporous filter (303). The mesh number of the stainless steel woven mesh (301) is 70 meshes, and the mesh number of the stainless steel microporous filter (303) is 400 meshes.

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