JP5827184B2 - Trap siphon drainage device - Google Patents

Description

  The present invention relates to a trap siphon drainage device that discharges water stored in a water storage tank using a siphon tube and a trap tube.

  Conventionally, one end of an inverted U-shaped siphon tube is arranged as a suction port in the water tank, and the siphon action of this siphon tube sucks up the water in the water tank from the suction port and sucks the sucked water into the siphon tube. A drainage device that discharges from a drainage port at the other end to a drainage channel or the like is known (see, for example, Patent Document 1).

  In this type of drainage device, in order to start drainage by siphon action (hereinafter referred to as siphon drainage), it is necessary to fill the space in the siphon pipe. As a method for this, it is conceivable that the water storage tank is configured to store water up to a height higher than the top of the siphon tube. In that configuration, when the water level in the water tank rises, the water level in the siphon tube also rises to almost the same height. Therefore, when the water level in the water tank rises to a level above the top of the siphon tube, the water level in the siphon tube reaches the maximum water level, the space in the siphon tube becomes full, and siphon drainage starts automatically. Is done.

  However, in the above configuration, it is difficult to start siphon drainage when the water level in the water storage tank is lower than the top of the siphon tube. Even in such a case, in order to be able to start siphon drainage, air in the siphon tube is sucked out by an air suction device such as a vacuum pump from the suction hole provided at the top of the siphon tube, thereby raising the water level in the siphon tube. It is necessary to fill the space in the siphon tube with water. However, such a method requires an air suction device and increases the manufacturing cost.

JP-A-5-2331397

  The present invention has been made to solve the above-described conventional problems, and even if the water level in the water storage tank is lower than the top of the siphon tube, siphon drainage can be automatically started, and the production cost can be reduced. It aims at providing the trap siphon drainage device which can be reduced.

  In order to achieve the above object, a trap siphon drainage device of the present invention comprises a siphon pipe formed by bending the upper part of a water absorption vertical pipe whose lower end is opened in a water tank into an inverted U shape and drooping the water tank. A trap siphon drainage device for discharging the water stored in the siphon tube by a siphon action of the siphon tube, wherein one end is connected to the hanging portion of the siphon tube and drains from the other end, and the siphon of the trap tube A self-priming pipe that branches off and hangs down from a connecting portion with the pipe and has an open lower end, the trap pipe is sealed with water, and the siphon pipe is opened to the atmosphere through the self-priming pipe, When the water level in the water storage tank becomes higher than the height of the top of the siphon tube, water in the siphon tube flows into the trap tube and the self-priming tube, At least a part of the self-priming pipe is sealed with the water that has flowed in, and by dropping the sealed water in the pipe, the air in the siphon pipe is sucked out, and a negative pressure is generated in the siphon pipe. The water flow rate in the siphon tube is increased to seal at least a part of the drooping portion of the siphon tube, and the siphon tube traps the air in the siphon tube by the fall of the sealed water in the drooping portion. It discharges from a pipe | tube, the space in the said siphon pipe | tube is filled with water, a siphon action is produced, and it drains from the said trap pipe | tube.

  The siphon pipe has a pipe separation pipe provided along a pipe inner wall on the water storage tank side in the hanging portion, and the water exceeding the pipe top of the siphon pipe is caused to flow by the water flow. It is preferable that when it hits the inner wall of the pipe opposite to the water storage tank side, the water is splashed up and flows into the outer part of the pipe separation pipe in the hanging part.

  One end of the siphon tube is connected to the top, the other end is opened, and the pressure control tube is bent in an inverted U shape. The open end of the pressure control tube is a preset lower limit of the water level of the water storage tank. It is preferably positioned so as to be the same height as the value.

  According to the present invention, even if the water level in the water storage tank is lower than the top of the siphon tube, the trap tube connected to the siphon tube is sealed, and the siphon tube is opened to the atmosphere via the self-priming tube. When the water level in the water storage tank becomes higher than the top of the siphon tube, the water flows into the trap tube, the flowing water flows into the self-suction tube, and the self-suction tube is sealed. Is sucked out, the water flow rate increases, and the inside of the drooping portion of the siphon tube is sealed with water. And by the fall of the sealing water, air is further sucked out and a siphon action occurs. As a result, siphon drainage can be started automatically. Moreover, in order to start siphon drainage, it is not necessary to suck out the air A1 from the siphon tube 3 using a vacuum pump or the like. Therefore, a vacuum pump or the like is not necessary, and the manufacturing cost can be reduced.

