Fluid transfer device

Abstract

To provide a fluid transfer device that eliminates the necessity of a power supply, can generate a siphon phenomenon and has a compact configuration.SOLUTION: A fluid transfer device 1 includes: a transfer pipe 10 extending from a storage part 3 storing fluid toward a transfer destination 50; and pressure generating means 20 connected to the transfer pipe 10 and generating pressure for sucking up fluid in the storage part 3 to a water level starting a siphon in the transfer pipe 10. The pressure generating means 20 includes a negative pressure generating part 41 disposed between an upstream side transfer pipe 11 serving as a storage part 3 side and a downstream side transfer pipe 12 serving as a transfer destination 50 side. The negative pressure generating part 41 includes: an inflow port (branch pipe part 44a) connected to the upstream side transfer pipe 11; and an outflow port (lower end part of a straight pipe part 44b) connected to the downstream side transfer pipe 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fluid transfer device. [Background technology]

[0002] In recent years, flood damage caused by large amounts of rainfall concentrated at one time, such as torrential rains and typhoons, has become a problem. For example, in the case of buildings, flooding occurs due to river flooding, but after flooding occurs under the floor, muddy water remains in the foundation even after the water subsides. In such cases, it would be good if the muddy water could be drained quickly, but in the case of a large-scale disaster, it has to be left until the evacuation order is lifted, and even if people are able to return home, drainage pumps cannot be used if there is a power outage or if it is difficult to obtain a pump itself. Therefore, manual drainage is necessary, but in the case of elderly residents, the situation in which they cannot even drain the water is a problem. If muddy water is left for a long time, mold will grow and the pillars will corrode, causing damage to the building. Therefore, the development of a device that can quickly drain the muddy water that has accumulated in the foundation is an urgent issue.

[0003] Incidentally, a device that uses a siphon is known as a device capable of draining water accumulated in a specified space (see, for example, Patent Document 1). When using a siphon to drain water accumulated in a water tank, for example, one end of an inverted U-shaped pipe is installed on the water tank side as a water intake hole, and the other end is installed on the drain tank side as a drain hole. In this state, by removing the air in the pipe (filling the pipe with water), the principle of the siphon works, and the water on the water tank side is drained to the drain tank side. Patent Document 1 discloses a device that has a configuration in which an air suction pipe and the top of the siphon are connected via a connecting pipe at the flow path outlet of the siphon pipe, thereby removing the residual air in the top of the siphon pipe without using a pump or the like, and shortening the time it takes to form a siphon.

[0004] Another configuration is a drainage device that has a drain hole connected to a drain pipe on the bottom of the foundation. In this case, a cover is provided on the drain hole to prevent water from backflowing from the drain pipe, and the cover is removed when draining. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-231397 Summary of the Invention [Problem to be solved by the invention]

[0006] The siphon device in Patent Document 1 has a large-scale device configuration, and depending on the structure of the building, installation can be difficult, which is a current issue. On the other hand, in a drainage device in which a drain pipe is installed on the bottom surface of the foundation, it is very difficult to remove the cover of the drain hole in the event of flooding, making it difficult to drain water.

[0007] Furthermore, there is a demand for drainage systems using siphon devices to be used not only for draining water from the foundations of buildings, but also for transporting fluids such as water stored in water tanks and swimming pools.

[0008] Therefore, the present invention has been devised to solve the above problems, and an object of the present invention is to provide a fluid transfer device that is capable of generating a siphon phenomenon without requiring a power source and has a compact configuration. [Means for solving the problem]

[0009] The present invention for solving the above-mentioned problems provides a fluid transfer device having a transfer pipe extending from a storage section that stores a fluid toward a transfer destination, and a pressure generating means that is connected to the transfer pipe and generates a pressure for sucking up the fluid in the storage section to a water level that activates a siphon in the transfer pipe, the pressure generating means including a negative pressure generating section disposed between the transfer pipe on the upstream side, which is the storage section side, and the transfer pipe on the downstream side, which is the transfer destination side, and a resistance section that obstructs the flow of water is formed at the lower end of the transfer pipe on the downstream side. The pressure generating means includes a float-type first valve installed in a liquid storage tank that stores liquid to be supplied to a jet pipe whose downstream end opens into the inside of the negative pressure generating unit, and a second valve that stops the jet from the jet pipe. It is characterized by:

[0010] According to the fluid transfer device of the present invention, when the pressure generating means sucks the fluid in the storage section up to a predetermined water level in the transfer pipe, a siphon is activated in the transfer pipe, and the water in the storage section is automatically transferred. Therefore, such a drainage device does not require a power source and has a compact configuration. Furthermore, since the fluid transfer device is easy to install, it can transfer fluids such as water stored in a water tank or pool.

[0011] In the fluid transfer device of the present invention, The resistor portion is preferably L-shaped. In the fluid transfer device of the present invention, the pressure generating means The above It is preferable that the negative pressure generating section is provided with a jet section that jets the fluid. With this configuration, the fluid in the reservoir section can be easily sucked up in the transfer pipe, so that the siphon can be efficiently started. Effect of the Invention

[0017] According to the fluid transfer device of the present invention, the siphon phenomenon can be generated without the need for a power source, and the configuration can be made compact. [Brief description of the drawings]

[0018] [Figure 1] 1 is a cross-sectional view showing a case where the fluid transfer device according to the first embodiment of the present invention is used in a house. [Diagram 2] 1A and 1B are diagrams showing a fluid transfer device according to an embodiment of the present invention, in which (a) is a side view and (b) is a plan view. [Diagram 3] 5(a) to 5(d) are cross-sectional views showing a part of an operation for starting a siphon by the fluid transfer device according to the embodiment of the present invention. [Figure 4] 5(a) to 5(c) are cross-sectional views showing a state in which a siphon is activated by the fluid transfer device according to the embodiment of the present invention. [Diagram 5] FIG. 2 is a diagram showing an outline of negative pressure measurement in the first embodiment. [Figure 6] FIG. 1 is a diagram showing an outline of measurement of the amount of water transport in Example 1. [Figure 7] FIG. 2 is a cross-sectional view showing a fluid transfer device according to a first modified example of the first embodiment of the present invention. [Figure 8] FIG. 11 is a cross-sectional view showing a fluid transfer device according to Modification 2 of the first embodiment of the present invention. [Figure 9] 5(a) and 5(b) are cross-sectional views showing a fluid transfer device according to a second embodiment of the present invention. [Figure 10] FIG. 4 is a cross-sectional view showing a fluid transfer device according to a third embodiment of the present invention. [Figure 11] 13(a) and 13(b) are cross-sectional views showing a fluid transfer device according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A drainage device and a siphon device according to a first embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, as shown in FIG. 1, a fluid transfer device 1 that drains water W accumulated inside a foundation 2 of a house will be described as an example. The fluid transfer device 1 according to this embodiment includes a transfer pipe 10 and a pressure generating means 20. In this embodiment, the pressure generating means 20 is installed outdoors at a position higher than the height of the foundation 2.

