From the perspective of patent,analyzed the patents related to the valve technique for compressors used for refrigeration.The number of the related patents dis-tributed by countries was summarized.The trends of number of patents distributed by cal-endar year of grant in China and foreign countries were shown respectively.The main ap-plicants were also list in this paper.The paper summarized the main categories of the valve technique for compressors and their patent distribution.Different valve structures were re-viewed.The purpose of this paper is to provide useful information for further development of the valve technique for refrigeration compressors.
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万方数据