Sectional drawing which shows the structure of the trap siphon drainage apparatus which concerns on one Embodiment of this invention. (A) (b) is sectional drawing which shows a state when the water level in the siphon pipe | tube in the said trap siphon drainage apparatus rises gradually in time series order. (A) (b) is sectional drawing which shows a state when the water level in the siphon pipe | tube in the said trap siphon drainage apparatus rises gradually in time series order. (A) is sectional drawing which shows the state at the time of siphon drainage of the said trap siphon drainage apparatus, (b) is sectional drawing which shows the state at the time of the drain stop of the trap siphon drainage apparatus. (A) is sectional drawing which shows the structure of the trap siphon drainage apparatus which concerns on a 1st modification, (b) is sectional drawing of the pipe line separation pipe part of the trap siphon drainage apparatus. Sectional drawing which shows a state when the water in a siphon pipe | tube hits a pipe line separation pipe | tube during the waste_water | drain in the said trap siphon drainage apparatus. Sectional drawing which shows the structure of the trap siphon drainage apparatus which concerns on a 2nd modification. Sectional drawing which shows the structure of the trap siphon drainage apparatus which concerns on a 3rd modification. Sectional drawing which shows a state when an adjustment valve opens during siphon drainage in the said trap siphon drainage apparatus. Sectional drawing which shows the structure of the trap siphon drainage apparatus which concerns on a 4th modification. Sectional drawing which shows the state at the time of the drainage start of the said trap siphon drainage device. Sectional drawing which shows the structure of the trap siphon drainage apparatus which concerns on a 5th modification. (A) is sectional drawing which shows the state at the time of siphon drainage of the said trap siphon drainage apparatus, (b) is sectional drawing which shows the state at the time of the drain stop of the trap siphon drainage apparatus.

  A trap siphon drainage apparatus (hereinafter referred to as a drainage apparatus) according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the drainage device of this embodiment. The drainage device 1 includes a siphon pipe 3 and a trap pipe 4 that are connected in order from the water storage tank 2 side, and further includes a self-priming pipe 5 that branches off from the trap pipe 4, and siphon pipes the water stored in the water storage tank 2. 3 is discharged by siphon action.

  The siphon pipe 3 is formed by bending an upper part of a cylindrical water absorption pipe having a lower end 3a opened in the water storage tank 2 so as to extend substantially horizontally, and further bending and drooping the tip part thereof. Hereinafter, the lower part arranged in the water storage tank 2 of the water absorption vertical pipe is referred to as a suction part 31, and a substantially horizontally extending part of the water absorption vertical pipe is referred to as a horizontal pulling part 32, and the water absorption vertical pipe is suspended. The end portion is referred to as a hanging portion 33. The horizontal pulling portion 32 is substantially orthogonal to the drooping portion 33, and the sucking portion 31, the horizontal pulling portion 32, and the drooping portion 33 are designed to have the same tube diameter.

  The trap tube 4 is formed of a U-shaped and cylindrical flowing water tube, and one end 4a is connected to the hanging portion 33 and the other end 4b is opened. The other end 4b is disposed at a position lower than the inner bottom portion of the horizontal pulling portion 32, that is, the tube top portion 3b of the siphon tube 3, and the trap tube 4 drains from the other end 4b. The drain port 41 on the other end 4b side of the trap tube 4 is formed sideways. The drain port 41 may be directed obliquely downward in order to prevent scattering of drainage. When the trap tube 4 has a top in the pipe on the other end 4b side that is higher than the inflow port 51 formed at the branch portion of the self-priming pipe 5 from the trap pipe 4, when water flows into the trap pipe 4 and its water level rises, The water is configured to flow into the self-priming pipe 5 before being drained from the other end 4b. Hereinafter, the portion connected to the siphon tube 3 in the trap tube 4 is referred to as a connecting portion 42.

