A nitrogen fire extinguishing protection device for oil-immersed transformers
By introducing a turbine and stirring blade structure into the oil-immersed transformer and optimizing the nitrogen flow path, the problem of poor oil fluidity was solved, resulting in a more efficient nitrogen cooling effect and improved fire extinguishing and protection capabilities.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU LIANBIAN ELECTRIC CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-02
AI Technical Summary
The nitrogen fire extinguishing system in existing oil-immersed transformers lacks a stirring structure, resulting in low oil fluidity and poor heat exchange between low-temperature nitrogen and the oil.
A nitrogen fire extinguishing protection device for oil-immersed transformers was designed. By installing a turbine and stirring blades inside the transformer, the rotation of the turbine drives the stirring blades to stir the oil, improving the oil's fluidity. The flow direction of nitrogen is optimized by a diverter plate and a guide pipe, enhancing the cooling effect of nitrogen.
It improves the fluidity of the oil and the cooling effect of nitrogen, enhances the protective capability of the fire extinguishing system, and reduces the risk of internal fires in transformers.
Smart Images
Figure CN224307718U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fire extinguishing and protection devices, specifically a nitrogen fire extinguishing and protection device for an oil-immersed transformer. Background Technology
[0002] Oil-immersed transformers use transformer oil as the insulation and cooling medium. Their core components include the core, windings, tank, radiator, and gas relay. The transformer oil carries away heat through circulation while providing insulation. However, oil-immersed transformers pose a fire risk: internal faults (such as short circuits or overvoltages) can trigger an electric arc, causing the oil to decompose and produce flammable gases. A sudden increase in tank pressure can lead to rupture, allowing oxygen to enter and mix with the flammable gases, which can then explode and ignite upon contact with an open flame.
[0003] The nitrogen fire extinguishing system achieves protection through a "rapid oil draining-nitrogen injection extinguishing" mechanism: when a fault occurs, the gas relay is activated, the oil drain valve is opened, and the hot oil at the top is quickly drained, reducing the oil level and pressure in the tank to prevent an explosion; nitrogen is injected from the bottom of the transformer to cool the high-temperature oil at the top layer, while isolating oxygen, so that the oil temperature drops below the ignition point to prevent reignition.
[0004] In the existing technology, nitrogen is usually injected directly into the transformer. Due to the lack of a stirring structure, the oil in the transformer has low fluidity, which in turn leads to poor heat exchange between the low-temperature nitrogen and the oil.
[0005] Therefore, a nitrogen fire extinguishing and protection device for oil-immersed transformers is proposed to address the above problems. Utility Model Content
[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.
[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: An oil-immersed transformer nitrogen fire extinguishing and protection device of this utility model includes a base, on the top of which a transformer body is fixedly installed; an oil conservator is fixedly installed on one side of the transformer body, and the transformer body and the oil conservator are connected by a pipe; a housing is fixedly installed on the top of the base; a nitrogen cylinder is provided inside the housing; a main pipe is connected to the top of the nitrogen cylinder, and the main pipe surrounds the outside of the transformer body; multiple branch pipes are connected inside the main pipe, and the branch pipes penetrate the transformer body; an oil drain pipe is connected to one side of the transformer body; an oil storage tank is connected to the end of the oil drain pipe, and the oil storage tank is located at the bottom of the base; a perforated plate is fixedly connected to the inner wall of the branch pipe; a turbine is rotatably connected to the inner wall of the perforated plate; a rotating shaft is fixedly connected to the top of the turbine; a stirring blade is fixedly connected to the end of the rotating shaft; a detection component is provided on the top of the transformer body; through the combined action of the turbine and the stirring blade, the oil in the transformer body can be stirred by multiple stirring blades to improve the fluidity of the oil, thereby improving the cooling effect of nitrogen on the oil.
[0008] Preferably, a flow divider is fixedly connected to the inner wall of the branch pipe; multiple guide pipes are fixedly connected to the top of the flow divider, and the guide pipes are arc-shaped; through the cooperation of the flow divider and the guide pipes, nitrogen can flow along the turbine tangential direction, thereby improving the turbine's utilization rate of nitrogen kinetic energy.
