JP4560630B2 - Circulating liquid tank device - Google Patents

Description

  The present invention relates to a drainage pipe unit used for a liquid tank such as a pool or a bathtub, and a circulation type liquid tank apparatus using the drainage pipe unit.

  The swimming pool has a drain for circulating water and a drain for draining water during cleaning and repair. A painful accident in which a child is adsorbed by this drainage outlet has occurred. As a measure to prevent accidents, it is common to install a grid-like lid at the drain outlet, but a swimmer may intentionally remove the lid, or the stopper may be corroded by chlorine in water and the lid may come off. In some cases, accidents have been reported.

  Moreover, a circulating bath apparatus such as a jet bath may be installed in a bathtub for a human to take a bath. This circulation bathtub apparatus is also provided with a drain outlet for circulating hot water. There are also accidents in which the body of the bather is adsorbed or the hair is sucked into the drain.

  In order to solve the above-mentioned problems in the swimming pool, for example, a “danger prevention system at the drain of a pool” described in Patent Document 1 has been proposed. This danger prevention system, in a pool where water drained from the pool outlet by the circulation pump is circulated again into the pool and reused, on the back of the water-permeable cover covering the drain outlet or in the vicinity thereof, A sensor that consists of a load cell that operates by partial or total displacement of the cover facing backward is installed, and an abnormal situation in which foreign matter or the like blocks the drainage port based on an input signal of pressure change detected by this sensor. In this case, a control circuit is provided that generates a signal for operating the danger prevention means when it is determined. As a result, when a dangerous situation such as inhalation of foreign matter such as a human body occurs at the drain outlet at the bottom of the pool, it is possible to immediately cope with this and prevent accidents.

  However, the “danger prevention system at the drain of a pool” described in Patent Document 1 electrically controls a mechanically configured movable part, and regular maintenance is indispensable. Moreover, even if maintenance is sufficiently performed, there is still a possibility that the system will fail, and safety cannot be said to be sufficient. Furthermore, the equipment itself tends to be expensive, and the installation work itself is laborious and expensive.

  On the other hand, in order to solve the above-mentioned problem in the circulating bath apparatus, for example, a “jet bath safety device” described in Patent Document 2 has been proposed. This safety device is provided in a jet bath device that takes hot water in the bathtub from the suction port into the pump through the suction pipe and jets it from the jet port, and is a safety device that ensures safety when foreign objects are sucked from the suction port. The bypass suction port provided separately from the suction port, the bypass piping connecting the suction piping and the bypass suction port, and the suction piping side provided in the bypass piping has a negative pressure of a certain level or more. And a negative pressure actuating valve that opens at a low pressure. As a result, when a negative pressure of a certain level or more is generated by sucking foreign matter from the suction port, the negative pressure operation valve opens and hot water is supplied from the bypass suction port to the suction side piping through the bypass piping. It is said that the negative pressure becomes small, and foreign substances can be easily separated from the suction port.

  However, the “safety device for jet baths” described in Patent Document 2 also uses a negative pressure valve having a mechanically movable part, and has the same problems as the invention described in Patent Document 1, such as requiring regular maintenance. I had a point.

  In order to solve these problems all at once, the inventors of the present application proposed a drain pipe unit that controls the suction pressure at the time of adsorption by the flow of the fluid itself in Non-Patent Document 1. This drain pipe unit applies the characteristics of a vortex fluid element, which is a kind of fluid element, and its conceptual structure is shown in FIG. As shown in the figure, two inflow pipes 9a and 9b attached in parallel to the tangential direction on the outer periphery of a cylindrical vortex chamber 8 having a thin inner space shape are two drainage ports on the bottom 51 of the liquid tank. 53a and 53b, and a discharge pipe 41 attached in the axial direction to the center of one side 83 of the vortex chamber 8 is connected to a drainage pipe (not shown). The drainage pipe unit is called “parallel drainage pipe unit”).

  With the above configuration, when a foreign substance such as a bather (columnar foreign substance 55 in FIG. 10) is adsorbed to one drainage port 53b, the flow flows into the vortex chamber 8 from the other drainage port 53a. Will generate a strong swirling flow inside the vortex. Due to this centrifugal force field due to the swirling flow, a strong negative pressure gradient is generated in the vortex chamber from the outer periphery toward the center, and the pressure in the outer periphery is close to the pressure of the inflow portion of the drainage port 53a, that is, the liquid pressure of the liquid tank bottom surface 51. Value. As a result, the downstream pressure of the adsorption portion of the drainage port 53b is also close to the pressure (hydraulic pressure) of the liquid tank bottom surface 51, and the pressure difference between the upstream and downstream of the adsorption portion is reduced. If this pressure difference becomes small, the suction pressure at the time of adsorption (inlet pipe pressure on the side of the drainage that has been adsorbed) becomes weak, and bathers and the like can leave the adsorption state. The parallel drainage pipe unit 7 previously proposed by the inventors of the present application has no mechanical moving parts or electrical contacts, is maintenance-free, does not have a risk of failure, and has a simple configuration and is relatively easy to install. It has the excellent feature of being. Hereinafter, the “suction pressure at the time of suction” is simply referred to as “suction force at the time of suction”.

  Although it is the conventional parallel type drainage unit 7 which has the above characteristics, in order to secure further safety, reduction of the suction power at the time of adsorption was earnestly desired.

JP 2001-73576 A (Claim 1, FIG. 1) JP-A-8-224284 (FIG. 2) Hidetomi Yoshitomi and two others, “Study on a drain tube with a vortex chamber that controls suction force by the flow of the fluid itself” April 2002, Proceedings of the Society of Air Conditioning and Sanitation Engineering No.85

  The present invention drastically improves the safety of a conventional parallel drainage pipe unit. In other words, there are no mechanical moving parts or electrical contacts, maintenance-free, no worry of failure, simple construction, and relatively easy installation work. Another object of the present invention is to provide a drainage pipe unit in which the suction force at the time of adsorption is significantly reduced and the safety is further improved, and a circulating liquid tank apparatus using such a drainage pipe unit.

