CN105575620B - Energy saving transformer - Google Patents

Abstract

The invention provides an energy-saving transformer, which comprises a shell, wherein radiating fins are distributed on the peripheral wall of the shell, transformer oil is filled in the shell, and an iron core formed by stacking silicon steel sheets is fixed in the shell; an iron core box surrounded by a heat-conducting wall is surrounded outside the iron core; and each heat conducting wall of the iron core box is a one-way flow-through wall, wherein the flow direction of the two heat conducting walls parallel to the silicon steel sheet is from the inside of the iron core box to the outside of the iron core box; the circulation direction of the other four heat conducting walls is from the outside of the iron core box to the inside of the iron core box. The energy-saving transformer can keep the internal transformer oil flowing, so that the transformer has excellent heat dissipation performance, and is simple in structure and low in cost.

Description

Energy saving transformer

technical field

The invention relates to the field of power facilities, in particular, to a power transformer.

Background technique

For outdoor power transformers, oil-immersed transformers are mainly used at present. The internal iron core is soaked in transformer oil. The iron core and winding are kept at a lower temperature, thereby prolonging the life of the transformer, improving the efficiency of the transformer, and saving energy. For most of the current power transformers, the internal transformer oil is still, and the heat can only be conducted to the heat sink of the shell by the natural convection inside the transformer oil. The heat conduction efficiency is obviously slow; therefore, for some large-capacity transformers, there is also a The oil circuit circulation system keeps the transformer oil flowing inside the transformer to obtain the effect of forced convection, which greatly promotes the heat dissipation of the transformer; however, the current forced convection mechanism of transformer oil is generally driven by a circulating pump, which not only greatly increases the The structure is complex, and it is not conducive to the full sealing of transformer oil, which greatly increases the overall cost, so it is not suitable for use in ordinary power transformers.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide an energy-saving transformer, which can not only keep the internal transformer oil flowing, make the transformer have excellent heat dissipation performance, but also has a simple structure and low cost.

A technical solution adopted by the present invention to achieve the technical purpose is: the energy-saving transformer includes a housing, the surrounding wall of the housing is distributed with cooling fins, the inside of the housing is filled with transformer oil, and the inside of the housing is fixed with an iron core formed by stacking silicon steel sheets; The iron core is surrounded by an iron core box surrounded by heat-conducting walls; and each heat-conducting wall of the iron core box is a one-way flow wall, wherein the two heat-conducting walls parallel to the silicon steel sheet flow through The direction is from the inside of the core box to the outside of the core box; the flow direction of the other four heat-conducting walls is from the outside of the core box to the inside of the core box.

Preferably, the heat conduction wall includes a fixed porous plate, a movable porous plate, and a fixed mesh plate parallel to each other; the through holes on the surface of the fixed porous plate and the movable porous plate are staggered from each other; A support spring is provided, and in a natural state, the support spring pushes the movable porous plate against the surface of the fixed porous plate; so that the liquid can flow from the side of the fixed porous plate to the side of the fixed mesh plate under pressure, and cannot flow from the fixed mesh side. The plate side flows to the stationary perforated plate side. Further, the fixed porous plate and the movable porous plate are both composed of copper or aluminum plates with a thickness of 0.2 mm to 0.5 mm, and have good thermal conductivity.

Another technical solution adopted by the present invention to achieve the technical purpose is: the energy-saving transformer includes a casing, the surrounding wall of the casing is distributed with cooling fins, the inside of the casing is filled with transformer oil, and an iron core made of silicon steel sheets is fixed inside the casing ; The iron core is surrounded by an iron core box surrounded by heat conduction walls; and each heat conduction wall of the iron core box has the following characteristics: under the same pressure condition, the amount of liquid flowing from the heat conduction wall A side to the B side It is greater than the amount of liquid flowing from side B to side A; the side A of the two heat conduction walls parallel to the silicon steel sheet faces inside the core box; the side A of the other four heat conduction walls faces outside the core box.

Preferably, the heat conduction wall is made of a metal plate densely covered with conical punching holes; the punching direction of each of the conical punching holes is the same; the large mouth end of the conical punching holes forms the first side of the heat conduction wall , the small mouth end constitutes the second side of the heat-conducting wall.