[0009] Preferably, the branch pipe end is provided with a ball seat, and a ball is slidably connected to the middle of the rotating shaft; a limiting block is fixedly connected to the middle of the rotating shaft; the ball is located between the limiting block and the ball seat; when the valve at the main pipe is not open, the ball will be in close contact with the ball seat under the action of gravity and seal the branch pipe to reduce the oil entering the branch pipe, thereby reducing the resistance of the oil to the flow of nitrogen. When the main pipe is opened, the ball can be pushed out under the action of high-pressure nitrogen and abut against the limiting block. At this time, the airflow can flow out from between the ball seat and the ball. The arc shape on the surface of the ball will expand the airflow to increase the distribution range of cooling nitrogen in the transformer body.
[0010] Preferably, a membrane is fixed to the outer wall of the branch pipe; the surface of the membrane is provided with a tear line; by setting the membrane, when the main pipe is not started, the membrane will seal the branch pipe, further reducing the amount of oil entering the branch pipe. When nitrogen is sprayed out of the branch pipe, the membrane will expand under the action of gas pressure. Since the structural strength at the tear line is low, the membrane will rupture at the tear line. The ruptured membrane can tilt to both sides. By controlling the shape of the membrane rupture, the situation of the ruptured membrane entanglement with the stirring blade can be reduced.
[0011] Preferably, the outer wall of the stirring blade is fixed with multiple arc-shaped portions; the arc-shaped portions are located between the film and the stirring blade; by providing the arc-shaped portions, the arc-shaped portions can support the film and reduce the direct contact between the stirring blade and the film, thereby reducing the situation where the film becomes entangled with the stirring blade after it breaks.
[0012] Preferably, the outer wall of the transformer body is fixed with multiple fins; the fins are equidistantly arranged; by setting the fins, the contact area between the transformer body shell and the outside world can be increased, thereby assisting in the dissipation of internal heat and reducing the possibility of fire inside the transformer body.
[0013] The advantages of this utility model are:
[0014] 1. The nitrogen fire extinguishing and protection device for oil-immersed transformers described in this utility model can, through the combined action of turbine and stirring blades, stir the oil in the transformer body by multiple stirring blades to improve the fluidity of the oil and thus improve the cooling effect of nitrogen on the oil.
[0015] 2. The nitrogen fire extinguishing and protection device for an oil-immersed transformer described in this utility model, through the combined action of the diverter plate and the guide pipe, allows nitrogen to flow along the tangential direction of the turbine, thereby improving the utilization rate of nitrogen kinetic energy by the turbine. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the main body of this utility model;
[0018] Figure 2 This is a schematic diagram of the base structure in this utility model;
[0019] Figure 3 This is a schematic diagram of the transformer body in this utility model;
[0020] Figure 4 This is a schematic diagram of the structure of the main pipe in this utility model;
[0021] Figure 5 This is a schematic diagram of the branch pipe in this utility model;
[0022] Figure 6 This is a schematic diagram of the perforated plate in this utility model.
[0023] In the diagram: 1. Base; 12. Transformer body; 13. Oil conservator; 14. Housing; 15. Oil drain pipe; 16. Oil storage tank; 17. Nitrogen cylinder; 18. Main pipe; 19. Branch pipe; 110. Orifice plate; 111. Turbine; 112. Shaft; 113. Stirring blade; 2. Diverter plate; 22. Guide pipe; 3. Sphere; 32. Limiting block; 4. Membrane; 42. Tear line; 5. Arc-shaped part; 6. Fin. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0025] Specific implementation examples are given below.
