SU960975A1 - Transformer - Google Patents

Description

(5) TRANSFORMER

one

The invention relates to electrical engineering, in particular to explosion (valuable electrical equipment used in mines.

A transformer is known in which heat pipes D are used to cool the active part.

The closest technical solution to the invention is an explosion-proof transformer with a device for heat removal, containing an active part located inside the transformer case, a heat sink, forming elements made in the form of two parallel plates, one ends of which are placed between the cooled elements and the others corrugations of the housing of the transformer, with heat pipes between the parallel plates rigidly fastened to them 2.

The drawbacks of the well-known design are low reliability and durability, limited combinations of heat carrier materials — core, vacuum, due to ingress during refueling and the release of non-condensable gases during operation, coolant leaks through micropores, microcracks

5 or defects in welding, as well as the insufficient thermodynamic efficiency of the device for heat removal, due to the high thermal resistances of the heat dissipating Elements relative to the external fins of the casing.

The aim of the invention is to increase the thermodynamic efficiency of the transformer and its reliability.

15

Claims (2)

The goal is achieved by the fact that a transformer, mainly explosion-proof, containing an active part located inside the housing, heat pipes with an evaporator that contacts the active part and a condenser that contacts the cooling medium, is equipped with a buffer element with a heat-transfer fluid, evaporators and heat pipe condensers respectively, are connected by collectors, which i are connected to the buffer through inserts. Each element and each heat pipe are stepped, and the heat pipe capacitors are hermetically mounted on the transformer case from the outside, the inserts are made porous or in the form of overpressure valves. FIG. 1 shows the proposed transformer; in fig. 2 - heat pipe and winding section, cross section, Evaporators 1 heat pipes (Fig. 1 are connected by a collector 2. By analogy, hermetic fins - condensers 3 are combined by a collector A. Collectors 2 and C are through porous inserts 5 (in another version these are valves overpressure) are connected to the buffer element 6 containing the liquid heat carrier 7. The buffer element 6 contains an expanding part 8 with a viewing window 9 and a refueling valve 10. Each heat pipe is made stepwise, and the hollow fins of the condensers 3 are sealed On the cover C of the cover, when connected to the housing 12, inside which heat release elements are installed are winding sections 13 and magnetic conductor k, and winding sections 13 are in good thermal contact with heat pipe evaporation elements 1. The device works as follows. the occurrence of non-condensable gases (during refueling or operation) in the zone of condensers 3, gases are forced into the collector 4, from where through the porous insert (or valve) 5 enter the buffer element 6, creating liquid heat above the mirror itel 7 pressure, which ensures the return of the required mass of liquid to the main circuit through the porous insert (or valve) 5 through the collector 2 to the evaporators m. At the same time, the level in the expander 8 and the resistance of the lower porous insert 5 provide just the specified flow rate, Inspection The window 9 serves to control the presence of liquid in the buffer element 6. If necessary, the level is replenished through valve 10 with simultaneous removal of non-condensable gas gases from element 6. Thus, the question of compatibility of the material Rial of the case of heat pipes and heat carrier. At the same time, the insert 5 (or, respectively, the valves) ensure the autonomy of the main and buffer circuits. The device is operational and in the presence of micro-leaks in the main or buffer circuits. For example, the loss of the coolant in the main circuit, including evaporators 1, condensers 3 and collectors 2 and 4 (up to porous inserts 5) causes a decrease in the vapor pressure of the coolant. As a consequence, there is an increased flow of coolant from the buffer volume, compensating for the aforementioned losses. Porous inserts prevent peak-flow heat carrier emissions into the buffer element 6 and ensure device operability even when valve 10 is open, for example, when refueling buffer element 6. The presence of collectors 2 and 4 simplifies the solution of removing it from the elements 11 and 12 transformer housing. This ensures high maintainability of the device. The condenser 3 is made in the form of a hollow rib, hermetically connected to the tubular evaporator 1, increases the dynamic efficiency of the system, since heat removal in it occurs directly from the condensers - radiators 3 In the proposed device it is possible to use once / perpetual combinations of materials, such as sheet rib-radiators 3 and insulating tubular evaporators 1 (PTFE tube). The dimensions of the transformers are reduced, since the tubular evaporators 1 are at the same time electrically insulating elements. The proposed device is more technological, especially in terms of filling the entire system with coolant. The invention includes a transformer, preferably an explosion-proof, containing an active part located inside the case, heat pipes with an evaporator that contacts the active part and a condenser that contacts the cooling medium, which is found to increase the thermodynamic efficiency of the device and its reliability. the transformer is equipped with a buffer element with a heat-transfer fluid, the evaporators and the heat pipe capacitors are combined, respectively, by the collectors, which, through the inserts dineny to the buffer member and each heat pipe is stepped, take condensers of the heat pipes 75 is hermetically mounted on the transformer housing outer side. 2. The transformer according to claim 1, characterized in that the inserts are made porous. 3. The transformer according to claim 1, characterized in that the inserts are in the form of overpressure valves. Sources of information taken into account in the examination 1. US patent number, class. 336-58, 1978. 2. USSR author's certificate number 71i521, cl. H 01 F 27/18, 1E75.