pump

Abstract

The present invention provides a pump 1 suitable for injecting air into an inflatable bag-shaped structure 6, which is relatively flexible, less likely to damage the outer shell of the bag-shaped structure even when rubbing against it, and has a novel structure that performs air pumping operation without direct power supply. [Solution] The pump 1, configured to deliver fluid in one direction, includes a bag-shaped storage chamber 2 made of an expandable and flexible material for storing fluid, an expansion and contraction means 3 for expanding and contracting the storage chamber, an intake check valve 7 that communicates with the inside of the storage chamber and allows fluid to flow only from the outside to the inside of the storage chamber, and a discharge check valve 8 that communicates with the inside of the storage chamber and allows fluid to flow only from the inside to the outside of the storage chamber. When the storage chamber expands due to the expansion and contraction means, fluid flows into the storage chamber through the intake check valve, and when the storage chamber contracts due to the expansion and contraction means, fluid flows out of the storage chamber through the discharge check valve.

Description

Technical Field

[0001] The present invention relates to a pump for pumping a fluid in one direction. More specifically, the present invention relates to a pump configured to send out a fluid in one direction by expanding and contracting (expanding and contracting) a bag-shaped structure.

Background Art

[0002] In various mechanical devices, a mechanism that expands and contracts a bag-shaped structure connected to a movable part to displace the movable part is used. For example, in Patent Document 1, as a brake mechanism for a wheel of personal mobility, instead of a mechanical hydraulic brake, an artificial muscle, which is a bag-shaped structure containing a dielectric fluid, is electrically deformed to expand the artificial muscle to apply a braking force to the wheel. In addition, in Patent Document 2, as a deformation mechanism of a frame member of a flying object having a wing part that generates lift from wind pressure and is composed of an elastically deformable frame member and a membrane member stretched over the frame member, a configuration using a McKibben type artificial muscle that expands and contracts a bag-shaped structure by introducing and discharging compressed air from a compressor into the bag-shaped structure has been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Incidentally, inflatable structures, that is, bag-like structures that are inflated by injecting air and maintain their shape by internal pressure, are lightweight and are therefore used in a variety of applications, such as wings and other structures for aircraft like inflatable kites and inflatable boats, building structures like dome roofs and disaster shelters, road structures like pylons and road control members, and toys, play equipment, and objects that are inflated and unfolded like balls. In such inflatable structures, during long-term operation, a decrease in internal pressure may occur due to air leakage from the outer skin of the structure, and if this happens, the shape cannot be maintained, so a mechanism to periodically supply compressed air into the bag-like structure is sometimes provided (if the bag-like structure is not equipped with a compressed air supply mechanism, it is necessary to periodically interrupt the operation of the inflatable structure and perform work to pressurize the inside of the bag-like structure). In compressed air delivery mechanisms for such inflatable structures, generally, as in Patent Document 2, for example, a pump device such as a compressor is placed near the bag-shaped structure. However, when the position and shape of the structure change in industrial use or in sports and recreation settings, or when the air is removed from the bag-shaped structure and it is folded for storage, the outer shell of the bag-shaped structure and the pump device may rub against each other. Therefore, to avoid damaging the outer shell of the bag-shaped structure, it is advantageous for the pump device to have a flexible configuration rather than a rigid one. Furthermore, in the case of structures that are flown into the air, such as inflatable kites, weight restrictions may make it difficult to mount a power supply or an electric pump device. In recreation and disaster prevention settings, it may also be difficult to secure a power supply for the pump.

[0005] In light of the above circumstances, the main object of the present invention is to provide a pump suitable for injecting air into an inflatable bag-shaped structure, which is relatively flexible, has a structure that does not easily damage the outer shell of the bag-shaped structure even when it rubs against it, and has a novel structure that can perform air pumping operation without direct power supply. [Means for solving the problem]

[0006] According to the present invention, the above problem is solved in one embodiment by providing a pump configured to deliver fluid in one direction, A bag-shaped storage chamber formed of an expandable and flexible material for storing fluid, The aforementioned storage chamber is provided with an expansion / contraction means for expanding and contracting, A suction check valve that communicates with the inside of the storage chamber and allows fluid flow only from the outside to the inside of the storage chamber, A discharge check valve that communicates with the inside of the storage chamber and allows fluid to flow only from the inside to the outside of the storage chamber. This is achieved by a pump configured such that when the storage chamber expands due to the expansion / contraction means, fluid flows into the storage chamber through the intake check valve, and when the storage chamber contracts due to the expansion / contraction means, fluid flows out of the storage chamber through the discharge check valve.