The beneficial effect of the present invention is that: when the above two kinds of energy-saving transformers are working, since the magnetic current in each silicon steel sheet of the iron core alternates continuously at the frequency of alternating current, the gravitational force between each silicon steel sheet continuously alternates, resulting in silicon steel sheets The plate vibrates continuously in the transverse direction; this kind of vibration is transmitted outward with the transformer oil as the medium, so that an alternating pressure is formed inside the transformer oil. Due to the characteristics of the heat conduction wall, in the positive half cycle of the alternating pressure, the core box The transformer oil in the transformer shell flows into the transverse area relative to the silicon steel sheet in the transformer shell through the heat conduction wall parallel to the silicon steel sheet, while the transformer oil in the longitudinal area in the transformer shell flows into the core box through the heat conduction wall not parallel to the silicon steel sheet; and In the negative half cycle of alternating pressure, it is difficult for the transformer oil to flow into the core box through the heat conduction wall parallel to the silicon steel sheet, so that the transformer oil in the core box is basically static; it can be seen that when this type of transformer is working, the iron core The flow direction of the transformer oil inside and outside the box is unidirectional, that is, it always flows out from the horizontal direction of the iron core box and flows in from the longitudinal direction of the iron core box, so that the transformer oil inside and outside the iron core box forms a stable circulation, resulting in forced convection ; thereby promoting heat dissipation and improving power transformation efficiency; in addition, the transformer noise generated by the vibration of the silicon steel sheet is converted into the kinetic energy of the circulating current in large quantities, so that the noise is significantly weakened and has a good environmental protection effect.

Description of drawings

Fig. 1 is a schematic longitudinal sectional view of Embodiment 1 of the energy-saving transformer.

Fig. 2 is a schematic structural diagram of the heat conducting wall in Embodiment 1 of the energy-saving transformer.

Fig. 3 is a schematic longitudinal sectional view of Embodiment 2 of the energy-saving transformer.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention is further described:

Embodiment one:

In the first embodiment shown in Fig. 1 and Fig. 2, the energy-saving transformer includes a housing 1, the surrounding wall of the housing 1 is distributed with cooling fins 11, the inside of the housing is filled with transformer oil, and the inside of the housing 1 is fixed with silicon steel sheets. The iron core 2; the iron core 2 is surrounded by an iron core box 3 surrounded by heat-conducting walls; and each heat-conducting wall of the iron core box 3 is a one-way flow wall, and the silicon steel sheet The flow direction of the two parallel heat-conducting walls is from the inside of the core box 3 to the outside of the core box 3; the flow direction of the other four heat-conducting walls is from the outside of the core box to the inside of the core box.

In the first embodiment, the heat-conducting wall, as shown in Figure 2, includes a fixed porous plate 311, a movable porous plate 312, and a fixed mesh plate 313 parallel to each other; the through holes on the surface of the fixed porous plate 311 and the movable porous plate 312 Stagger each other; the fixed porous plate 311 and the fixed mesh plate 313 are fixed relative to the housing 1; a support spring 314 is provided between the movable porous plate 312 and the fixed mesh plate 313. In a natural state, the support spring 314 Put the movable porous plate 312 on the surface of the fixed porous plate 311; according to this structure, the liquid can push the movable porous plate 312 from the side of the fixed porous plate 311 under pressure, thereby passing between the fixed porous plate 311 and the movable porous plate 312. The gaps, and the through holes on the movable porous plate 312 flow to the fixed mesh plate 313 side, but the liquid cannot flow from the fixed mesh plate 313 side to the fixed porous plate 311 side; thereby realizing the one-way flow function. Both the fixed porous plate 311 and the movable porous plate 312 are composed of copper or aluminum plates with a thickness of 0.2 mm to 0.5 mm, and have good thermal conductivity.

