Combined insulating cylinder and dry-type transformer

Abstract

The utility model discloses a combined insulating cylinder, which is used for a dry-type transformer and comprises a first insulating cylinder and a second insulating cylinder, the first insulating cylinder is coaxially sleeved with the second insulating cylinder, an annular boss is arranged on the outer cylinder wall of the first insulating cylinder, a protruding face of the annular boss protrudes in the direction away from the axis of the first insulating cylinder, and the protruding face of the annular boss is used for being attached to the inner cylinder wall of the second insulating cylinder. The convex surface of the annular boss is attached to the inner cylinder wall of the second insulating cylinder, so that air-cooled gas is prevented from flowing away between the first insulating cylinder and the second insulating cylinder, the utilization rate of the air-cooled gas is increased, and the heat dissipation performance of the dry-type transformer winding is further improved. The utility model further discloses a dry-type transformer applying the combined insulating cylinder.

Description

Technical Field

[0001] This utility model relates to the field of transformer insulation cylinder technology, and in particular to a combined insulation cylinder and a dry-type transformer. Background Technology

[0002] Dry-type transformers typically use a cylindrical insulated cylinder between the high-voltage and low-voltage coils to enhance insulation and prevent discharge from the high-voltage coil to the low-voltage coil, which could damage the transformer.

[0003] To meet the requirements of higher voltage or higher altitude, dry-type transformers typically have two or more independent insulating cylinders. This results in a significant portion of the cooling gas flowing out between the insulating cylinders when the dry-type transformer uses air cooling to dissipate heat from the coil windings, thus failing to effectively cool the coil windings. Utility Model Content

[0004] In view of this, the present invention provides a combined insulating cylinder, which has an annular protrusion on the first insulating cylinder for fitting against the wall of the second insulating cylinder, so as to prevent the air-cooled gas from flowing away from the first and second insulating cylinders and improve the heat dissipation effect of the dry-type transformer.

[0005] This utility model also provides a dry-type transformer including the above-mentioned combined insulating cylinder.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A combined insulating cylinder for use in a dry-type transformer includes: a first insulating cylinder and a second insulating cylinder;

[0008] The first insulating cylinder is coaxially fitted inside the second insulating cylinder. The outer wall of the first insulating cylinder is provided with an annular boss, and the protruding surface of the annular boss protrudes away from the axis of the first insulating cylinder. The protruding surface of the annular boss is used to fit against the inner wall of the second insulating cylinder.

[0009] Preferably, the raised surface is sealed and fitted to the inner wall of the second insulating cylinder.

[0010] Preferably, the space between the raised surface of the annular boss and the inner wall of the second insulating cylinder is filled with sealant.

[0011] Preferably, the annular boss is disposed on the top of the outer wall of the first insulating cylinder, and the top surface of the annular boss is aligned with the top surface of the first insulating cylinder.

[0012] Preferably, the axial length of the first insulating cylinder and the axial length of the second insulating cylinder are equal;

[0013] The top surface of the annular boss is aligned with the top surface of the second insulating cylinder.

[0014] Preferably, the axial length of the annular boss is 100 mm.

[0015] Preferably, the number of the first insulating cylinders is multiple;

[0016] Multiple first insulating cylinders are coaxially mounted in order of increasing diameter from the inside to the outside; the raised surface of the annular boss of one first insulating cylinder is attached to the inner wall of another first insulating cylinder, and the raised surface of the annular boss of the outermost first insulating cylinder is attached to the inner wall of the second insulating cylinder.

[0017] A dry-type transformer includes: the aforementioned combined insulating cylinder.

[0018] Preferably, it further includes: an upper pad block and a lower pad block;

[0019] The upper pad is used to support and press the top of the combined insulating cylinder, and the lower pad is used to support and press the bottom of the combined insulating cylinder.

[0020] Preferably, it further includes: an upper U-shaped support and a lower U-shaped support;

[0021] The connecting end of the first side rod of the upper U-shaped support is fixedly connected to the top of the low-voltage coil, and the connecting end of the second side rod of the upper U-shaped support passes through the upper pad and is fixedly connected to the top of the high-voltage coil; the side of the upper pad away from the closed end of the upper U-shaped support is used to support and press the top of the combined insulating cylinder.

[0022] The connecting end of the first side rod of the lower U-shaped support is fixedly connected to the bottom of the low-voltage coil, and the connecting end of the second side rod of the lower U-shaped support passes through the lower pad and is fixedly connected to the bottom of the high-voltage coil; the side of the lower pad away from the closed end of the lower U-shaped support is used to support and press the bottom of the combined insulating cylinder.