[0007] In the above configuration, the fluid may be any fluid, such as air or water. The "bag-shaped storage chamber" is formed of an expandable and flexible material capable of storing fluid inside, and specifically, it may be formed of any elastic material, for example, an expandable and expandable rubber material having sufficient strength to withstand the internal pressure when fluid is stored in the storage chamber. The "expansion and contraction means" may be a means for expanding or contracting the bag-shaped storage chamber by any mechanism. In one embodiment, for example, a mechanism may be employed in which, when a mechanical action is applied to the storage chamber by the expansion and contraction means, the storage chamber contracts or expands, and when the mechanical action on the storage chamber is relaxed by the expansion and contraction means, the storage chamber expands or contracts due to its elasticity. As described above, the inside of the storage chamber is in communication with an intake check valve that allows fluid to flow only from outside to inside the storage chamber and a discharge check valve that allows fluid to flow only from inside to outside the storage chamber. The intake check valve and the discharge check valve may be incorporated into a tubular path through which fluid flows in and out of the storage chamber.

[0008] According to the configuration of the present invention described above, when the storage chamber is expanded by the expansion / contraction means, fluid flows into the storage chamber through the intake check valve, and when the storage chamber is contracted by the expansion / contraction means, fluid flows out of the storage chamber through the discharge check valve, thereby enabling the fluid to be delivered in one direction from upstream of the intake check valve to downstream of the discharge check valve. Since this configuration basically consists of a bag-shaped storage chamber formed from a flexible material, an intake check valve and a discharge check valve communicating with the storage chamber, and an expansion / contraction means for expanding and contracting the storage chamber in any manner, unlike conventional machinery and equipment having a rigid housing like a compressor, it is possible to have a configuration that is relatively flexible and less likely to damage the outer skin of the inflatable bag-shaped structure even if it rubs against other components, and it is also possible to have a configuration that performs air pumping operation without direct power supply, so it is not necessary to place the power supply device near the pump, which is an advantage.

[0009] As previously mentioned, the pump configuration of the present invention may be used to supply fluid to an inflatable bag-shaped structure. In this case, the fluid outlet (downstream side) of the discharge check valve may be connected to the inside of the inflatable bag-shaped structure, and the fluid may be supplied to the bag-shaped structure by the expansion and contraction of the storage chamber. The intake check valve is connected to the fluid source, and if the fluid is air, it may be open to the atmosphere.

[0010] Regarding the expansion and contraction of the storage chamber by the expansion and contraction means of the above configuration, specifically, the expansion and contraction means may be configured to apply a deformation force to the storage chamber, and when a deformation force is applied from the expansion and contraction means, the storage chamber deforms and the volume inside the storage chamber contracts, and when the deformation force from the expansion and contraction means is relieved, the storage chamber relaxes and the volume inside the storage chamber expands. For example, in one embodiment, the storage chamber is a bag-like structure with a cylindrical, ellipsoidal, or spindle-shaped outer shape made of an elastic material, the expansion and contraction means is a mesh-like tube surrounding the storage chamber, and the bag-like structure is configured to expand the tubular expansion and contraction means radially by its elastic force. When the ends of the tubular expansion / contraction mechanism are pulled away from each other, the tube expands longitudinally while its diameter contracts. Simultaneously, the storage chamber expands longitudinally while its diameter contracts, reducing the volume inside the storage chamber. When the tension on both ends of the tubular expansion / contraction mechanism is released, as described above, the elastic force of the storage chamber causes the tube shape of the expansion / contraction mechanism and the storage chamber to contract longitudinally while their inner diameters expand, increasing the volume inside the storage chamber.

[0011] The configuration in which the expansion / contraction means applies a deformation force to the storage chamber, or more specifically, the configuration in which both ends of the tubular expansion / contraction means are pulled, can be achieved in any manner. In one embodiment, the expansion / contraction means is connected to an inflatable structure, and as the position of the inflatable structure changes, the deformation force applied from the expansion / contraction means to the storage chamber or the pulling force at both ends of the tubular expansion / contraction means changes, causing fluid to be sent into the bag-like structure of the inflatable structure.

