Electric discharge pump

Abstract

The invention discloses an electric discharge pump which comprises a lamp holder, a lamp casing and an electric arc tube arranged in the lamp casing. The electric discharge pump is characterized in that a transitional casing is fixedly arranged between the electric arc tube and the lamp casing, the transitional casing is sleeved on the periphery of the electric arc tube in sealing mode, nitrogen and oxygen mixed gas is filled in an area between the transitional casing and the electric arc tube, and the area between the transitional casing and the lamp casing is vacuated. The electric discharge pump has the advantage that inner pressure and outer pressure of the electric arc tube achieve good balance, discharging substances in the electric arc tube can be effectively prevented from running away, vacuum can effectively prevent heat generated by the electric arc tube from being diffused outside the lamp casing, an electric arc tube system can maintain stable temperature gradient, heat loss is small, and therefore luminous efficiency is improved greatly, and service life of a bulb is further prolonged simultaneously. Experiments show that luminous efficiency of the electric discharge lamp can reach 120lm/W. Compared with an electric discharge lamp of a traditional structure, the luminous efficiency of the electric discharge lamp is approximately improved by 50%.

Description

technical field [0001] The invention relates to a discharge lamp. Background technique [0002] Discharge lamp refers to a kind of electric lamp that produces light or radiant energy close to visible light by passing current through special steam or gas. Existing discharge lamps are usually composed of an arc tube, a lamp housing, and a lamp cap. When the power supply energizes the arc tube through a ballast, the gas in the arc tube discharges under high pressure, and the luminescent substance filled in the arc tube ionizes and emits light. The sealing sleeve of the lamp housing is arranged outside the arc tube to prevent the bad influence of impurities on the arc tube. Usually, the area between the lamp housing and the arc tube is filled with a certain amount of nitrogen gas, which is used to balance the air pressure inside and outside the arc tube and prevent the arc tube from bubbling. However, the thermal conductivity of the arc tube is relatively large, and the heat ...

AI Technical Summary

Problems solved by technology

However, the thermal conductivity of the arc tube is large, the heat is transferred to the outer surface of the arc tube through the arc tube wall, and then transferred to the outside through the nitrogen space, the large loss of heat leads to the low luminous efficiency of the discharge lamp

At present, in order to prevent the loss of heat, some people evacuate the area between the lamp housing and the arc tube. Although it can prevent the loss of heat and improve the luminous efficiency, the pressure difference between the inside and outside of the arc tube will lead to the loss of the discharge substance sodium in the arc tube. Bulb life shortened

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