A-shaped support and transformer cooling system

Abstract

The utility model belongs to transformer cooling equipment technical field relates to a kind of A-shaped support and transformer cooling system.A-shaped support, upper support module is the A-shaped of upper narrow lower wide, lower support module is the H-shaped of upper narrow lower wide, and upper support module includes upper cooling main pipe support plate, upper connecting pipe and upper connecting plate, a pair of ground nuts is welded on upper cooling main pipe support plate, and ground wire two ends are connected with a pair of ground nuts welding;Lower support module includes lower connecting plate, lower connecting pipe and foundation positioning bottom plate, corresponding long waist shape mounting hole is set up in lower connecting plate and upper connecting plate, and lower cooling main pipe support mechanism is set up in the upper portion of lower connecting pipe middle portion.Transformer cooling system, upper cooling main pipe is installed in the upper portion of upper cooling main pipe support plate, and lower cooling main pipe is installed in the upper portion of lower cooling main pipe support mechanism.The utility model reduces transportation cost, and on-site assembly time is short.

Description

Technical Field

[0001] This utility model belongs to the technical field of transformer cooling equipment, specifically relating to an A-shaped bracket and transformer cooling system for a centralized transformer cooling system, which is particularly suitable for split cooling transformers with voltage levels of 220kV and above. Background Technology

[0002] In power transformer cooling systems, the support frame serves as the mounting carrier for the cooling equipment, and its structural design directly affects the ease of installation, operational stability, and transportation economy of the equipment.

[0003] The existing transformer cooling brackets have the following drawbacks: traditional brackets mostly adopt an integral welded structure, which increases transportation costs due to the brackets exceeding size limits, and the overall transportation cost of a single traditional bracket is very high; the bracket structure does not fully utilize the mechanical principle of triangles, resulting in limited load-bearing capacity, and it is prone to deformation when the weight of the cooling equipment increases; the grounding structure design is imperfect, which poses a risk of static electricity accumulation and leakage, affecting the operational safety of the equipment. Summary of the Invention

[0004] This utility model aims to provide an A-shaped bracket that is structurally stable, easy to transport, highly accurate in installation, and reliably grounded. Through a modular, split design and a triangular mechanical support structure, it solves the problems of excessive transport requirements, complex installation, and insufficient stability in existing technologies. The technical solution adopted by this utility model is as follows: An A-shaped bracket includes a detachable upper bracket module and a lower bracket module. The upper bracket module is A-shaped, and the lower bracket module is H-shaped (narrower at the top and wider at the bottom). The upper bracket module includes a horizontal upper cooling main pipe support plate at the top, an upper connecting pipe in the middle, and an upper connecting plate at the bottom. A pair of grounding nuts are welded to the upper cooling main pipe support plate, and the two ends of the grounding wire are welded to the pair of grounding nuts. The lower bracket module includes a horizontal lower connecting pipe in the middle, a base positioning plate at the bottom, and a lower connecting plate at the top. Corresponding elongated mounting holes are provided on the lower connecting plate and the upper connecting plate. A lower cooling main pipe support mechanism is provided above the middle of the lower connecting pipe.

[0005] Preferably, the upper support module also includes two upper support steel pipes. The upper ends of the two upper support steel pipes are fixedly connected to the upper cooling mother pipe support plate, the lower ends of the two upper support steel pipes are inclined to the two sides, the middle and lower parts of the two upper support steel pipes are fixedly connected to both ends of the upper connecting pipe, and the lower ends of the two upper support steel pipes are fixedly connected to the upper connecting plate.

[0006] Preferably, upper support hanging plates are symmetrically welded to the outer sides of the middle of the two upper support steel pipes, and a hanging hole is opened at the center of the upper support hanging plate.

[0007] Preferably, the lower support module also includes two lower support steel pipes. The upper ends of the two lower support steel pipes are fixedly connected to the lower connecting plate. The lower ends of the two lower support steel pipes are inclined to the two sides. The middle and lower parts of the two lower support steel pipes are fixedly connected to both ends of the lower connecting pipe. The lower ends of the two lower support steel pipes are fixedly connected to the foundation positioning base plate.