When the above-mentioned energy-saving transformer is in operation, since the magnetic current in each silicon steel sheet of the iron core 2 alternates continuously at the frequency of alternating current, the gravitational force between each silicon steel sheet continuously alternates, resulting in continuous lateral vibration of the silicon steel sheet; The transformer oil is used as the medium to transmit outward, so that the inside of the transformer oil forms an alternating pressure. Due to the one-way flow characteristics of the heat conduction wall, the transformer oil in the core box 3 passes through the positive half cycle of the alternating pressure. The heat conduction wall parallel to the silicon steel sheet flows into the transverse area of the transformer shell relative to the silicon steel sheet, while the transformer oil in the longitudinal area of the transformer shell 1 flows into the core box 3 through the heat conduction wall not parallel to the silicon steel sheet; In the negative half cycle of variable pressure, the transformer oil cannot flow into the core box 3 through the heat conduction wall parallel to the silicon steel sheet, so that the transformer oil in the core box 3 is basically static; it can be seen that when this type of transformer is working, the iron core The flow direction of the transformer oil inside and outside the box 3 is unidirectional, that is, it always flows out from the horizontal direction of the core box 3 and flows in from the longitudinal direction of the core box 3, so that the transformer oil inside and outside the core box 3 forms a stable circulation, As indicated by the dotted arrow in Fig. 1, forced convection is caused; thereby promoting heat dissipation and improving power conversion efficiency; in addition, the transformer noise generated by the vibration of the silicon steel sheet is converted into the kinetic energy of the circulation in a large amount, so that the noise can be obtained Obvious weakening, has a good environmental protection effect.

Embodiment two:

In the second embodiment shown in FIG. 3 , the energy-saving transformer includes a housing 1 with cooling fins 11 distributed on the surrounding wall of the housing. The inside of the housing 1 is filled with transformer oil, and an iron core 2 made of silicon steel sheets is fixed inside the housing. ; The iron core 2 is surrounded by an iron core box 3 surrounded by heat-conducting walls; The punching directions of the holes are the same; like this, under the same pressure condition, the amount of liquid flowing from the large mouth end of the conical punching hole to the small mouth end will be significantly greater than the liquid amount flowing from the small mouth end to the large mouth end; The side where it is located is the side A of the heat-conducting wall, and the side where the small opening is located is the side B of the heat-conducting wall; then in the second embodiment, the side A of the two heat-conducting walls parallel to the silicon steel sheet faces the inside of the core box 3; The first sides of the four heat-conducting walls face outside the iron core box 3 . The principle is similar to that of Embodiment 1. After offsetting the flow of transformer oil flowing from the small mouth end of the tapered hole to the large mouth end, the transformer oil inside and outside the iron core box 3 in Embodiment 2 will also form the circulation shown by the dotted line; compared with the implementation Example 1 and Embodiment 2 have a simpler structure and lower cost.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (2)

1. An energy-saving transformer, comprising a housing (1), the surrounding wall of the housing (1) is distributed with cooling fins (11), the inside of the housing (1) is filled with transformer oil, and the inside of the housing is fixed with an iron plate formed by stacking silicon steel sheets. core (2); the core (2) is surrounded by a core box (3) surrounded by heat-conducting walls; and each heat-conducting wall of the core box (3) is a one-way flow wall, wherein , the flow direction of the two heat conduction walls parallel to the silicon steel sheet is from the inside of the core box (3) to the outside of the core box (3); the flow direction of the other four heat conduction walls is from the outside of the core box to the iron core Inside the box; it is characterized in that: the heat conduction wall includes a fixed porous plate (311), a movable porous plate (312), and a fixed mesh plate (313) parallel to each other; the fixed porous plate (311), the movable porous plate (312 The through holes on the surface of the ) are staggered; a support spring (314) is provided between the movable porous plate (312) and the fixed mesh plate (313), and in a natural state, the support spring (314) pushes the movable porous plate (312) is supported on the surface of the fixed porous plate (311); so that the liquid can flow from the side of the fixed porous plate (311) to the side of the fixed mesh plate (313) under pressure, but cannot flow from the side of the fixed mesh plate (313) to the fixed mesh plate (313) side. perforated plate (311) side. 2. The energy-saving transformer according to claim 1, characterized in that: the fixed porous plate (311) and the movable porous plate (312) are both composed of copper or aluminum plates with a thickness of 0.2mm~0.5mm.