Oil-immersed transformer

Abstract

The utility model discloses an oil-immersed transformer which comprises a transformer shell, an installation cavity is formed in the transformer shell, a coil winding is fixedly installed in the installation cavity, a cooling cavity is formed in the transformer shell and located between the outer wall of the transformer shell and the inner wall of the installation cavity, and a cover plate is arranged on the top of the transformer shell. A plurality of cold water pipes are fixedly connected to the outer wall of the transformer shell, the two ends of each cold water pipe are connected with the cooling cavity, and a box body is arranged at the top of the cover plate. By combining the structural design of the oil-immersed transformer, the oil-immersed transformer is compact in structural design, small in occupied space and suitable for special installation environments, meanwhile, the cooling cavity and the circulating device are arranged, the circulating device drives liquid in the cooling cavity to circularly flow, liquid temperature drop can be effectively taken away through liquid circular flow, and the oil-immersed transformer can be used for oil-immersed transformer cooling. And the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to an oil-immersed transformer. Background Art

[0002] Oil-immersed transformers are important equipment used to change voltage and transfer electric energy in power systems. They are the basis for safe and economical operation of power grids. Oil-immersed transformers work mainly based on the principle of electromagnetic induction. On a closed iron core, there are two mutually insulated windings. The side connected to the power supply is called the primary winding, and the side that outputs electric energy is called the secondary winding. When the AC power supply voltage is applied to the primary winding, an AC current passes through the winding, generating an alternating magnetic flux in the iron core. This alternating magnetic flux not only passes through the primary winding, but also through the secondary winding, generating induced potentials E1 and E2 in the two windings respectively. At this time, if the secondary winding is connected to the load of the external circuit, current will flow into the load, that is, the secondary winding has electric energy output.

[0003] The existing oil-immersed transformers are relatively large in size. In special use environments, the installation space of the oil-immersed transformer cannot be met, thus affecting the normal operation of the power system. At the same time, when the transformer is overloaded, its core, winding and other components will generate a lot of heat, which will cause the oil temperature inside the oil tank to rise sharply. Since the oil will expand in volume after absorbing heat, it will affect the service life of the equipment. Summary of the invention

[0004] The purpose of the utility model is to provide an oil-immersed transformer to solve the problem that the existing oil-immersed transformer mentioned in the above background technology is relatively large in size. In special use environments, the installation space of the oil-immersed transformer cannot be met, thereby affecting the normal operation of the power system. At the same time, when the transformer is overloaded, its core, winding and other components will generate a large amount of heat, so that the oil temperature inside the oil tank will rise sharply. Since the oil will expand in volume after absorbing heat, the service life of the equipment will be affected.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an oil-immersed transformer, comprising a transformer housing, a mounting cavity is provided in the transformer housing, a coil winding is fixedly installed in the mounting cavity, a cooling cavity is provided in the transformer housing between the outer wall of the transformer housing and the inner wall of the mounting cavity, a cover plate is provided on the top of the transformer housing, a plurality of cold water pipes are fixedly connected to the outer wall of the transformer housing, and both ends of the cold water pipes are connected to the cooling cavity, and a box is provided on the top of the cover plate.

[0006] Preferably, an oil drain port is fixedly connected to the lower portion of the outer wall of the transformer housing, and the oil drain port is connected to the installation cavity.

[0007] Preferably, the lower portion of the exterior of the box is fixedly connected to one end of a support frame, and the other end of the support frame is fixedly connected to an outer wall of the transformer housing.

[0008] Preferably, one end of a liquid inlet pipe is fixedly connected to the bottom of the box body, the other end of the liquid inlet pipe is fixedly connected to a circulation device, and the circulation device is communicated with the cooling cavity.

[0009] Preferably, the circulation device is fixedly mounted on the top surface of the cover plate.

[0010] Preferably, a sealing device is fixedly connected to the bottom surface of the cover plate at a position relative to the cooling cavity.

[0011] Beneficial Effects

[0012] Compared with the existing technology, the beneficial effects of the utility model are:

[0013] Combined with the structural design of the utility model, the oil-immersed transformer has a compact structure and occupies a small volume, which is suitable for coping with special installation environments. At the same time, by providing a cooling chamber and a circulation device, the circulation device drives the liquid in the cooling chamber to circulate, and the liquid circulation can effectively take away the drop in oil temperature and increase the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the explosion structure of the utility model.