[0023] As can be seen from the above technical solution, the combined insulating cylinder provided by this utility model, through the convex surface of the annular boss and the inner wall of the second insulating cylinder, prevents the air-cooled gas from flowing out between the first and second insulating cylinders, improves the utilization rate of air-cooled gas, and thus enhances the heat dissipation performance of the dry-type transformer winding.

[0024] This utility model also provides a dry-type transformer. Due to the adoption of the above-mentioned combined insulating cylinder, it has corresponding beneficial effects, which can be referred to the previous description and will not be repeated here. Attached Figure Description

[0025] 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.

[0026] Figure 1 A schematic diagram of the overall structure of the combined insulating cylinder provided in this embodiment of the utility model;

[0027] Figure 2 A cross-sectional view of the combined insulating cylinder provided in an embodiment of this utility model (section lines omitted).

[0028] Figure 3 for Figure 2 A cross-sectional view from the perspective of AA;

[0029] Figure 4 This is a schematic diagram of the structure of the first insulating cylinder;

[0030] Figure 5 This is an isometric structural diagram of the dry-type transformer provided in the embodiment of this utility model.

[0031] Wherein, 1 is the first insulating cylinder, 11 is the annular boss, and 111 is the raised surface;

[0032] 2 is the second insulating cylinder;

[0033] 3 is the upper pad; 4 is the lower pad.

[0034] 5 is the upper U-shaped support; 6 is the lower U-shaped support. Detailed Implementation

[0035] 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 protection scope of the present utility model.

[0036] The combined insulating cylinder provided in this embodiment of the utility model is used in dry-type transformers, such as... Figures 1-5 As shown, it includes: a first insulating cylinder 1 and a second insulating cylinder 2;

[0037] The first insulating cylinder 1 is coaxially fitted inside the second insulating cylinder 2. The outer wall of the first insulating cylinder is provided with an annular boss 11, and the raised surface 111 of the annular boss 11 protrudes in a direction away from the axis of the first insulating cylinder 1. The raised surface 111 of the annular boss 11 is used to fit against the inner wall of the second insulating cylinder 2.

[0038] In the above technical solution, during the operation of the dry-type transformer, the high-voltage coil and the low-voltage coil generate heat. The surface of the high-voltage coil and the low-voltage coil is cooled by the air-cooling system (the air-cooling system blows from the bottom of the dry-type transformer upwards or from the top of the dry-type transformer downwards). In traditional insulation cylinders, there are large gaps between them, which causes a large portion of the air-cooling gas to flow away from between the insulation cylinders, failing to effectively cool the transformer coil windings. In this technical solution, by setting the annular boss 11, and the raised surface 111 of the annular boss 11 is attached to the inner wall of the second insulation cylinder 2, the gap between adjacent insulation cylinders (here, the insulation cylinder refers to the insulation cylinder without the annular boss 11, as shown in the structure of the second insulation cylinder 2) is greatly reduced, preventing a large portion of the gas from flowing away from the gap between the insulation cylinders.

[0039] Compared with the prior art, this technical solution improves the utilization rate of air-cooled gas by having the raised surface 111 of the annular boss 11 and the inner wall of the second insulating cylinder 2 fit together, thereby preventing the air-cooled gas from flowing out between the first insulating cylinder 1 and the second insulating cylinder 2, and thus improving the heat dissipation performance of the dry-type transformer winding.

[0040] By optimizing the above technical solution, the raised surface 111 is sealed and fitted to the inner wall of the second insulating cylinder 2. This can be understood as ensuring that there is no gap between the raised surface 111 and the inner wall of the second insulating cylinder 2. Through this arrangement, the air-cooled gas is completely blocked and cannot flow between the first insulating cylinder 1 and the second insulating cylinder 2, further improving the heat dissipation performance of the dry-type transformer winding.

[0041] To further optimize the above technical solution, sealant is filled between the raised surface 111 of the annular boss 11 and the inner wall of the second insulating cylinder 2, and the sealant is used to seal the gap between the first insulating cylinder 1 and the second insulating cylinder 2; preferably, the sealant is silicone sealant.

[0042] In this technical solution, such as Figure 2 and Figure 3 As shown, the annular boss 11 is disposed on the top of the outer wall of the first insulating cylinder 1, and the top surface of the annular boss 11 is aligned with the top surface of the first insulating cylinder (that is, the top surface of the annular boss 11 and the top surface of the first insulating cylinder are located on the same horizontal plane).