[0012] In this configuration, an optional mechanism may be provided to prevent overpressure within the bag-shaped structure when the internal pressure of the inflatable structure reaches a predetermined pressure, thereby preventing the inflation / deflation mechanism from applying deformation force to the storage chamber. Such a mechanism may be used in which the ends of the tubular inflation / deflation mechanism are locked when the internal pressure of the bag-shaped structure reaches a predetermined pressure. Alternatively, a mechanism may be provided in which the position of the inflatable structure is actively or automatically displaced periodically when the internal pressure of the bag-shaped structure falls below a lower limit pressure, thereby causing the inflation / deflation mechanism to periodically apply deformation force to the storage chamber.

[0013] The pump of the present invention described above may be advantageously used to pump air into the inflatable structure of an aircraft that is moored by a main rope from the ground and lifted into the air. In this case, the inflation / deflation means of the pump of the present invention may be connected to the main rope that moores the aircraft, and by displacing the height of the aircraft, the deformation force from the inflation / deflation means to the storage chamber through the main rope will fluctuate, thereby pumping air into the bag-shaped structure of the inflatable structure. In such an aircraft lifting system, it is convenient if the internal pressure of the bag-shaped structure of the inflatable structure is monitored, and when the internal pressure falls below a predetermined pressure set as appropriate, the height of the aircraft is displaced, thereby executing the pumping operation and maintaining the internal pressure of the bag-shaped structure of the inflatable structure above the predetermined pressure.

[0014] Thus, according to another aspect of the present invention, an aircraft lifting system comprising an inflatable aircraft that is tethered to the air by a main rope from the ground and lifted into the air, a pump for pressurizing air into the bag-shaped structure of the inflatable aircraft, and means for adjusting the height of the aircraft, The pump includes a bag-shaped storage chamber formed of an expandable and flexible material for storing fluid, an expansion and contraction means for expanding and contracting the storage chamber, an intake check valve communicating with the inside of the storage chamber and allowing fluid to flow only from outside to inside the storage chamber, and a discharge check valve communicating with the inside of the storage chamber and allowing fluid to flow only from inside to outside the storage chamber. When the storage chamber expands due to the expansion and contraction means, fluid flows into the storage chamber through the intake check valve, and when the storage chamber contracts due to the expansion and contraction means, fluid flows through the discharge check valve. The fluid is configured to flow out of the storage chamber, the expansion / contraction means is connected to the main rope and is configured to apply a deformation force to the storage chamber that changes with the position of the aircraft, when the deformation force is applied from the expansion / contraction means the storage chamber deforms and the volume inside the storage chamber contracts, when the deformation force from the expansion / contraction means is released the storage chamber relaxes and the volume inside the storage chamber expands, and the expansion and contraction of the storage chamber is configured to send fluid into the bag-like structure. The means for adjusting the height of the aircraft includes means for detecting the internal pressure of the bag-shaped structure, and is configured to raise or lower the aircraft when the internal pressure of the bag-shaped structure falls below a predetermined value, thereby providing an aircraft lifting system configured to supply fluid to the bag-shaped structure by the pump. [Effects of the Invention]

[0015] Thus, according to the present invention, a pump suitable for injecting air into a bag-shaped structure of an inflatable structure is provided. The main component of the pump of the present invention is a bag-shaped storage chamber formed of an expandable and flexible material, which is relatively flexible and can be configured such that even if it rubs against the outer skin of the bag-shaped structure, it is difficult to damage the outer skin. Further, the deformation force by the expansion means for expanding and contracting the storage chamber can be applied by any method, and the expansion means can be connected to the main cable for mooring the inflatable structure, and the deformation force can be applied by changing the position of the inflatable structure, etc., so a system for performing the air pumping operation without depending on direct power supply can also be configured. The pump of the present invention can be used for increasing or maintaining the internal pressure of the entire structure that is inflated with air and continuously operated for a certain period of time, for example, architectural structures such as the roof of a dome or an evacuation shelter during a disaster, road structures such as pylons and road regulation members, toys, play equipment, and objects that are inflated with air such as balls, the structure of a moving body such as an inflatable kite or an inflatable boat, and the bag-shaped structure of the wing.

[0016] Other objects and advantages of the present invention will become apparent from the following description of the preferred embodiments of the present invention.

Brief Description of the Drawings

[0017] [Figure 1] FIG. 1 is a schematic diagram of the pump according to the present embodiment. [Figure 2] FIGS. 2(A) and (B) are schematic diagrams for explaining the operation of the pump according to the present embodiment. [Figure 3] FIG. 3(A) is a schematic diagram of a system for lifting a flying object to which the pump according to the present embodiment is applied, and FIG. 3(B) is a schematic diagram of the time change of the tension Ft acting on the outer tube of the pump.