[0020] The transfer pipe 10 is a pipe extending from the storage section 3 (the internal space of the foundation 2) that stores a fluid (water W in this embodiment) toward the transfer destination. The transfer pipe 10 includes an upstream transfer pipe 11 located upstream of the pressure generating means 20 and a downstream transfer pipe 12 located downstream. The upstream transfer pipe 11 includes a lift pipe 13 inserted inside the storage section 3 and an external horizontal pipe 14 that is continuous with the lift pipe 13. In this embodiment, the lift pipe 13 is inserted into the storage section 3 from an underfloor inspection hatch 4 provided on a floor surface such as flooring inside the house. The horizontal pipe 14 is laid on the floor surface such as flooring, and is connected to the pressure generating means 20 installed outdoors, passing through a kitchen door 5 or the like.

[0021] The downstream transfer pipe 12 is disposed outdoors, and constitutes a flow lower portion that is continuous with a negative pressure generating section 41 (described later) of the pressure generating means 20 and extends downward for a predetermined length. An L-shaped joint 15 is provided at the lower end of the downstream transfer pipe 12, and the flow path is bent. By providing the L-shaped joint 15, the flow of water flowing down the downstream transfer pipe 12 is obstructed. In other words, the L-shaped joint 15 becomes a resistance portion that obstructs the flow of water in the downstream transfer pipe 12.

[0022] The pressure generating means 20 is connected to the transfer pipe 10 and generates pressure to suck up the fluid in the storage section 3 to a water level that activates a siphon in the transfer pipe 10. As shown in FIG. 2, the pressure generating means 20 includes a water injection section 21, a supply section 31, and a negative pressure generating section 41.

[0023] The water injection section 21 is a section for storing water to be supplied to the negative pressure generating section 41, and has a cylindrical water injection tank 22 (liquid storage tank) with an open top. The water injection tank 22 has a shape that allows water to be easily poured from above and allows a first valve 23, which will be described later, to be easily installed. The first valve 23 is a plug member that stops the jet of water to the negative pressure generating section 41. A reduced diameter section 24 is formed at the lower end of the water injection section 21. The reduced diameter section 24 has a diameter that decreases as it extends downward. An L-shaped joint 25 is connected to the lower end of the reduced diameter section 24. The downstream end of the L-shaped joint 25 is connected to the supply section 31. In this embodiment, the L-shaped joint 25 is directly connected to the reduced diameter section 24, but may be connected via a separate pipe or the like.

[0024] The first valve 23 has a hollow spherical shape made of, for example, a rubber material or a soft polyvinyl chloride material so that it can float on water. The first valve 23 is smaller than the inner diameter of the water injection tank 22 and can be inserted into the water injection tank 22. The first valve 23 is larger than the inner diameter of the lower part of the reduced diameter part 24 and is engaged by the reduced diameter part 24. The first valve 23 configured in this way floats on the water in the water injection tank 22, and when the water level drops, it abuts against the inclined part of the reduced diameter part 24 to block the water flow. The first valve 23 is not limited to being hollow, and may be solid as long as it is made of a material with a low specific gravity that floats on water, such as polystyrene foam, polyethylene, or polypropylene. The shape of the first valve 23 is also not limited to being spherical, and may be any shape that allows the reduced diameter part 24 and the first valve 23 to be in close contact with each other and function as a valve.

[0025] The supply unit 31 has a role of supplying water to the negative pressure generating unit 41, and constitutes a jet unit that jets the water injected into the water injection unit 21 to the negative pressure generating unit 41 in combination with the water injection unit 21. The supply unit 31 includes an inner tube 32, an outer tube 33, a cap 34, and an L-shaped joint 35. The L-shaped joint 25 of the water injection unit 21 and the L-shaped joint 35 of the supply unit 31 are connected in a U-shape, and the inner tube 32 and the outer tube 33 are connected so as to rise above the L-shaped joint 35. In this embodiment, the L-shaped joint 25 and the L-shaped joint 35 are directly connected, but they may be connected via a separate pipe or the like.

[0026] The inner cylinder 32 has a cylindrical shape that is open at the top and bottom and extends in the vertical direction. The lower end of the inner cylinder 32 passes through the bent portion of the L-shaped joint 35 and protrudes downward. The upper end of the inner cylinder 32 is installed so as to be slightly lower in height than the upper end of the outer cylinder 33.

[0027] The outer cylinder 33 is connected upward onto the L-shaped joint 35 and is fitted to cover the upper part of the inner cylinder 32. The outer cylinder 33 has a cylindrical shape that is open at the top and bottom, and the upper end is covered with a cap 34 to form a supply section 31 that is partitioned off from the outside.

[0028] When water is poured into water inlet 21 of the jet section configured as above, the water is supplied to outer cylinder 33 via L-shaped joint 25 and L-shaped joint 35. When further water is poured in, the water level in water inlet 21 exceeds the height of the upper end of inner cylinder 32, and further exceeds the height of cap 34, water enters inner cylinder 32 from outer cylinder 33 and flows out from the lower end of inner cylinder 32. This starts a siphon in supply section 31, and water is supplied to negative pressure generating section 41.

[0029] The diameter of the inner cylinder 32 and the diameter of the outer cylinder 33 are appropriately set to a balance that makes it easy to start the siphon. If the inner diameter of the outer cylinder 33 is close to the outer diameter of the inner cylinder 32, the amount of water supplied to the inner cylinder 32 may be insufficient, and the siphon may not be obtained. Also, even if the outer diameter of the inner cylinder 32 and the inner diameter of the outer cylinder 33 are appropriately balanced, if the inner diameter of the inner cylinder 32 is too small, even if the siphon is started, sufficient water cannot be supplied to the negative pressure generating unit 41 described later, and sufficient negative pressure cannot be obtained. To avoid these cases, the diameters of the inner cylinder 32 and the outer cylinder 33 are respectively set.

[0030] The lengths of the inner tube 32 and the outer tube 33, i.e., the height of the supply section 31, can also be set as appropriate, but if the height of the supply section 31 is lower than the reduced diameter portion of the reduced diameter section 24 of the water injection section 21, the first valve 23 described below cannot be turned on and the siphon will start. Also, if the height of the supply section 31 is higher than the height of the water injection tank 22 of the water injection section 21, the water that has flowed into the outer tube 33 cannot overflow the inner tube 32 even if water is injected, and the siphon will not start. For this reason, the height of the supply section 31 is desirably between the height of the reduced diameter portion of the reduced diameter section 24 and the upper end of the water injection tank 22, and it is preferable to set the height at which an amount of water that can obtain stable pumping can be supplied to the negative pressure generating section 41.

