JP3144327U - Liquid separation / water supply path changer - Google Patents

Abstract

A liquid separation / water supply path changing device capable of maintaining an excellent water supply rate (permeation rate) for a long period of time is provided.
A pipe 2 extending in a substantially vertical direction is disposed inside or outside a water tank 1, and a connection end 31 to the peripheral surface of the pipe 2 is located above an opening end 32. It is set as the structure which connected the branch piping 3 so that it may be located and the opening end 32 may be located in the inside of the water storage tank 1. FIG. And the liquid stored in the inside of the water storage tank 1 is sent to another through at least the branch pipe 3 and the pipe 2.
[Selection] Figure 1

Description

  The present invention relates to a liquid separation / water supply path changing device used for infiltrating a liquid in a water storage tank such as sewage or rainwater for domestic use into the ground or sending water to others.

Conventionally, as a liquid separation / water supply path changing device of this type, a penetrating tank has been mainly known. As the seepage trough, generally used is a treatment tank composed of a bottomed or bottomless hollow cylinder, a hollow prism or the like embedded in the ground so that its axial direction extends in the vertical direction. Are known.
The seepage trough is configured such that the treated water injected into the treatment tank is drained into the ground from a bottom surface of the treatment tank or a drain outlet provided on a side surface of the treatment tank.

However, if the treated water contains foreign matter such as dust and dust, the drainage port may be blocked by the foreign matter and the permeability may be reduced.
In patent document 1, in order to prevent obstruction | occlusion of the through-hole (drainage port) provided in the side surface of the processing tank which makes an osmosis | basket, it is proposed to comprise a drainage port with the long hole extended | stretched to a perpendicular direction. . According to the penetrating gutter described in Patent Document 1, a foreign substance that causes the drainage port to be closed falls along a long hole that forms the drainage port as the water level is lowered. Compared with the case where a drain outlet is provided, blockage of the drain outlet can be prevented.
Japanese Utility Model Publication No. 7-31988

  However, in the seepage trough described in Patent Document 1 described above, the penetration hole may be blocked due to the penetration rate of the treated water, the water level increase / decrease rate, the type of the foreign matter, and the like. There was room for further improvement in terms of completely preventing and maintaining excellent penetration for a long period of time.

  Moreover, in the osmosis | basket | basket of the above-mentioned patent document 1, when the deposit by a foreign material accumulate | stores in the bottom face of an osmosis | permeation basin, the drain outlet might be obstruct | occluded by the deposit. Here, in the seepage trough described in Patent Document 1 described above, if maintenance work is periodically performed to remove the sediment accumulated on the bottom surface, it is possible to maintain an excellent penetration rate for a long period of time. There is a new problem that the maintainability is not good.

  Then, this invention is made | formed in view of the said situation, and makes it a subject to provide the liquid separation and water supply path change apparatus which can maintain the outstanding permeability for a long period of time.

  In order to solve such problems, the present invention provides a pipe extending in a substantially vertical direction inside or outside the water tank, and a connection end with the peripheral surface is opened on the peripheral surface of the pipe. A branch pipe is connected so that the opening end is located above the end and the opening end is located inside the water tank, and the liquid stored in the water tank is at least the branch pipe and There is provided a liquid separation / water supply path changing device characterized in that water is supplied to another through the pipe.

  That is, in the liquid separation / transmission channel changing device according to the present invention, when the liquid injected into the water storage tank is stored up to the opening end of the branch pipe, the liquid moves from the opening end of the branch pipe to the pipe, It is comprised so that water may be sent to others.

  According to the liquid separation / water supply path changing device according to the present invention, a pipe is provided inside or outside the water storage tank, and the branch pipe connected to the peripheral surface of the pipe is connected to the peripheral surface from the opening end. Since the floating end (foreign matter) contained in the liquid is less likely to enter the pipe through the branch pipe by providing the upper end and the opening end located inside the water storage tank, It is possible to prevent clogging of the piping that becomes the liquid water supply port due to foreign matter. Therefore, regardless of the liquid permeation rate, the water level increase / decrease rate, the type of foreign matter, etc., it is possible to efficiently prevent the clogging of the discharge port by the foreign matter, so that an excellent water supply rate can be maintained for a long period of time. When draining and penetrating a liquid into the ground, it is possible to maintain an excellent permeability for a long period of time.