[0026] Please see Figures 1 to 6As shown in the embodiment of this utility model, a nitrogen fire extinguishing and protection device for an oil-immersed transformer includes a base 1, on the top of which a transformer body 12 is fixedly installed; an oil tank 13 is fixedly installed on one side of the transformer body 12, and the transformer body 12 and the oil tank 13 are connected by a pipe; a housing 14 is fixedly installed on the top of the base 1; a nitrogen cylinder 17 is provided inside the housing 14; a main pipe 18 is connected to the top of the nitrogen cylinder 17, and the main pipe 18 surrounds the outside of the transformer body 12; multiple branch pipes 19 are connected inside the main pipe 18, and the branch pipes 19 penetrate the transformer body 12; one side of the transformer body 12 is connected to... There is an oil drain pipe 15; the end of the oil drain pipe 15 is connected to an oil storage tank 16, and the oil storage tank 16 is located at the bottom of the base 1; an orifice plate 110 is fixedly connected to the inner wall of the branch pipe 19; a turbine 111 is rotatably connected to the inner wall of the orifice plate 110; a rotating shaft 112 is fixedly connected to the top of the turbine 111; a stirring blade 113 is fixedly connected to the end of the rotating shaft 112; a detection component is provided on the top of the transformer body 12; during operation, the oil conservator 13 will supply oil into the transformer body 12 to cool the coils inside the transformer body 12. When the oil temperature is high, a fire may occur. The detection component will detect the inside of the transformer body 12 and can link relevant valves to drain oil and inject nitrogen. The detection components can specifically include a control module, a temperature sensor, and a smoke sensor. These are mature existing technologies, so their specific structures will not be elaborated upon. When the detection components detect a fire inside the transformer body 12, they can pump a portion of the oil inside the transformer body 12 to the oil storage tank 16 through the oil drain pipe 15. Simultaneously, the oil supply between the oil conservator 13 and the transformer body 12 is cut off. Then, the valve between the nitrogen cylinder 17 and the main pipe 18 can be opened to drive the high-pressure, low-temperature nitrogen in the nitrogen cylinder 17 through the main pipe 18 and all branch pipes 19 to spray into the oil inside the transformer body 12, creating an inert environment inside the transformer body 12 to achieve a fire extinguishing effect. The nitrogen flowing in the branch pipes 19 can... After passing through the turbine 111 and being ejected from the orifice plate 110, the turbine 111 rotates under the power of the airflow. The shaft 112 and the stirring blade 113 rotate with the turbine 111. The rotating stirring blade 113 can stir the local oil in the transformer body 12 to assist the nitrogen in cooling the oil. It is worth mentioning that the valve and pump structure involved in the above principle are mature technologies, so they are not described in detail here. Through the combined action of the turbine 111 and the stirring blade 113, the oil in the transformer body 12 can be stirred by multiple stirring blades 113 to improve the fluidity of the oil and thus improve the cooling effect of nitrogen on the oil.
[0027] Please see Figure 5 and Figure 6As shown, a flow divider 2 is fixedly connected to the inner wall of the branch pipe 19; multiple guide pipes 22 are fixedly connected to the top of the flow divider 2, and the guide pipes 22 are arc-shaped; when nitrogen flows inside the branch pipe 19, it can pass through the flow divider 2 and be ejected through the guide pipes 22. Since the guide pipes 22 are arc-shaped and their ends face the tangential direction of the turbine 111, the nitrogen can flow along the tangential direction of the turbine 111 and make it rotate, thereby improving the air impact effect of nitrogen on the turbine 111 and reducing energy loss; through the cooperation of the flow divider 2 and the guide pipes 22, the nitrogen can flow along the tangential direction of the turbine 111, thereby improving the utilization rate of nitrogen kinetic energy by the turbine 111.
[0028] Please see Figure 5 and Figure 6 As shown, the end of the branch pipe 19 is provided with a ball seat, and a ball 3 is slidably connected to the middle of the rotating shaft 112; a limiting block 32 is fixedly connected to the middle of the rotating shaft 112; the ball 3 is located between the limiting block 32 and the ball seat; when the valve at the main pipe 18 is not open, the ball 3 will be in close contact with the ball seat under the action of gravity and seal the branch pipe 19 to reduce the oil entering the branch pipe 19, thereby reducing the resistance of the oil to the flow of nitrogen. When the main pipe 18 is opened, the ball 3 can be pushed out under the action of high-pressure nitrogen and abut against the limiting block 32. At this time, the airflow can flow out from between the ball seat and the ball 3. The arc shape on the surface of the ball 3 will expand the airflow to increase the distribution range of cooling nitrogen in the transformer body 12.
