JP7605611B2 - Fluid Transfer Device - Google Patents

Description

The present invention relates to a fluid transfer device.

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, and 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, they cannot use drainage pumps if there is a power outage or if it is difficult to obtain a pump. Therefore, it is necessary to drain the water manually, but this situation is problematic when the residents are elderly and cannot even perform the drainage work. 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.

A device that uses a siphon to drain water that has accumulated in a given space is known (see, for example, Patent Document 1). When using a siphon to drain water that has 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 comes into play, and the water on the water tank side is drained to the drain tank side. Patent Document 1 discloses a device that, at the flow outlet of the siphon pipe, communicates with the air suction pipe and the top of the siphon via a communication 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.

Another configuration is a drainage system that has a drain hole on the bottom of the foundation that connects to a drain pipe. In this case, a lid is provided on the drain hole to prevent water from backflowing from the drain pipe, and the lid is removed when draining.

Japanese Patent Application Publication No. 5-231397

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 an issue that has emerged as of now. On the other hand, with a drainage device that has a drain pipe installed on the bottom of the foundation, it is very difficult to remove the drain hole cover in the event of flooding, making it difficult to drain water.

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 pools.

Therefore, the present invention was devised to solve the above problems, and aims to provide a fluid transfer device that can generate a siphon phenomenon without the need for a power source and has a compact configuration.

In order to solve the above problem, the present invention 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 pressure to suck up the fluid in the storage section to a water level that activates a siphon within the transfer pipe, wherein the pressure generating means includes a negative pressure generating section that is disposed between the upstream transfer pipe that is on the storage section side and the downstream transfer pipe that is on the transfer destination side, and a resistance section that obstructs the flow of water is formed at the lower end of the downstream transfer pipe, and the pressure generating means includes a float-type first valve that is 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 section, and a second valve that stops the jet from the jet pipe .

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.

In the fluid transfer device of the present invention, the resistance portion is preferably L-shaped.
In the fluid transfer device of the present invention, it is preferable that the pressure generating means includes a jet part for jetting the fluid to the negative pressure generating part. With such a configuration, the fluid in the reservoir part can be easily sucked up in the transfer pipe, so that the siphon can be efficiently started.

The fluid transfer device of the present invention can generate the siphon phenomenon without the need for a power source and has a compact configuration.

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. 1A and 1B are diagrams showing a fluid transfer device according to an embodiment of the present invention, in which FIG. 11A to 11D are cross-sectional views showing a part of an operation for starting a siphon by a fluid transfer device according to an embodiment of the present invention. 1A to 1C are cross-sectional views showing a siphon activation state of a fluid transfer device according to an embodiment of the present invention. FIG. 2 is a diagram showing an outline of negative pressure measurement in Example 1. FIG. 2 is a diagram showing an outline of the measurement of the amount of water transport in Example 1. FIG. 11 is a cross-sectional view showing a fluid transfer device according to a first modified example of the first embodiment of the present invention. FIG. 11 is a cross-sectional view showing a fluid transfer device according to a second modified example of the first embodiment of the present invention. 5A and 5B are cross-sectional views showing a fluid transfer device according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view showing a fluid transfer device according to a third embodiment of the present invention. 13A and 13B are cross-sectional views showing a fluid transfer device according to a fourth embodiment of the present invention.

The drainage device and siphon device according to the 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 the 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.

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) to 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 the 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, etc.

The downstream transfer pipe 12 is placed outdoors and constitutes a flow lower portion that is continuous with the 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 section that obstructs the flow of water in the downstream transfer pipe 12.

The pressure generating means 20 is connected to the transfer pipe 10 and generates pressure to draw 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.

The water injection section 21 is a section that stores water to be supplied to the negative pressure generating section 41, and has a cylindrical water injection tank 22 (liquid storage tank) that is open at the top. The water injection tank 22 is shaped to allow water to be easily poured from above and to allow easy installation of the first valve 23 described below. The first valve 23 is a plug member that stops the water jet 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 it may be connected via a separate pipe or the like.

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 tank 22 and can be inserted into the water tank 22. The first valve 23 is larger than the inner diameter of the lower part of the reduced diameter portion 24 and is engaged by the reduced diameter portion 24. The first valve 23 configured in this way floats on the water in the water tank 22, and when the water level drops, it abuts against the inclined part of the reduced diameter portion 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 portion 24 and the first valve 23 to be in close contact with each other and function as a valve.

