CN1303624C

CN1303624C - Evaporation and cooling power transformer for electric engine

Info

Publication number: CN1303624C
Application number: CNB2004100706158A
Authority: CN
Inventors: 马兴凯; 陶晓峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-23
Filing date: 2004-07-23
Publication date: 2007-03-07
Anticipated expiration: 2024-07-23
Also published as: CN1588588A

Abstract

The present invention relates to a vaporization and cooling power transformer of an electric locomotive, which belongs to the technical field of power network equipment. The power transformer comprises a condenser, a pressure vessel and a transformer body, wherein the condenser is communicated with the pressure vessel by an evaporating pipe and a liquid return pipe; cooling liquid is filled in the pressure vessel, and the transformer body is soaked in the cooling liquid. The power transformer of the present invention uses the transformer with a ring-shaped core in the field of the electric locomotive, which makes the power transformer for the electric locomotive simple in structure, and the auxiliary apparatus reduced. The transformer is cooled by utilizing the phase change cooling principle, and therefore, the cooling efficiency is high, and the heat transfer capacity of the unit cross-sectional area of a cooling pipeline between the condenser and the pressure vessel and the heat dissipation capacity of the unit surface area of the condenser are increased; the power density of the unit volume of the whole power transformer is increased. The power transformer has the advantages of high operational reliability, high safety, long service life and simple operational maintenance.

Description

Evaporation and cooling power transformer for electric engine

Technical field

The present invention relates to a kind of evaporation and cooling power transformer for electric engine, relate in particular to a kind of evaporative cooling power transformer that is applicable to electric locomotive and electric motor car group, belong to the power network equipment technical field.

Technical background

Main transformer on AC electric locomotive and the electric motor car group is to be used for the 25kV high-tension electricity on the contact line is reduced to the low tension with multiple voltage, to satisfy the vitals of the various motors of locomotive, electrical work needs.

Along with the requirement to main performances such as the hauling capacity of a locomotive and travel speeds constantly promotes, to having higher requirement of the indexs such as weight, volume and power loss of locomotive main transformer, therefore how weight reduction, reduced volume, reduce the wastage and electromagnetic interference becomes electric locomotive and electric motor car group design of transformer and makes key subjects.

So far electric locomotive and the main type of electric motor car group transformer are still oil-cooled transformer, but oil-cooled transformer has himself unsurmountable defective because with oil be coolant to take heat out of be limited, and easily right, oil strain, the expense of changing oil height.At present its improved technical method is considered from optimizing cooling oil circuit and radiator aspect mostly, with the further heat-sinking capability of improving, but to electric locomotive and electric motor car group transformer, the improvement of technical indicators such as its weight, volume, power loss and electromagnetic interference difficulty has bigger lifting.

Existing ring structure iron core transformer, its structure as shown in Figure 1, ring structure iron core has wherein made full use of the directivity of silicon steel sheet, thereby has reduced because of the inconsistent power loss that increases of magnetic circuit and silicon steel sheet orientation.Down long-pending at equal core section, the housing of ring structure iron core is the R type for four jiaos, and the junction that two " O " type sections are the semicircular internal frame body of ladder has two magnetic circuit do not had the triangular space of influence so the existing laminated core structure few 10～12% that is used for oil-cooled transformer of the weight ratio of ring structure iron core.And the slim silicon steel sheet of the processing technology of ring structure iron core employing preferably carries out, and slim silicon steel sheet has good characteristic of magnetization, thereby can reduce the eddy current loss of the iron core of converter.Ring structure iron core need not fastening integral body owing to self be one, improved the anti-short circuit capability of transformer, and the noise that when operation, only has only the magnetostrictive amplitude of silicon steel sheet to be produced, and laminated core structure also has from generation noises such as seam crossing and iron core clamping out-of-flatnesses, so the ring structure iron core noise of transformer is extremely low, can be called environment-friendly type " green transformer ".The ring structure iron core transformer has reduced unloaded excitatory power, has improved power factor, has reduced the electric network reactive-load loss, has improved the mains supply quality.

Though the ring structure iron core transformer has above-mentioned all structural advantages, this so far transformer also is not used in the electric locomotive field.

Summary of the invention

The objective of the invention is to propose a kind of evaporation and cooling power transformer for electric engine, change the structure of the existing transformer of electric locomotive and electric motor car group, existing ring structure iron core transformer with superior structural performance is used for the electric locomotive field, and with special cooling fluid, utilize the phase transformation cooling principle, the device body is cooled off, to alleviate the weight of whole electric locomotive transformer, dwindle its volume, reduce the power loss of electric locomotive.