[0043] In the above technical solution, a cavity is formed between the bottom surface of the annular boss 11, the outer wall of the first insulating cylinder 1, and the second insulating cylinder 2. Openings are formed at the bottom of the first insulating cylinder 1 and the bottom of the second insulating cylinder 2. Therefore, the cavity is a U-shaped cavity. Figure 3 As shown, the air-cooled gas can enter from the opening end of the U-shaped cavity, but due to the setting of the annular boss 11, a flow channel for the air-cooled gas cannot be formed, thus avoiding the loss of air-cooled gas. In the above solution, by providing the annular boss 11 only on the top of the outer cylinder wall of the first insulating cylinder 1, materials can be saved, and the overall structure of the first insulating cylinder 1 can be ensured. It should be noted that the annular boss 11 can be set at the bottom or the middle of the outer cylinder wall of the first insulating cylinder 1. In one embodiment, the annular boss 11 of the first insulating cylinder 1 can be set at the top, middle or bottom of the first insulating cylinder 1 at the same time. In another embodiment, the annular boss 11 can be set at the top, middle or bottom of the inner cylinder wall of the first insulating cylinder 1.

[0044] Optimize the above technical solutions, such as Figure 2 and Figure 3 As shown, the axial length of the first insulating cylinder 1 and the axial length of the second insulating cylinder 2 are equal.

[0045] The top surface of the annular boss 11 is aligned with the top surface of the second insulating cylinder 2 (that is, the top surface of the annular boss 11 and the top surface of the second insulating cylinder 2 are on the same horizontal plane).

[0046] In the above technical solution, the top surface of the annular boss 11, the top surface of the second insulating cylinder, and the top surface of the second insulating cylinder are located on the same horizontal plane, and the bottom surface of the annular boss 11, the bottom surface of the second insulating cylinder, and the bottom surface of the second insulating cylinder are located on the same horizontal plane. This arrangement ensures the stability of the combined insulating cylinder structure and is conducive to the assembly of the combined insulating cylinder and other structures of the dry-type transformer.

[0047] In this technical solution, the axial length of the annular boss 11 is 100mm. This setting saves materials while ensuring the overall structural strength of the first insulating cylinder 1.

[0048] In this technical solution, such as Figures 1-4 As shown, there are multiple first insulating cylinders 1;

[0049] Multiple first insulating cylinders 1 are coaxially mounted in order of increasing diameter from small to large and from the inside to the outside; the raised surface 111 of the annular boss 11 of one adjacent first insulating cylinder 1 is attached to the inner wall of the other first insulating cylinder 1, and the raised surface 111 of the annular boss 11 of the outermost first insulating cylinder 1 is attached to the inner wall of the second insulating cylinder 2.

[0050] In the above scheme, according to the needs of dry-type transformers, multiple first insulating cylinders 1 are set up, and the multiple first insulating cylinders 1 are nested in sequence. The outermost first insulating cylinder 1 has its outer wall fitted inside a second insulating cylinder 2. This arrangement prevents air-cooled gas from flowing between adjacent insulating cylinders, thus improving the heat dissipation performance of the dry-type transformer windings. Preferably, there are two first insulating cylinders 1 and one second insulating cylinder 2. Figure 3 As shown, the insulating cylinders are sequentially assembled.

[0051] This utility model also provides a dry-type transformer, including: the combined insulating cylinder as described above. Since this solution uses the aforementioned combined insulating cylinder, it has corresponding beneficial effects, as detailed in the preceding description, which will not be repeated here.

[0052] In the above technical solutions, such as Figure 5 As shown, it also includes: upper pad 3 and lower pad 4;

[0053] The upper pad 3 is used to support and press the top of the combined insulating cylinder, and the lower pad 4 is used to support and press the bottom of the combined insulating cylinder.

[0054] In the above technical solution, the use of spacers ensures the overall stability of the dry-type transformer and improves the utilization rate of air-cooled gas. Furthermore, the axial length of the combined insulating cylinder is longer than that of the high- and low-voltage coils, further enhancing the utilization rate of air-cooled gas.

[0055] Optimize the above technical solutions, such as Figure 5 As shown, it also includes: an upper U-shaped support 5 and a lower U-shaped support 6;

[0056] The connecting end of the first side rod of the upper U-shaped support 5 is fixedly connected to the top of the low-voltage coil, and the connecting end of the second side rod of the upper U-shaped support 5 passes through the upper pad 3 and is fixedly connected to the top of the high-voltage coil; the side of the upper pad 3 away from the closed end of the upper U-shaped support 5 is used to support and compress the top of the combined insulating cylinder.