Here, in the liquid separation / water supply path changing device according to the present invention, two or more branch pipes may be provided in the height direction of the pipe.
According to this configuration, even when foreign matter deposits accumulate on the bottom surface of the water storage tank and the branch pipe located below is blocked, the branch pipe located above the water tank is used to Water can be sent to the piping. For this reason, it is possible to maintain an excellent penetration rate for a long period of time without frequently performing maintenance work for removing the sediment accumulated on the bottom surface as in the case of the seepage trough described in Patent Document 1 described above. it can.

Moreover, in the liquid separation / water supply path changing device according to the present invention, a structure may be adopted in which a water supply pipe capable of supplying the liquid to the other side is connected to a side surface of the pipe.
According to this configuration, since the liquid moved into the pipe can be sprinkled not only from the opening end of the pipe but also from the peripheral surface of the pipe, the water supply rate can be further improved.

Furthermore, in the liquid separation / water supply path changing device according to the present invention, a foreign matter entry preventing member may be provided in the vicinity of the opening end of the branch pipe.
According to this configuration, since the foreign matter intrusion preventing member can more effectively prevent foreign matter from entering the branch pipe, it is possible to more efficiently prevent the pipe serving as the liquid water supply port from being blocked by the foreign matter.

  According to the liquid separation / water supply path changing device according to the present invention, even when foreign matter is contained in the liquid, it is possible to prevent clogging due to foreign matter in the pipe serving as the liquid supply port, which is excellent. It becomes possible to maintain the water supply rate for a long time.

  Hereinafter, an embodiment of a liquid separation / water supply channel changing device according to the present invention will be described with reference to the drawings.

<First embodiment>
1A and 1B show an example of a liquid separation / water supply channel changing device according to the present invention, in which FIG. 1A is a perspective view and FIG. 1B is a cross-sectional view taken along line AA in FIG. FIG. 2 is a cross-sectional view showing an example of use of the liquid separation / water supply path changing device according to the present invention.

  As shown in FIG. 1, this liquid separation / water supply path changing device 10A is installed in a bottomed concrete water tank 1 having opening holes 11 and 12 on its bottom and side surfaces. It is disposed in the center of the inside of the tank 1 in a state of extending in a substantially vertical direction, and is made of an iron pipe 2 made of a bottomless hollow cylinder having a smaller diameter than the water storage tank 1.

Here, the pipe 2 has one end in the length direction (opening end serving as a water supply port) 21 passing through the opening hole 11 provided in the bottom surface of the water storage tank 1, and vertically below the bottom surface of the water storage tank 1. The other end 22 in the length direction is arranged upright with the other end 22 disposed vertically below the opening surface of the water tank 1.
At this time, as shown in FIG. 1, filter stones 7 such as broken chestnut stone and gravel are laid on the outer peripheral edge of the open end 21 in order to remove foreign substances in the liquid.

A plurality of (two in this embodiment) branch pipes 3 are inclined on the circumferential surface of the pipe 2 at a predetermined angle (for example, about 30 °) toward the bottom surface of the water storage tank 1 in the height direction. Are connected at a predetermined interval.
The branch pipes 3 have the same dimensions, and are made of an iron hollow cylinder having a diameter substantially the same as or smaller than that of the pipe 2.
The branch pipe 3 is connected at its one end (connecting end) 31 in the length direction to the opening hole 23 provided at a predetermined interval in the height direction of the pipe 2 by welding or the like. An end (open end) 32 is disposed inside the water tank 1. That is, in this branch pipe 3, the connection end 31 with the peripheral surface of the pipe 2 is disposed above the opening end 32.

Further, on the peripheral surface of the pipe 2, a water supply pipe 4 extending in the diameter direction of the pipe 2 is connected to each of the middle position between the upper and lower branch pipes 3 and below the lowermost branch pipe 3. .
Here, the water pipe 4 is connected at its one end in the length direction (connecting end) 41 to the opening hole 24 provided at a predetermined interval in the height direction on the peripheral surface of the pipe 2 by welding or the like. The other end (opening end) 42 in the length direction is disposed in a state of penetrating through the opening hole 12 provided on the side surface of the water storage tank 1 and protruding to the outside of the water storage tank 1.