[0008] Preferably, a lower cooling main pipe support mechanism is fixedly installed above the lower connecting pipe. The cooling main pipe support mechanism includes a pair of vertical support plates symmetrically welded to the arc surface of the lower connecting pipe. The top ends of the pair of vertical support plates are welded to the lower surface of the lower cooling main pipe support plate in the horizontal direction.

[0009] Preferably, a lower connecting pipe support mechanism is fixedly installed below the lower connecting pipe. The lower connecting pipe support mechanism includes a pair of vertical support plates symmetrically welded to the lower arc surface of the lower connecting pipe, and the bottom ends of the pair of vertical support plates are welded to the upper surface of the lower connecting pipe support plate in the horizontal direction.

[0010] Preferably, the lower surface center of the lower connecting pipe support plate is welded to the upper end of the lower connecting pipe support steel pipe, and the lower end of the lower connecting pipe support steel pipe is fixedly connected to the foundation positioning base plate.

[0011] Preferably, the lower support plate is symmetrically welded to the outer side of the middle of the two lower support steel pipes, and a second lifting hole is opened at the center of the lower support plate.

[0012] A transformer cooling system, using the aforementioned A-shaped bracket, includes several fins. The upper end of each fin is connected to an upper cooling header, and the lower end of each fin is connected to a lower cooling header. The upper cooling header is connected to an oil tank via an upper cooling connecting pipe, and the lower cooling header is connected to an oil tank via a lower cooling connecting pipe. The upper cooling header is installed above an upper cooling header support plate, and the lower cooling header is installed above a lower cooling header support mechanism.

[0013] The beneficial effects of this utility model are: This utility model features a detachable upper support module and a lower support module, which can be transported separately or stacked in multiple layers, greatly reducing transportation costs. The upper and lower support modules can be quickly assembled on-site, reducing on-site assembly time from 8 hours to 4 hours, eliminating the need for 2 installation personnel, and requiring no professional welding equipment. Grounding safety is ensured by setting grounding nuts and grounding wires. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1This is a front view of the assembly structure of the A-shaped bracket according to an embodiment of the present invention; Figure 2 This is a front view of the split structure of the A-shaped bracket according to an embodiment of the present utility model, wherein part a is the upper bracket module and part b is the lower bracket module; Figure 3 This is a partial enlarged view of the grounding nut and grounding wire in an embodiment of this utility model; Figure 4 This is a three-dimensional schematic diagram of the A-shaped bracket installed in the cooling system according to an embodiment of the present invention; In the diagram, 1 is the upper cooling main pipe support plate, 2 is the upper bracket hanging plate, 3 is the upper connecting pipe, 4 is the upper supporting steel pipe, 5 is the upper connecting plate, 6 is the lower cooling main pipe support mechanism, 7 is the lower connecting pipe, 8 is the lower connecting pipe support mechanism, 9 is the foundation positioning base plate, 10 is the upper cooling main pipe, 11 is the grounding nut, 12 is the grounding wire, 13 is the lower connecting plate, 14 is the lower supporting steel pipe, 15 is the lower bracket hanging plate, 16 is the lower cooling main pipe, 17 is the upper cooling connecting pipe, 18 is the lower cooling connecting pipe, 19 is the lower connecting pipe support steel pipe, and 20 is the sheet metal. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0016] like Figure 1-4 As shown, an A-shaped support frame includes an upper support module and a lower support module that are detachably connected. The upper support module is A-shaped, and the lower support module is H-shaped (narrower at the top and wider at the bottom). The lower end of the upper support module and the upper end of the lower support module are detachably fixed together by fastening bolts. The longest dimension of the upper and lower support modules is ≤3 meters. Taking a 220kV transformer split cooling system as an example, after adopting the A-shaped support frame of this utility model, a project that originally required two 17-meter transport vehicles now only needs one. Based on a one-way distance of 1500 kilometers and a freight cost of 8.5 yuan / km for a 17-meter truck, the savings are 1500 × 8.5 × 1 = 12750 yuan. The upper and lower support modules can be stacked inside a 17-meter transport vehicle, doubling the loading capacity per vehicle.

