Energy conversion apparatus

An energy conversion apparatus comprising:

• an energy conversion module including:
• a piston;
• a piston rod provided on one side of the center of the piston;
• a cylinder divided into a first pressure space and a second pressure space to be relatively varied with the piston interposed therebetween;
• a first external air opening/closing part that selectively opens and closes external air to the first pressure space, wherein the external air being subject to a first pressure;
• and
• a second external air opening/closing part that selectively opens and closes the external air to the second pressure space;
• a first bellows containing a fluid therein and provided in the first pressure space to be compressed and expanded;
• a second bellows containing a fluid therein and provided in the second pressure space to be compressed and expanded;
• a fluid movement pipe which is positioned outside the cylinder and connects the first bellows and the second bellows to each other to form a closed space, and through which the fluid accommodated therein moves by pressure;
• a first bellows pressing part for pressing one side of the first bellows;
• a second bellows pressing part for pressing one side of the second bellows;
• a first motor transmitting a driving force to the first bellows pressing part;
• and
• a second motor transmitting a driving force to the second bellows pressing part,
• wherein the first external air opening/closing part is configured to connect the first pressure space selectively to the external air or to a vacuum state, the vacuum state being subject to a second pressure that is lower than the first pressure of the external air,
• wherein the second external air opening/closing part is configured to connect the second pressure space selectively to the external air or to the vacuum state, and
• wherein the first bellows and the second bellows are mounted inside both ends of the cylinder, respectively, such that when the first pressure space is at the vacuum state, the first bellows pressing part compresses the first bellows to transport the fluid inside the first bellows to the second bellows, and when the second pressure space is at the vacuum state, the second bellows pressing part compresses the second bellows to transport the fluid inside the second bellows to the first bellows.