The supply unit 31 has the role of supplying water to the negative pressure generating unit 41, and in combination with the water injection unit 21 constitutes a jet unit that jets the water injected into the water injection unit 21 into the negative pressure generating unit 41. 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.

The inner tube 32 has a cylindrical shape that is open at the top and bottom and extends vertically. The lower end of the inner tube 32 penetrates the bent part of the L-shaped joint 35 and protrudes downward. The upper end of the inner tube 32 is installed so that it is slightly lower than the upper end of the outer tube 33.

The outer cylinder 33 is connected upward onto the L-shaped joint 35 and covers 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 separated from the outside.

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

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

The length of the inner tube 32 and the outer tube 33, i.e., the height of the supply section 31, can 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 flows into the outer tube 33 cannot overflow the inner tube 32 even if water is injected, and the siphon will not start. Therefore, it is desirable for the height of the supply section 31 to be 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 good to set the height at which the amount of water that can be supplied to the negative pressure generating section 41 can be stably pumped.

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 that it can be connected to the diameter reducing pipe 43 arranged 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 generate a jet from the diameter reducing pipe 43. The diameter reducing unit 42 and the diameter reducing pipe 43 constitute part of the jet part that jets the fluid to the negative pressure generating unit 41.

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 an upstream transfer pipe 11 including a pumping pipe 13 to a storage section 3 covered by a foundation 2 or the like can be connected, and constitutes an inlet for allowing water to flow into the negative pressure generating section 41. The branch pipe section 44a is connected perpendicular 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.

The straight pipe section 44b is shaped so that the downstream transfer pipe 12 extending to the transfer destination 50 can be connected, and forms an outlet for discharging water to the transfer destination 50. A diameter-reducing 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-reducing pipe 43 opens into the inside of the negative pressure generating section 41 and forms a jet pipe for jetting fluid into the negative pressure generating section 41. The diameter-reducing pipe 43 is connected to the lower end of the diameter-reducing section 42 and is formed to a length that does not obstruct the inflow from the upstream transfer pipe 11. Specifically, the lower end height of the diameter-reducing 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-reducing pipe 43 does not interfere with the extension part of the branch pipe section 44a (the inlet of the negative pressure generating section 41). The lower end height of the diameter-reducing pipe 43 may be located slightly above the height of the upper edge of the branch pipe section 44a.

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.

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

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 of the fluid transfer device 1 before use. Although not shown, the upstream transfer pipe 11 on the storage section 3 side 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 transfer destination 50 side is connected to the straight pipe section 44b.

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 beginning of the water pouring process, 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 part of the reduced diameter section 24 and lower than the upper end of the inner tube 32 of the supply section 31.

As shown in FIG. 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 floats on the water at a position higher than the reduced diameter portion of the reduced diameter section 24.

As shown in FIG. 3(d), water injection into the water injection section 21 is resumed. When the water level in the water injection section 21 exceeds the height of the upper end of the inner tube 32 of the supply section 31, water starts to flow into the inner tube 32.

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, the 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, making it easier for the downstream transfer pipe 12 to become full of water. On the other hand, when water passes through the reduced diameter section 42 and the reduced diameter pipe 43 of the negative pressure generating unit 41, the flow path narrows, increasing the flow rate, and negative pressure is generated in the upstream transfer pipe 11 connected to the branch pipe section 44a of the T-shaped joint 44 due to the Venturi effect.

As shown in FIG. 4B, 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 is filled with the pumped water W, which is then discharged to the destination 50 via the downstream transfer pipe 12. Here, the water injection 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 destination 50. Note that the water injection into the water injection unit 21 may be conducted 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 destination 50 before the first valve 23 closes the reduced diameter portion 24 of the water injection unit 21.

As shown in FIG. 4(c), when the water injection to the water injection section 21 is stopped, the water level of the water injection section 21 drops below the water level of the supply section 31 due to the siphon phenomenon occurring in the supply section 31. When the water level of the water injection section 21 reaches the narrowing section of the narrowing section 24, the first valve 23 comes into close contact with the inner circumferential surface of the narrowing section 24 and closes the narrowing section 24. At this point, 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 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, maintaining the state in which the narrowing section 24 is closed.

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. In order 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, there is a risk that the negative pressure will decrease or that negative pressure will not be generated.

One method for 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 reduce the amount of water W transported from the storage section 3, and is therefore not preferable.