  The above-mentioned problem is a drainage pipe unit for discharging the liquid stored in the liquid tank, and is a first vortex chamber having a circular cross section and one end side (outlet side) connected to the vortex chamber. An inflow pipe, a second inflow pipe having one end side (outlet side) connected to the vortex chamber, and a spout opening penetrating the central portion of one side surface of the vortex chamber in the axial direction. The inflow pipe and the second inflow pipe are linearly opposed from the left and right in the tangential direction at a predetermined position on the inner periphery of the vortex chamber, and one end side (outlet side) is connected to the vortex chamber in communication with each other. This is solved by providing a drainage pipe unit characterized by the following. The other end side (inlet side) of the first inflow pipe and the other end side (inlet side) of the second inflow pipe are connected in communication with the liquid tank. As a result, the liquid stored in the liquid tank flows into the inflow pipe from both the inlets, and is discharged from the discharge port through the vortex chamber. When either the first inflow pipe or the second inflow pipe adsorbs foreign matter such as a human body from the inside of the liquid tank, the tangential direction enters the vortex chamber through the inflow pipe on the non-adsorbed side. The liquid flowing in from the inside causes a strong swirling flow in the vortex chamber, and as will be described later, the suction force during adsorption can be further reduced as compared with a conventional parallel drainage pipe unit. Here, the “swirl flow” refers to a flow in which the liquid that has flowed into the vortex chamber having a circular cross-section from the tangential direction at a predetermined position on the inner periphery swirls in the vortex chamber. The position where the other end side (inlet side) of the first inlet pipe is connected to the liquid tank and the position where the other end side (inlet side) of the second inlet pipe is connected to the liquid tank are , Both will be in different positions.

  The inventor of the present application has sought for a safer drainage pipe unit and conducted extensive research and development in order to further reduce the suction force during adsorption as compared with the conventional parallel drainage pipe unit 7 shown in FIG. As a result, the opposed drainage unit 1 illustrated in FIG. 1 was completed. Normally, if one end side (outlet side) 32a and 32b of the two inflow pipes 3a and 3b are opposed to each other, energy loss may occur due to interference between the drainage liquids, and the drainage efficiency may decrease. Yes, and will be avoided by those skilled in the art. However, the inventor of the present application indicates that the first inflow pipe 3a and the second inflow pipe 3b are linearly opposed from the left and right in the tangential direction at a predetermined position of the inner peripheral portion of the vortex chamber 2, and are one end side ( Surprisingly, the suction force at the time of adsorption was remarkably reduced by adopting the characteristic configuration of the present invention in which the outlet side 32a and 32b were connected in communication. As a result, it is possible to provide a drainage pipe unit with further improved safety.

  Here, the “liquid tank” is a concept including not only a bathtub and a pool tank but also a general tank such as a fish appreciation water tank or a chemical plant liquid storage tank. “Draining” means to discharge the liquid in the liquid tank to the outside. Even if the liquid that has been discharged is returned to the liquid tank again, the liquid in the liquid tank is discharged to the outside. As such, it falls under “emission”. Furthermore, “discharge” includes not only discharging the liquid in the liquid tank to the outside by the action of gravity but also sucking it out from the liquid tank and discharging it to the outside. Furthermore, the “circular cross-sectional vortex chamber” means that the liquid flowing in from the tangential direction at a predetermined position on the inner periphery of the vortex chamber causes a flow (swirl flow) that swirls in the vortex chamber. Refers to a vortex chamber having a circular cross section, and includes not only a thin cylindrical shape but also a vortex chamber having an internal space shape such as a thick cylindrical shape, a conical shape, and an abacus bead shape.

  Moreover, as the circulation type liquid tank apparatus provided with the above-mentioned opposed drain pipe unit, the circulation type liquid tank apparatus configured to discharge the liquid stored in the liquid tank and then circulate it back into the liquid tank. The vortex chamber having a circular cross section disposed outside the liquid tank, and one end side (outlet side) of the vortex chamber so that the liquid stored inside the liquid tank flows into the vortex chamber. A first inflow pipe connected in communication and connected to the first drainage port penetrating the liquid tank at the other end side (inlet side), and the liquid stored in the liquid tank inside the vortex chamber A second inflow in which one end side (outlet side) is connected to the vortex chamber so as to flow in, and the other end side (inlet side) is connected to a second drainage port penetrating the liquid tank. A first pump that includes a pipe, a liquid discharge port that penetrates the central portion of one side surface of the vortex chamber in the axial direction, and a circulation pump that is connected to the liquid discharge port. And the second inflow pipe are linearly opposed from the left and right in the tangential direction at a predetermined position on the inner periphery of the vortex chamber, and one end side (outlet side) is connected to the vortex chamber in communication with each other. A circulating liquid tank apparatus is presented. Here, the “connection” in the “circulation pump connected to the discharge port” is not only when the circulation pump is directly connected to the discharge port, but also indirectly through other piping or the like. Including the case of connecting to. In addition, since the other end side (inlet side) of the inflow pipe is connected to the drain port, foreign substances such as a human body are adsorbed to the drain port in the circulation type liquid tank apparatus of the present invention. It is the same phenomenon that foreign matter such as a human body is adsorbed to the inflow pipe.

  At this time, it is preferable that the first drainage port and the second drainage port be a circulation type liquid tank apparatus that penetrates into the liquid tank at an interval equal to or larger than the inner diameter of the vortex chamber having a circular cross section. Here, the “inner diameter” refers to the inner diameter of the vortex chamber having a circular cross section. For example, when the inner diameter of the vortex chamber changes in the axial direction, such as a conical shape, the inner diameter of the longest portion. The diameter of

  This makes it possible to further improve the safety of the circulating liquid tank apparatus while the construction of the inflow pipe is simple and the energy loss inside the inflow pipe is small.