  The self-priming pipe 5 is constituted by a cylindrical flowing water pipe, branches from the connecting portion 42 of the trap pipe 4 with the siphon pipe 3 and hangs down, and further, its lower end is bent in an L shape, The lower end 5a is disposed at a position lower than the lower end 3a of the siphon tube 3, and is open. The tube diameter of the self-priming tube 5 is designed to be smaller than the tube diameter of the trap tube 4. The material of the siphon tube 3, the trap tube 4, and the self-priming tube 5 is not particularly limited, and is, for example, a resin such as vinyl chloride or FRP (Fiber Reinforced Plastics), metal, concrete, or the like.

  Next, drainage treatment of the drainage device 1 will be described. The state at the time of drainage is shown in FIGS. Prior to the start of drainage, the water level in the water storage tank 2 is at a level higher than the lower end 3 a of the siphon pipe 3, the trap pipe 4 is sealed, and the water level in the trap pipe 4 is substantially the same as the lower end of the inlet 51. It is assumed that the siphon tube 3 is opened to the atmosphere through the self-priming tube 5. Here, the water level in the water storage tank 2 is referred to as L1, and the height of the pipe top 3b of the siphon tube 3, that is, the water level at which water begins to flow into the trap tube 4 in the siphon tube 3 is referred to as the overflow line L2. The water level based on the overflow line L2 in the drawing portion 32 is referred to as a pipe water level D1. Hereinafter, the in-pipe water level D1 is expressed as a percentage where the water level when the in-pipe is full is 100.

  In FIG. 2 (a), the water level L1 in the water storage tank 2 exceeds the overflow line L2, but is lower than the top 3c of the siphon tube 3, and the in-pipe water level D1 of the horizontal pulling portion 32 is 0 [%] <D1. <10 [%] is shown. In this state, the water W overflowing from the suction part 31 and flowing in the horizontal pulling part 32 (hereinafter abbreviated as “symbol”) passes through the pipe inner wall 33a of the drooping part 33 on the water storage tank 2 side, and is trapped. 4 flows into. The flow of water flowing into the trap tube 4 through the horizontal pulling portion 32 is called overflow. The overflowed water accumulates in the trap pipe 4, the water level in the trap pipe 4 rises, and the water flows into the self-priming pipe 5 from the inlet 51 of the self-priming pipe 5. Due to the overflow, bubbles A2 including air A1 in the siphon tube 3 may be generated in the water in the trap tube 4. When the water in the trap tube 4 accumulates to such an extent that the inlet 51 is blocked, a part of the self-priming tube 5 is sealed with water. The self-priming pipe 5 sucks out the air A1 in the siphon pipe 3 due to the fall of the sealed water in the pipe, and generates a negative pressure in the siphon pipe 3. Due to the negative pressure, the pipe water level D1 rises and becomes slightly higher than the water level L1 in the water tank 2.

  FIG. 2B shows a state in which the in-pipe water level D1 of the horizontal pulling portion 32 satisfies 10 [%] ≦ D1 <30 [%]. In this state, as the pipe water level D1 rises, the overflow rate increases, and a part of the bubbles A2 enters the self-priming pipe 5 by the flow of water flowing into the self-priming pipe 5, and is discharged from the lower end 5a. When the water level in the trap pipe 4 is higher than the inlet 51, the self-priming pipe 5 is sealed. However, when the water level in the trap pipe 4 slightly exceeds the inlet 51, the height of the water surface is increased. Since the distance to the inflow port 51 is short, not only water but also the air A1 in the siphon tube 3 is drawn into the self-priming tube 5 by the suction force caused by the sealing water falling in the self-priming tube 5. For this reason, the water flow in the self-priming tube 5 is weakened by the buoyancy of the air A1, so the water flow in the self-priming tube 5 is not so fast. However, the higher the water level in the trap pipe 4 is at a height higher than the inlet 51, the longer the distance between the water level in the trap pipe 4 and the inlet 51, and the air A1 is sucked into the self-priming pipe 5. It becomes difficult and eventually becomes full (a state where the entire self-priming pipe 4 is sealed with water). Along with this, the water flow in the self-priming pipe 5 becomes faster, the suction force by the self-priming pipe 5 becomes stronger, the negative pressure in the siphon pipe 3 rises, and the water level D1 in the pipe further rises due to the negative pressure.