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).

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.

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 first valve 23 allows the transfer of water to continue without air entering the new siphon. The transfer of water continues until the water level in the storage section 3 decreases, causing air to enter the upstream transfer pipe 11.

In other words, 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, this fluid transfer device 1 does not require a power source and has a compact configuration.

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

Furthermore, in this embodiment, an L-shaped joint 15 (resistance portion) that reduces the water flow rate 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. Therefore, the pressure in the negative pressure generating portion 41 is easily reduced, making it easier to suck up the fluid from the storage portion 3. Furthermore, because air is less likely to flow into the transfer pipe 10, the siphon in the transfer pipe 10 can be stably maintained.

In addition, since the pressure generating means 20 is provided at the 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 obtained 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.

In addition, the lower end of the diameter-reducing tube 43 is positioned so as not to interfere with the branch tube section 44a (inlet) of the negative pressure generating section 41, so the diameter-reducing tube 43 does not impede the flow of water in the transfer tube 10, maximizing the amount of water transferred.

Furthermore, since the downstream transfer pipe 12 extends downward for a certain length in connection 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.

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 product names of this company will be used in the description.

Example 1
<Water injection section 21>
First, in Example 1, a straight pipe VU100 with a length of 300 mm serving as water injection tank 22 is inserted into a receiving port of VU increaser VUIN100x50 with a nominal diameter of 100 serving as diameter-reducing section 24. Next, a straight pipe VU50 with a length of 50 mm is inserted into a receiving port of VUIN100x50 with a nominal diameter of 50, and further 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.

<Supply unit 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 in parallel with the center of the socket on one side of VUL50. VP25 with a length of 290 mm is inserted into the processed hole of VUL50 that has been drilled, and fixed using adhesive or the like so that the upper end of VP25 is located near the upper end of the outer tube 33 described later, forming the inner tube 32. VU50 with a length of 190 mm is inserted into the socket of VUL50 on the VP25 penetration side to form the outer tube 33. Furthermore, DV cap DVC50 is inserted into the upper end surface of VU50, which is the outer tube 33, to form the supply part 31.

<Negative Pressure Generator 41>
Next, the socket of the TS different diameter socket TS25x16 as the reduced diameter section 45 with a nominal diameter of 16 is inserted and fixed into the socket on one side of the straight direction of the TS different diameter tee TT25x20 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 section of the TT25x20 when the TS25x16 is inserted into the socket of the TT25x20 with a nominal diameter of 16 is inserted. The TS25x16 with the VP16 inserted therein is inserted into the TT25x20 and fixed to form the negative pressure generating section 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.

<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.

<Fluid transfer device 1>
The VUL50 of the water injection unit 21 and the VUL50 of the supply unit 31 are connected using a VUL50 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 that penetrates from the VUL50 of the supply unit 31, to complete the fluid transfer device 1.

<Negative pressure measurement>
As shown in FIG. 5, a VP25 having 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 having 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 so that the TL20 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.

Next, water was poured into the water injection section 21 of the pressure generating means 20, and the negative pressure generated when 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.

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

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. After that, an additional 4 L of water is 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 made 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.

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.

Example 3
In the third embodiment, the length of the VP 16 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 TT25×20 to a length in which the height is equal to 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.

Example 4
In the fourth embodiment, the length of the reduced diameter tube 43 of the negative pressure generating unit 41 in the second embodiment is the same as that in the third embodiment. Other than that, the fourth embodiment is the same as the second embodiment.

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.

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.

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.

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.

<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, TT25x20, was directly connected to the lower end of the inner cylinder 32 of the supply unit 31. The rest was the same as Example 2.

Example 10
In the tenth embodiment, the diameter-reducing tube 43 of the negative pressure generating section 41 in the first embodiment is omitted. Other than that, the tenth embodiment is the same as the first embodiment.

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.

<Results>
In each of Examples 1 to 8, pumping was achieved in all of the five measurements of the transport 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.

Comparing Examples 1-2 and Examples 3-4, in Examples 3-4, even though the position of the lower end of the reduced diameter pipe 43 is located at the upper part so as not to obstruct the inflow of water from the lift pipe 13, there is no difference in the amount of negative pressure generated, and the inflow of water from the lift pipe 13 is not obstructed, improving the flow rate.

Comparing Examples 3-4 and 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 diameter of the pipe and further improved the flow rate.

