PROBLEM TO BE SOLVED: To provide a "carbonated spring generator using a two-shaft positive displacement rotary pump" with a simple structure, by which a carbonated spring can stably and easily be obtained.SOLUTION: In the carbonated spring generator including a water tank for storing the carbonated spring, a pump unit for sending hot water through a circulating path to the water tank, and a carbon dioxide gas cylinder, the pump unit P comprises a roots pump 3 in which a pair of root rotors 26 stored in a pump casing 4 with a suction port and a discharge port are rotary-driven by a driving motor, and a carbon dioxide introducing tube 51 which leads carbon dioxide supplied from the carbon dioxide gas cylinder 61 to the suction port side. The hot water is sucked in from the water tank 70 by operation of the roots pump 3 while bubbles of the carbon dioxide taken in from the carbon dioxide introducing tube 51 is made fine by compression action of the pump 3, and the hot water containing the fine bubbles of the carbon dioxide is discharged into the water tank 70.COPYRIGHT: (C)2012,JPO&INPIT【課題】炭酸泉を安定して容易に得られる簡素な構造の「2軸容積式回転ポンプを用いた炭酸泉生成装置」を提供すること。【解決手段】 炭酸泉を貯留する水槽と、その水槽へ循環経路を介して湯を送り込むポンプユニットと、炭酸ガスボンベを備えた炭酸泉生成装置において、ポンプユニットPは、吸込口と吐出口を設けたポンプケーシング4内に収められた一対のルーツロータ26を駆動モータにより回転駆動されるルーツポンプ3と、炭酸ガスボンベ61から供給される炭酸ガスを該吸込口側に導く炭酸ガス導入管51からなり、ルーツポンプ3の運転により水槽70から湯を吸い込むと共に炭酸ガス導入管51から取り込まれる炭酸ガスの気泡を当該ポンプ3の圧縮作用によって微細化し、その微細化された炭酸ガスの気泡が含まれた湯を水槽70内へ放出する。【選択図】図1