  FIG. 3A shows a state where the in-pipe water level D1 of the horizontal pulling portion 32 is 30 [%] ≦ D1 <50 [%]. In this state, the momentum of the overflowing water increases, and the water leaves the inner wall 33a and falls into the trap pipe 4. As a result, many bubbles A2 are generated in the trap tube 4. A part of the bubble A2 flows toward the other end 4b of the trap tube 4 by the water flow in the trap tube 4, bursts at the water surface of the other end 4b, and is discharged to the outside. Therefore, coupled with the generation of the negative pressure in the siphon tube 3 due to the action of the self-priming tube 5 described above, the negative pressure in the siphon tube 3 further increases, and as a result, the in-pipe water level D1 further increases.

  FIG. 3B shows a state in which the in-pipe water level D1 of the horizontal pulling portion 32 satisfies 50 [%] ≦ D1 <100 [%]. In this state, due to the negative pressure in the siphon tube 3 due to the action of the self-priming tube 5 described above, the momentum of the water flow in the horizontal pulling portion 32 is further increased, and the water leaves the tube inner wall 33a and jumps out in a substantially horizontal direction. 2 reaches the inner wall of the pipe on the opposite side. The horizontal pulling portion 32 and the hanging portion 33 have an annular cross section and the same tube diameter. Therefore, when the in-pipe water level D1 of the horizontal pulling portion 32 is 50% or more and the width of the water flow is equal to the pipe diameter in the horizontal pulling portion 32, the width of the water flow is also equal to the pipe diameter in the hanging portion 33. The water reaches the inner wall of the pipe in the width direction, and the water sealing condition is satisfied. In this way, the self-priming pipe 5 seals a part of the hanging part 33, specifically, the pipe space of the upper end part 33b, by increasing the overflow rate due to the negative pressure. Z1 is formed, and the upper space and the lower space of the water-seal zone Z1 are separated. The siphon tube 3 pulls the air A1 in the upper space due to the fall of the sealed water in the upper end portion 33b, and thereby draws water further from the suction portion 31 to the horizontal pulling portion 32, further increasing the in-pipe water level D1 and the flow velocity. Let Moreover, the siphon tube 3 takes in the pulled air A1 as water bubbles A2 into the water in the trap tube 4 due to the fall of the sealing water, and discharges the air bubbles A2 (air A1) and water taken in from the trap tube 4. The water in the trap pipe 4 temporarily stays due to the buoyancy of the bubble A2 on the one end 4a side, but when the water level on the one end 4a side rises and becomes higher than the water level on the other end 4b side, the air A1 by the self-priming pipe 5 In combination with the drawing of water, the flow velocity in the trap tube 4 is increased, the force to carry out the air A1 is increased, and the siphon tube 3 suddenly approaches the full state.

  FIG. 4A shows a state where the in-pipe water level D1 of the horizontal pulling portion 32 is 100 [%]. In this state, the space in the siphon tube 3 is filled with water, and the siphon tube 3 causes siphon action and drains from the trap tube 4. Hereinafter, drainage due to siphon action is simply referred to as siphon drainage.

  FIG.4 (b) shows the state which drainage stopped. The siphon drainage continues until the water level L1 in the water storage tank 2 becomes lower than the lower end 3a of the siphon tube 3, but when the water level L1 becomes lower than the lower end 3a, the lower end 3a is opened to the atmosphere, and the siphon tube 3 Air gets into the. For this reason, the conditions for causing siphon action are not satisfied, and as a result, drainage stops. In the trap pipe 4, the water level becomes equal to or lower than the inlet 51 of the self-priming pipe 5 due to the drainage from the self-priming pipe 5.