The evaporation and cooling power transformer for electric engine that the present invention proposes, comprise condenser, pressure vessel and transformer body, described condenser is connected with pressure vessel by evaporation tube and liquid back pipe, be provided with cooling fluid in the pressure vessel, transformer body is immersed in the cooling fluid, and the boiling point of cooling fluid is-30 ℃～0 ℃.

The evaporation and cooling power transformer for electric engine that the present invention proposes, its characteristics and advantage are that existing annular core transformer is used for the electric locomotive field, make the simple in structure of use for electric locomotive power transformer, auxiliary equipment reduces.The cooling of transformer has utilized the phase transformation cooling principle, the cooling effectiveness height, thereby improved the thermal heat transfer capability of the cooling line unit cross-sectional area between condenser and the pressure vessel and the heat-sinking capability of condenser per surface area greatly, effectively improved the power density of whole power transformer unit volume.Link to each other by pipeline between pressure vessel in the power transformer and the condenser, can grow distance and separate, be convenient to the design and installation layout of equipment.This power transformer has high functional reliability, and fail safe is good, long service life, operation maintenance are simple.Compare with existing oil-filled transformer, therefore this power transformer in light weight significantly reduced equipment cost.

Description of drawings

Fig. 1 is the structural representation of existing ring structure iron core transformer.

Fig. 2 is the structural representation of the power transformer that designs of the present invention.

Among Fig. 1, the 1st, Transformer Winding binding post, the 2nd, interior ring iron core, the 3rd, outer shroud iron core, the 4th, Transformer Winding, the 5th, the annular core window, among Fig. 2, the 6th, condenser, the 7th, cooling fan, the 8th, evaporation tube, the 9th, vaporization chamber, the 10th, pressure vessel, the 11st, cooling fluid, the 12nd, liquid back pipe.

Embodiment

The evaporation and cooling power transformer for electric engine that the present invention proposes, its structure comprises condenser 6, pressure vessel 10 and transformer body as shown in Figure 2.Condenser 6 is connected with pressure vessel 10 by evaporation tube 8 and liquid back pipe 12, is provided with cooling fluid 11 in the pressure vessel 10, and transformer body is immersed in the cooling fluid 11, and the boiling point of cooling fluid is-30 ℃～0 ℃.

The operation principle of the evaporation and cooling power transformer for electric engine of the present invention's design is, the winding and unshakable in one's determination the immersion in the coolant of existing annular core transformer are cooled off, coolant absorbs heat from heaters such as winding and iron core surface and vaporizes, steam after the vaporization rises, enter condenser 6 from the vaporization chamber 9 on pressure vessel 10 tops by evaporation tube 8, flow back to pressure vessel 10 by liquid back pipe 12 after in condenser 6, being condensed into liquid.This phase transformation type of cooling makes the simple in structure of transformer, and the cooling of device body evenly.And the heat exchange efficiency height, cooling is significantly.

Used cooling fluid in the transformer of the present invention can be a dichlorodifluoromethane, and molecular formula is CF ₂Cl ₂, boiling point is-29.8 ℃, or the difluoro monochlorethane, molecular formula is C ₂H ₃F ₂Cl, boiling point are-9.25 ℃, or HFC-134a, and molecular formula is C ₂H ₂F ₄, boiling point is-26.5 ℃.

Transformer of the present invention, the temperature rise of cooling fluid thereby adopts transpiration-cooled transformer life to prolong greatly far below the temperature rise of existing oil-cooled transformer top layer oil in the pressure vessel.

Used ring structure iron core transformer in the transformer of the present invention can be the ring-like volume iron core of the serial three-phase non-excitation pressure adjustment of S11 (S11-M.R) distribution transformer of being produced by the auspicious transformer in capital, Beijing Manufacturing Co., Ltd (being called for short Jing Rui company).

Claims

1, a kind of evaporation and cooling power transformer for electric engine, it is characterized in that this transformer comprises condenser, pressure vessel and transformer body, described condenser is connected with pressure vessel by evaporation tube and liquid back pipe, be provided with cooling fluid in the pressure vessel, transformer body is immersed in the cooling fluid, and the boiling point of cooling fluid is-30 ℃～0 ℃.

2, power transformer as claimed in claim 1 is characterized in that wherein said cooling fluid is any in dichlorodifluoromethane, difluoro monochlorethane or the HFC-134a.