Explanation of Reference Numerals

[0018] 1... Pump, 2... Bladder (storage chamber), 3... Outer tube (expansion and contraction means), 3a... Outer tube end, 4... Inlet / outlet, 5... Fluid tube, 6... Inflatable bag-shaped structure, 7... Suction check valve, 8... Discharge check valve, 10... Kite (flying object), 11... Inflatable structure, 12... Internal pressure sensor device, 13... Main cable, 20... Kite mooring device

Best Mode for Carrying Out the Invention

[0019] The present invention will be described in detail with respect to several preferred embodiments while referring to the accompanying drawings below. In the drawings, the same reference numerals indicate the same parts.

[0020] Pump configuration As shown in FIG. 1, the pump 1 according to the present embodiment is a bag-shaped structure formed of a flexible elastic material having a cylindrical, ellipsoidal or spindle shape, and includes a bladder (storage chamber) 2 capable of storing fluid therein, an outer tube 3 that may be a tube configured to surround the bladder 2, a fluid tube 5 connected to an inlet / outlet 4 communicating with the inside of the bladder 2 through which any fluid such as air or water flows, a suction check valve 7 that allows only the flow of fluid from one end of the fluid tube 5 to the inlet / outlet 4, and a discharge check valve 8 that allows only the flow of fluid from the inlet / outlet 4 to the other end of the fluid tube 5.

[0021] In the above configuration, the bladder 2 may be made of any elastic material, such as a stretchable rubber material, that has sufficient strength to withstand the internal pressure when fluid is stored in the storage chamber. When the bladder 2 is not subjected to external forces such as tension or compression from its surroundings, it is formed to form a cylindrical, ellipsoidal, or spindle-shaped space inside. The outer tube 3 may be a tubular shape that stretches and expands around the bladder 2, and as described later, it is configured to contract the bladder 2 when the outer tube 3 is stretched in the longitudinal direction. Typically, the outer tube 3 may be a mesh tube, for example, as shown in the figure, in which case the direction of the mesh is inclined with respect to the longitudinal direction of the outer tube 3, and as a result, when the outer tube 3 is pulled in both longitudinal directions, its diameter will contract. The ends 3a of the outer tube 3 are connected to any type of mechanism, and when an external force Ft is applied to stretch the outer tube 3 longitudinally, a force Fp acts on the portion between the ends 3a of the outer tube 3 in a direction that reduces its diameter, causing the bladder 2 inside it to shrink along with the outer tube 3. The outer tube 3 may be made of any material that allows it to expand and contract, such as plastic materials (polyester, polyethylene, nylon, etc.), carbon fiber, or steel fiber. The fluid tube 5, which is connected to the inlet and outlet 4 that communicate with the inside of the bladder 2, may be a tubular member made of a material commonly used in this art, and as shown in the figure, an intake check valve 7 and a discharge check valve 8 are arranged on either side of the connection between the fluid tube 5 and the inlet and outlet 4. The intake check valve 7 and the discharge check valve 8 may be check valves that allow fluid to flow in only one direction, in a manner commonly used in this art. The upstream side 5b of the intake check valve 7 in the fluid pipe 5 is connected to the fluid supply source S to be pumped by the pump 1, and may be open to the atmosphere if the fluid is air. The downstream side 5a of the discharge check valve 8 in the fluid pipe 5 is connected to the destination of the fluid, and if the pump is used to increase or maintain the internal pressure of the inflatable structure, it is connected to the inside of the bag-shaped structure 6 of the inflatable structure, as shown in the figure.