  In the present embodiment, it is assumed that the water level L1 in the water storage tank 2 is lower than the top 3c of the siphon tube 3. Even in such a case, the trap level 4 connected to the siphon tube 3 is sealed with water, and the water level L1 remains in the siphon tube 3 in a state where the siphon tube 3 is opened to the atmosphere via the self-priming tube 5. When the height is higher than the top portion 3b, water flows into the trap pipe 4, and the flowed-in water also flows into the self-priming pipe 5, the inside of the self-priming pipe 5 is water-sealed, and the air A1 is sucked out by the fall of the sealed water. The flow rate increases and the drooping portion 33 of the siphon tube 3 is sealed with water. And by the fall of the sealing water, air A1 is further sucked out and a siphon action arises. As a result, siphon drainage can be started automatically. Moreover, since it is not necessary to suck out the air A1 from the siphon tube 3 using an air suction device such as a vacuum pump in order to start siphon drainage, the air suction device is not necessary, and the manufacturing cost is reduced. be able to.

  Further, since the horizontal pulling portion 32 and the drooping portion 33 are substantially orthogonal to each other, when water flows from the horizontal pulling portion 32 into the drooping portion 33, the water spreads in a substantially horizontal direction due to inertia and the upper end portion 33 b of the drooping portion 33. It becomes easy to cover the inner space of the pipe, and it becomes easy to seal with water. Therefore, siphon drainage can be generated quickly and reliably.

  Further, since the lower end portion of the self-priming tube 5 is bent in an L shape, the water flow is likely to stagnate at the lower end portion, and a water-sealed state is easily created in the self-priming tube 5. Therefore, the air A1 can be quickly and reliably sucked out by the falling of the sealed water.

Next, the drainage device 1 according to various modifications of the embodiment will be described with reference to the drawings. In description of each modification, the same code | symbol is attached | subjected to the same structural member as the said embodiment. Moreover, the description of the structural member is abbreviate | omitted and only the structure different from the said embodiment is demonstrated.
(First modification)
5A and 5B show the configuration of the drainage device 1 according to the first modification. In the drainage device 1 of the present modification, the siphon tube 3 has a pipeline separating tube 6 provided along the tube inner wall 33 a in the hanging portion 33. The pipe separation pipe 6 is configured by a cylindrical pipe, is in contact with the pipe inner wall 33 a, extends downward from substantially the same height as the upper end of the hanging part 33, and has a pipe length shorter than the hanging part 33. . The opening area of the pipe separation pipe 6 is desirably about 2/3 of the opening area of the hanging part 33.

  FIG. 6 shows one state during drainage in the drainage device 1 of the present modification. In that state, the in-pipe water level D1 of the horizontal pulling portion 32 is less than 50%, and the water that has flowed through the horizontal pulling portion 32 (water that has passed over the top of the siphon pipe) is separated from the pipe inner wall 33a by the water flow. It falls into the trap tube 4 (corresponding to the state of FIG. 3A in the above embodiment). Here, it is assumed that the in-pipe water level D <b> 1 is a water level at which the width of the water flow is wider than the pipe diameter of the pipe separation pipe 6. In that case, most of the water that is about to flow down into the trap pipe 4 flows into the inside of the pipe separation pipe 6 and seals the space inside the pipe separation pipe 6. It flows into the outer part 33 c of the pipe separation pipe 6 in the hanging part 33.

  Most of the water that flows into the inside of the pipe separation pipe 6 passes through the pipe separation pipe 6, and the other water is opposite to the water storage tank 2 side of the pipe separation pipe 6 due to the water flow. When it hits the pipe inner wall 6a, it jumps up at the pipe inner wall 6a and flows into the outer portion 33c. The water that has passed through the pipe separation pipe 6 falls in the space without connecting the pipe inner wall of the hanging part 33.

  The water that flows directly from the horizontal pulling portion 32 to the outer portion 33c wraps around the inner wall of the outer portion 33c from the horizontal pulling portion 32 side to the opposite side by the water flow. The space of the outer portion 33c is sealed with the water that has flown around and the water that has been splashed up.

  In this way, the space in the pipe separation pipe 6 and the space in the outer side portion 33c are sealed with water, so that the space in the pipe at the upper end portion 33b of the drooping portion 33 is water-sealed. It is formed.

