Explosion-proof reinforced compact converter transformer oil tank

Abstract

The utility model belongs to the field of transformer manufacturing, and relates to an anti-explosion reinforced compact converter transformer oil tank which comprises an oil tank cover and an oil tank body. The oil tank body comprises an oil tank bottom, a peripheral oil tank cooling side tank wall, an oil tank long-axis side valve side tank wall, an oil tank valve sleeve side tank wall and an oil tank long-axis side net side tank wall which are welded into a whole, the two ends of the oil tank cooling side tank wall in the vertical direction are of inward bent structures, and the end, corresponding to the oil tank cooling side tank wall, of the oil tank cover is of a corner cut structure. The multiple pieces of groove type reinforcing iron are welded to the outer surface of the oil tank cooling side tank wall body in the vertical direction, and the edges of one ends of the multiple pieces of I-shaped special-shaped reinforcing iron are tightly attached to the groove type reinforcing iron on the outermost side of the oil tank cooling side tank wall body and are welded to the outer surface of the inwards-bent structure in the horizontal direction. And pressure relief valves II are arranged at four corners of the oil tank cover and in areas close to the valve ascending flanged seats. The explosion-proof capacity, the bearing capacity and the non-deformability of the converter transformer are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformer manufacturing, and relates to an explosion-proof and strengthened compact converter transformer oil tank. Background Art

[0002] With the rapid development of the power industry and the increasing expansion of the power grid scale, as a key device in the DC transmission system, the reliability and stability of the operation of the converter transformer have become increasingly prominent for the entire power system. The converter transformer not only needs to withstand the action of complex electromagnetic fields, but also has to cope with various harsh operating environments, such as high temperature, high pressure, humidity and pollution, etc. These conditions pose extremely high requirements for the design, manufacture and operation of the converter transformer.

[0003] In the structure of the converter transformer, the oil tank body and the oil tank cover, as important parts for supporting and protecting the internal components of the transformer, their design quality and structural strength directly affect the overall performance and safety of the converter transformer. Although the traditional design of the converter transformer oil tank meets the operation requirements to a certain extent, in some special working conditions, there may still be problems such as insufficient structural strength and excessive deformation, thus affecting the normal operation of the transformer. And when a short-circuit fault occurs inside the transformer, the gas generated by the fault will cause the internal pressure of the oil tank to increase suddenly. When the pressure is too large and exceeds the bearing limit of the oil tank, the oil tank will crack or explode. Summary of the Invention

[0004] In view of these technical problems above, the utility model provides an explosion-proof and strengthened compact converter transformer oil tank. The technical solution adopted by the utility model is as follows:

[0005] An explosion-proof and strengthened compact converter transformer oil tank, the converter transformer oil tank includes an oil tank cover and an oil tank body. The oil tank body includes an oil tank bottom welded into one body and the surrounding oil tank cooling side walls, oil tank long-axis side valve side walls, oil tank valve bushing side walls and oil tank long-axis side mesh side walls. The oil tank cover is sealed and installed above the oil tank body. The two vertical ends of the oil tank cooling side wall adopt an inward bending structure. Between the two inward bending structures at the two ends is the oil tank cooling side wall body. One end of the oil tank cover corresponding to the oil tank cooling side wall adopts a chamfering structure. The chamfering structure of the oil tank cover cooperates with the inward bending structure of the oil tank cooling side wall. A number of groove-shaped reinforcing irons are vertically and evenly welded on the outer surface of the oil tank cooling side wall body. One end edge of a number of I-shaped special-shaped reinforcing irons closely adheres to the outermost groove-shaped reinforcing iron on the oil tank cooling side wall body and is horizontally and evenly welded on the outer surface of the inward bending structure. A number of oil tank cover reinforcing irons are welded on the upper surface of the oil tank cover. Pressure relief valves II are arranged at the four corners of the oil tank cover and in the area near the valve riser.

[0006] Preferably, a valve elevation seat is fixedly installed on the outer side of the side wall of the fuel tank valve sleeve. An inclined bulging side wall is welded at one end of the valve side wall on the long axis side of the fuel tank close to the valve elevation seat. The inclined angle of the bulging side wall extends along the outer diameter of the valve elevation seat on the valve side wall on the long axis side of the fuel tank.

[0007] Preferably, a blanking plate is welded at the end of the bulging side wall far from the valve elevation seat. A notch matching the radian of the bulging side wall is cut on the side wall reinforcing iron, and the side wall reinforcing iron is vertically welded on the outer side of the bulging side wall.

[0008] Preferably, a high-voltage elevation seat on the network side and a neutral point elevation seat on the network side are fixedly installed above the fuel tank cover.