[0057] The connecting end of the first side rod of the lower U-shaped support 6 is fixedly connected to the bottom of the low-voltage coil, and the connecting end of the second side rod of the lower U-shaped support 6 passes through the lower pad 4 and is fixedly connected to the bottom of the high-voltage coil; the side of the lower pad 4 away from the closed end of the lower U-shaped support 6 is used to support and press the bottom of the combined insulating cylinder.

[0058] In the above technical solution, the upper U-shaped support 5 and the lower U-shaped support 6 are fixed between the high and low voltage coils, which makes the structure of this dry-type transformer more stable and helps to extend the service life of the combined insulation cylinder.

[0059] In one embodiment, there are multiple upper pads 3, which are stacked around the first side rod of the upper U-shaped support 5, and the bottom upper pad 3 is used to support and compress the combined insulating cylinder; there are multiple lower pads 4, which are stacked around the first side rod of the lower U-shaped support 6, and the top lower pad 4 is used to support and compress the combined insulating cylinder.

[0060] In one embodiment, the protrusion length of the annular boss 11 can be determined according to the actual assembly requirements, so as to ensure that the protruding surface 111 can fit and overlap the inner wall of the second insulating cylinder 2; the cylinder walls of the first insulating cylinder 1 and the second insulating cylinder 2 can be determined according to actual needs.

[0061] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0062] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined insulating cylinder for use in dry-type transformers, characterized in that, include: First insulating cylinder (1) and second insulating cylinder (2); The first insulating cylinder (1) is coaxially fitted inside the second insulating cylinder (2). The outer wall of the first insulating cylinder is provided with an annular boss (11), and the protruding surface (111) of the annular boss (11) protrudes in a direction away from the axis of the first insulating cylinder (1). The protruding surface (111) of the annular boss (11) is used to fit against the inner wall of the second insulating cylinder (2).

2. The combined insulating cylinder according to claim 1, characterized in that, The raised surface (111) is sealed and fitted to the inner wall of the second insulating cylinder (2).

3. The combined insulating cylinder according to claim 2, characterized in that, The space between the raised surface (111) of the annular boss (11) and the inner wall of the second insulating cylinder (2) is filled with sealant.

4. The combined insulating cylinder according to claim 1, characterized in that, The annular boss (11) is disposed on the top of the outer wall of the first insulating cylinder (1), and the top surface of the annular boss (11) is aligned with the top surface of the first insulating cylinder.

5. The combined insulating cylinder according to claim 4, characterized in that, The axial length of the first insulating cylinder (1) is equal to the axial length of the second insulating cylinder (2); The top surface of the annular boss (11) is aligned with the top surface of the second insulating cylinder (2).

6. The combined insulating cylinder according to claim 1, characterized in that, The axial length of the annular boss (11) is 100mm.

7. The combined insulating cylinder according to any one of claims 1-6, characterized in that, The number of the first insulating cylinder (1) is multiple; Multiple first insulating cylinders (1) are coaxially mounted in order of increasing diameter from small to large and from the inside to the outside; the raised surface (111) of the annular boss (11) of one first insulating cylinder (1) is attached to the inner wall of the other first insulating cylinder (1), and the raised surface (111) of the annular boss (11) of the outermost first insulating cylinder (1) is attached to the inner wall of the second insulating cylinder (2).

8. A dry-type transformer, characterized in that, include: The combined insulating cylinder as described in any one of claims 1-7.

9. The dry-type transformer according to claim 8, characterized in that, Also includes: Upper pad (3) and lower pad (4); The upper pad (3) is used to support and press the top of the combined insulating cylinder, and the lower pad (4) is used to support and press the bottom of the combined insulating cylinder.

10. The dry-type transformer according to claim 9, characterized in that, Also includes: Upper U-shaped support (5) and lower U-shaped support (6); The connecting end of the first side rod of the upper U-shaped support (5) is fixedly connected to the top of the low-voltage coil, and the connecting end of the second side rod of the upper U-shaped support (5) passes through the upper pad (3) and is fixedly connected to the top of the high-voltage coil; the side of the upper pad (3) away from the closed end of the upper U-shaped support (5) is used to support and press the top of the combined insulating cylinder. The connecting end of the first side rod of the lower U-shaped support (6) is fixedly connected to the bottom of the low-voltage coil, and the connecting end of the second side rod of the lower U-shaped support (6) passes through the lower pad (4) and is fixedly connected to the bottom of the high-voltage coil; the side of the lower pad (4) away from the closed end of the lower U-shaped support (6) is used to support and press the bottom of the combined insulating cylinder.

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