  In this modification, compared to the above embodiment, the water flow rate in the siphon pipe 3 is small during the wastewater treatment, and the pipe water level D1 is less than 50%, for example, about 30%. However, a water-sealed state can be created in the hanging portion 33. Therefore, it is possible to quickly shift to siphon drainage due to the falling of the sealed water in the hanging portion 33, and the time required for drainage can be shortened.

  Compared with the above embodiment, in the drainage stage shown in FIG. 6, the amount of water flowing into the trap pipe 4 through the pipe inner wall of the hanging part 33 falls in the space of the hanging part 33 and traps. The ratio of the amount of water entering the tube 4 can be increased. Accordingly, more air A1 can be taken into the water in the trap tube 4 as bubbles A2, and can be discharged to the outside by being put on the water flow in the trap tube 4. Therefore, the shift to siphon drainage can be further accelerated.

(Second modification)
FIG. 7 shows a configuration of the drainage device 1 according to the second modification. In the drainage device 1 of this modification, the lower end of the self-priming pipe 5 is bent and extends upward. Hereinafter, the upwardly extending end portion of the self-priming tube 5 is referred to as an upward portion 52, and the suspended portion of the self-priming tube 5 on the trap tube 4 side is referred to as a drooping portion 53. The length H1 of the upward portion 52 of the self-priming pipe 5 is set according to the height H2 from the pipe top 3b of the siphon pipe 3 to the preset upper limit value L3 of the water level in the water tank 2. The length H1 is shorter than the height H2, and is set to 1 / n (n> 0) times the height H2, for example. The height H3 from the lower end of the drain port 41 of the trap pipe 4 to the lower end of the inlet 51 of the self-priming pipe 5 is designed to be substantially equal to the height H2.

  Here, the water level L1 in the water storage tank 2 is substantially equal to the overflow line L2, the trap pipe 4 is sealed with water, the water level in the trap pipe 4 is substantially the same height as the lower end of the inlet 51, and the self-priming pipe 5 is sealed with water, and the water level of the self-priming tube 5 is about the diameter of the tube.

  In this state, when the water level L1 further rises, the water in the siphon pipe 3 is pushed up, and the pushed-up water pushes the air A1 in the siphon pipe 3 and further flows into the trap pipe 4 and the self-priming pipe 5. To do. The air A1 pushes the water accumulated in the trap tube 4 and the self-priming tube 5. Therefore, even if water further flows into the trap pipe 4 and the self-priming pipe 5, the water level in the vertical pipe on the one end 4a side (siphon pipe 3 side) of the trap pipe 4 and the water level in the drooping portion 53 of the self-priming pipe 5 are substantially the same. Stay constant. On the other hand, the water level in the vertical pipe on the other end 4b side (drain port 41 side) of the trap pipe 4 and the water level in the upward portion 52 of the self-priming pipe 5 rise due to the inflowing water. This rise in the water level is substantially equal to the difference between the water level L1 in the water tank 2 and the height of the overflow line L2. In this state, the water pressure for pushing up the water in the siphon tube 3 and the pressure of the air A1 for restraining it are balanced.

  When the water level L1 further rises, water overflows from the self-priming pipe 5, but if the water level L1 does not exceed the upper limit L3, the pressure for pushing out the sealed water in the self-priming pipe 5 is insufficient and siphon drainage does not occur. . On the other hand, when the water level L1 exceeds the upper limit value L3, the sealed water in the self-priming pipe 5 is pushed out by the water pressure, and the suction of the air A1 due to the falling of the sealed water in the self-priming pipe 5 starts and shifts to siphon drainage.

  In this modification, water can be stored up to the preset upper limit L3 of the water level in the water storage tank 2 even if it is higher than the overflow line L2. Therefore, the drainage device 1 can be reliably started by the pressure of the water accumulated beyond the upper limit L3.