[0017] The upper support module includes: an upper cooling main pipe support plate 1, an upper support hanging plate 2, an upper connecting pipe 3, an upper support steel pipe 4, an upper connecting plate 5, a grounding nut 11, and a grounding wire 12. The two upper support steel pipes 4 are the main load-bearing components of the upper support module. They can be made of Q235B ordinary carbon steel pipes with an outer diameter ≥165mm, a wall thickness ≥4mm, a yield strength of 235MPa, and a tensile strength of 375-500MPa. The upper ends of the two upper support steel pipes 4 are fixedly connected (preferably welded) to the lower surface of the upper cooling main pipe support plate 1. The upper cooling main pipe support plate 1 is used to fix and support the upper cooling main pipe 10 of the cooling system. The lower ends of the two upper support steel pipes 4 are inclined outwards. The lower middle parts of the two upper support steel pipes 4 are fixedly connected (preferably welded) to both ends of the horizontally oriented upper connecting pipe 3. The upper connecting pipe 3 is used for lateral support of the upper support module. The lower ends of the two upper support steel pipes 4 are fixedly connected (preferably welded) to the upper surface of the upper connecting plate 5. The upper connecting plate 5 is the core component of the modular splicing connection and is used for detachable connection to the upper end of the lower support module. The upper support hanging plate 2 is symmetrically welded to the outer side of the middle of the two upper support steel pipes 4. A lifting hole is opened at the center of the upper support hanging plate 2. The upper support hanging plate 2 is used for overall hoisting of the upper support module. The symmetrical distribution of the lifting holes can improve the safety and stability of the hoisting.

[0018] The upper cooling main pipe support plate 1 is also equipped with grounding nuts 11. A pair of grounding nuts 11 are symmetrically welded to the upper and lower surfaces of the upper cooling main pipe support plate 1, respectively. The grounding nuts 11 serve as the grounding connection points for the A-shaped bracket. The two ends of the grounding wire 12 are welded to the pair of grounding nuts 11 as a single unit. The grounding wire 12 is then connected to the grounding grid through a grounding lead, achieving safe grounding of the A-shaped bracket and avoiding the risk of static electricity accumulation and leakage. The connection between the grounding nuts 11 and the grounding wire 12 must comply with the requirements of DL / T 475-2017 "Guidelines for Measurement of Power Frequency Characteristic Parameters of Grounding Devices".

[0019] The lower support module includes: a lower cooling main pipe support mechanism 6, a lower connecting pipe 7, a lower connecting pipe support mechanism 8, a foundation positioning base plate 9, a lower connecting plate 13, lower support steel pipes 14, and a lower support hanging plate 15. The two lower support steel pipes 14 are the main load-bearing components of the lower support module. They can be made of Q235B ordinary carbon steel pipes with an outer diameter ≥165mm, a wall thickness ≥4mm, a yield strength of 235MPa, and a tensile strength of 375-500MPa. The upper ends of the two lower support steel pipes 14 are fixedly connected (preferably welded) to the lower surface of the lower connecting plate 13. The lower connecting plate 13 is the core component for modular splicing. The lower connecting plate 13 and the upper connecting plate 5 are detachably fixedly connected by fastening bolts. Corresponding elongated mounting holes can be opened on the lower connecting plate 13 and the upper connecting plate 5. These elongated mounting holes provide convenience for installation and ensure an installation error ≤±2mm. The fastening bolts at the connection between the lower connecting plate 13 and the upper connecting plate 5 are preferably 8.8 grade high-strength bolts.

[0020] The lower ends of the two lower support steel pipes 14 are fixedly connected (preferably welded) to both ends of the lower connecting pipe 7. The lower connecting pipe 7 is used for lateral support of the lower support module. Lower support hanging plates 15 are symmetrically welded to the outer sides of the middle of the two lower support steel pipes 14. A second lifting hole is provided at the center of the lower support hanging plate 15, which is used for overall hoisting of the lower support module. The lower ends of the two lower support steel pipes 14 are fixedly connected (preferably welded) to the upper surface of the foundation positioning plate 9. The foundation positioning plate 9 is fixed to the ground with anchor bolts, achieving overall fixed installation of the A-shaped support.