  Also in the circulation type liquid tank apparatus in which the opposed drainage unit of the present invention is arranged, the human body etc. only in one of the two drainage ports, as in the case where the conventional parallel drainage pipe unit is arranged. When the foreign matter is adsorbed, the effect of reducing the suction force at the time of adsorption appears. However, in the unlikely event that a human body or the like is adsorbed simultaneously by the two drainage ports, the effect of reducing the suction force during adsorption cannot be expected. Considering this, it is preferable to provide the two drainage ports as far apart as possible so that the human body or the like is not simultaneously adsorbed by the two drainage ports.

  However, when the interval between the two drainage ports 53a and 53b is increased beyond the inner diameter of the vortex chamber 8 in the circulation type liquid tank apparatus provided with the conventional parallel drainage pipe unit (see FIG. 10), As shown in Fig. 11, not only the first inflow pipe 9a and the second inflow pipe 9b are bent, but the handling is complicated, and the energy loss when the liquid flows in the inflow pipe increases, resulting in a smooth flow. Was sometimes inhibited. However, in the circulation type liquid tank apparatus provided with the opposed drainage pipe unit of the present invention, even when the interval between the two drainage ports is widened to about the inner diameter of the vortex chamber, FIG. As shown, the first inflow pipe 3a and the second inflow pipe 3b (hereinafter referred to as both inflow pipes 3a and 3b) as compared with the case where a conventional parallel drainage pipe unit is provided (FIG. 11). In some cases, the number of bent portions can be reduced. This simplifies the handling of both inflow pipes 3a and 3b, makes the construction easier, and increases the safety of the circulating liquid tank device with less energy loss inside both inflow pipes. is there.

  Moreover, it can be set as the circulation-type liquid tank apparatus which arrange | positioned the vortex chamber in the vertical type outside the liquid tank. Accordingly, the vortex chamber can be arranged with a small installation area, and a circulating liquid tank apparatus that can be easily installed even in a small installation space such as a bathroom can be obtained.

  A circulation type liquid tank apparatus in which the vortex chamber is disposed laterally outside the liquid tank may be used. When the vortex chamber is disposed below the liquid tank or when there is a certain amount of installation space, the vortex chamber is preferably disposed in a horizontal shape. If the vortex chambers are arranged horizontally, the position heads of the flow in the vortex chamber are almost equal, and are less susceptible to the influence of gravity when a swirl flow is generated. Thereby, the swirl flow in the inside of the vortex chamber becomes smoother, and a circulation type liquid tank apparatus having a high effect of reducing the suction force during adsorption can be obtained. The larger the vortex chamber diameter, the smoother the swirl flow by arranging the vortex chamber in a horizontal shape.

  By integrally forming the casing of the vortex chamber and the casing of the circulation pump, a circulation type liquid tank apparatus in which the vortex chamber and the circulation pump are unitized can be obtained. As a result, the circulation type liquid tank apparatus is small, compact and easy to install.

  According to the present invention, there is no mechanical moving part or electrical contact, maintenance-free, no worry of failure, simple construction and relatively easy installation work. In addition, it is possible to provide a drainage pipe unit in which the suction force at the time of adsorption is remarkably reduced and the safety is further improved, and a circulation type liquid tank apparatus provided with such a drainage pipe unit.

  Hereinafter, the opposing drainage pipe unit and the circulation type liquid tank apparatus of the present invention will be described in detail with reference to the drawings. 1-4 is a figure for demonstrating the opposing drainage pipe unit of this invention, and FIGS. 5-9 demonstrates the circulation type liquid tank apparatus which arrange | positioned the opposing drainage pipe unit of this invention. It is a figure for doing. On the other hand, FIG. 10 is a diagram for explaining a conventional parallel drainage pipe unit, and FIGS. 11 and 12 are diagrams for explaining a circulation type liquid tank apparatus provided with a conventional parallel drainage pipe unit. FIG. FIGS. 13 to 15 are views for explaining a mechanism and the like in which the suction force at the time of adsorption decreases in the opposed drainage unit of the present invention.

  First, the opposing drainage pipe unit 1 of the present invention will be described with reference to FIGS. In these figures, the first inflow pipe 3a extends to the right side of the figure and the second inflow pipe 3b extends to the left side of the figure, but is omitted for convenience of explanation. As shown in FIG. 1 and FIG. 2, the opposing drainage pipe unit 1 of the present invention includes a vortex chamber 2 through which a discharge port 24 penetrates, a first inflow pipe 3a, and a second inflow pipe 3b. It consists of Hereafter, the said component which comprises the opposing drainage pipe unit 1 of this invention is demonstrated in order. In this example, the liquid discharge pipe 41 is connected to the liquid discharge port 24.

[Drainage pipe unit: Vortex chamber]
The internal space of the vortex chamber 2 has a circular cross section. Thus, as will be described later, when either the first inflow pipe 3a or the second inflow pipe 3b adsorbs a foreign substance such as a human body, the vortex chamber portion 20 from the tangential direction through the other inflow pipe 20 The liquid that flows into the vortex chamber causes a swirling flow in the vortex chamber 20 (in FIG. 1, a state where the second inflow pipe 3b has adsorbed foreign matter is schematically shown using a cross x). The internal space shape of the vortex chamber 2 is not limited to the thin cylindrical shape as shown in FIG. 1, but as shown in FIG. 4, the abacus bead shape (a), the thick cylindrical shape (b), the conical shape (c), the center Various shapes such as a columnar shape (d) recessed over the part can be used. That is, the internal space shape of the vortex chamber 2 only needs to be circular in cross section so that the liquid flowing into the vortex chamber 2 from the tangential direction of the inner peripheral portion causes a swirling flow. As shown in FIG. 2, the first inflow pipe 3a and the second inflow pipe 3b are provided on the outer peripheral wall 21 of the vortex chamber at a predetermined position on the inner periphery of the vortex chamber 2 (in this figure, the upper end position of the inner periphery). In order to communicate with the vortex chamber 2 from the outlet side (one end side) 32a, 32b, respectively, the two connecting holes 22a, 22b are penetrated adjacent to each other. Yes.

