CN212230218U

CN212230218U - Dry-type transformer

Info

Publication number: CN212230218U
Application number: CN202021206476.8U
Authority: CN
Inventors: 郑坚勇; 王红雨; 陈秧秧
Original assignee: Zhejiang Lingao Electrical Industrial Co ltd
Current assignee: Zhejiang Lingao Electrical Industrial Co ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-12-25
Anticipated expiration: 2030-06-24

Abstract

The utility model provides a pair of dry-type transformer belongs to electrical element technical field, include: the high-voltage coil is sleeved on the outer surface of the low-voltage coil; a main air channel is arranged between the low-voltage coil and the high-voltage coil; an insulating cylinder is arranged in the main hollow channel; the linear distance from one side surface of the insulating cylinder close to the low-voltage coil is smaller than the linear distance from one side surface of the insulating cylinder close to the high-voltage coil; the utility model discloses a dry-type transformer when being close to the low-voltage coil setting with the insulating cylinder, has increased the distance between high-voltage coil and the insulating cylinder, and main air flue belongs to high-voltage coil's space increase promptly, has strengthened high-voltage coil's radiating effect, can reduce the quantity of the air flue that sets up in high-voltage coil, has reduced welded frequency, and the welding point reduces, has saved man-hour.

Description

Dry-type transformer

Technical Field

The utility model relates to an electrical element technical field, concretely relates to dry-type transformer.

Background

The dry type transformer refers to a transformer in which an iron core and a winding are not immersed in insulating oil. The coil structure of the dry-type distribution transformer is as follows: the low-voltage coil is foil-wound, namely, the low-voltage coil is wound by copper foils layer by layer; the high-voltage coil is wound in a segmented layer manner and is divided into 4 segments, 6 segments or 8 segments; the wires between the segments are connected by welding.

In order to meet the requirement of temperature rise, air passages are respectively arranged in low pressure and high pressure; meanwhile, a main air channel is arranged between the high voltage and the low voltage, and in order to meet the electrical performance requirement, an insulating cylinder is arranged between the main air channels and divides the main air channel into two independent air channels, one of the two air channels belongs to the low voltage coil, and the other air channel belongs to the high voltage coil.

However, when the air passage is arranged at high pressure, in the process of winding the coil, when each section of the wire reaches the number of layers of the air passage, the wire needs to be cut off and wound again after passing through the air passage, meanwhile, the two layers separated by the air passage need to be welded and connected again, welding points are greatly increased, labor hour is consumed, and meanwhile, higher requirements are put forward on welding requirements.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the air flue that sets up in high-tension coil among the prior art, leads to expending man-hour elongated defect to a dry-type transformer is provided.

In order to solve the above technical problem, the utility model provides a dry-type transformer, which comprises a low-voltage coil and a high-voltage coil sleeved on the outer surface of the low-voltage coil; a main air channel is arranged between the low-voltage coil and the high-voltage coil; an insulating cylinder is arranged in the main hollow channel;

the linear distance from one side surface of the insulating cylinder close to the low-voltage coil is smaller than the linear distance from one side surface of the insulating cylinder close to the high-voltage coil.

Preferably, the insulation cylinder is attached to the low-voltage coil on one side face close to the low-voltage coil.

Preferably, no air channel is arranged in the high-voltage coil.

Preferably, at least 2 air passages are arranged in the low-voltage coil.

Preferably, the upper end and the lower end of the insulating cylinder extend outwards towards the upper end and the lower end of the main channel respectively.

Preferably, both ends of the insulation cylinder are respectively 10-20mm higher than the coil in the axial direction.

Preferably, the thickness of the insulation cylinder is 1-3 mm.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a dry-type transformer, including low voltage coil and high-voltage coil, be provided with the main empty way between low voltage coil and the high-voltage coil, be provided with the insulating cylinder in the main empty way, the straight line distance that a side of the insulating cylinder near low voltage coil reachs the low voltage coil is less than the straight line distance that a side of the insulating cylinder near high-voltage coil reachs the high-voltage coil;

the air flue width is big more, and the radiating effect is better, so when being close to the low voltage coil setting with the insulating cylinder, increased the distance between high voltage coil and the insulating cylinder, main air flue belongs to high voltage coil's space increase promptly, has strengthened high voltage coil's radiating effect, can reduce the quantity of the air flue that sets up in high voltage coil, has reduced welded frequency, and the welding point reduces, has saved man-hour.

2. The utility model provides a dry-type transformer, the setting of insulating cylinder laminating low tension coil for main air flue is whole all to belong to high tension coil, reinforcing high tension coil's radiating effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a plan view of a coil structure of a dry type transformer according to the present invention.

Fig. 2 is a sectional view a-a shown in fig. 1.

Fig. 3 is a top view of a coil structure of a prior art dry type transformer.

Fig. 4 is a sectional view B-B shown in fig. 3.