[0021] A lower cooling main pipe support mechanism 6 is fixedly installed (preferably welded) above the lower connecting pipe 7. The lower cooling main pipe support mechanism 6, together with the lower cooling main pipe support component, reliably supports the lower cooling main pipe 16. A lower connecting pipe support mechanism 8 is fixedly installed (preferably welded) below the lower connecting pipe 7. The lower connecting pipe support mechanism 8 supports the lower connecting pipe 7. The lower cooling main pipe support mechanism 6 includes a pair of vertical support plates symmetrically welded to the upper arc surface of the lower connecting pipe 7 and a lower cooling main pipe support plate. The top ends of the pair of vertical support plates are welded to the lower surface of the lower cooling main pipe support plate in the horizontal direction. The lower cooling main pipe support plate is bolted to the lower cooling main pipe support component, which is used to support and fix the lower cooling main pipe 16. The lower connecting pipe support mechanism 8 includes a pair of vertical support plates symmetrically welded to the lower arc surface of the lower connecting pipe 7 and a lower connecting pipe support plate. The bottom ends of the pair of vertical support plates are welded to the upper surface of the lower connecting pipe support plate in the horizontal direction. The center of the lower surface of the lower connecting pipe support plate is welded to the upper end of the lower connecting pipe support steel pipe 19. The lower end of the lower connecting pipe support steel pipe 19 is fixedly connected (preferably welded) to the upper surface of the foundation positioning base plate 9. The foundation positioning base plate 9 is fixedly installed on the ground by anchor bolts. The weld joints between the vertical support plates and the lower connecting pipe 7 are single-sided fillet welds with a weld leg height ≥6mm. After welding, the weld slag is removed and rust prevention treatment is performed. After welding, 100% visual inspection is required to ensure compliance with the requirements of DL / T 678-2023 "General Technical Conditions for Welding of Power Steel Structures".

[0022] Furthermore, the dimensions of the foundation positioning base plate 9 are ≥280mm×280mm×25mm, and the spacing error of the anchor bolt holes is ≤±2mm to ensure the accuracy of foundation installation. In the A-frame bracket, all steel structural components are made of Q235B carbon steel.

[0023] Several heat dissipation plates 20 are the core heat dissipation components of the cooling system. The upper end of the heat dissipation plate 20 is connected to the upper cooling main pipe 10, and the lower end of the heat dissipation plate 20 is connected to the lower cooling main pipe 16. The upper cooling main pipe 10 is connected to the oil tank through the upper cooling connecting pipe 17, and the lower cooling main pipe 16 is connected to the oil tank through the lower cooling connecting pipe 18. The transformer oil is cooled by oil circulation. The A-shaped bracket provides reliable support for the upper cooling main pipe 10 and the lower cooling main pipe 16, which improves the safety and stability of the transformer cooling system.

[0024] After the A-frame bracket is transported to the site, the upper and lower bracket modules are aligned on a leveled surface. High-strength (Grade 8.8) bolts are inserted into the elongated mounting holes of the upper connecting plate 5 and the lower connecting plate 13, and tightened diagonally to ensure a tight seal at the joint and prevent rainwater intrusion. The assembled A-frame bracket is then hoisted into place, and the foundation positioning plate 9 is fixed to the substation foundation ground using anchor bolts. Adjustments are made to ensure the A-frame bracket reliably supports the upper cooling header 10 and the lower cooling header 16. Finally, grounding is completed using the grounding nut 11 and the grounding wire 12.

[0025] In this embodiment of the utility model, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0026] Finally, it should be noted that the above embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model.