  Further, the vortex chamber 2 is provided with a liquid discharge port 24 penetrating from the inside of the vortex chamber 2 to the outside in the axial direction at the center of the one side surface 23. Both inflow pipes 3a and 3b are connected from the inside of the liquid tank. The liquid that has flowed into the vortex chamber 20 through the discharge port 24 is discharged. In the present embodiment, the liquid discharge pipe 41 is connected to the liquid discharge port 24, and the liquid flowing into the vortex chamber 20 from the inside of the liquid tank is discharged from the liquid discharge pipe 41. May not be provided.

  The material constituting the vortex chamber 2 is not particularly limited as long as it is not eroded by the liquid. If the liquid is water, the exterior part (casing) may be made of stainless steel or hard vinyl chloride resin.

  The inner diameter of the vortex chamber 2 having a circular cross section is not particularly limited, and is actually determined in consideration of the size of the liquid tank, the inner diameters of both the inflow pipes 3a and 3b, and the like. For example, when arrange | positioning in a household bathtub, it is preferable that the internal diameter of the vortex chamber 2 is 8-25 cm. If the inner diameter is smaller than 8 cm, energy loss in the normal state increases, which is not preferable. If the inner diameter is larger than 25 cm, it is difficult to secure an installation space, and the vortex chamber itself is expensive. When arrange | positioning in a domestic bathtub, the internal diameter of the vortex chamber 2 becomes like this. More preferably, it is 10-20cm. Moreover, when arrange | positioning in a pool, it is preferable that the internal diameter of the vortex chamber 2 is 50-130 cm, More preferably, it is 60-100 cm.

  The internal thickness L of the vortex chamber 2 is not particularly limited. When the vortex chamber 2 is cylindrical, the ratio L / Dv to the inner diameter Dv of the vortex chamber 2 is preferably 0.1 to 1. When L / Dv is less than 0.1, energy loss in normal flow increases. When L / Dv is greater than 1, the suction force during adsorption increases. The ratio L / Dv to the inner diameter of the vortex chamber 2 is preferably 0.15 to 0.5, more preferably 0.2 to 0.4. The internal thickness L of the vortex chamber 2 is preferably the same as or larger than the inner diameters of both inflow pipes 3a and 3b described later.

  The inner diameter De of the spout 24 is not particularly limited, but is preferably 0.05 to 0.7 in the ratio De / Dv with the inner diameter Dv of the vortex chamber 2. When De / Dv is less than 0.05, the energy loss in the normal flow increases. If De / Dv is greater than 0.7, the suction force during adsorption increases. The ratio with the inner diameter of the vortex chamber 2 is preferably 0.1 to 0.5, more preferably 0.15 to 0.4.

[Drainage pipe unit: first inflow pipe and second inflow pipe]
The first inflow pipe 3a and the second inflow pipe 3b communicate with the inside of the liquid tank and the inside of the vortex chamber 20 so that the liquid stored inside the liquid tank flows into the inside of the vortex chamber 20. More specifically, as shown in FIGS. 2 and 3, the liquid flowing into the vortex chamber 20 through the first inflow pipe 3 a and the second inflow pipe 3 b is located at a predetermined position on the inner periphery of the vortex chamber 2. The first inflow pipe 3a and the second inflow pipe 3b are respectively introduced into the vortex chamber 20 from opposite directions on the left and right in the tangential direction at 26 (in FIG. 2 and FIG. 3, the inner peripheral upper end position). Outflow side (one end side) 32a and 32b are connected in communication with the vortex chamber 2 so as to be linearly opposed from the left and right in the tangential direction at a predetermined position on the inner peripheral portion of the vortex chamber 2, respectively. And the outflow side (one end side) 32a, 32b of both inflow pipes 3a, 3b is notched in an arc shape according to the inner peripheral part shape of the vortex chamber 2, and is formed at an acute angle. As shown in the figure, the outlet portion 33 of the inflow pipes 3a, 3b formed at an acute angle faces the vortex chamber 2 so that the tip portion facing position 33 is substantially equal to the predetermined position 26 of the inner peripheral portion of the vortex chamber 2. The side (one end side) 32a and 32b are connected in communication.

  The first inflow pipe 3a connects the inside of the liquid tank and the inside of the vortex chamber 20 by connecting the inlet side (the other end side) to the first drainage port penetrating the liquid tank. Similarly, the second inflow pipe 3b communicates the inside of the liquid tank and the vortex chamber 20 by connecting the inlet side (the other end side) to a second drainage port penetrating the liquid tank. Will do.

  The material of both the inflow pipes 3a and 3b is not particularly limited as long as it is not eroded by the liquid. If the liquid is water, an inflow pipe made of stainless steel or hard vinyl chloride resin can be used. The inner diameters of both inflow pipes 3a and 3b are not particularly limited, but are preferably equal to or less than the internal thickness L of the vortex chamber 2, and can be selected within a range of about 0.1 to 20 cm under these conditions. The inner diameters of both inflow pipes 3a and 3b are preferably 0.2 to 10 cm, and more preferably 0.4 to 5 cm.

  Next, with reference to FIGS. 5 to 9, a circulation type liquid tank apparatus provided with the opposed drainage pipe unit 1 of the present invention will be described. 5 and 6, for convenience of explanation, the liquid tank 5 is represented by a two-dot chain line only for a part of the liquid tank bottom surface 51. Therefore, the space above the liquid tank bottom 51 is the liquid tank interior 50. First, the first embodiment of the present circulation type liquid tank apparatus will be described with reference to FIG.