[0009] Preferably, a pipe joint is welded in the middle and upper part of the high-voltage elevation seat on the network side, and a pressure relief valve 1 is fixedly installed on the pipe joint through bolts.

[0010] Preferably, a reinforcing iron is welded at the position of the elevation seat cylinder wall on the fuel tank cover and the high-voltage elevation seat on the network side.

[0011] Preferably, a number of special-shaped reinforcing irons are evenly welded and arranged on the inward-bending structure. Rectangular plates in the vertical direction are welded at the upper and lower ends in the middle of the special-shaped reinforcing iron. The two ends of the top rectangular plate are respectively connected to the upper surface of the uppermost special-shaped reinforcing iron and the lower surface of the upper box edge of the fuel tank body. The two ends of the middle rectangular plate are respectively connected to the lower surface and the upper surface of the adjacent special-shaped reinforcing iron. The two ends of the bottom rectangular plate are respectively connected to the lower surface of the lowermost special-shaped reinforcing iron and the upper surface of the lower transverse reinforcing iron of the fuel tank body.

[0012] Preferably, rectangular plates are welded at the end positions of the special-shaped reinforcing iron adjacent to the network side wall on the long axis side of the fuel tank and the valve side wall on the long axis side of the fuel tank. Triangular plate reinforcing irons are welded at the end positions of the special-shaped reinforcing iron adjacent to the trough-shaped reinforcing iron. Triangular plate reinforcing irons are welded at both the upper and lower ends of the special-shaped reinforcing iron.

[0013] Preferably, the pressure relief valve 2 is fixedly connected to the connecting flange welded on the fuel tank cover through bolts.

[0014] Preferably, the fuel tank cover and the upper part of the fuel tank body are hermetically connected by a welded box edge.

[0015] The beneficial effects of the present utility model:

[0016] The present utility model adopts advanced design concepts and manufacturing processes. By designing an inward-bending structure, reasonably arranging the reinforcing rib structure, and setting a number of pressure relief valves 2, etc., the explosion-proof ability, load-bearing capacity, and anti-deformation ability of the converter transformer fuel tank body and the fuel tank cover are significantly improved, thereby effectively preventing or reducing the damage caused by the explosion of the converter transformer fuel tank. And on the premise of ensuring the internal insulation distance, the design of the converter transformer fuel tank body is made as small as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some specific embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings within the scope of protection of this application can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the converter transformer oil tank according to an embodiment of the present invention;

[0019] Figure 2 It is a top view of the chamfered structure of the tank cover from the upper left oblique view according to an embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the explosion-proof oil tank cover according to an embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of adding a pressure relief valve to the high-voltage riser according to an embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the bulging structure of the valve side tank wall according to an embodiment of the present invention;

[0023] Figure 6 It is a schematic diagram of the structure of the special-shaped reinforcing iron on the chamfered side according to an embodiment of the present invention;

[0024] In the figure, 1 is the line-side high-voltage riser, 2 is the line-side neutral point riser, 3 is the oil tank cover, 4 is the oil tank body, 5 is the valve riser, 6 is the special-shaped reinforcing iron, 7 is the trough-shaped reinforcing iron, 8 is the inward bending structure, 9 is the pressure relief valve 1, 10 is the locally bulging tank wall, 11 is the valve side tank wall on the long axis side of the oil tank, 12 is the side wall reinforcing iron, 13 is the rectangular plate, 14 is the pressure relief valve 2, 15 is the triangular plate reinforcing iron, 16 is the oil tank cover reinforcing iron, and 17 is the pipe joint. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will further illustrate the present invention through examples in conjunction with the drawings. The specific implementation process is as follows:

[0026] As Figure 1 shown, the explosion-proof and enhanced compact converter transformer oil tank includes an oil tank cover 3 and an oil tank body 4. The oil tank body 4 includes an integrally formed oil tank bottom and the surrounding oil tank side walls. The surrounding oil tank side walls sequentially include: the oil tank cooling side wall ( Figure 1 the left side in Figure 1the rear middle side), the tank valve bushing side tank wall ( Figure 1 the right middle side) and the long axis side net side tank wall of the fuel tank ( Figure 1 the front middle side). A fuel tank cover 3 is sealed and installed above the fuel tank body 4. A high-voltage riser on the net side 1 and a neutral point riser on the net side 2 are fixedly installed above the fuel tank cover 3. A valve riser 5 is fixedly installed on the outer side of the tank valve bushing side tank wall. The upper parts of the fuel tank cover 3 and the fuel tank body 4 are sealed and connected by a welded tank rim. The materials of the fuel tank cover 3 and the fuel tank body 4 are both low-alloy steel plates of model Q355D.