[0031] The negative pressure generating unit 41 is a part that generates negative pressure by using the water flow from the supply unit 31, and is disposed between the upstream transfer pipe 11 on the storage unit 3 side and the downstream transfer pipe 12 on the transfer destination side. The negative pressure generating unit 41 includes a diameter reducing unit 42, a diameter reducing pipe 43, and a T-shaped joint 44. The diameter reducing unit 42 is connected to the lower end of the inner tube 32 of the supply unit 31. The lower end of the diameter reducing unit 42 is structured so as to be connectable to the diameter reducing pipe 43 disposed in the T-shaped joint 44. The diameter reducing unit 42 narrows the flow path to increase the flow rate of the water flowing from the inner tube 32, and generates a jet from the diameter reducing pipe 43. The diameter reducing unit 42 and the diameter reducing pipe 43 constitute a part of the jet part that jets the fluid to the negative pressure generating unit 41.

[0032] The T-joint 44 is composed of a branch pipe section 44a and a straight pipe section 44b. The branch pipe section 44a is shaped so that the upstream transfer pipe 11 including the lift pipe 13 can be connected to the storage section 3 covered by the foundation 2 or the like, and constitutes an inlet for letting water flow into the negative pressure generating section 41. The branch pipe section 44a is connected perpendicularly to the longitudinal middle section of the straight pipe section 44b. The T-joint 44 is arranged so that the straight pipe section 44b extends vertically.

[0033] The straight pipe section 44b has a shape that allows the downstream transfer pipe 12 extending to the transfer destination 50 to be connected thereto, and constitutes an outlet for discharging water to the transfer destination 50. A diameter-reduced pipe 43 having a smaller diameter than the inner diameter of the T-shaped joint 44 is provided at the upper inner part of the straight pipe section 44b. The diameter-reduced pipe 43 opens into the inside of the negative pressure generating section 41 and constitutes a jet pipe for jetting fluid into the negative pressure generating section 41. The diameter-reduced pipe 43 is connected to the lower end of the diameter-reduced section 42 and is formed to a length that does not hinder the inflow from the upstream transfer pipe 11. Specifically, the lower end height of the diameter-reduced pipe 43 is approximately equal to the height of the upper edge of the branch pipe section 44a so that the lower end (lower end of the jet pipe) of the diameter-reduced pipe 43 does not interfere with the extension line portion of the branch pipe section 44a (the inlet of the negative pressure generating section 41). The lower end height of the diameter-reduced pipe 43 may be located slightly higher than the height of the upper edge of the branch pipe section 44a.

[0034] The water W is transferred from the negative pressure generating unit 41 to the transfer destination 50 through the downstream transfer pipe 12 connected downward from the T-shaped joint 44 of the negative pressure generating unit 41, and the L-shaped joint 15 connected to the lower end of the transfer pipe 11. The upper end of the outlet of the L-shaped joint 15 is located at a lower position than the lower end of the lift pipe 13. In this way, by setting the upper end of the discharge outlet of the L-shaped joint 15 lower than the upstream end of the upstream transfer pipe 11, a water conveyance flow path can be formed from the upstream end of the lift pipe 13 installed near the bottom of the storage tank 3 to the bottom of the storage tank 3, allowing the maximum amount of water at the bottom of the storage tank 3 to be transported to the destination 50.

[0035] For each member other than the first valve 23 in the above-mentioned fluid transfer device 1, a pipe, a joint, etc. made of rigid polyvinyl chloride can be suitably used. However, the material is not limited to rigid polyvinyl chloride, and pipes and joints made of other resins may be used, or materials other than resin, such as metal, may be used. Also, although the pipes, joints, etc. have a circular cross section, the shape is not limited to a circular shape.

[0036] Next, the start-up state of the siphon of the fluid transfer device 1 according to this embodiment will be described with reference to Figures 3 and 4. Figure 3(a) shows the initial state before use of the fluid transfer device 1. Although not shown, the upstream transfer pipe 11 on the side of the storage section 3 where the water W is stored is connected to the branch pipe section 44a of the negative pressure generating section 41, and the downstream transfer pipe 12 on the side of the transfer destination 50 is connected to the straight pipe section 44b.

[0037] When starting the siphon of the fluid transfer device 1, first, as shown in Fig. 3(b), water is poured into the water pouring section 21. At the initial stage of water pouring, the water level in the water pouring section 21 and the water level in the supply section 31 are the same, but the water pouring is stopped when the water level is higher than the reduced diameter portion of the reduced diameter section 24 and lower than the upper end of the inner tube 32 of the supply section 31.

[0038] 3(c), the first valve 23 is placed in the water injection tank 22 of the water injection section 21. At this time, the first valve 23 is in a state of floating on the water at a position higher than the reduced diameter portion of the reduced diameter section 24.

[0039] 3(d), water injection is resumed into water injection section 21. When the water level in water injection section 21 exceeds the height of the upper end of inner cylinder 32 of supply section 31, water starts to flow into inner cylinder 32.

[0040] As shown in (d) of FIG. 3 to (a) of FIG. 4, by continuing to inject more water into the water injection tank 22 than the amount of water flowing into the inner tube 32 of the supply unit 31, the outer tube 33 of the supply unit 31 becomes full of water, causing a siphoning phenomenon. Due to this siphoning phenomenon, water from the water injection unit 21 is forcefully supplied to the negative pressure generating unit 41 through the inner tube 32 of the supply unit 31, and then supplied to the downstream transfer pipe 12. At that time, although not shown in this figure, the flow of water is obstructed by the L-shaped joint 15 connected to the lower end of the downstream transfer pipe 12 as shown in FIG. 1, so that the downstream transfer pipe 12 is easily filled with water. On the other hand, when water passes through the reduced diameter part 42 and the reduced diameter pipe 43 of the negative pressure generating unit 41, the flow path narrows, thereby increasing the flow rate, and negative pressure is generated in the upstream transfer pipe 11 connected to the branch pipe part 44a of the T-shaped joint 44 due to the Venturi effect.

[0041] 4(b), when the supply of water from the supply unit 31 to the negative pressure generating unit 41 continues, the water W stored in the storage unit 3 starts to be pumped from the pumping pipe 13 of the upstream transfer pipe 11, and the upstream transfer pipe 11 soon becomes filled with the pumped water W, which is then discharged to the transfer destination 50 via the downstream transfer pipe 12. Here, the injection of water into the water injection unit 21 continues until it is confirmed that the water W in the storage unit 3 has been discharged to the transfer destination 50. Note that the injection of water into the water injection unit 21 may be performed by injecting an amount of water into the water injection unit 21 such that the water W in the storage unit 3 is discharged to the transfer destination 50, until the first valve 23 closes the reduced diameter portion 24 of the water injection unit 21.