[Circulating liquid tank apparatus: first embodiment]
In the first embodiment shown in FIG. 5, the opposing drainage pipe unit 1 is disposed below the liquid tank 5. The vortex chamber 2 is arranged vertically on the lower side of the liquid tank 5. A first drainage port 53a and a second drainage port 53b (hereinafter may be referred to as both drainage ports 53a and 53b) are penetrated through the bottom surface 51 of the liquid tank at a predetermined interval 53L. And the 1st inflow which connected the outflow side (one end side) 32a to the vortex chamber 2 so that the liquid stored in the liquid tank might flow out from the 1st drainage port 53a and may flow in into the vortex chamber. The inlet side (other end side) 31a of the pipe 3a is connected in communication with the first drainage port 53a. Similarly, the second outlet 32b is connected to the vortex chamber 2 so that the liquid stored in the liquid tank flows out of the second drainage port 53b and flows into the vortex chamber. The inlet side (other end side) 31b of the inflow pipe 3b is connected to the first drainage port 53b. As a result, the first inflow pipe 3a and the second inflow pipe 3b communicate with the liquid tank interior 50 and the inside of the vortex chamber so that the liquid stored in the liquid tank interior 50 flows into the vortex chamber. become. As shown in this figure, it is preferable to form both inflow pipes 3a and 3b symmetrically, and to arrange the vortex chamber 2 and both inflow pipes 3a and 3b so that the opposing drainage pipe unit 1 is symmetrical. .

  The first inflow pipe 3a and the second inflow pipe 3b are linearly opposed from the left and right in the tangential direction at a predetermined position on the inner peripheral portion of the vortex chamber 2, and the outlet side (one end side) 32a and 32b are respectively The vortex chamber 2 is connected in communication. Thus, when either the first inflow pipe 3a or the second inflow pipe 3b adsorbs foreign matter such as a human body, the liquid flowing into the vortex chamber from the tangential direction via the other inflow pipe swirls. This causes a flow and reduces the suction force during adsorption. The liquid that has flowed into the vortex chamber flows from the discharge port 24 that penetrates the central portion of the one side surface 23 in the axial direction to the circulation pump (not shown) via the discharge tube 41, and is connected to the piping (not shown). It will return to the inside 50 of a liquid tank through again. In the first embodiment, the interval 53L between the first drainage port 53a and the second drainage port 53b is wider than the inner diameter 2R of the vortex chamber 2 having a circular cross section.

  It is safer to make the gap 53L between the drainage ports 53a and 53b provided on the bottom 51 of the liquid tank as wide as possible, and is preferably 30 cm or more. As a result, it is possible to reduce the possibility that the bather or the like is simultaneously adsorbed by both the drainage ports 53a and 53b. The distance 53L between the drainage ports 53a and 53b is more preferably 50 cm or more. The wider this interval, the lower the possibility that the bather or the like will be simultaneously adsorbed by the two drainage ports 53a, 53b, but the upper limit is mainly limited by the size of the liquid tank 5. In order to reduce the possibility that bathers and the like are simultaneously adsorbed to both drainage ports 53a and 53b, the interval 53L between the drainage ports 53a and 53b may be wider than the inner diameter 2R of the vortex chamber 2 having a circular cross section. Many.

  FIG. 11 shows a case where a conventional parallel drain pipe unit 7 is provided in place of the opposed drain pipe unit 1 of the present invention in FIG. Also in this figure, for convenience of explanation, the liquid tank 5 is expressed by a two-dot chain line for only a part of the liquid tank bottom surface 51. As shown in FIG. 5, when the opposed drainage unit 1 of the present invention is installed, the bent portions of both inflow pipes 3a, 3b (9a, 9b) can be configured to be small. This not only facilitates construction, but also reduces energy loss inside the inflow pipe, allowing the liquid to flow more smoothly.

  In the first embodiment shown in FIG. 5, the vortex chamber 2 is arranged vertically, but is not limited to this, and may be arranged horizontally (described later in the second embodiment) or obliquely. You may incline and arrange | position. However, when the installation area is small, it is preferable to arrange in a vertical shape as in the first embodiment. Moreover, in this 1st embodiment, although both inflow pipes 3a and 3b are connected in communication by the inner peripheral part upper end position of the vortex chamber 2, it is not limited to this, For example, the inner peripheral part lower end position of the vortex chamber 2 The two inflow pipes 3a and 3b may be connected in communication. However, the configuration as in the first embodiment is preferable because a stable suction force reducing effect can be obtained because air can easily escape to the outside even when air enters the upper end of the vortex chamber 20. Further, in the first embodiment, both the drainage ports 53a and 53b are provided on the bottom surface 51 of the liquid tank, but may be provided on the wall surface of the liquid tank 5 (which will be described later in the third embodiment). . In addition, although this 1st embodiment is a thing about a circulation-type liquid tank apparatus, installing the opposing drainage pipe unit 1 of this invention is not limited to a circulation-type liquid tank apparatus, it passes through the discharge pipe 41. Alternatively, the liquid may be allowed to flow into the sewer or the like without being returned to the liquid tank interior 50 via the circulation pump.

[Circulating liquid tank device: second embodiment]
Next, a second embodiment of the circulation type liquid tank apparatus in which the opposing drainage pipe unit 1 of the present invention is disposed will be described with reference to FIG. A major difference from the first embodiment is that the vortex chamber 2 is arranged horizontally.

  By arranging the vortex chamber 2 horizontally, it becomes difficult to be affected by gravity when a swirl flow is generated in the vortex chamber. For this reason, a swirl flow becomes smoother and it can be set as the circulation type liquid tank apparatus with a higher suction force reduction effect.

  7-9 is a figure which illustrates the circulation type liquid tank (tub) apparatus which arrange | positioned the opposing drainage pipe unit 1 of this invention in the bathtub 6. FIG. First, the third embodiment of the circulation type liquid tank apparatus in which the opposing drainage pipe unit 1 of the present invention is disposed will be described with reference to FIG.