[0027] As Figure 2 shown, both ends of the tank cooling side tank wall in the vertical direction adopt an inward bending structure 8. The inward bending structure 8 bends inward from about 1 / 6 of the width dimension at both ends in the width direction of the tank cooling side tank wall. Correspondingly, one end of the fuel tank cover 3 corresponding to the tank cooling side tank wall adopts a chamfering structure, and the chamfering structure of the fuel tank cover 3 cooperates with the inward bending structure 8 of the tank cooling side tank wall. Bending inward from about 1 / 6 of the width dimension at both ends in the width direction of the tank cooling side tank wall to form the inward bending structure 8 not only facilitates the bending operation of large-size steel plates but also can more evenly increase the stress area of the tank cooling side tank wall here. First, the channel-shaped reinforcing iron 7 is welded vertically on the outer side of the middle part of the tank cooling side tank wall, and the edges of several "I"-shaped special-shaped reinforcing irons 6 are closely attached to the outermost channel-shaped reinforcing iron 7 on the tank cooling side tank wall and are welded horizontally and evenly on the outer surface of the inward bending structure 8.

[0028] The tank cooling side tank wall adopts an inward bending structure 8 in the vertical direction, and the edges of the inward bending structure 8 are respectively welded and spliced with the long axis side net side tank wall and the long axis side valve side tank wall 11 of the fuel tank. Figure 2 Two chamfers are formed at the inward bending structure 8 of the tank cooling side tank wall of the fuel tank. If the insulation distance can be guaranteed, a fuel tank structure with four chamfers can also be designed by adopting a bending structure at the tank valve bushing side tank wall.

[0029] Design principle of the chamfered explosion-proof fuel tank structure: According to the pressure calculation formula in physics it can be known that the stress area at the weak connection of the fuel tank wall is increased through the design of the fuel tank chamfer structure . When a fault occurs inside the transformer fuel tank, the arc discharge fault causes the internal pressure of the fuel tank to rise rapidly. When the same pressure acts on the increased area of the tank cooling side tank wall, the pressure decreases, enhancing the mechanical reliability of the transformer fuel tank.

[0030] As Figure 3As shown in the figure, one end of the fuel tank cover 3 corresponding to the cooling side wall of the fuel tank adopts a chamfered structure. A plurality of reinforcing irons 16 for the fuel tank cover are evenly welded at the weak parts of the upper surface of the fuel tank cover 3. The reinforcing irons 16 for the fuel tank cover are made of low-alloy steel plates. A plurality of "I"-shaped structures are arranged between adjacent reinforcing irons 16 for the fuel tank cover, further strengthening the yield strength and tensile limit of the fuel tank cover 3 under positive and negative pressure tests. As many pressure relief valves II 14 as possible are arranged at the diagonals and the area near the valve riser 5 of the fuel tank cover 3. Five pressure relief valves II 14 are arranged in the figure, replacing the traditional structure of arranging two pressure relief valves diagonally. Increasing the number of pressure relief valves can ensure that when an arc discharge fault occurs in the transformer, the internal pressure rises rapidly, resulting in a sharp increase in the stress inside the transformer tank and causing rupture or explosion accidents. Among them, the pressure relief valve II 14 is fixed together by connecting with a connecting flange welded on the fuel tank cover 3 using bolts.

[0031] As Figure 4 shown in the figure, according to the simulation of internal faults of the transformer and the study of stress and deformation nephograms of key parts under different working conditions, it is found that the high-voltage riser 1 on the line side is the key pressure relief area and the focus of explosion-proof design. A pipe joint 17 is welded in the upper and middle parts of the high-voltage riser 1 on the line side. A pressure relief valve I 9 is fixedly installed on the pipe joint 17 through high-strength bolts. By increasing the thickness of the pipe joint 17 and using high-strength bolts for connection and installation, the explosion-proof performance of the transformer tank is further enhanced. The pressure relief valve I 9 adopts a diaphragm-type pressure relief device. The wall thickness of the high-voltage riser 1 on the line side is strengthened to ≥8 mm, and the installation bolt specification adopts 12.9-grade high-strength bolts. The pressure relief valve I 9 is installed below the current transformer on the line side to ensure that the position of the pressure relief valve I 9 does not affect the insulation strength between the tail end of the bushing and the line-side outgoing device, and the pressure relief port of the pressure relief valve I 9 is much higher than the line-side outgoing device. After pressure relief, the insulation structure of the line-side outgoing device will still be immersed in the transformer oil; in addition, a reinforcing iron is welded at the riser barrel wall between the high-voltage riser 1 on the line side and the fuel tank cover 3 to strengthen the fixing strength between the high-voltage riser 1 on the line side and the fuel tank cover 3 and prevent the high-voltage riser 1 on the line side from deforming.