[0042] As shown in FIG. 4(c), when the injection of water into the water injection section 21 is stopped, the water level in the water injection section 21 drops below the water level in the supply section 31 due to the siphon phenomenon occurring in the supply section 31. When the water level in the water injection section 21 reaches the narrowing diameter section of the narrowing diameter section 24, the first valve 23 comes into close contact with the inner circumferential surface of the narrowing diameter section 24 and closes the narrowing diameter section 24. Here, the supply of water from the supply section 31 to the negative pressure generating section 41 stops, but since the insides of the upstream transfer pipe 11 and the downstream transfer pipe 12 are filled with water, a new siphon phenomenon occurs from the storage section 3 to the transfer destination 50. In addition, due to this new siphon phenomenon, the inside of the supply section 31 becomes negative pressure, but since the narrowing diameter section 24 is closed by the first valve 23, the water in the supply section 31 does not move. Furthermore, the first valve 23 is pulled toward the supply section 31 and maintains the state in which the narrowing diameter section 24 is closed.

[0043] Next, the function and effect of the downstream transfer pipe 12 and the L-shaped joint 15 will be described. The downstream transfer pipe 12 and the L-shaped joint 15 play a role in facilitating the generation of negative pressure in the negative pressure generating section 41 of the fluid transfer device 1, and in transferring the water W in the storage section 3 to the transfer destination 50. To efficiently generate negative pressure in the negative pressure generating section 41, it is important to fill the inside of the downstream transfer pipe 12 with water. If the inside of the downstream transfer pipe 12 is not sufficiently filled, this may lead to a decrease in negative pressure or the generation of negative pressure not occurring.

[0044] One method of filling the inside of the downstream transfer pipe 12 with water is to narrow the flow path by reducing the diameter of the downstream transfer pipe 12 at any point from the upper end to the lower end. However, since the downstream transfer pipe 12 also serves to transport water W from the storage section 3, reducing the diameter of the downstream transfer pipe 12 would lead to a reduction in the amount of water W transported from the storage section 3, which is not preferable.

[0045] In order to make it easier to fill the inside of the downstream transfer pipe 12 with water W without impeding the transfer of water W from the storage section 3, it is desirable to bend the lower end of the downstream transfer pipe 12 (attach an L-shaped joint 15 to the lower end of the downstream transfer pipe 12).

[0046] As a result, water that has passed from the supply section 31 through the negative pressure generating section 41 flows down the downstream transfer pipe 12, but by providing an L-shaped joint 15 and changing the flow of water, it becomes easier to fill the downstream transfer pipe 12 with water, and it is possible to minimize the reduction in the amount of water W transferred from the storage section 3.

[0047] As described above, by using the fluid transfer device 1, a new siphon can be constructed from the storage section 3 to the transfer destination 50, and the transfer of water can be continued without air entering the new siphon by the first valve 23. The transfer of water continues until the water level in the storage section 3 decreases, causing air to enter the upstream transfer pipe 11.

[0048] That is, according to the fluid transfer device 1 of this embodiment, the water W in the storage section 3 can be sucked up to a predetermined water level by the transfer pipe 10 simply by injecting water into the water injection section 21 of the pressure generating means 20. This activates a siphon in the transfer pipe 10, and the water W in the storage section 3 is automatically transferred to the transfer destination 50. Therefore, such a fluid transfer device 1 does not require a power source and has a compact configuration.

[0049] Furthermore, in this embodiment, pressure generating means 20 includes water injection tank 22, so that water can be stably supplied to negative pressure generating section 41. Since a first valve 23 (plug member) that floats on water is placed in water injection tank 22, water injection section 21 is automatically closed when the water level in water injection tank 22 drops. Closing water injection section 21 prevents air from flowing from water injection section 21 into transfer tube 10, so that siphoning in transfer tube 10 continues stably without interruption.

[0050] Furthermore, in this embodiment, an L-shaped joint 15 (resistance portion) that reduces the flow rate of water is formed at the downstream end of the downstream transfer pipe 12, so that a water plug is formed inside the downstream end of the downstream transfer pipe 12. This prevents air from flowing in from the downstream end of the downstream transfer pipe 12. This makes it easier to reduce the pressure in the negative pressure generating portion 41, making it easier to suck up the fluid from the storage portion 3. Furthermore, since air is less likely to flow in the transfer pipe 10, the siphon in the transfer pipe 10 can be stably maintained.

[0051] In addition, since the pressure generating means 20 is provided at a portion where the transfer pipe 10 climbs over the peripheral wall of the storage section 3, the length of the upstream transfer pipe 11 from the storage section 3 to the pressure generating means 20 can be short. This makes it easier to suck up water from the storage section 3. Furthermore, since the pressure generating means 20 is provided at a position higher than the upper end of the peripheral wall of the storage section 3, a certain distance or more can be secured from the pressure generating means 20 to the lower end of the downstream transfer pipe 12. This increases the amount of reduced pressure in the negative pressure generating section 41, making it easier to suck up water from the storage section 3. This makes it easier to start the siphon.

[0052] Furthermore, since the lower end of the diameter-reducing tube 43 is positioned at a position that does not interfere with the branch pipe section 44a (inlet) of the negative pressure generating section 41, the diameter-reducing tube 43 does not obstruct the flow of water within the transfer pipe 10, thereby maximizing the amount of water transferred.

[0053] Furthermore, since the downstream transfer pipe 12 extends downward for a predetermined length continuous with the negative pressure generating section 41, the flow rate of the water in the downstream transfer pipe 12 increases, making it easier to reduce the pressure in the negative pressure generating section 41.

[0054] Next, the pressure generating means 20 of the fluid transfer device 1 according to the first embodiment of the present invention will be described in detail with reference to the following examples. In each example, the main components constituting the fluid transfer device 1 are products manufactured by Maezawa Chemical Industries, Ltd., and the descriptions will be given using the product names of this company.

[0055] <Example 1> <Water injection section 21> First, in Example 1, a 300 mm long straight pipe VU100 serving as water injection tank 22 is inserted into a receiving port of VU increaser VUIN100×50 with a nominal diameter of 100 serving as diameter-reducing section 24. Next, a 50 mm long straight pipe VU50 is inserted into a receiving port of VUIN100×50 with a nominal diameter of 50, and a VU elbow VUL50 serving as an L-shaped joint 25 is inserted into the other end of VU50 to form water injection section 21.

[0056] <Supply section 31> Next, a hole of the same diameter as the outer diameter of VP25 is drilled in the outer curved part of VUL50 so that the straight pipe VP25 can penetrate and be fixed centrally and parallel to the socket on one side of VUL50. VP25 with a length of 290 mm is inserted into the drilled hole of VUL50 and fixed using adhesive or the like so that the upper end of VP25 is located near the upper end of outer tube 33 described below to form inner tube 32. VU50 with a length of 190 mm is inserted into the socket of VUL50 on the VP25 penetration side to form outer tube 33. Furthermore, DV cap DVC50 is inserted into the upper end surface of VU50, which is outer tube 33, to form supply part 31.