[0022] Pump operation In the operation of the pump 1 according to this embodiment, in short, the fluid is pumped in one direction by the reduction and expansion of the diameter of the outer tube 3 due to the increase or decrease of the external force Ft acting on both ends 3a of the outer tube 3 as shown in Figure 1. More specifically, first, when no external force Ft acts on both ends 3a of the outer tube 3 or when it is low, as shown in Figure 2(A), the inner diameter of the bladder 2 expands due to the elastic force Fe of its outer wall, and the volume inside the bladder 2 becomes large. Here, when the diameter of the bladder 2 expands, fluid flows into the bladder 2, and since the flow of fluid into the bladder 2 is permitted only at the suction check valve 7, the fluid flows into the bladder 2 from the end I connected to the fluid supply source. Next, when the external force Ft increases at both ends 3a of the outer tube 3, the force Fp (Figure 1) that causes the outer tube 3 to reduce its diameter overcomes the elastic force Fe that causes the bladder 2 to expand its diameter. As a result, as shown in Figure 2(B), the diameter of the bladder 2 decreases, and the volume inside the bladder 2 contracts. At this time, the fluid stored inside the bladder 2 can only flow through the discharge check valve 8, and is therefore pumped to the fluid supply destination, for example, the end O connected to the inside of the inflatable bag-shaped structure 6. After that, when the external force Ft decreases at both ends 3a of the outer tube 3, the elastic force Fe of the outer wall of the bladder 2 again causes its inner diameter to expand, and the volume inside the bladder 2 expands, as shown in Figure 2(A). At this time, as described above, the fluid can only flow in through the intake check valve 7, and flows into the bladder 2 from the end I connected to the fluid supply source. Furthermore, by repeatedly increasing and decreasing the external force Ft applied to both ends 3a of the outer tube 3 as described above, the outer tube 3 repeatedly shrinks and expands in diameter. This causes the bladder 2 to repeatedly contract and expand, thereby pressurizing the fluid from the supply source through the bladder 2 to the supply destination.

[0023] In the case of the pump 1 of this embodiment described above, the Prada 2 and the surrounding sheath tube 3 are relatively flexible and do not have a rigid housing like conventional compressors, which is advantageous because the outer skin of the bag-like structure 6 is less likely to be damaged when it rubs against the Prada 2 when folding the inflatable structure. Furthermore, the pump's pumping operation only requires that a tensile force be applied to both ends 3a of the sheath tube 3, which can be achieved, for example, by attaching both ends 3a of the sheath tube 3 to any mechanism so that they are repeatedly separated and brought close together.Therefore, since the pump itself does not require a power supply, it is not necessary to place a power supply device near the pump, which is advantageous when it is desirable to lighten the equipment related to the pump as much as possible, such as when the pump 1 of this embodiment is mounted on the aircraft or the main rope that tethers it to increase or maintain the internal pressure of the inflatable structure of the aircraft being lifted into the air in the aircraft lifting system described later.

[0024] Configuration and operation of the aircraft lifting system As mentioned earlier, the pump of this embodiment may be incorporated into the main rope 13 or the like that which moors the kite 10 to a mooring device 20 installed on the ground or elsewhere, in a kite lifting system (flying object lifting system) that lifts a kite 10 (flying object) moored to a mooring device 20 installed on the ground or elsewhere by a main rope 13, in order to increase or maintain the inflatable structure used in the structure of the kite. In the illustrated configuration, the outer tube 3 of the pump 1 is incorporated into the main rope 13, the downstream side 5a of the discharge check valve 8 of the fluid pipe 5 connected to the inlet and outlet 4 of the bladder 2 is in communication with the inside of the inflatable structure 11 of the kite 10, and the upstream side 5b of the intake check valve 7 of the fluid pipe 5 is open to the atmosphere. The inflatable structure 11 may be provided with a sensor device 12 that detects its internal pressure and is configured to transmit the detected internal pressure value to the mooring device 20. According to the above configuration, as the height of the kite 10 rises or falls, the tension of the main rope 13 fluctuates. This causes the tensile force Ft between the ends of the outer tube of the pump 1 to change, as shown in Figure 3(B). As a result, the deformation force of the bladder by the outer tube changes, causing the bladder to expand (in) and contract (out), and thus air is sent into the inflatable structure 11.

[0025] In the above kite lifting system, more preferably, various operations may be performed according to the detection value of a sensor device 12 that detects the internal pressure of the inflatable structure 11, as described above. Specifically, first, when the detection value of the internal pressure sensor device 12 reaches an appropriately set upper limit of internal pressure, deformation of the outer tube of the pump 1 may be suppressed. The upper limit of internal pressure may be set to a value that is considered sufficient for the internal pressure of the inflatable structure 11 to maintain the shape of the inflatable structure 11. Suppression of deformation of the outer tube can be achieved by any type of mechanism that locks the distance between both ends of the outer tube (Figure 1) in response to the detection value of the internal pressure sensor device 12 reaching the upper limit. Furthermore, when the detection value of the internal pressure sensor device 12 falls below an appropriately set lower limit of internal pressure, the distance between both ends of the outer tube may be actively or self-excitedly changed, thereby enabling the pump 1 to supply air to the inflatable structure 11. The lower limit of the internal pressure may be set to a value such that, if the internal pressure of the inflatable structure 11 falls below that value, it becomes difficult to maintain the shape of the inflatable structure 11. Variations in the distance between the ends of the sheath tube can be achieved, for example, by varying the height of the kite 10 using any method (such as changing the structure of the kite or changing the tension of the main rope 13). The range of change in the volume of the expansion and contraction of the storage chamber of the pump 1 may be adjusted to match the range of change ΔFt of the tension Ft acting on the sheath tube from the main rope due to the raising and lowering of the height of the kite 10, as shown in Figure 3(B).