[0032] By arranging a plurality of pressure relief valves II 14 (arranged in multiple numbers) at the diagonals and the middle part of the fuel tank cover 3, and arranging a pressure relief valve I 9 in the upper and middle parts of the high-voltage riser on the line side, it is better to avoid problems such as deformation and explosion of the fuel tank caused by a sharp increase in the pressure inside the transformer fuel tank when a fault occurs inside the fuel tank.

[0033] As Figure 5As shown in the figure, in order to ensure the insulation distance of the valve bushing and make the tank structure as compact as possible, an inclined bulging tank wall 10 is provided at one end of the valve-side tank wall 11 on the long axis side of the tank close to the valve riser 5. The inclined angle of the bulging tank wall 10 follows the outer diameter of the valve riser 5 and extends along the valve-side tank wall 11 on the long axis side of the tank. The length of the bulging tank wall 10 is determined according to the specific dimensions of the internal lead-out device. After the tank is assembled and welded, the bulging tank wall 10 is welded to the valve-side tank wall 11 on the long axis side of the tank. The tail end of the bulging tank wall 10 is welded with a blanking plate to seal it. A notch matching the arc of the bulging tank wall 10 is cut on the side wall reinforcing iron 12, and the side wall reinforcing iron 12 is welded vertically on the outer side of the outer wall of the bulging tank wall 10.

[0034] By welding the arc-shaped bulging tank wall 10 along the valve riser 5 on the valve-side tank wall 11 on the long axis side of the tank, this structure not only meets the requirements of the lead insulation distance, but also realizes the minimum compact structure design of the transformer tank volume to a greater extent, avoiding problems such as increased consumption of sheet materials and transformer oil caused by the increase of the tank inner diameter due to the increase of the insulation distance.

[0035] As Figure 6 shown in the figure, several special-shaped reinforcing irons 6 are evenly welded and arranged at the upper, middle and lower parts of the inward bending structure 8 in the vertical direction. Rectangular plates 13 in the vertical direction are welded to the upper and lower ends of the middle part of each special-shaped reinforcing iron 6 respectively. The two ends of the top rectangular plate 13 are respectively connected to the upper surface of the uppermost special-shaped reinforcing iron 6 and the lower surface of the upper tank edge of the tank body 4. The two ends of the middle rectangular plate 13 are respectively connected to the lower surface and the upper surface of two adjacent special-shaped reinforcing irons 6. The two ends of the bottom rectangular plate 13 are respectively connected to the lower surface of the lowermost special-shaped reinforcing iron 6 and the upper surface of the lower horizontal reinforcing iron of the tank body 4. For the part where the horizontal end of the special-shaped reinforcing iron 6 is welded to the valve-side tank wall on the long axis side of the tank and the net-side tank wall on the long axis side of the tank, welding reinforcement is carried out using the rectangular plate 13 according to the actual dimensions of the special-shaped reinforcing iron 6. For the part where the horizontal end of the special-shaped reinforcing iron 6 is welded to the channel-shaped reinforcing iron 7, welding reinforcement is carried out using the triangular plate reinforcing iron 15 according to the actual dimensions of the special-shaped reinforcing iron 6. Triangular plate reinforcing irons 15 are welded to both the upper and lower ends of the special-shaped reinforcing iron 6, and the triangular plate reinforcing irons 15 are welded vertically on the inward bending structure 8 to form a multi-layer "I"-shaped reinforcing iron structure. By welding multiple special-shaped reinforcing irons 6 arranged in a surrounding manner on the outer side of the tank wall on the cooling side of the tank, the mechanical strength of the weak part of the tank is further enhanced.

[0036] The utility model focuses on the innovation of the production and manufacturing technology of converter transformers, and proposes an explosion-proof enhanced compact converter transformer oil tank. By introducing an oil tank chamfer structure, a bulged tank wall structure, a pressure relief valve structure with multi-point layout of the tank cover and the riser, and an "I"-shaped special-shaped reinforcing iron structure arranged at the chamfer, the explosion-proof performance of the converter transformer is effectively enhanced, and the mechanical stability and reliability of the converter transformer are significantly improved. These strengthening structures are designed to improve the bearing capacity and anti-deformation ability of the oil tank body 4 and the oil tank cover 3 of the converter transformer by optimizing the structural design and improving the connection reliability, so as to ensure that the converter transformer can maintain a stable operating state under various working conditions.