[0057] <Negative pressure generating unit 41> Next, the socket of the TS reduced diameter socket TS25×16 as the reduced diameter part 45 with a nominal diameter of 16 is inserted and fixed into the socket on one side of the straight direction of the TS reduced diameter tee TT25×20 as the T-shaped joint 44, but the straight pipe VP25 as the reduced diameter pipe 43 cut to a length such that the end is located at the center of the length of the straight part of the TT25×20 when the TS25×16 is inserted into the socket of the TT25×20 with a nominal diameter of 16 is inserted in advance. The TS25×16 with the VP16 inserted is inserted into the TT25×20 and fixed to form the negative pressure generating part 41. When fixing, it is sufficient to have no gap through which air can enter, and an adhesive or caulking agent, or an O-ring or packing may be used.

[0058] <First Valve 23> For the first valve 23, a hollow rubber sphere having an outer diameter of about 60 mm, which is commercially available at hardware stores, was used.

[0059] <Fluid transfer device 1> The VUL50 of the water injection unit 21 and the VUL50 of the supply unit 31 are connected using a VU50 with a length of 50 mm. Next, the nominal diameter 25 socket of the TS25×16 of the negative pressure generating unit 41 is inserted into the end of the VP25, which is the inner cylinder 32 penetrating from the VUL50 of the supply unit 31, to complete the fluid transfer device 1.

[0060] <Negative pressure measurement> As shown in FIG. 5, a VP25 with a length of 550 mm is connected as the downstream transfer pipe 12 to the lower end of the TT25×20 with a nominal diameter of 25 used in the negative pressure generating section 41 of the fluid transfer device 1, and two TS elbows TL25 are connected to the lower end of the VP25 as L-shaped joints 15 to form a crank shape. At this time, the height from the lower end of the branch pipe section 44a of the TT25×20 to the lower end of the TL25 is about 600 mm. Next, a straight pipe VP20 with a length of 450 mm is connected to the branch pipe section 44a of the TT25×20 as a horizontal pipe of the upstream transfer pipe 11, and the other end of the VP20 is connected to the TL20 so that it rises upward. Furthermore, a negative pressure gauge 60 is connected to the upper receiving port of the TL20 to form a device configuration for measuring negative pressure.

[0061] Next, water was poured into the water injection section 21 of the pressure generating means 20, and the negative pressure generated as the water passed through the negative pressure generating section 41 was measured. The amount of water poured was 5 L, and the water injection speed was such that after the siphon of the supply section 31 was activated, water was poured in just enough to maintain the water level in the water injection section 21, and the negative pressure was measured while the water was passing through the negative pressure generating section 41 without using the first valve 23.

[0062] <Transfer amount measurement> As shown in Fig. 6, the basic configuration is the same as for the negative pressure measurement, but the TL20 connected to the VP20 of the lifting pipe 13 used for the negative pressure measurement is connected facing downward, and a VP20 with a length of 480 mm is further connected as a standpipe of the lifting pipe 42. At this time, the height from the bottom end of the horizontal pipe of the lifting pipe 42 to the bottom end of the standpipe is about 500 mm. In addition, the standpipe of the lifting pipe 42 is inserted into an acrylic container with inner dimensions of W500 x D100 x H430 mm (capacity 21.5 L) that imitates the storage section 40 and is open at the top.

[0063] Next, water is stored in an acrylic container 61 simulating the storage section 3, and the amount of water pumped when the fluid transfer device 1 is started is measured. After water is poured into the water injection section 21 to a level that does not exceed the upper end of the inner tube 32 of the supply section 31, the first valve 23 is inserted into the water injection section 21. Thereafter, 4 L of water is further poured into the water injection section 21, and the siphon of the fluid transfer device 1 is started, but the water injection speed is set to a level that maintains the water level of the water injection section 21 after the siphon of the supply section 31 is started. In addition, measurements were performed to measure and observe the time it takes for the water in the acrylic container to decrease by 5 L from 17 L to 12 L after storing 20 L (height 400 mm) of water in the acrylic container and starting the fluid transfer device 1, and whether the water in the acrylic container can be transferred when 5 L of water (height 100 mm) is stored in the acrylic container and the fluid transfer device 1 is started.

[0064] <Example 2> In the second embodiment, the water injection speed in the negative pressure measurement and the transfer amount measurement in the first embodiment is changed from the injection of water only enough to maintain the water level in the water injection section 21 to the injection of the entire amount of water so vigorously that the water level in the water injection section 21 rises. The rest is the same as in the first embodiment.

[0065] <Example 3> In the third embodiment, the length of the VP16 used in the reduced diameter pipe 43 of the negative pressure generating section 41 in the first embodiment is changed from a length in which the end is located at the center of the length of the straight section of the TT25×20 to a length in which the end is at the same height as the top surface of the branch pipe section 44a so as not to obstruct the inflow from the lift pipe 13. Other than that, the third embodiment is the same as the first embodiment.

[0066] <Example 4> In the fourth embodiment, the length of the reduced diameter tube 43 of the negative pressure generating section 41 in the second embodiment is the same as that in the third embodiment.

[0067] <Example 5> In Example 5, the T-shaped joint 44 of the negative pressure generating section 41 in Example 1 was changed from TT25x20 to TS tee TT25, the length of the reduced diameter pipe 43 was changed to the same length as in Example 3, the horizontal pipe and standpipe of the lift pipe 13 were changed from VP20 to VP25, and the TS elbow was changed from TL20 to TL25. Other than that, it was the same as Example 1.

[0068] <Example 6> In Example 6, the water injection speed in the negative pressure measurement and the transfer amount measurement in Example 5 was the same as in Example 2. Other than that, Example 6 was the same as Example 5.

[0069] <Example 7> In Example 7, the length of the VU 100 used in the water injection tank 22 of the water injection section 21 in Example 5 was changed from 300 mm to 230 mm, the length of the VP 25 used in the inner cylinder 32 of the supply section 31 was changed from 290 mm to 180 mm, and the length of the VU 50 used in the outer cylinder 33 was changed from 190 mm to 80 mm.

[0070] <Example 8> In Example 8, the water injection rate of Example 7 was the same as that of Example 2. Other than that, Example 8 was the same as Example 7.

[0071] <Example 9> In Example 9, except for the reduced diameter portion 42 and reduced diameter tube 43 of the negative pressure generating unit 41 of Example 2, a T-shaped joint 44, TT25×20, was directly connected to the lower end of the inner tube 32 of the supply unit 31. The rest was the same as Example 2.

[0072] <Example 10> In the tenth embodiment, the diameter-reducing tube 43 of the negative pressure generating section 41 in the first embodiment is omitted. The rest is the same as in the first embodiment.

[0073] <Example 11> In the eleventh embodiment, the diameter-reducing tube 43 of the negative pressure generating section 41 in the second embodiment is omitted. The rest is the same as in the second embodiment. The results for each example are shown in Table 1.

[0074] [Table 1]

[0075] <Result> In each of Examples 1 to 8, pumping was observed in all of the five measurements of the transfer amount. Comparing Examples 1 and 2, Examples 3 and 4, Examples 5 and 6, and Examples 7 and 8, it is possible to obtain a consistent and stable negative pressure regardless of the difference in water injection speed. In addition, water can be pumped even when the initial water level in the storage section 3 is low, and the pumping conditions are stable.