[0016] 1. Transformer housing; 2. Cover plate; 3. Cold water pipe; 4. Box; 5. Support frame; 6. Liquid inlet pipe;

[0017] 7. Circulation device; 8. Installation cavity; 9. Coil winding; 10. Cold water cavity; 11. Oil drain port; 12. Sealing device. DETAILED DESCRIPTION

[0018] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore are not to be construed as limiting the present invention. In addition, the terms "first", "second" and "third" are only used for descriptive purposes and are not to be construed as indicating or implying relative importance.

[0020] like Figure 1-2 It is a structural schematic diagram of an oil-immersed transformer in a preferred embodiment of the utility model. In this embodiment, an oil-immersed transformer includes a transformer housing 1, a mounting cavity 8 is opened in the transformer housing 1, a coil winding 9 is fixedly installed in the mounting cavity 8, a cooling cavity 10 is opened in the transformer housing 1 between the outer wall of the transformer housing 1 and the inner wall of the mounting cavity 8, and a coolant is filled in the cooling cavity 10. A cover plate 2 is arranged on the top of the transformer housing 1 to protect the coil winding 9 in the mounting cavity 8. A plurality of cold water pipes 3 are fixedly connected to the outer wall of the transformer housing 1, and both ends of the cold water pipes 3 are connected to the cooling cavity 10. This structural design uses the coolant to circulate and take away the oil temperature in the mounting cavity 8, and a box 4 is arranged on the top of the cover plate 2.

[0021] In this embodiment, an oil drain port 11 is fixedly connected to the lower part of the outer wall of the transformer housing 1 , and the oil drain port 11 is connected to the installation cavity 8 . This structural design facilitates the subsequent replacement of the oil inside the installation cavity 8 .

[0022] In this embodiment, the outer lower part of the box body 4 is fixedly connected to one end of the support frame 5 , and the other end of the support frame 5 is fixedly connected to the outer wall of the transformer housing 1 . This structural design plays a supporting role for the box body 4 .

[0023] In this embodiment, one end of the liquid inlet pipe 6 is fixedly connected to the bottom of the box body 4, and the other end of the liquid inlet pipe 6 is fixedly connected to a circulation device 7, and the circulation device 7 is communicated with the cooling chamber 10. Through this structural design, the circulation device 7 is used to circulate the coolant in the box body 4 and the cooling chamber 10. At the same time, during the circulation of the coolant in the box body 4 and the cooling chamber 10, the coolant will flow to the cooling pipe under the pressure of the circulation device 7. Since there are many cooling pipes, the outside temperature and wind are used to reduce the heat.

[0024] In this embodiment, the circulation device 7 is fixedly installed on the top surface of the cover plate 2 .

[0025] In this embodiment, the bottom surface of the cover plate 2 is located at a relative position to the cooling cavity 10 and is fixedly connected with a sealing device 12. This structural design effectively prevents the coolant in the cooling cavity 10 from intermixing with the oil in the installation cavity 8, and also increases the sealing between the cover body 2 and the transformer housing 1, effectively preventing impurities in the air from entering.

[0026] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. An oil-immersed transformer, comprising a transformer housing (1), characterized in that: The transformer housing (1) is provided with an installation cavity (8), a coil winding (9) is fixedly installed in the installation cavity (8), a cooling cavity (10) is provided in the transformer housing (1) between the outer wall of the transformer housing (1) and the inner wall of the installation cavity (8), a cover plate (2) is provided on the top of the transformer housing (1), a plurality of cold water pipes (3) are fixedly connected to the outer wall of the transformer housing (1), and both ends of the cold water pipes (3) are connected to the cooling cavity (10), and a box body (4) is provided on the top of the cover plate (2).

2. The oil-immersed transformer according to claim 1, characterized in that: An oil drain port (11) is fixedly connected to the lower portion of the outer wall of the transformer housing (1), and the oil drain port (11) is connected to the installation cavity (8).

3. The oil-immersed transformer according to claim 1, characterized in that: The outer lower portion of the box body (4) is fixedly connected to one end of a support frame (5), and the other end of the support frame (5) is fixedly connected to the outer wall of the transformer housing (1).

4. The oil-immersed transformer according to claim 3, characterized in that: One end of a liquid inlet pipe (6) is fixedly connected to the bottom of the box body (4), and the other end of the liquid inlet pipe (6) is fixedly connected to a circulation device (7), and the circulation device (7) is in communication with the cooling chamber (10).

5. The oil-immersed transformer according to claim 4, characterized in that: The circulation device (7) is fixedly mounted on the top surface of the cover plate (2).

6. The oil-immersed transformer according to claim 1, characterized in that: The bottom surface of the cover plate (2) is located at a relative position to the cooling cavity (10) and is fixedly connected with a sealing device (12).

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