(Third Modification)
FIG. 8 shows a configuration of the drainage device 1 according to the third modification. The drainage device 1 of the present modification includes an atmosphere release pipes 7 and 8 communicating with the top 3c of the siphon pipe 3, and an adjustment valve 9 and a stop valve 10 for adjusting the opening degree of the atmosphere release pipes 7 and 8, respectively. Further prepare. The air release pipes 7 and 8 are both open to the atmosphere, with the end on the opposite side of the siphon pipe 3 being open.

  The pipe diameter of the air release pipe 7 is set so that the amount of outside air flowing into the siphon pipe 3 can maintain the siphon action even if the adjustment valve 9 is fully opened during siphon drainage. On the other hand, the pipe diameter of the air release pipe 8 is larger than the pipe diameter of the air release pipe 7, and when the stop valve 10 is fully opened during siphon drainage, the amount of outside air flowing into the siphon pipe 3 maintains the siphon action. It is set so that the amount is not possible. If siphoning cannot be maintained, siphon drainage stops.

  FIG. 9 shows a state when the adjustment valve 9 is opened during siphon drainage of the siphon pipe 3 in the drainage device 1 of the present modification. When the adjustment valve 9 is opened, outside air flows into the siphon tube 3 from the air release tube 7 and is mixed into the water in the siphon tube 3 as bubbles A2. By adjusting the opening degree of the atmosphere opening pipe 7 using the adjusting valve 9, the mixing amount of the bubbles A2 is adjusted.

  Since the bubble A2 has a function of weakening the water flow due to its buoyancy, when the amount of the bubble A2 mixed in increases, the drainage speed decreases accordingly, and the amount of drainage per unit time decreases. Therefore, the amount of discharged water per unit time increases or decreases by adjusting the mixing amount of the bubbles A2. As the drooping portion 33 is extended, the drainage speed increases and the amount of drainage increases, so that the adjustment range thereof can be widened.

  In this modification, the amount of drainage per hour can be simply increased or decreased by adjusting the amount of air bubbles A2 mixed by adjusting the opening of the air release pipe 7 in the siphon drainage.

(Fourth modification)
FIG. 10 shows a configuration of the drainage device 1 according to the fourth modification. The drainage device 1 further includes an air suction device 11 (air suction means). The air suction device 11 is inserted into the siphon tube 3 from the intake hole 34 provided in the top portion 3c of the siphon tube 3 through the air circulation tube 12. The air A1 is sucked. The air suction device 11 can be configured by a vacuum pump or the like. The air circulation pipe 12 has one end communicating with the intake hole 34 and the other end connected with the air suction device 11. In the middle of the air circulation pipe 12, a switching valve 13 is provided that switches between an air circulation state and a non-circulation state by an opening / closing operation. The self-priming tube 5 has a configuration equivalent to that of the second modified example (see FIG. 7).

  FIG. 11 shows a state in use of the drainage device 1 of the present modification. Before use, it is assumed that the water level L1 of the water tank 2 is below the overflow line L2, no overflow has occurred, and the trap pipe 4 and the self-priming pipe 5 are sealed. In this state, when the switching valve 13 is opened, the air circulation tube 12 is switched to the circulation state, and when the power of the air suction device 11 is turned on, the air suction device 11 is connected to the siphon tube 3 via the air circulation tube 12. The air A1 inside is sucked out. Thereby, the space in the siphon tube 3 becomes negative pressure, the water level in the siphon tube 3 rises, and overflow occurs.

  In this modification, even if the water level L1 in the water storage tank 2 is not more than the overflow line L2, it is possible to cause overflow by sucking out the air A1 in the siphon tube 3 by the air suction device 11, Draining can be started. Moreover, when starting the drainage, the force for sucking out the air A1 may be such that the water level in the siphon tube 3 can be made slightly higher than the overflow line L2 by the suction, and the water level in the siphon tube 3 It is not necessary that the siphon tube 3 is filled with water by raising the height to the maximum upper limit. Therefore, the air suction device 11 may have a suction capacity that is not so high, and the manufacturing cost can be reduced.

(Fifth modification)
FIG. 12 shows a configuration of the drainage device 1 according to the fifth modification. The drainage device 1 includes a pressure regulating pipe 14 having one end of the pipe communicated with the top 3c of the first siphon pipe 3, the other end opened, and bent in an inverted U shape. The open end 14 a of the pressure regulation pipe 14 is positioned at substantially the same height as the preset lower limit value L4 of the water level in the water tank 2.