[0076] Comparing Examples 1 and 2 with Examples 3 and 4, in Examples 3 and 4, even though the position of the lower end of the reduced diameter pipe 43 was located at a position high enough so as not to obstruct the inflow of water from the rise pipe 13, there was no difference in the amount of negative pressure generated, and the inflow of water from the rise pipe 13 was not obstructed, improving the flow rate.

[0077] Comparing Examples 3-4 with Examples 5-6, in Examples 5-6, the nominal diameter of the lift pipe 13 was changed from 20 to 25, which increased the inner pipe diameter and further improved the flow rate.

[0078] Comparing Examples 5-6 with Examples 7-8, in Examples 7-8, the length of the outer tube 33 is shorter, i.e., the height of the supply portion 31 is lowered, but the same effect can be obtained regardless of the height of the supply portion 31.

[0079] What is common to all of the embodiments 1 to 8 is that the siphon generated in the supply section 31 allows a stable amount of water to be supplied to the negative pressure generating section 41 regardless of the water injection speed, and that the negative pressure generating section 41 can stably generate negative pressure, thereby achieving stable pumping regardless of the water level in the storage section 3.

[0080] On the other hand, comparing Examples 1 and 2 with Example 9, in Example 9, the diameter-reduced portion 42 and diameter-reduced pipe 43 of the negative pressure generating portion 41 were omitted, so that the generated negative pressure was small, and the pointer indicated by the negative pressure gauge 60 also fluctuated greatly. The pumping speed was slow and unstable, but when the first valve 23 closed the diameter-reduced portion 24, a large negative pressure was generated instantaneously, causing a sudden pumping, and the transfer of water was started. Therefore, once the transfer of water started, a flow rate equivalent to that of Examples 1 and 2 was obtained, and a certain action and effect could be obtained, but it was considered that there was a possibility that pumping would not be possible, especially when the initial water level of the storage portion 3 was low.

[0081] Comparing Examples 1-2, Example 9, and Examples 10-11, in Examples 10-11, the diameter-reduced portion 42 of the negative pressure generating section 41 was left but the diameter-reduced tube 43 was removed, so a larger negative pressure was generated compared to Example 1 but not as much as in Examples 1-2, and the fluctuation of the pointer of the negative pressure gauge 60 was smaller compared to Example 9, but the stability of the pointer as in Examples 1-2 was not obtained. Compared to Example 9, Examples 10-11 were able to obtain stable pumping and certain operational effects, but in order to obtain a more stable pumping and transport of water, Examples 1-2 in which the diameter-reduced tube 43 is present are more suitable.

[0082] As described above, according to the fluid transfer device 1 of this embodiment, it is possible to pump and transfer water in the storage section 3 with a simple operation such as pouring water into the water injection section 21 without using a power source.

[0083] <Variation 1> Next, the configuration of a fluid transfer device 1a according to Modification 1 will be described with reference to Fig. 7. In the fluid transfer device 1a of Modification 1, the supply unit 31 is omitted from the fluid transfer device 1 of Fig. 2, and the water injection unit 21 and the negative pressure generating unit 41 are directly connected. In other words, this is an example in which the water injection unit 21 also serves as the supply unit 31.

[0084] In the fluid transfer device 1 of the first modification, water is supplied to the negative pressure generating unit 41 at the same time as water is poured into the water injection unit 21. Water can be transferred by pouring water until the water pumped from the reservoir by the negative pressure generated by the negative pressure generating unit 41 reaches the T-shaped joint 44 of the negative pressure generating unit 41. The first valve 23 may be turned on while water is being poured into the water injection unit 21, or may be turned on at the same time as the water injection is completed. The other configurations are the same as those in FIG. 2, so the same reference numerals are used and the description will be omitted.

[0085] Next, the first modified example of the fluid transfer device according to the first embodiment of the present invention will be described in detail with reference to the following examples.

[0086] <Example 12> In Example 12, the lower end socket of a VUIN100×50 with a nominal diameter of 50 used in the reduced diameter section 24 of the water injection section 21 is connected to the socket of a TS different diameter socket TS50×25 with a nominal diameter of 50. The socket of the TS50×25 with a nominal diameter of 25 is joined to the negative pressure generating section 41 to form a fluid transfer device 1a without the supply section 31. The other configurations and test methods are the same as those of Example 1.

[0087] <Example 13> In Example 13, the water injection speed in the negative pressure measurement and the transfer amount measurement in Example 12 were the same as in Example 2. Other than that, Example 13 was the same as Example 12.

[0088] <Example 14> In the embodiment 14, the length of the VP16 used in the reduced diameter tube 43 of the negative pressure generating section 41 in the embodiment 12 is the same as that in the embodiment 3. The rest is the same as in the embodiment 12.

[0089] <Example 15> In the embodiment 15, the length of the reduced diameter tube 43 of the negative pressure generating section 41 of the embodiment 13 is the same as that of the embodiment 3. Other than that, the embodiment 15 is the same as the embodiment 13.

[0090] <Example 16> In Example 16, except for the reduced diameter portion 42 and reduced diameter pipe 43 of the negative pressure generating portion 41 of Example 13, a T-shaped joint 44, TT25×20, was directly connected to the lower end of the water injection portion 21. The rest was the same as Example 13.

[0091] <Example 17> In the seventeenth embodiment, the diameter-reducing tube 43 of the negative pressure generating section 41 in the twelfth embodiment is omitted. The rest is the same as in the twelfth embodiment.

[0092] <Example 18> The eighteenth embodiment is similar to the thirteenth embodiment, except that the reduced diameter tube 43 of the negative pressure generating section 41 of the thirteenth embodiment is omitted.

[0093] The results for each example are shown in Table 2.

[0094] [Table 2]

[0095] <Result> In Example 12, pumping was not possible in three out of five measurements of the transfer amount. In Example 13, pumping was possible in all of five measurements of the transfer amount. In Modification 1, water supply to negative pressure generating section 41 begins at the same time as water injection into water injection section 21 begins, but it is difficult to perform water injection operations to maintain the water level in water injection section 21 as in Example 12, and the amount of negative pressure generated, i.e., whether or not water can be pumped, depends on the skill of the operator. However, if water injection operations are performed to pour in the entire specified amount as in Example 13, an effect equivalent to that of Example 2 can be obtained.

[0096] In Example 14, pumping was not possible in three out of five measurements of the transfer amount. In Example 15, pumping was possible in all of the five measurements of the transfer amount. This is because the results differed depending on the water injection speed, as in Examples 12 and 13.

[0097] Since Example 16 does not have a reduced diameter portion like Example 9, the negative pressure generated is small. Although Examples 17 and 18 are affected by the water injection speed, the negative pressure generated is equivalent to that of Example 11.