[Circulating liquid tank device: third embodiment]
The third embodiment shown in FIG. 7 is a circulation type liquid tank (tub) device configured to discharge water stored in the bathtub interior 60 and then circulate it back to the bathtub interior 60. A vortex chamber 2 having a circular cross section disposed vertically adjacent to the side outer wall surface 64a, and one end side of the vortex chamber 2 so that water stored in the bathtub interior 60 flows into the vortex chamber ( A first inflow pipe 3a in which the other outlet side (inlet side) 31a is connected in communication with the first drainage port which is pierced through the right side wall 62a of the bathtub 6; One end side (outlet side) 32b is connected to the vortex chamber 2 so that the water stored in the vortex chamber flows into the vortex chamber, and a second drainage port penetrating the left side wall 62b of the bathtub 6 is provided. A second inflow pipe 3b in communication with the other end side (inlet side) 31b, a water outlet that penetrates the center of one side surface 23 of the vortex chamber 2 in the axial direction, and the water discharge The first inflow pipe 3a and the second inflow pipe 3b are linearly opposed from the left and right in the tangential direction of the inner peripheral portion of the vortex chamber 2 at a predetermined position. An example of the circulation type liquid tank (tub) device is characterized in that one end side (outlet side) 32a, 32b is connected to the vortex chamber 2 in communication.

Here, “water” refers to a substance called H ₂ O, and is not used depending on the temperature difference between water and hot water. That is, the water here includes both water and hot water. The “connection” in the “circulation pump connected to the water discharge port” is not only the case where the circulation pump is directly connected to the water discharge port, but also indirectly connected through the water discharge pipe 41 shown in FIG. This includes cases where

  With the above configuration, the water stored in the bathtub interior 60 flows into the vortex chamber through the left and right inflow pipes 3a and 3b. When either the first inflow pipe 3a or the second inflow pipe 3b adsorbs a bather or the like, the liquid flowing into the vortex chamber from the tangential direction through the other inflow pipe is swirled. This causes the suction force during adsorption to be reduced. The water that has flowed into the vortex chamber flows from the water outlet provided on one side surface 23 of the vortex chamber 2 to the circulation pump (not shown) through the water discharge pipe 41, and again through the pipe (not shown). Return to the interior 60.

  In the third embodiment, since the vortex chamber 2 is installed vertically, the opposing drainage pipe unit 1 can be installed even in a bathtub having a small installation space. As in the first embodiment, the left and right inflow pipes 3a and 3b are linearly opposed from the left and right in the tangential direction at the upper end of the inner peripheral portion of the vortex chamber 2 and are connected to the vortex chamber 2 in communication with each other. As a result, a stable effect of reducing the suction force during adsorption can be obtained.

  FIG. 12 shows a case where a conventional parallel drain pipe unit 7 is provided in place of the opposed drain pipe unit 1 of the present invention in FIG. The circulation type liquid tank apparatus of FIG. 7 provided with the opposed drainage pipe unit 1 of the present invention can be configured with fewer bent portions of the left and right inflow pipes 3a, 3b (9a, 9b). As a result, as in the first embodiment, not only the construction is facilitated, but also the energy loss inside the inflow pipe is reduced and the liquid can flow more smoothly.

  In the third embodiment, the vortex chamber 2 is arranged in a vertical type, but is not limited to this, and may be arranged in a horizontal type or may be installed obliquely. However, as described above, when the installation space is small, it is preferable to arrange in a vertical type as in the third embodiment. When the vortex chamber 2 has a sufficient installation space, the swirl flow becomes smoother and the effect of reducing the suction force at the time of adsorption is enhanced by arranging the vortex chamber 2 in a horizontal manner as in the second embodiment. Moreover, in this 3rd embodiment, although both inflow pipes 3a and 3b are connected in communication by the inner peripheral part upper end position of the vortex chamber 2, it is not limited to this, For example, the inner peripheral part lower end position of the vortex chamber 2 The two inflow pipes 3a and 3b may be connected in communication. However, as described above, the configuration as in the third embodiment is preferable because a stable suction force reducing effect can be obtained.

[Circulating liquid tank device: Fourth embodiment]
Finally, a fourth embodiment of the circulation type liquid tank (tub) device in which the opposed drainage unit 1 of the present invention is disposed will be described with reference to FIGS. FIG. 9 is an enlarged cross-sectional view of a cut surface extending vertically through the line AA ′ of FIG.

  In the fourth embodiment, as in the third embodiment, the vortex chamber 2 is disposed vertically adjacent to the front outer wall surface 64a of the bathtub 6. Then, as shown in FIG. 9, the vortex chamber 2 and the circulation pump 42 are unitized by integrally forming the casing 25 of the vortex chamber 2 and the casing 45 of the circulation pump 42, and the spout 24 and the circulation pump. 42 suction ports 43 are directly connected. Thus, the circulation type liquid tank apparatus is compact and easy to install. The water that has flowed into the vortex chamber 20 flows directly from the spout 24 to the circulation pump 42, and returns to the inside of the bathtub again through a pipe (not shown). In the fourth embodiment, since the water outlet 24 and the suction port 43 of the circulation pump 42 are directly connected, the water discharge pipe 41 (see FIG. 7) is not connected to the water outlet 24.

  In the present embodiment, the vortex chamber 2 is arranged vertically, but is not limited to this and may be installed horizontally. For example, the vortex chamber can be disposed so that the water discharge port 24 faces upward, and the circulation pump 42 can be mounted and connected from above so that the suction port 43 faces downward. Alternatively, the vortex chamber 2 may be disposed so that the water discharge port 24 faces downward, and the circulation pump 42 may be contacted from below so that the suction port 43 faces upward.

  Hereinafter, the mechanism by which the suction force at the time of adsorption of the opposed drainage unit of the present invention is weakened as compared with the conventional parallel drainage unit will be described with reference to FIG. 13 and FIG. In this explanation, the position head is not considered, but even if it is taken into consideration, in the comparison between the opposed drainage pipe unit of the present invention and the conventional parallel drainage pipe unit, basically The same treatment can be done.

[Reduction mechanism of suction force during adsorption: qualitative evaluation]
FIG. 13 shows a schematic diagram when foreign matter is adsorbed to the inflow pipe. The suction force applied to the foreign matter adsorbed at this time is obtained by multiplying the differential pressure between the outer surface and the inner surface of the adsorbate (foreign matter) by the tube cross-sectional area.
Here, F: suction force during adsorption, A _s : cross-sectional area of the inflow pipe, P ₁ : water pressure on the outer surface, and P _m : pressure in the inflow pipe.