  Further, in the water storage tank 1, a circular wire mesh member (foreign material intrusion prevention member) 5 that covers the open end 32 is provided in the vicinity of the open end 32 of the branch pipe 3.

The liquid separation / water supply channel changing device 10A is installed in a hole formed by excavating the water storage tank 1 in the ground, and cracked rocks and gravel (not shown) are formed on the outer peripheral surface of the water storage tank 1. ) Is used by being buried in the ground.
Further, in the vicinity of the outer peripheral surface of the pipe 2 and the water pipe 4 projecting outward from the water storage tank 1, quarry stone and gravel (not shown) are arranged in order to improve the water feeding rate (penetration rate) of the liquid. Used in the installed state.

  Next, a liquid water supply method in the liquid separation / water supply path changing device 10A according to the present embodiment will be described below.

  First, the liquid injected into the water tank 1 is stored inside the water tank 1 as shown in FIG. And if the water level of the liquid stored in the inside of the water tank 1 becomes higher than the opening end 32 of the branch pipe 3 located in the lowest part, as shown in FIG.2 (b), opening of the lowest branch pipe 3 will be shown. It passes through the end 32 and moves to the pipe 2, and the water is sent from the opening end 21 serving as the water supply port of the pipe 2 to the other (for example, into the ground).

  Here, in the water storage tank 1, relatively light foreign substances contained in the liquid float on the liquid water surface as floating dust, and are branched by the wire mesh member 5 and the inclination provided in the branch pipe 3. Intrusion into the pipe 3 is prevented. On the other hand, among the foreign matters contained in the liquid, relatively heavy ones are accumulated as sediment on the bottom surface of the water storage tank 1 until the liquid is stored up to the opening end 32 of the branch pipe 3. As a result, the liquid from which foreign matter has been removed in the water storage tank 1 is fed from the open end 21 serving as the water feed port of the pipe 2 to the other (for example, into the ground).

  When the amount of liquid injected from the branch pipe 3 into the pipe 2 is larger than the water supply rate from the opening end 21 forming the bottom surface of the pipe 2 to the other (permeation rate into the ground), the pipe 2 Liquid is stored in the interior. When the water level of the liquid stored in the pipe 2 becomes higher than the connection end 41 of the water pipe 4 provided at the lowermost part of the pipe 2, the liquid is supplied to the pipe 2 as shown in FIG. From the open end 42 of the water pipe 4 to the other (for example, into the ground).

  That is, according to the liquid separation / water supply path changing device 10 </ b> A according to the present embodiment, the pipe 2 is disposed inside the water tank 1, and the peripheral surface of the pipe 2 is inclined toward the bottom surface of the water tank 1. By providing the branch pipe 3, it is possible to prevent foreign matter from entering the pipe 2 from the branch pipe 3. Therefore, since obstruction | occlusion of the foreign material to the piping 2 used as the water supply port of 10 A of liquid separation / water supply path change apparatuses can be prevented, the outstanding water supply rate (permeation rate) can be maintained for a long time.

  Further, according to the liquid separation / water supply path changing device 10A according to the present embodiment, by providing the metal net member 5 for removing dust at the opening end 32 of the branch pipe 3, foreign matter from the branch pipe 3 to the pipe 2 can be removed. Intrusion can be effectively prevented.

  Furthermore, according to the liquid separation / water supply path changing device 10A according to the present embodiment, the liquid from which foreign matters are removed by passing through the branch pipe 3 can be supplied to the other through the pipe 2 (for example, into the ground). In this way, even if foreign matter enters the pipe 2, the foreign matter is finally removed by the filter stone 7 laid on the outer peripheral edge of the opening end 21. The degree can be improved. Therefore, even when sewage such as domestic water is infiltrated into the ground, water can be supplied with peace of mind through the liquid separation / water supply path changing device 10A according to the present embodiment.

Furthermore, according to the liquid separation / water supply path changing device 10A according to the present embodiment, a plurality of branch pipes 3 are provided at substantially the same gradient at predetermined intervals in the height direction of the pipes 2, thereby Even when foreign matter deposits are accumulated on the bottom of the tank 1 and the open end 32 of the branch pipe 3 located at the bottom is closed, the branch pipe 3 located at the central part immediately above is used. Thus, water can be continuously supplied to the pipe 2.
Therefore, as in the case of the seepage trough described in Patent Document 1 described above, an excellent water supply rate (permeation rate) can be obtained without frequently performing maintenance work for removing the sediment accumulated on the bottom surface of the water tank 1. Can be maintained for a long time.