[0029] Please see Figure 5 As shown, a membrane 4 is fixed to the outer wall of the branch pipe 19; the surface of the membrane 4 is provided with a tear line 42; by setting the membrane 4, when the main pipe 18 is not started, the membrane 4 will seal the branch pipe 19, further reducing the oil entering the branch pipe 19. When nitrogen gas is sprayed out of the branch pipe 19, the membrane 4 will expand under the action of gas pressure. Due to the low structural strength at the tear line 42, the membrane 4 will rupture at the tear line 42. The ruptured membrane 4 can tilt to both sides. By controlling the shape of the rupture of the membrane 4, the situation of the ruptured membrane 4 getting entangled with the stirring blade 113 can be reduced.
[0030] Please see Figure 5 and Figure 6 As shown, the outer wall of the stirring blade 113 is fixed with a plurality of arc-shaped portions 5; the arc-shaped portions 5 are located between the film 4 and the stirring blade 113; by setting the arc-shaped portions 5, the arc-shaped portions 5 can support the film 4 and reduce the direct contact between the stirring blade 113 and the film 4, thereby reducing the situation where the film 4 becomes entangled with the stirring blade 113 after it breaks.
[0031] Please see Figure 1 and Figure 2As shown, multiple fins 6 are fixed to the outer wall of the transformer body 12; the fins 6 are equidistantly arranged; by setting the fins 6, the fins 6 can increase the contact area between the outer shell of the transformer body 12 and the outside world, thereby assisting in the dissipation of internal heat and reducing the possibility of fire inside the transformer body 12.
[0032] Working principle: The oil conservator 13 supplies oil to the transformer body 12 to cool the coils inside the transformer body 12. When the oil temperature is high, a fire may occur. The detection component will detect the inside of the transformer body 12 and can activate relevant valves to drain the oil and inject nitrogen. The detection component can specifically be a control module, a temperature sensor, and a smoke sensor. This is mature existing technology, so its specific structure will not be described in detail. When the detection component detects a fire inside the transformer body 12, it can pump some of the oil inside the transformer body 12 into the oil storage tank 16 through the oil drain pipe 15, and at the same time cut off the oil supply between the oil conservator 13 and the transformer body 12. Then, the valve between the nitrogen cylinder 17 and the main pipe 18 can be opened to drive the nitrogen cylinder. High-pressure, low-temperature nitrogen gas within pipe 17 is injected into the oil inside the transformer body 12 via the main pipe 18 and all branch pipes 19, creating an inert environment within the transformer body 12 for fire extinguishing. As the nitrogen gas flows within the branch pipes 19, it passes through the turbine 111 and exits from the orifice plate 110. The turbine 111 rotates under the power of the airflow, causing the shaft 112 and stirring blades 113 to rotate as well. The rotating stirring blades 113 agitate the localized oil within the transformer body 12, assisting the nitrogen gas in cooling the oil. It is worth noting that the valves and pump structures involved in the above principle are mature technologies, and therefore are not described in detail here. When the nitrogen gas flows inside the branch pipes 19, it can... After passing through the splitter plate 2 and being ejected through the guide pipe 22, the nitrogen gas is allowed to flow and rotate along the tangent of the turbine 111 due to the arc-shaped design of the guide pipe 22 and its end facing the tangential direction of the turbine 111. This enhances the nitrogen's impact on the turbine 111 and reduces energy loss. When the valve at the main pipe 18 is not open, the ball 3 will adhere tightly to the ball seat under gravity and seal the branch pipe 19, reducing the amount of oil entering the branch pipe 19 and thus reducing the resistance of the oil to the flow of nitrogen. When the main pipe 18 is opened, the ball 3 can be pushed out under the impact of high-pressure nitrogen and abut against the limiting block 32. At this time, the airflow can flow out between the ball seat and the ball 3. The arc shape of the ball 3's surface