[0026] As described above, when the pump 1 of this embodiment is applied to the kite lifting system, the pump 1 is relatively flexible, as already mentioned, and does not have a rigid housing. This is advantageous because it makes it less likely for the outer skin of the inflatable structure 11 to be damaged when it rubs against the pump when folding the structure. Furthermore, since the pump 1 pumps air by expanding and contracting the outer tube, the outer tube itself does not require a power supply. Therefore, there is no need to place a power supply device near the outer tube, which is advantageous because it allows for a lighter pump.

[0027] While the above description is made in relation to embodiments of the present invention, many modifications and changes are readily possible for those skilled in the art, and it will be clear that the present invention is not limited to the embodiments illustrated above, but can be applied to various devices without departing from the concept of the present invention.

Claims

1. A pump configured to deliver fluid in one direction, A bag-shaped storage chamber formed of an expandable and flexible material for storing fluid, The aforementioned storage chamber is provided with an expansion / contraction means for expanding and contracting, A suction check valve that communicates with the inside of the storage chamber and allows fluid flow only from the outside to the inside of the storage chamber, A discharge check valve that communicates with the inside of the storage chamber and allows fluid to flow only from the inside to the outside of the storage chamber. A pump comprising the expansion and contraction means, wherein when the storage chamber expands, fluid flows into the storage chamber through the intake check valve, and when the storage chamber contracts due to the expansion and contraction means, fluid flows out of the storage chamber through the discharge check valve.

2. A pump according to claim 1, wherein the fluid outlet of the discharge check valve communicates with an inflatable bag-shaped structure, and the fluid is sent into the bag-shaped structure by the expansion and contraction of the storage chamber.

3. A pump according to claim 1 or 2, wherein the expansion / contraction means is configured to apply a deformable force to the storage chamber, and when the deformable force is applied from the expansion / contraction means, the storage chamber deforms and the volume inside the storage chamber contracts, and when the deformable force from the expansion / contraction means is released, the storage chamber relaxes and the volume inside the storage chamber expands.

4. A pump according to claim 3, relating to claim 2, wherein the expansion and contraction means is connected to the inflatable structure, and the deformation force applied from the expansion and contraction means to the storage chamber changes as the position of the inflatable structure changes, thereby sending fluid into the bag-like structure.

5. An aircraft lifting system comprising an inflatable aircraft that is tethered to the air by a main cable from the ground and lifted into the air, a pump for pressurizing air into the bag-like structure of the inflatable aircraft, and means for adjusting the height of the aircraft, The pump includes a bag-shaped storage chamber formed of an expandable and flexible material for storing fluid, an expansion and contraction means for expanding and contracting the storage chamber, an intake check valve communicating with the inside of the storage chamber and allowing fluid to flow only from outside to inside the storage chamber, and a discharge check valve communicating with the inside of the storage chamber and allowing fluid to flow only from inside to outside the storage chamber. When the storage chamber expands due to the expansion and contraction means, fluid flows into the storage chamber through the intake check valve, and when the storage chamber contracts due to the expansion and contraction means, fluid flows through the discharge check valve. The fluid is configured to flow out of the storage chamber, the expansion / contraction means is connected to the main rope and is configured to apply a deformation force to the storage chamber that changes with the position of the aircraft, when the deformation force is applied from the expansion / contraction means the storage chamber deforms and the volume inside the storage chamber contracts, when the deformation force from the expansion / contraction means is released the storage chamber relaxes and the volume inside the storage chamber expands, and the expansion and contraction of the storage chamber is configured to send fluid into the bag-like structure. An aircraft lifting system configured such that the means for adjusting the height of the aircraft includes means for detecting the internal pressure of the bag-shaped structure, and when the internal pressure of the bag-shaped structure falls below a predetermined value, the aircraft is raised or lowered, thereby causing fluid to be supplied to the bag-shaped structure by the pump.

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