Pump

A flying object raising system, comprising:

• a flying object, of which a structure is an inflatable structure, and that is moored by a main rope from a ground surface and raised overhead;
• a pump for pumping air into a bag-shaped structure body of the inflatable structure;
• and
• an adjusting unit for adjusting a height of the flying object, in which the pump includes
• a storage chamber that has a bag shape and that is made of an expandable and contractible flexible material for storing fluid,
• an expansion and contraction unit for expanding and contracting the storage chamber,
• an intake check valve that communicates with an interior of the storage chamber to only allow flow of fluid from outside of the storage chamber to inside of the storage chamber, and
• a discharge check valve that communicates with the interior of the storage chamber to only allow flow of fluid from the inside of the storage chamber to the outside of the storage chamber,
• the pump is configured such that
• when the storage chamber is expanded by the expansion and contraction unit, fluid flows into the storage chamber through the intake check valve, and
• when the storage chamber is contracted by the expansion and contraction unit, fluid flows out from inside the storage chamber through the discharge check valve,
• the expansion and contraction unit is linked to the main rope, and also is configured to apply deformation force to the storage chamber that varies with change in position of the flying object,
• the pump is configured such that
• when the deformation force from the expansion and contraction unit is applied, the storage chamber is deformed and volume of the storage chamber decreases, and
• when the deformation force from the expansion and contraction unit is eased, the storage chamber is relaxed and the volume of the storage chamber increases,
• the pump is configured such that expanding and contracting of the storage chamber feeds fluid into the bag-shaped structure body,
• the adjusting unit for adjusting the height of the flying object includes a detecting unit for detecting internal pressure of the bag-shaped structure body, and
• the flying object raising system is configured such that, when the internal pressure of the bag-shaped structure body falls below a predetermined value, the flying object is moved up or down, and is configured such that fluid is accordingly fed into the bag-shaped structure body by the pump.