[0098] What is common to the 12th to 15th embodiments is that if water can be appropriately supplied to the negative pressure generating section 41, water can be pumped up, and the same effect as in the 1st to 4th embodiments can be obtained. In the present modified example 1, in order to appropriately supply water to the negative pressure generating section 41, for example, a method of providing a ball valve or the like at the lower end of the reduced diameter section 24 of the water supply section 21 and filling the water with the valve closed, or a method of providing a hemispherical float valve used in toilet tanks and the like and filling the water, storing a sufficient amount of water in the water supply section 21 in advance, and opening the ball valve, opening the float valve with a lever, or the like can be solved. When using a ball valve, the water can be transferred by turning on the first valve 23 after filling the water and opening the ball valve, or by opening the ball valve without using the first valve 23 and then closing the ball valve while determining the balance between the water level in the water supply section 21 and the water pumping. When a float valve is used, once the float valve is opened, the float valve closes as the water level drops, making the first valve 23 unnecessary.

[0099] The same can be said for Examples 16 to 18, but even if water is supplied appropriately to the negative pressure generating section 41, the results will be similar to those of Examples 9 to 11, and it is preferable to have a reduced diameter tube 43 in order to obtain stable water transfer.

[0100] <Variation 2> Next, the configuration of a fluid transfer device 1b according to Modification 2 will be described with reference to Fig. 8. The fluid transfer device 1b of Modification 2 differs from the fluid transfer device 1 of Fig. 2 in that the supply unit 31 including the inner cylinder 32 and the outer cylinder 33 is replaced with an S-trap structure 28 that combines a straight pipe and an L-shaped joint.

[0101] In the fluid transfer device 1b, as shown in Fig. 8, the water injection section 21 is raised upward from the lower end of the reduced diameter section 24 by an L-shaped joint and a straight pipe, and is lowered from the top of the S trap structure 28 by an L-shaped joint and a straight pipe to be connected to the negative pressure generating section 41. At this time, the top of the S trap structure 28 is set between the height of the reduced diameter part of the reduced diameter section 24 and the upper end of the water injection tank 22, as in the embodiment shown in Fig. 2. The connection part with the negative pressure generating section 41 is set to be at the same position as or lower than the lower end of the S trap structure 28. The other configurations are the same as those in Fig. 2, so the same reference numerals are used and explanations are omitted.

[0102] Next, a second modified example of the fluid transfer device according to the first embodiment of the present invention will be described in detail with reference to the following example.

[0103] <Example 19> In Example 19, the lower end of the VUIN100×50 used in the reduced diameter portion 24 of the water injection portion 21 is connected to the socket of the TS socket with a nominal diameter of 50, which is a TS socket with a nominal diameter of 50. Two TL25s are connected to the socket of the TS50×25 with a nominal diameter of 25 in a U-shape. A VP25 with a length of 290 mm is connected to the other end of the U-shape portion, and two TL25s are further connected to an inverted U-shape. A VP25 with a length of 340 mm is connected to the other end of the inverted U-shape portion to form an S-trap structure 28, which is the supply portion in the fluid transfer device 1b. A negative pressure generating portion 41 is connected to the end of the S-trap to form the fluid transfer device 1b. The other configurations and test methods are the same as those of Example 1.

[0104] <Example 20> Example 20 is the same as Example 19, except that the water injection rate in the negative pressure measurement and the transfer amount measurement in Example 19 was the same as in Example 2.

[0105] <Example 21> Example 21 is the same as Example 19, except that the length of VP16 used in the reduced diameter tube 43 of the negative pressure generating section 41 in Example 19 is the same as in Example 3.

[0106] <Example 22> The twenty-second embodiment is the same as the twenty-second embodiment, except that the length of the reduced diameter tube 43 of the negative pressure generating section 41 in the twenty-second embodiment is the same as that in the third embodiment.

[0107] <Example 23> Example 23 is the same as Example 20, except that the reduced diameter section 42 and reduced diameter tube 43 of the negative pressure generating section 41 of Example 20 are excluded, and a T-shaped joint 44, TT25×20, is directly connected to the terminal end of the S-trap structure 28.

[0108] <Example 24> The twenty-fourth embodiment is similar to the nineteenth embodiment, except that the reduced diameter tube 43 of the negative pressure generating section 41 of the nineteenth embodiment is omitted.

[0109] <Example 25> The embodiment 25 is the same as the embodiment 20, except that the reduced diameter tube 43 of the negative pressure generating section 41 of the embodiment 20 is omitted.

[0110] The results for each example are shown in Table 3.

[0111] [Table 3]

[0112] <Result> In Examples 19 to 22, pumping was observed in all of the five transfer measurements. In the present modified example 2, water injected into the water injection section 21 is supplied to the negative pressure generating section 41 by a siphon generated by the S trap structure 28. The negative pressure generated in the negative pressure generating section 41 makes it possible to pump water from the storage section 3.

[0113] Similarly, the results are somewhat unstable compared to Examples 1 to 4 in which water is supplied to negative pressure generating section 41 by the siphon effect. This is because the flow path with nominal diameter 25 of supply section 31 in Examples 19 to 22 is longer than in Examples 1 to 4, resulting in a decrease in flow rate and pressure loss before water is supplied to negative pressure generating section 41. This can also be seen from the fact that, compared to Examples 1 to 4, there is a slight decrease in negative pressure and fluctuations in the negative pressure gauge pointer in Examples 16 to 22.

[0114] Examples 23 to 25 have the same results as Examples 9 to 11, and the presence of the reduced diameter pipe 43 is more preferable for stabilizing the pumping and transport of water.

[0115] As described above with respect to the first and second modifications, the fluid transfer devices 1a and 1b are also capable of transferring water in the same manner as the fluid transfer device 1 described above.

[0116] Next, a fluid transfer device 1c according to a second embodiment will be described with reference to FIG. In order to further increase the amount of water transferred from the storage section 3 by the fluid transfer device 1 of the first embodiment, the diameter of each component that constitutes the fluid transfer device 1, the transfer pipe 10, can be increased, but other measures include adding a pumping path to the fluid transfer device 1.

[0117] Based on this idea, in the fluid transfer device 1c of the second embodiment, as shown in Figure 9(a), the lower end of the water injection section 21 is branched off at a T-shaped joint 29, and a supply section 31 and a negative pressure generating section 41 are connected to both ends of the branched joint, respectively.

[0118] Alternatively, as a fluid transfer device 1d according to a modified example of the second embodiment, the lower end of the supply unit 31 may be branched off at a T-shaped joint 36, and negative pressure generating units 41 may be connected to both ends of the branched off joint, as shown in FIG. 9(b).

[0119] According to such a configuration, pumping water can be obtained from two systems by injecting water into the water injection section 21, so that the amount of water transported can be increased.

[0120] Next, a fluid transfer device 1e according to a third embodiment will be described with reference to FIG. As mentioned above, in order to increase the amount of water transferred from the storage section 3, it is possible to increase the size of the device configuration or to add a pumping path by branching the device, but other options include removing the water injection section 21 and supply section 31 from the fluid transfer device 1 and using them in a separate location.