Since the inlet pipe sectional area A _s and pressure P ₁ is a value determined once the shape and installation position of the inlet pipe in the formula (1), in order to weaken the adsorption upon suction force F is increased inflow pipe pressure P _m There is a need to. In that the inlet pipe pressure P _m can be increased, opposed drainage tube unit of the present invention is to is superior to conventional parallel-type drainage tube unit. This will be described below.

FIG. 14 is an analytical model showing one of the two inflow pipes as a “reference inflow pipe” and the attachment state of the other adsorbed side inflow pipe. For convenience of explanation, the case of the conventional parallel drainage pipe unit and the case of the opposite drainage pipe unit of the present invention are shown in the same diagram. Water flows in from the upper left inflow pipe and turns into a swirl flow along the outer periphery of the vortex chamber. The upper right inflow pipe is the suction side inflow pipe of the opposed drainage pipe unit, and the lower left inflow pipe is the adsorption side inflow pipe of the parallel drainage pipe unit. The adsorbed side inflow pipe is in a state where a part of the flow in the outer periphery of the vortex chamber is blocked, so the pressure in the inflow pipe is a part of the velocity energy of the flow in addition to the pressure energy in the outer periphery of the vortex chamber. Is the sum of those recovered as pressure. That is,
The relationship of inflow pipe pressure = pressure energy at the outer periphery of the vortex chamber + recovery coefficient × flow velocity energy is established. This can be expressed by the following two formulas for the opposing drainage pipe unit of the present invention and the conventional parallel drainage pipe unit.
Where P _{m-1 is the} pressure in the inflow pipe of the opposing drainage pipe unit, P _{m-2 is the} pressure in the inflow pipe of the parallel drainage pipe unit, V ₁ is the flow velocity at the position W, and V _{2 is} Flow velocity at position Z, β: recovery factor (takes a value in the range of 0 to 1.0, but when experimental data was analyzed, it was 0.5), _Po : pressure at the outer periphery of the vortex chamber.

Here, since the Z position is a position rotated by half the circumference along the outer periphery of the vortex chamber from the W position, the velocity of the flow decreases during this time due to friction with the outer peripheral wall. That is,
The relationship will be established.
That is, the term of velocity energy in the equations (2) and (3) is larger in the opposed drainage pipe unit of the present invention, and therefore the pressure in the inflow pipe is larger in the opposed drainage pipe unit. As a result, the suction force at the time of adsorption calculated by the equation (1) is weaker in the opposed drainage pipe unit.

[Reduction mechanism of suction force during adsorption: quantitative evaluation]
Next, the suction force at the time of adsorption of the opposing drainage pipe unit of the present invention and the conventional parallel drainage pipe unit is theoretically analyzed, and quantitative evaluation is performed.

First, the inflow process from the liquid tank to the upper left inflow pipe is analyzed in the analysis model of FIG. If the flow rate Q, the inlet pipe cross-sectional area as A _s, the flow velocity V _S of the inflow tube is given by the following equation.
When the pressure of the liquid tank bottom i.e. inlet pipe inlet and P _1, the total pressure P _st of inflow tube is determined from the following equation.
Here, ρ is the density of water. Ζ is a loss coefficient of the suction pipe. When experimental data is analyzed, it is obtained by the following equation as a function of the Reynolds number Re.
The Reynolds number Re is defined as follows.
Here, _Dv is the vortex chamber diameter and ν is the kinematic viscosity coefficient of water.
The static pressure P _s in the upper left inflow pipe is
More demanded.

The suction side inflow pipe pressure P _m-1 of the opposed drainage pipe unit is obtained by the equation (2) as described above. If equation (2) is reprinted, equation (10) is obtained.
Here, since the flow velocity V ₁ is the flow velocity at the position W as shown in FIG. 14, it may be approximated to be equal to the flow velocity V _S in the upper left inflow pipe. Therefore,
It is. Further, the pressure P _o of the vortex chamber outer peripheral portion can be regarded as equal to the static pressure P _s of the upper left inlet pipe. Therefore,
It is. Since the recovery coefficient is 0.5 as described above, if the equations (11) and (12) are substituted into the equation (10), the suction side inflow pipe pressure P _m-1 of the opposed drainage unit is obtained. be able to. And if P _m-1 is obtained, the suction force F ₁ at the time of adsorption is as shown in the equation (1),
Can be calculated by

Next, the suction-side inflow pipe pressure and suction suction force of the parallel drainage pipe unit are obtained. First, the flow velocity V ₂ of the parallel-type drainage tube unit. Consider the part of the vortex chamber outer peripheral wall shown in FIG. 14 that has been hatched from the W position to the Z position. The flow that has passed through the upper left inlet pipe flows from the tangential direction into the outer periphery of the vortex chamber at the speed V _S at the position W, swirls along the outer peripheral wall by a semicircular circumference, and reaches the position Z. If the boundary layer theory is applied to the swirling flow of the outer peripheral portion where the mesh hatching is applied and the friction of the outer peripheral wall is taken into consideration, the following equation is established from the relation of angular momentum conservation.
Here, r _v is the vortex chamber radius, V _θ is the rotational speed of the outer peripheral portion, and τ _w is the friction stress of the outer peripheral wall. L is the width of the wall surface of the hatched portion in FIG. 5, and can be expressed using the symbols in FIG.
It is.
In order to determine the frictional stress τ _w on the right side of Equation (14), the outer peripheral wall is approximately regarded as a flat plate, and a turbulent boundary layer along the flat plate is considered. Assuming that the velocity distribution of the turbulent boundary layer follows the 1 / 7th law of turbulent flow in a circular pipe, the frictional stress is as follows.
Here, U is the main flow velocity, and δ is the boundary layer thickness. On the other hand, the thickness δ of the boundary layer on the flat plate can be obtained from the following equation where x is the distance from the leading edge.
In FIG. 5, if the turning angle from the position of W is θ, the distance x is x = r _v θ. On the other hand, since the turning angle to the position of Z is θ = π corresponding to half of the circumference, the distance to Z is x = r _v π. Substituting this into equation (17) gives the following.
From the above, assuming that U is the swirl velocity V _θ and τ _w of the outer peripheral portion as the frictional stress of the outer wall of the vortex chamber, Equation (18) is substituted into Equation (16), and this is substituted into Equation (14). And if rewritten as V _θ = V ₂ , the flow velocity V ₂ is
It becomes. Here, μ is the viscosity coefficient of water.
Further, since the pressure P _o of the vortex chamber outer peripheral portion can be regarded as equal to the static pressure P _s of the upper left inlet pipe,
It is.
Since the flow velocity V ₂ and the pressure _Po are now determined, the suction side inflow pipe pressure P _m-2 of the parallel drainage pipe unit is obtained by the equation (3) as described above. Once again,
It becomes.
Therefore, the suction force of the parallel drainage pipe unit during suction is
Can be calculated by