Comparing Examples 5-6 and Examples 7-8, in Examples 7-8, the length of the outer cylinder 33 is short, i.e., the height of the supply section 31 is low, but the same effect can be obtained regardless of the height of the supply section 31.

What is common to Examples 1 to 8 is that the siphon generated by the supply unit 31 allows a stable amount of water to be supplied to the negative pressure generating unit 41 regardless of the water injection speed, and the negative pressure generating unit 41 can stably generate negative pressure, so stable pumping can be achieved regardless of the water level in the storage unit 3.

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

Comparing Examples 1-2, Example 9, and Examples 10-11, in Examples 10-11, the reduced diameter section 42 of the negative pressure generating section 41 was left but the reduced diameter 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 pointer of the negative pressure gauge 60 fluctuated less compared to Example 9, but the pointer did not stabilize as in Examples 1-2. Compared to Example 9, Examples 10-11 were able to achieve stable pumping and a certain level of effectiveness, but in order to achieve a more stable pumping and transport of water, Examples 1-2, in which the reduced diameter tube 43 is present, are more suitable.

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

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

In the fluid transfer device 1 of the first modified example, water is supplied to the negative pressure generating unit 41 at the same time as water is injected into the water injection unit 21. Water can be transferred by injecting water until the water pumped from the storage unit 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 injected 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 is omitted.

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.

Example 12
In Example 12, the lower end port of VUIN100x50 with a nominal diameter of 50 used in reduced diameter section 24 of water injection section 21 is connected to the port of TS variable diameter socket TS50x25 with a nominal diameter of 50. The port of TS50x25 with a nominal diameter of 25 is joined to negative pressure generating section 41 to form a fluid transfer device 1a without supply section 31. The other configurations and test methods are the same as those of Example 1.

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

<Example 14>
In the fourteenth embodiment, the length of the VP 16 used in the reduced diameter tube 43 of the negative pressure generating unit 41 in the twelfth embodiment is the same as that in the third embodiment.

Example 15
In the fifteenth embodiment, the length of the reduced diameter tube 43 of the negative pressure generating section 41 in the thirteenth embodiment is the same as that in the third embodiment.

<Example 16>
In Example 16, the reduced diameter portion 42 and reduced diameter pipe 43 of the negative pressure generating portion 41 of Example 13 were removed, and a T-shaped joint 44, TT25x20, was directly connected to the lower end of the water injection portion 21. The rest of the configuration was the same as Example 13.

<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.

<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.

The results for each example are shown in Table 2.

<Results>
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 operator's skill. However, if water injection operations are performed to inject the entire specified amount as in Example 13, the same effect as in Example 2 can be obtained.

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

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.

What is common to Examples 12 to 15 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 Examples 1 to 4 can be obtained. In this modified example 1, in order to appropriately supply water to the negative pressure generating section 41, for example, a ball valve or the like can be provided at the lower end of the reduced diameter section 24 of the water supply section 21 and water can be poured in with the valve closed, or a hemispherical float valve used in toilet tanks can be provided and used to pour water, so that a sufficient amount of water is stored in the water supply section 21 in advance, and the ball valve can be opened, or the float valve can be opened with a lever. When using a ball valve, water can be transferred by turning on the first valve 23 after pouring 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 using a float valve, once the float valve is opened, it closes as the water level drops, making the first valve 23 unnecessary.

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 pipe 43 in order to obtain stable water transfer.

<Modification 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.

As shown in FIG. 8, in the fluid transfer device 1b, the water injection section 21 is raised upward from its lower end 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 symbols are used and explanations are omitted.

Next, the second variant 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.

<Example 19>
In Example 19, the lower end of the VUIN100x50, which is used in the reduced diameter portion 24 of the water injection portion 21, is connected to the TS socket with a nominal diameter of 50, which is connected to the TS socket with a nominal diameter of 50. Two TL25s are connected in a U-shape to the TS50x25 socket with a nominal diameter of 25. A VP25 with a length of 290 mm is connected to the other end of the U-shape, and two TL25s are further connected in an inverted U-shape. A VP25 with a length of 340 mm is connected to the other end of the inverted U-shape, forming 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.

<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.

<Example 21>
The twenty-first embodiment is the same as the nineteenth embodiment, except that the length of the VP 16 used in the reduced diameter tube 43 of the negative pressure generating section 41 of the nineteenth embodiment is the same as that of the third embodiment.

<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.