[0121] 10, in the fluid transfer device 1e of the third embodiment, a valve 70 is provided between a supply unit 31 and a negative pressure generating unit 41. The supply unit 31 and the valve 70 (second valve) are configured to be separable from each other without being bonded with adhesive or the like.

[0122] According to this configuration, water can be supplied to the negative pressure generating unit 41 by injecting water into the water injection unit 21 with the valve 70 (second valve) open, and water W is transferred from the storage unit 3 in the same manner as in the fluid transfer device 1. Then, by closing the valve 70 (second valve) while water is being transferred in the transfer pipe 10, the water injection unit 21 and the supply unit 31 can be removed while maintaining the siphon in the transfer pipe 10. In other words, it is possible to continue the transfer of water without air entering the transfer path from the storage unit 3 to the transfer destination 50.

[0123] Furthermore, a new fluid transfer device can be created by connecting the removed water injection unit 21 and supply unit 31 to the newly installed negative pressure generating unit 41, valve 70 (second valve), and transfer pipe 10. As long as the installation space for the transfer pipe 10 and the like allows, water transfer paths can be added and the amount of water transferred can be increased.

[0124] Next, a fluid transfer device 1f according to a fourth embodiment will be described with reference to FIG. Using the fluid transfer device 1 according to the present invention, it is possible to supply water to a temporary facility such as a temporary toilet by transferring water from a storage unit such as a pool or a water tank. In this case, the siphon is maintained and the transfer of water continues until the water level in the storage unit 3 falls below the lower end of the lift pipe 13 installed in the storage unit 3, which may cause overflow at the destination.

[0125] Therefore, in the fourth embodiment, a fluid transfer device 1f is devised that is configured to be able to stop the transfer of water in a desired state. As shown in FIG. 11(a), the fluid transfer device 1f is provided with a valve 71 at the lower end of the downstream transfer pipe 12. If the valve 71 is open, water can be transferred by injecting water into the water injection section 21, as in the previous embodiments. In this embodiment, however, the transfer of water can be stopped by closing the valve 71 while the water is being transferred from the storage section. At this time, the inside of the transfer pipe 10 is filled with water, so that the siphon phenomenon is in a standby state, and the siphon phenomenon, i.e., the transfer of water, is resumed by opening the valve 71 again. With this configuration, it is possible to transfer any amount of water, and it is possible to prevent overflow at the transfer destination.

[0126] In addition, as shown in Fig. 11(b), a fluid transfer device 1g according to a modification of the fourth embodiment is an example in which a ball tap 76 is provided instead of the valve provided at the lower end of the downstream transfer pipe 12 shown in Fig. 11(a). The ball tap 76 includes a float 77 provided in a storage tank 75 at the transfer destination, and a valve portion 78 that opens and closes in accordance with the rise and fall of the float 77.

[0127] According to the fluid transfer device 1g having such a configuration, as in each of the above-described embodiments, water can be transferred by injecting water into the water injection section 21, but as the water level in the storage tank 75 provided at the transfer destination rises, the float 77 rises and the valve of the valve section 78 closes, stopping the transfer of water. At this time, the inside of the transfer pipe 10 is filled with water, so it is in a state of waiting for the siphon phenomenon. When the water level in the storage tank 75 drops, the float 77 also drops, the valve opens, and the transfer of water resumes. With such a configuration, water can be transferred in response to fluctuations in the water level in the storage tank 75 at the transfer destination, and overflowing at the transfer destination can be prevented.

[0128] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and appropriate design changes are possible within the scope of the present invention. In the above embodiment, the transport of water stored inside the foundation of a house, i.e., water under the floor, and the transport of water from a pool or water tank are given as examples, but the present invention is not limited to the transport of water under the floor. For example, it can be used for various purposes, such as the transport of water stored in a place underground where it is difficult to drain, or the temporary supply of water to temporary facilities.

[0129] In the above embodiment, the L-shaped joint 15 is provided at the lower end of the downstream transfer pipe 12 to form a resistance portion that reduces the flow rate of water, but the present invention is not limited to this. A reduced diameter pipe, a U-shaped pipe, or a branched pipe may be provided. The position of the resistance portion may be changed as appropriate, and may be located at an intermediate portion other than the downstream end of the downstream transfer pipe. In these cases, if the top of the downstream end of the downstream transfer pipe is lower than the upstream end of the upstream transfer pipe, the siphon phenomenon can be induced. By extending the upstream end of the upstream transfer pipe to the bottom of the storage tank while maintaining the positional relationship between the upstream end of the upstream transfer pipe and the downstream end of the downstream transfer pipe, it is possible to transport as much water as possible to the destination at the bottom of the storage tank.

[0130] In the above embodiment, the first valve and the second valve are provided independently, but the two may be installed simultaneously. In this case, after the water is poured and the transfer from the reservoir is started, the first valve is activated first, and then the second valve can be closed. When only the second valve is used, there is a risk that the water in the water pouring section 21 and the supply section 31 will dry up due to the continued pouring of water depending on the time elapsed after the water is poured, but the first valve can prevent this. In other words, it is possible to prevent unexpected siphoning. In addition, by using the second valve, the above-mentioned function of the second valve can also be achieved. [Explanation of symbols]

[0131] 1 Fluid transfer device 2 Basics 3. Storage section 4 Underfloor inspection hatch 5 Back door 10 Transfer pipe 11 Upstream transfer pipe 12 Downstream transfer pipe 13. Lifting pipe 15 L-shaped joint (resistance part) 20 Pressure generating means 21 Water injection section 22 Water tank 23 First valve (plug member) 24 Reduced diameter part 31 Supply section 32 Inner cylinder 33 Outer cylinder 34 Cap 41 Negative pressure generating section 42 Reduced diameter section (jet section) 43 Reducing diameter pipe (jet section) 44 T-joint 44a Branch pipe section (inlet) 44b Straight pipe section (outlet)

Claims

1. A fluid transfer device having a transfer pipe extending from a storage section that stores a fluid to a transfer destination, and a pressure generating means connected to the transfer pipe and generating a pressure for sucking up the fluid in the storage section to a water level that activates a siphon within the transfer pipe, the pressure generating means includes a negative pressure generating unit disposed between the upstream transfer pipe, which is the storage portion side, and the downstream transfer pipe, which is the transfer destination side; A resistance portion for impeding the flow of water is formed at the lower end of the downstream transfer pipe, The pressure generating means further includes a float-type first valve installed in a liquid storage tank for storing liquid to be supplied to a jet pipe whose downstream end opens into the inside of the negative pressure generating unit, and a second valve for stopping the jet from the jet pipe. A fluid transfer device comprising:

2. The resistor portion has an L-shape. The fluid transfer device according to claim 1 .

3. The pressure generating means is provided with a jet portion that jets a fluid to the negative pressure generating portion.

3. The fluid transfer device according to claim 1 or 2.

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