Claims

1. An A-shaped bracket, comprising a detachably connected upper bracket module and a lower bracket module, characterized in that, The upper support module is A-shaped, and the lower support module is H-shaped with a narrow top and a wide bottom. The upper support module includes an upper cooling mother pipe support plate (1) located at the top in the horizontal direction and an upper connecting pipe (3) located in the middle, as well as an upper connecting plate (5) located at the bottom. A pair of grounding nuts (11) are welded on the upper cooling mother pipe support plate (1), and the two ends of the grounding wire (12) are welded to the pair of grounding nuts (11). The lower support module includes a lower connecting pipe (7) located in the middle in the horizontal direction and a base positioning plate (9) located at the bottom, as well as a lower connecting plate (13) located at the top. Corresponding elongated mounting holes are opened on the lower connecting plate (13) and the upper connecting plate (5). A lower cooling mother pipe support mechanism (6) is set above the middle of the lower connecting pipe (7).

2. The A-shaped bracket according to claim 1, characterized in that, The upper support module also includes two upper support steel pipes (4). The upper ends of the two upper support steel pipes (4) are fixedly connected to the upper cooling mother pipe support plate (1). The lower ends of the two upper support steel pipes (4) are inclined to the two sides. The middle and lower parts of the two upper support steel pipes (4) are fixedly connected to both ends of the upper connecting pipe (3). The lower ends of the two upper support steel pipes (4) are fixedly connected to the upper connecting plate (5).

3. An A-shaped bracket according to claim 2, characterized in that, Two upper support steel pipes (4) are symmetrically welded to the outer side of the middle of the upper support hanging plate (2), and a hanging hole is opened at the center of the upper support hanging plate (2).

4. An A-shaped bracket according to claim 1, characterized in that, The lower support module also includes two lower support steel pipes (14). The upper ends of the two lower support steel pipes (14) are fixedly connected to the lower connecting plate (13). The lower ends of the two lower support steel pipes (14) are inclined to the two sides. The middle and lower parts of the two lower support steel pipes (14) are fixedly connected to the two ends of the lower connecting pipe (7). The lower ends of the two lower support steel pipes (14) are fixedly connected to the foundation positioning base plate (9).

5. An A-shaped bracket according to claim 4, characterized in that, A lower cooling main pipe support mechanism (6) is fixedly installed above the lower connecting pipe (7). The cooling main pipe support mechanism (6) includes a pair of vertical support plates symmetrically welded to the arc surface of the lower connecting pipe (7). The top of the pair of vertical support plates is welded to the lower surface of the lower cooling main pipe support plate in the horizontal direction.

6. An A-shaped bracket according to claim 5, characterized in that, A lower connecting pipe support mechanism (8) is fixedly installed below the lower connecting pipe (7). The lower connecting pipe support mechanism (8) includes a pair of vertical support plates symmetrically welded to the lower arc surface of the lower connecting pipe (7). The bottom ends of the pair of vertical support plates are welded to the upper surface of the lower connecting pipe support plate in the horizontal direction.

7. An A-shaped bracket according to claim 6, characterized in that, The lower surface center of the lower connecting pipe support plate is welded to the upper end of the lower connecting pipe support steel pipe (19), and the lower end of the lower connecting pipe support steel pipe (19) is fixedly connected to the foundation positioning base plate (9).

8. An A-shaped bracket according to claim 7, characterized in that, Two lower support steel pipes (14) are symmetrically welded to the outer side of the middle section of the lower support hanging plate (15), and two lifting holes are opened at the center of the lower support hanging plate (15).

9. A transformer cooling system, characterized in that, The application of the A-shaped bracket as described in claim 1 includes several fins (20). The upper end of the fins (20) is connected to the upper cooling main pipe (10), and the lower end of the fins (20) is connected to the lower cooling main pipe (16). The upper cooling main pipe (10) is connected to the oil tank through the upper cooling connecting pipe (17), and the lower cooling main pipe (16) is connected to the oil tank through the lower cooling connecting pipe (18). The upper cooling main pipe (10) is installed above the upper cooling main pipe support plate (1), and the lower cooling main pipe (16) is installed above the lower cooling main pipe support mechanism (6).

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