Description of reference numerals:

1. a low-voltage coil; 2. a low pressure air passage; 3. a main empty way; 4. an insulating cylinder; 5. a high-voltage coil; 6. a high pressure air passage.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The dry-type transformer provided by the present embodiment, as shown in fig. 1 and 2, includes a low-voltage coil 1 and a high-voltage coil 5 sleeved on an outer surface of the low-voltage coil 1; a main hollow channel 3 is arranged between the low-voltage coil 1 and the high-voltage coil 5, an insulating cylinder 4 is arranged in the main hollow channel 3, and the linear distance from one side surface, close to the low-voltage coil 1, of the insulating cylinder 4 to the low-voltage coil 1 is smaller than the linear distance from one side surface, close to the high-voltage coil 5, of the insulating cylinder 4 to the high-voltage coil 5;

the bigger the air flue width is, the better the heat dissipation effect is, so when being close to low voltage coil 1 setting with insulating cylinder 4, increased the distance between high voltage coil 5 and the insulating cylinder 4, main air flue belongs to the space increase of high voltage coil 5 promptly, has strengthened high voltage coil 5's heat dissipation effect, can reduce the quantity of the air flue that sets up in high voltage coil 5, has reduced welded frequency, and the welding point reduces, has saved man-hour.

In the prior art, as shown in fig. 3 and 4, a main air passage 3 is arranged between a low-voltage coil 1 and a high-voltage coil 5, an insulating cylinder 4 is placed in the middle of the main air passage 3, the main air passage 3 is divided into two independent air passages by the insulating cylinder 4, and one part of the main air passage belongs to the low-voltage coil 1 and becomes a low-voltage air passage 2; the other part belongs to a high-voltage coil 5 and becomes a high-voltage air passage 6; because the width of the high-pressure air passage 6 cannot meet the heat dissipation requirement of the high-pressure coil 5, the high-pressure air passage 6 is also required to be separately arranged between the high-pressure coils 5; however, when the high-voltage air passage 6 is arranged in the high-voltage coil 5, in the process of winding the coil, when each section of the conducting wire reaches the number of layers of the air passage, the conducting wire needs to be cut off and wound again after passing through the air passage, the whole process is very complicated, and a large amount of working hours are consumed.

In order to solve the problems, in the scheme, the insulating cylinder 4 is arranged by being attached to the low-voltage coil 1, so that all the space of the main air channel 3 becomes the high-voltage air channel 6, the width of the high-voltage air channel 6 can meet the heat dissipation requirement of the high-voltage coil 5, the high-voltage air channel 6 is not arranged in the high-voltage coil 5, and the production process is simplified;

simultaneously, because main empty lane 3's space does not give low pressure coil 1, for satisfying low pressure coil 1's heat dissipation requirement, so need place a low pressure air flue 2 more in low pressure coil 1, place two low pressure air flues 2 in low pressure coil 1, because low pressure coil 1 is foil winding, even so set up the air flue, the winding process is also simpler, to increasing the air flue, to the man-hour that consumes, the influence is less.

The upper end and the lower end of the insulating cylinder 4 extend out of the main hollow channel 3, and the two ends of the insulating cylinder are respectively 10-20mm higher than the coil, preferably 15mm higher than the coil; the thickness of the insulating cylinder 4 is 1-3mm, preferably 2 mm.

Method of use and principles

Because the air flue width is wider more, the coefficient of heat dissipation is better, with the setting of insulating cylinder 4 laminating low pressure coil 1 for main air channel 3 all is used for high pressure coil 5's heat dissipation, satisfies high pressure coil 5's heat dissipation needs, makes need not to set up other high pressure air flue 6 again in high pressure coil 5, reduces the welding point, saves man-hour.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A dry-type transformer is characterized by comprising a low-voltage coil (1) and a high-voltage coil (5) sleeved on the outer surface of the low-voltage coil (1); a main air channel (3) is arranged between the low-voltage coil (1) and the high-voltage coil (5); an insulating cylinder (4) is arranged in the main hollow channel (3);

the straight line distance from one side surface, close to the low-voltage coil (1), of the insulating cylinder (4) to the low-voltage coil (1) is smaller than the straight line distance from one side surface, close to the high-voltage coil (5), of the insulating cylinder (4) to the high-voltage coil (5).

2. Dry transformer according to claim 1 whereas the insulation cylinder (4) is arranged close to one side of the low voltage coil (1) against the low voltage coil (1).

3. Dry transformer according to claim 2, whereas no air ducts are provided in the high voltage coil (5).

4. Dry transformer according to claim 3, whereas at least 2 gas ducts are provided in the low voltage coil (1).

5. Dry transformer according to any of claims 1-4 whereas the upper and lower ends of the insulation cylinder (4) extend outwards towards the upper and lower ends of the main channel (3), respectively.

6. Dry transformer according to claim 5, whereas the ends of the insulation cylinder (4) are raised 10-20mm above the coil in axial direction, respectively.

7. Dry transformer according to claim 6, whereas the insulation cylinder (4) has a thickness of 1-3 mm.