  Furthermore, according to the liquid separation / water supply path changing device 10A according to the present embodiment, the water supply pipe 4 to be connected to the pipe 2 is provided at an intermediate position between the upper and lower branch pipes 3 and below the lowermost branch pipe 3. Thus, the liquid stored in the pipe 2 can be fed to the other through the water pipe 4 without returning to the water storage tank 1 through the branch pipe 3.

  Furthermore, according to the liquid separation / water supply path changing device 10A according to the present embodiment, the pipe 2 is connected to the peripheral surface of the pipe 2 by connecting the water supply pipe 4 with the open end 42 positioned outside the water storage tank 1. Compared with the case where water is supplied from only the opening end 21 serving as the water supply port 2 to the other, the amount of water supplied to the other increases, and when penetrating into the ground, water is supplied from a portion closer to the ground surface. Therefore, the water pressure and hydraulic power are increased, and the permeability can be further improved.

In the liquid separation / water channel changing device 10A according to the present embodiment, the case where the water storage tank 1 is bottomed has been described. However, the water storage tank 1 is bottomless, and the bottom surface of the water storage tank 1 and the pipe 2 are fed. It is good also as a structure which can send water from the opening end 21 used as a water inlet, and the opening end 42 of the water pipe 4 to others.
Further, the water tank 1 is made bottomless, a partition plate having substantially the same size as the outer diameter of the water tank 1 is provided at a predetermined position in the height direction of the water tank 1, and a bottom surface is formed at a predetermined position in the height direction of the water tank 1. It is good also as the structure which carried out.

  Here, in the case where the water tank 1 is bottomed, in order to reduce the frequency of maintenance work for removing the sediment accumulated on the bottom surface of the water tank 1, the vertical direction from the bottom surface of the water tank 1 to the opening surface is used. It is preferable to make the direction length as long as possible.

  Further, in the liquid separation / water supply path changing device 10A according to the present embodiment, the configuration of the pipe 2 and the branch pipe 3 and the water pipe 4 to be connected to the pipe 2 are not limited thereto, and the number of pipes installed, the pipe diameter, and the pipe shape The material and the like can be changed as appropriate.

For example, the branch pipe 3 and the water supply pipe 4 may be configured to have a predetermined angle in the middle of the length direction.
Moreover, you may comprise so that it may have the water supply port which consists of a some hole in the surrounding surface of the opening end 21 used as the water supply port of the piping 2, or the opening end 42 of the water supply pipe 4. FIG.
Further, the opening end 42 of the water pipe 4 may be configured to be positioned vertically below the bottom surface of the water storage tank 1.
Further, the other end 22 in the length direction of the pipe 2 may be configured so that the other end 22 in the length direction faces downward by being bent in a U shape as illustrated.

<Second embodiment>
FIGS. 3A and 3B show an example of a liquid separation / water supply path changing device according to the present invention, in which FIG. 3A is a perspective view and FIG. 3B is a cross-sectional view taken along line BB in FIG. FIG. 4 is a cross-sectional view showing an example of use of the liquid separation / water supply path changing device according to the present invention.

  As shown in FIG. 3, the liquid separation / water supply path changing device 10 </ b> B is installed in a bottomed concrete water tank 1 having an opening 12 on a side surface. It is arranged in a state of being extended in a substantially vertical direction, and is made of an iron pipe 2 made of a hollow cylinder having a smaller diameter than the water storage tank 1 and having a substantially L shape in side view.

Here, the pipe 2 has one end in the length direction (open end serving as a water supply port) 21 disposed below the bottom surface of the water storage tank 1 on the side surface of the water storage tank 1, and the other end 22 in the length direction thereof. In the state arrange | positioned vertically lower than the opening surface of the water storage tank 1, it is arrange | positioned upright.
At this time, as shown in FIG. 3, filtration stones 7 such as cracked chestnut and gravel are laid on the outer peripheral edge of the open end 21 in order to remove foreign substances in the liquid.

  In addition, a plurality of (two in this embodiment) branch pipes 3 inclined at a predetermined angle (for example, about 30 °) toward the bottom surface of the water storage tank 1 are provided on the peripheral surface of the pipe 2 in the height direction. They are connected with a predetermined interval.