  13 (a) and 13 (b) show, in time series, the state when the drainage device 1 of the present modification is in use. As shown in FIG. 13 (a), siphon drainage is performed in the drainage device 1, and then, as shown in FIG. 13 (b), the water level L1 in the water tank is the lower limit L4, that is, the pressure regulating pipe 14 is opened. It is assumed that the position is lower than the position of the end 14a. At that time, the open end 14a is opened to the atmosphere, and the atmosphere enters the pipe of the siphon pipe 3 through the pressure adjusting pipe 14 from the open end 14a, whereby the siphon pipe 3 is opened to the atmosphere. Therefore, the pressure balance in the pipe that causes the siphon action of the siphon pipe 3 is broken, and as a result, the drainage stops.

  In this modification, the drainage can be automatically stopped when the water level in the water storage tank 2 decreases to the lower limit L4 during siphon drainage.

  In addition, this invention is not limited to the structure of said embodiment and modification, Various deformation | transformation are possible according to a use purpose. For example, you may combine the structure of any modification among each modification mentioned above in another modification. Moreover, each condition range of the pipe water level D1 which produces each state of FIGS. 2-4 is not limited above.

DESCRIPTION OF SYMBOLS 1 Trap siphon drainage device 2 Water storage tank 3 Siphon pipe 3a Lower end 3b Pipe top part 33 Hanging part 33a Pipe inner wall 33c Outside part 34 of pipe line separation pipe Inlet part 4 Inlet hole 4 Trap pipe 4a One end 4b connected to siphon pipe The other end 42 The connecting part 5 The self-priming pipe 5a The lower end 52 The upward part 6 The pipe separating pipe 6a The pipe inner wall 7 The atmosphere opening pipe 9 The adjusting valve (valve)
11 Air suction device (air suction means)
14 Pressure regulating pipe A1 Air L1 in siphon pipe Water level L3 in water tank Upper limit L4 Lower limit W Water

Claims (3)

A trap having a siphon pipe formed by bending the upper part of a water absorption pipe having a lower end opened in the water tank into an inverted U-shape and hanging down, and discharging water stored in the water tank by the siphon action of the siphon pipe A siphon drainage device,
One end is connected to the hanging portion of the siphon tube, and the trap tube drains from the other end,
A self-priming pipe that branches off and hangs down from a connection portion of the trap pipe with the siphon pipe, and that has a lower end opened;
When the water level in the water storage tank becomes higher than the height of the top of the siphon tube in the state where the trap tube is sealed with water and the siphon tube is opened to the atmosphere through the self-priming tube, the siphon Water in the pipe flows into the trap pipe and the self-priming pipe,
In the self-priming pipe, at least a part of the self-priming pipe is sealed with the flowing water, and the air in the siphon pipe is sucked out by dropping the sealed water in the pipe to generate a negative pressure in the siphon pipe. , The negative pressure increases the flow rate of water in the siphon tube, and seals at least part of the drooping portion of the siphon tube,
The siphon pipe discharges air in the siphon pipe from the trap pipe by dropping the sealing water in the drooping portion, fills the space in the siphon pipe with water, causes siphon action, and drains from the trap pipe. A trap siphon drainage device characterized by: The siphon pipe has a pipe separation pipe provided in the hanging portion so as to be along the pipe inner wall on the water storage tank side,
When the water beyond the top of the siphon pipe hits the pipe inner wall opposite to the water storage tank side of the pipe separation pipe due to the water flow, the water is splashed up, and the pipe separation pipe of the pipe separation pipe is The trap siphon drainage device according to claim 1, wherein the trap siphon drainage device flows into an outer portion. One end is connected to the top of the siphon tube, the other end is opened, and the pressure control tube is further bent into an inverted U shape,
The trap siphon drainage according to claim 1 or 2 , wherein an open end of the pressure adjusting pipe is positioned so as to be the same height as a preset lower limit value of a water level of the water storage tank. apparatus.

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