[0037] Finally, it should be noted that the above embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art within the technical scope disclosed by the present utility model can modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model.

Claims

1. An explosion-proof reinforced compact converter transformer oil tank, the converter transformer oil tank comprising an oil tank cover and an oil tank body, the oil tank body comprising an integrally welded oil tank bottom and surrounding oil tank cooling side walls, oil tank long axis side valve side walls, oil tank valve sleeve side walls and oil tank long axis side mesh side walls, the oil tank cover is sealed and installed above the oil tank body, characterized in that: The two ends of the oil tank cooling side wall adopt inward bending structures in the vertical direction, and the oil tank cooling side wall body is located between the inward bending structures at the two ends, and the oil tank cover adopts an angled structure at one end corresponding to the oil tank cooling side wall, and the angled structure of the oil tank cover cooperates with the inward bending structure of the oil tank cooling side wall, and a number of groove-type reinforcing irons are evenly welded in the vertical direction on the outer surface of the oil tank cooling side wall body, and one end edge of a number of I-shaped special-shaped reinforcing irons is tightly attached to the outermost groove-type reinforcing iron on the oil tank cooling side wall body and is evenly welded in the horizontal direction on the outer surface of the inward bending structure, and multiple oil tank cover reinforcement irons are welded on the upper surface of the oil tank cover, and pressure release valve 2 is arranged at the four corners of the oil tank cover and in the area near the valve lift seat.

2. The explosion-proof reinforced compact converter transformer oil tank according to claim 1 is characterized in that: A valve lifting seat is fixedly installed on the outer side of the box wall on the valve sleeve side of the oil tank, and an inclined bulging box wall is welded on the end of the valve side box wall on the long axis side of the oil tank close to the valve lifting seat. The oblique angle of the bulging box wall extends along the outer diameter of the valve lifting seat on the valve side box wall on the long axis side of the oil tank.

3. The explosion-proof reinforced compact converter transformer oil tank according to claim 2 is characterized in that: A plugging plate is welded to the tail end of the drum box wall away from the valve lifting seat, a notch matching the curvature of the drum box wall is cut on the side wall reinforcement iron, and the side wall reinforcement iron is welded to the outer side of the drum box wall in a vertical direction.

4. The explosion-proof reinforced compact converter transformer oil tank according to claim 1 is characterized in that: The grid-side high-pressure raising seat and the grid-side neutral point raising seat are fixedly installed above the fuel tank cover.

5. The explosion-proof reinforced compact converter transformer oil tank according to claim 4 is characterized in that: A pipe joint is welded on the upper middle part of the high-pressure lifting seat on the network side, and a pressure relief valve is fixed to the pipe joint by bolts.

6. The explosion-proof reinforced compact converter transformer oil tank according to claim 5, characterized in that: Reinforcement iron is welded between the high-pressure lifting seat on the grid side and the lifting seat cylinder wall on the oil tank cover.

7. The explosion-proof reinforced compact converter transformer oil tank according to claim 1, characterized in that: Several special-shaped reinforcement irons are evenly welded and arranged on the inward bending structure, and vertical rectangular plates are respectively welded to the upper and lower ends of the middle part of the special-shaped reinforcement iron. The two ends of the top rectangular plate are respectively connected to the upper surface of the top special-shaped reinforcement iron and the lower surface of the upper box edge of the oil tank body, the two ends of the middle rectangular plate are respectively connected to the lower surface and upper surface of the adjacent special-shaped reinforcement iron, and the two ends of the bottom rectangular plate are respectively connected to the lower surface of the bottom special-shaped reinforcement iron and the upper surface of the lower horizontal reinforcement iron of the oil tank body.

8. The explosion-proof reinforced compact converter transformer oil tank according to claim 7, characterized in that: A rectangular plate is welded to the end position where the special-shaped reinforcement iron is adjacent to the mesh side box wall and the valve side box wall on the long axis side of the oil tank, a triangular plate reinforcement iron is welded to the end position where the special-shaped reinforcement iron is adjacent to the groove-type reinforcement iron, and triangular plate reinforcement irons are welded to both the upper and lower ends of the special-shaped reinforcement iron.

9. The explosion-proof reinforced compact converter transformer oil tank according to any one of claims 1 to 8, characterized in that: The second pressure relief valve is fixedly connected to a connecting flange welded on the oil tank cover by bolts.

10. The explosion-proof reinforced compact converter transformer oil tank according to claim 9, characterized in that: The fuel tank cover and the upper part of the fuel tank body are connected by a welded tank edge seal.

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