Fig. 15 shows the suction during suction when the inlet pressure P ₁ is 109.53 kPa for a drain tube unit using a thin cylindrical vortex chamber with a vortex chamber diameter of 120 mm and a vortex chamber inner thickness of 13 mm and an inlet pipe with an inner diameter of 13 mm. The force calculation results are shown for both the conventional parallel drainage unit and the opposed drainage unit of the present invention. It can be seen that at the same flow rate in the inflow pipe, the suction type suction pipe unit of the present invention can reduce the suction force during adsorption by about 10 to 15% as compared with the conventional parallel type drainage pipe unit.

  Although the present invention has been described above with reference to specific embodiments, the present invention is not limited to the above-described embodiments, and claims attached to the application of the present application by those skilled in the art or the like. It should be noted that various changes and modifications can be made without departing from the scope of the present invention.

It is a perspective view which shows one Embodiment of the opposing drainage unit of this invention. It is a disassembled perspective view of the opposing drainage pipe unit of FIG. It is a longitudinal cross-sectional view of the opposing drainage pipe unit of FIG. It is the perspective view which illustrated other embodiment of the opposite type drainage unit of the present invention. It is a perspective view for demonstrating 1st embodiment of the circulation type liquid tank apparatus which arrange | positioned the opposing drainage pipe unit of this invention. It is a perspective view for demonstrating 2nd embodiment of the circulation type liquid tank apparatus which arrange | positioned the opposing drainage pipe unit of this invention. It is a perspective view for demonstrating 3rd embodiment of the circulation type liquid tank apparatus which arrange | positioned the opposing drainage pipe unit of this invention. It is a perspective view for demonstrating 4th embodiment of the circulation type liquid tank apparatus which arrange | positioned the opposing drainage pipe unit of this invention. It is the expanded sectional view which looked at the cut surface extended up and down through the A-A 'line in FIG. 8 from the arrow direction. It is a perspective view which shows one Embodiment of the conventional parallel type drainage unit. It is a perspective view for demonstrating 1st embodiment of the circulation type liquid tank apparatus which arrange | positioned the conventional parallel type drainage pipe unit. It is a perspective view for demonstrating 2nd embodiment of the circulation type liquid tank apparatus which arrange | positioned the conventional parallel type drainage pipe unit. It is the perspective view which showed typically the state when a foreign material is adsorbed | sucked to an inflow pipe. It is a figure which shows the analysis model for analyzing the suction | attraction force at the time of adsorption | suction of the opposing drainage pipe unit of this invention, and the conventional parallel drainage pipe unit. It is the graph which compared the attraction | suction power at the time of adsorption | suction of the opposite type drainage unit of this invention, and the conventional parallel type drainage unit.

1 Opposite drainage unit (present invention)
2,8 Vortex chamber
2R Vortex chamber diameter
24 Outlet (outlet)
3a, 3b Inflow pipe
32a, 32b One end side (outlet side)
31a, 31b The other end (inlet side)
41 Discharge tube (water discharge tube)
42 Circulating pump 5 Liquid tank
51 Bottom of liquid tank
53a, 53b Drain outlet
53L Drainage interval 6 Bathtub
62a, 62b Side wall 7 Parallel drainage unit (conventional product)
9a, 9b Inlet pipe

Claims (5)

After discharging the liquid stored in the liquid tank, it is a circulation type liquid tank apparatus configured to return and circulate inside the liquid tank,
A vortex chamber having a circular cross section disposed outside the liquid tank;
One end side is connected to the vortex chamber so that the liquid stored in the liquid tank flows into the vortex chamber, and the other end side is connected to the first drainage port penetrating the liquid tank. A first inlet pipe;
One end side is connected to the vortex chamber so that the liquid stored in the liquid tank flows into the vortex chamber, and the other end side is connected to the second drainage port penetrating the liquid tank. A second inlet pipe,
A spout opening through the central portion of one side of the vortex chamber in the axial direction;
A circulation pump connected to the spout,
The first inflow pipe and the second inflow pipe are linearly opposed from the left and right in the tangential direction at a predetermined position of the inner peripheral portion of the vortex chamber, and one end side thereof is connected to the vortex chamber. Circulating liquid tank device. The circulating liquid tank apparatus according to claim 1, wherein the first liquid discharge port and the second liquid discharge port are pierced into the liquid tank with an interval equal to or larger than the inner diameter of the vortex chamber having a circular cross section. The circulation type liquid tank apparatus according to claim 1 , wherein the vortex chamber is arranged vertically outside the liquid tank. The circulation type liquid tank apparatus according to claim 1 or 2 , wherein the vortex chamber is disposed laterally outside the liquid tank. The circulation type liquid tank apparatus according to any one of claims 1 to 4 , wherein the vortex chamber and the circulation pump are integrally formed by integrally forming the vortex chamber casing and the circulation pump casing.