The branch pipes 3 have the same dimensions, and are made of an iron hollow cylinder having a diameter substantially the same as or smaller than that of the pipe 2.
The branch pipe 3 is connected at its one end (connecting end) 31 in the length direction to the opening hole 23 provided at a predetermined interval in the height direction of the pipe 2 by welding or the like. An end (opening end) 32 is provided in the side surface of the water storage tank 1 so as to pass through the opening hole 12 provided at a predetermined interval in the height direction and to be positioned in the water storage tank 1.
Further, on the peripheral surface of the pipe 2, a water supply pipe 4 extending in the diameter direction of the pipe 2 is connected to each of the middle position between the upper and lower branch pipes 3 and below the lowermost branch pipe 3. .

  Here, the water pipe 4 has one end in the length direction (connecting end) 41 connected to the opening hole 24 provided at a predetermined interval in the height direction on the peripheral surface of the pipe 2 by welding or the like. .

  Further, in the water storage tank 1, a circular wire mesh member (foreign material intrusion prevention member) 5 that covers the open end 32 is provided in the vicinity of the open end 32 of the branch pipe 3.

  In addition, the water tank 1, the pipe 2, the branch pipe 3, and the water pipe 4 constituting the liquid separation / water supply path changing device 10B are all installed in a hole provided by excavation processing in the ground. 1, the pipe 2, the branch pipe 3, and the water pipe 4 are used in a state where they are buried in the ground by backfilling cracked crushed stones and gravel (not shown) respectively.

  Next, a liquid water supply method in the liquid separation / water supply path changing device 10B according to the present embodiment will be described below.

  First, the liquid injected into the water storage tank 1 is stored in the water storage tank 1 as shown in FIG. When the water level of the liquid stored in the water tank 1 becomes higher than the opening end 32 of the branch pipe 3 located at the lowermost part, the opening of the lowermost branch pipe 3 as shown in FIG. It passes through the end 32 and moves to the pipe 2, and water is sent from the open end 21 of the pipe 2 to the other (for example, underground).

  Here, in this water storage tank 1, as in the first embodiment described above, among the foreign substances contained in the liquid, relatively light ones branch due to the inclination provided in the wire mesh member 5 and the branch pipe 3. The relatively heavy material that is prevented from entering the pipe 3 is accumulated as sediment on the bottom surface of the water tank 1 until the liquid is stored up to the open end 32 of the branch pipe 3. As a result, the liquid from which foreign matter has been removed in the water storage tank 1 is fed from the open end 21 serving as the water feed port of the pipe 2 to the other (for example, into the ground).

  When the amount of liquid injected from the branch pipe 3 into the pipe 2 is larger than the water supply rate from the opening end 21 forming the bottom surface of the pipe 2 to the other (permeation rate into the ground), the pipe 2 Liquid is stored in the interior. When the water level of the liquid stored in the pipe 2 becomes higher than the connection end 41 of the water pipe 4 provided at the lowermost part of the pipe 2, the liquid is supplied to the pipe 2 as shown in FIG. From the open end 42 of the water pipe 4 to the other (for example, into the ground).

  That is, according to the liquid separation / water supply path changing device 10 </ b> B according to the present embodiment, the pipe 2 is disposed outside the water tank 1, and the peripheral surface of the pipe 2 is inclined toward the bottom surface of the water tank 1. By providing the branch pipe 3, the same effects as those of the first embodiment described above can be obtained.

  Further, according to the liquid separation / water supply path changing device 10B according to the present embodiment, the liquid stored in the water storage tank 1 is passed through the branch pipe 3, and the liquid from which foreign matters are removed is passed through the pipe 2. In the unlikely event that foreign matter enters the pipe 2, the foreign matter is finally removed by the filter stone 7 laid on the outer peripheral edge of the opening end 21. With this configuration, it is possible to provide the liquid separation / water supply path changing device 10B that can maintain an excellent water supply rate (permeability) for a long period of time.

  In addition, in the liquid separation / water supply path changing device 10B according to the present embodiment, the water supply pipe 4 is provided on the peripheral surface of the pipe 2 and water is supplied from the opening ends of the pipe 2 and the water supply pipe 4, but the present invention is not limited thereto. Alternatively, the water supply pipe 4 may not be provided on the peripheral surface of the pipe 2, and all the liquid injected into the pipe 2 may be supplied from the opening end 21 that serves as the water supply port of the pipe 2.