<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, TT25x20, is directly connected to the terminal end of the S-trap structure 28.

<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.

<Example 25>
The twenty-fifth embodiment is the same as the twenty-tenth embodiment, except that the reduced diameter tube 43 of the negative pressure generating section 41 of the twenty-fifth embodiment is omitted.

The results for each example are shown in Table 3.

<Results>
In each of Examples 19 to 22, pumping was achieved in all of the five measurements of the transport amount.
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.

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

Examples 23 to 25 have similar results to Examples 9 to 11, and the presence of a reduced diameter pipe 43 is more preferable for more stable water pumping and transport.

As explained above for modified examples 1 and 2, the fluid transfer devices 1a and 1b can also transfer water in the same way as the fluid transfer device 1.

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, one option is to increase the diameter of each component that constitutes the fluid transfer device 1, the transfer pipe 10, or to add a pumping path to the fluid transfer device 1.

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

In addition, as a modified example of the second embodiment of the fluid transfer device 1d, as shown in FIG. 9(b), the lower end of the supply section 31 may be branched off at a T-shaped joint 36, and a negative pressure generating section 41 may be connected to each of the two ends.

With this configuration, water can be pumped from two systems by injecting water into the water injection section 21, so the amount of water transported can be increased.

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.

As shown in FIG. 10, the fluid transfer device 1e of the third embodiment has a valve 70 provided between the supply unit 31 and the negative pressure generating unit 41. The supply unit 31 and the valve 70 (second valve) are configured to be separable without being bonded with adhesive or the like.

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

Furthermore, 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, a new fluid transfer device can be created. As long as the installation space for the transfer pipe 10, etc. allows, additional water transfer paths can be added, and the amount of water transferred can be increased.

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.

Therefore, in the fourth embodiment, a fluid transfer device 1f has been devised that is configured to stop the transfer of water in a desired state. As shown in FIG. 11(a), this fluid transfer device 1f has 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 water transfer can be stopped by closing the valve 71 while water is being transferred from the storage section. At this time, the inside of the transfer pipe 10 is filled with water, so the siphon phenomenon is on standby, 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 prevent overflow at the transfer destination.

As another example of a modified fluid transfer device 1g of the fourth embodiment, as shown in FIG. 11(b), a ball tap 76 is provided instead of the valve provided at the lower end of the downstream transfer pipe 12 in FIG. 11(a). The ball tap 76 includes a float 77 provided in the destination storage tank 75 and a valve portion 78 that opens and closes as the float 77 rises and falls.

According to the fluid transfer device 1g configured in this way, as in each of the above embodiments, water can be transferred by injecting water into the water injection section 21, but as the water level in the storage tank 75 at the transfer destination rises, the float 77 rises and the valve of the valve section 78 closes to stop the water transfer. 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 water transfer resumes. With this 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.

Although the above describes the form of implementing the present invention, the present invention is not limited to the above embodiment, and appropriate design changes are possible within the scope of the spirit of the present invention. In the above embodiment, the transport of water stored inside the foundation of a house, i.e., water flooded 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 flooded under the floor. For example, it can be used for various purposes, such as the transport of water stored in places underground that are difficult to drain, and the temporary supply of water to temporary facilities, etc.

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.

In the above embodiment, the first valve and the second valve are each provided independently, but the two may be installed simultaneously. In this case, after water is poured and transfer from the storage section begins, 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 continued water pouring depending on the time that has passed since the water was poured, but the first valve can prevent this. In other words, it is possible to prevent unexpected siphoning. In addition, by being able to use the second valve, the functions related to the second valve described above can also be fulfilled.

REFERENCE SIGNS LIST 1 Fluid transfer device 2 Foundation 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 section)
20 Pressure generating means 21 Water injection section 22 Water injection tank 23 First valve (plug member)
24: Contracted diameter portion 31: Supply portion 32: Inner cylinder 33: Outer cylinder 34: Cap 41: Negative pressure generating portion 42: Contracted diameter portion (jet portion)
43 Reducing diameter pipe (jet section)
44 T-shaped joint 44a Branch pipe section (inlet)
44b Straight pipe part (outlet)

Claims (3)

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,
a first valve of a float type 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. The fluid transfer device according to claim 1 , wherein the resistance portion has an L-shape. 3. The fluid transfer device according to claim 1 , wherein the pressure generating means includes a jet portion for jetting fluid to the negative pressure generating portion.

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