will amplify the airflow to increase the variable flow rate. The distribution range of cooling nitrogen gas inside the compressor body 12; by setting the diaphragm 4, when the main pipe 18 is not started, the diaphragm 4 will seal the branch pipe 19, further reducing the oil entering the branch pipe 19. When nitrogen gas is sprayed out of the branch pipe 19, the diaphragm 4 will expand under the action of gas pressure. Due to the low structural strength at the tear line 42, the diaphragm 4 will rupture at the tear line 42. After rupture, the diaphragm 4 can tilt to both sides. By controlling the shape of the rupture of the diaphragm 4, the situation of the ruptured diaphragm 4 entangled with the stirring blade 113 can be reduced; by setting the arc-shaped part 5, the arc-shaped part 5 can support the diaphragm 4 and reduce the direct contact between the stirring blade 113 and the diaphragm 4, thereby reducing the situation of the diaphragm 4 entangled with the stirring blade 113 after rupture;By incorporating fins 6, the contact area between the transformer body 12 casing and the external environment is increased, thereby aiding in heat dissipation and reducing the likelihood of fire inside the transformer body 12.
[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A nitrogen fire extinguishing and protection device for an oil-immersed transformer, comprising a base (1), characterized in that: A transformer body (12) is fixedly installed on the top of the base (1); an oil tank (13) is fixedly installed on one side of the transformer body (12), and the transformer body (12) and the oil tank (13) are connected by a pipe; a housing (14) is fixedly installed on the top of the base (1); a nitrogen cylinder (17) is provided inside the housing (14); a main pipe (18) is connected to the top of the nitrogen cylinder (17), and the main pipe (18) surrounds the outside of the transformer body (12); multiple branch pipes (19) are connected inside the main pipe (18), and the branch pipes (19) are connected to each other. The transformer body (12) is through-connected; an oil drain pipe (15) is connected to one side of the transformer body (12); an oil storage tank (16) is connected to the end of the oil drain pipe (15), and the oil storage tank (16) is located at the bottom of the base (1); a perforated plate (110) is fixedly connected to the inner wall of the branch pipe (19); a turbine (111) is rotatably connected to the inner wall of the perforated plate (110); a rotating shaft (112) is fixedly connected to the top of the turbine (111); a stirring blade (113) is fixedly connected to the end of the rotating shaft (112); a detection component is provided on the top of the transformer body (12).
2. The nitrogen fire extinguishing and protection device for an oil-immersed transformer according to claim 1, characterized in that: A diversion plate (2) is fixedly connected to the inner wall of the branch pipe (19); a plurality of guide pipes (22) are fixedly connected to the top of the diversion plate (2), and the guide pipes (22) are arranged in an arc shape.
3. The nitrogen fire extinguishing and protection device for an oil-immersed transformer according to claim 2, characterized in that: The branch pipe (19) is provided with a ball seat at its end, and a ball (3) is slidably connected to the middle of the rotating shaft (112); a limiting block (32) is fixedly connected to the middle of the rotating shaft (112); the ball (3) is located between the limiting block (32) and the ball seat.
4. The nitrogen fire extinguishing and protection device for an oil-immersed transformer according to claim 3, characterized in that: A thin film (4) is fixed to the outer wall of the branch pipe (19); the surface of the thin film (4) is provided with tear lines (42).
5. A nitrogen fire extinguishing and protection device for an oil-immersed transformer according to claim 4, characterized in that: The outer wall of the stirring blade (113) is fixed with a plurality of arc-shaped parts (5); the arc-shaped parts (5) are located between the film (4) and the stirring blade (113).
6. A nitrogen fire extinguishing and protection device for an oil-immersed transformer according to claim 5, characterized in that: The transformer body (12) has multiple fins (6) fixed to its outer wall; the fins (6) are arranged at equal intervals.