  Moreover, in the liquid separation / water supply path changing device 10 </ b> B according to the present embodiment, the opening end 32 of the branch pipe 3 passes through the opening hole 12 provided in the side surface of the water storage tank 1 and is located in the water storage tank 1. However, the present invention is not limited to this, and the opening end 32 may be provided so as to be substantially flush with the side surface of the water tank 1 and connected by welding or the like.

Moreover, in the liquid separation / water supply path changing device 10B according to the present embodiment, the configuration of the pipe 2, the branch pipe 3, and the water supply pipe 4 is not limited thereto, and the number of pipes installed, the pipe diameter, the pipe shape, the material, and the like are appropriately selected. It can be changed.
For example, a plurality of pipes 2 may be provided outside the water storage tank 1.

For example, the branch pipe 3 and the water supply pipe 4 may be configured to have a predetermined angle in the middle of the length direction.
Moreover, you may comprise so that it may have the water supply port which consists of a some hole in the surrounding surface of the opening end 21 used as the water supply port of the piping 2, or the opening end 42 of the water supply pipe 4. FIG.
Further, the opening end 42 of the water pipe 4 may be configured to be positioned vertically below the bottom surface of the water storage tank 1.
Further, the other end 22 in the length direction of the pipe 2 may be configured so that the other end 22 in the length direction faces downward by being bent in a U shape as illustrated.

Further, the pipe 2 is formed of a hollow cylinder having a substantially T-shape when viewed from the side, and the pipe 2 forming the vertical line of the T-shape is arranged so as to extend to the outside of the water tank 1 in a substantially vertical direction. In addition, a configuration in which the portion forming the T-shaped horizontal line is the two open ends 21 in the pipe 2 can be considered.
With this configuration, since the opening end 21 serving as the water supply port of the pipe 2 is provided in two directions outside the water storage tank 1, the amount of water supplied to the other increases, and the water supply rate (permeation rate) is further improved. Can do.

  Furthermore, in the liquid separation / water supply path changing devices 10A and 10B according to the present embodiment, the case where the wire net member 5 is used as the foreign matter intrusion prevention member has been described. For example, a floating member is fixed to a flat plate member so that the foreign matter intrusion prevention member can be moved up and down in accordance with the liquid level, and the foreign matter intrusion prevention member can be moved up and down by a support rod. Good.

  The liquid separation / transmission channel changing device according to the present invention can be suitably used for draining and infiltrating sewage and rainwater such as domestic water as liquid into a ground using a sewer pipe or a reservoir as a water storage tank. .

An example of the penetration penetrating machine concerning the present invention is shown, (a) is a perspective view and (b) is an AA sectional view of Drawing 1 (a). It is sectional drawing which shows one example of use of the osmosis | permeation basket shown in FIG. The other example of the osmosis | permeation basket | hook concerning this invention is shown, (a) is a perspective view, (b) is BB sectional drawing of Fig.3 (a). FIG. 4 is a cross-sectional view showing an example of use of the seepage ridge shown in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water storage tank 2 Piping 3 Branch piping 4 Water supply pipe 31 Connection end 32 Open end 41 Connection end 42 Open end
5 Wire mesh member (foreign material intrusion prevention member)
10A, 10B Liquid separation / water channel change device

Claims (4)

A pipe that is installed inside or outside the water tank and that extends in a substantially vertical direction is disposed, and a connection end with the peripheral surface is positioned above the opening end on the peripheral surface of the pipe. And it is set as the structure which connected branch piping so that the above-mentioned opening end may be located in the inside of the above-mentioned water storage tank,
A liquid separation / water supply path changing device characterized in that the liquid stored in the inside of the water storage tank is supplied to other water through at least the branch pipe and the pipe.   The liquid separation / water supply path changing device according to claim 1, wherein two or more branch pipes are provided in a height direction of the pipe.   3. The liquid separation / water supply path changing device according to claim 1, wherein a water supply pipe capable of supplying the liquid to the pipe is connected to a peripheral surface of the pipe.   The liquid separation / water supply path changing device according to claim 1, wherein a foreign matter intrusion prevention member is provided in the vicinity of the opening end of the branch pipe.

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