JP3247207U - Check valves and portable toilets - Google Patents

Abstract

[Problem] To provide a check valve capable of suppressing the backflow of odors generated from liquid. [Solution] A check valve 1 comprises a substantially cylindrical inlet 10 for receiving liquid, a water collection section 20 provided downstream of the inlet 10, in which the flow path of the liquid narrows from the inlet 10 toward the downstream side, and an on-off valve section 30 provided downstream of the water collection section 20, which expands and opens when liquid passes through to discharge the liquid from an outlet 30b, and closes otherwise to prevent the liquid from passing through, the on-off valve section 30 having at least two bent sections 33, 34 that bend the discharge path of the liquid between the downstream side of the water collection section 20 and the outlet 30b, and the outlet 30b is formed only on the bottom surface portion on the downstream side. [Selected Figure] Figure 1

Description

This invention relates to a check valve and a portable toilet equipped with the same.

Temporary portable toilets have traditionally been used at construction sites, event venues, disaster evacuation shelters, and the like. Most of these types of portable toilets consist of a toilet bowl that receives urine from users and a tank that stores the urine received in the toilet bowl (see, for example, Patent Documents 1 and 2).

JP 2015-228993 A Patent No. 5727662

In portable toilets, if urine is left in the tank for a long time, bacteria will grow and cause odors. This odor will backflow from the tank into the opening of the toilet bowl (the water collection area), which is not only unpleasant for users but also unsanitary. For this reason, it is desirable to replace the tank before odors begin to occur. However, depending on the environment in which the portable toilet is installed (for example, a construction site for a high-rise building), it may not be possible to replace the tank frequently. For this reason, it is necessary to suppress the backflow of odors. Note that this issue is not limited to urine, but is a common issue in systems that collect and store odorous liquids such as sewage in a tank.

The purpose of this invention is to provide a check valve and a portable toilet that can prevent the backflow of odors generated from liquids.

The check valve of the present invention comprises a substantially cylindrical inlet portion for receiving liquid, a water collection portion provided downstream of the inlet portion and in which the flow path of the liquid narrows from the inlet portion downstream, and an on-off valve portion provided downstream of the water collection portion and discharging the liquid from an outlet by expanding and opening when liquid passes through, and closing at all other times to prevent liquid from passing through, the on-off valve portion having at least two bent portions that bend the discharge path of the liquid between the downstream side of the water collection portion to the outlet, and the outlet is formed only in the bottom portion on the downstream side.
The portable toilet of the present invention comprises the above-mentioned check valve, a toilet bowl that discharges urination as a liquid downstream from an opening, and a tank that takes in and stores the urination discharged from the toilet bowl through a water intake section, and the check valve is positioned between the opening of the toilet bowl and the water intake section of the tank so that the introduction section is upstream.

The check valve and portable toilet of this invention can prevent the backflow of odors generated from liquids.

FIG. 1 is a perspective view of a check valve 1 according to an embodiment. 2 is a cross-sectional view of the check valve 1 shown in FIG. 1 cut along a YZ plane. 2 is a side view of the check valve 1 shown in FIG. 1 as viewed from the Z1 direction. FIG. 2 is a cross-sectional view showing the check valve 1 in an open state. FIG. 2 is a cross-sectional view showing the check valve 1 in a closed state. FIG. 1 is a front view of the portable toilet 100. FIG. 1 is a perspective view of the portable toilet 100 with the door open. FIG. 1 is a perspective view of a portable toilet 100 with the door and other parts closed. A front view of the toilet body 300. FIG. 3 is a plan view of the toilet bowl 310. FIG. 2 is a left side view of the toilet body 300. FIG. 2 is a perspective view of the toilet body 300.

Below, an embodiment of the check valve and portable toilet according to the present invention will be described. All drawings attached to this specification are schematic diagrams, and the shape, scale, aspect ratio, etc. of each part have been modified or exaggerated from the actual product in consideration of ease of understanding, etc. The use of the check valve according to the present invention is not particularly limited, but in this embodiment, an example in which the check valve is applied to a portable toilet will be described.

In this specification, the left-right direction when looking at the check valve 1 from the orientation shown in Figure 1 is described as the X (X1-X2) direction, the up-down direction is the Y (Y1-Y2) direction, and the front-back direction is the Z (Z1-Z2) direction. Note that the left-right direction X and the front-back direction Z shown in Figure 1 are directions added for ease of explanation and understanding, and are not uniquely specified in the manner in which the check valve 1 is used. Also, in this specification, "~ direction" is also referred to as "~ side" as appropriate. Furthermore, in this specification, the upstream side and downstream side in the direction in which urine naturally falls under its own weight are also referred to as the upstream side Y1 and downstream side Y2, using the notation of the up-down direction Y.

(non-return valve)
Fig. 1 is a perspective view of a check valve 1 according to an embodiment. Fig. 2 is a cross-sectional view of the check valve 1 shown in Fig. 1 cut along a YZ plane. Fig. 3 is a side view of the check valve 1 shown in Fig. 1 as viewed from a Z1 direction.

As shown in FIG. 1, the check valve 1 of the embodiment includes an inlet portion 10, a water collection portion 20, and an on-off valve portion 30. In the embodiment, the inlet portion 10, the water collection portion 20, and the on-off valve portion 30 constituting the check valve 1 are integrally formed from the same material, which will be described later. The check valve 1 is formed from an elastic material, such as rubber or silicone.

The introduction section 10 is a section that receives urine (liquid) excreted by the user and allows the urine to flow into the downstream water collection section 20 (described later). The introduction section 10 is provided on the uppermost side Y1 of the check valve 1. As shown in FIG. 2, the introduction section 10 includes a main body section 11 and a flange 12. The main body section 11 is a section formed in a substantially cylindrical shape. The flange 12 is provided on the end of the upper side Y1 of the main body section 11. The flange 12 is a member for suppressing misalignment of the check valve 1 attached to the opening 311 (see FIG. 9) of the toilet bowl 310. The flange 12 is formed in a substantially ring shape. As described later, the outer diameters of the main body section 11 and the flange 12 are set to match the inner diameter of the opening 311.

The water collection section 20 is a section that temporarily stores the urine that flows in from the introduction section 10 and allows the stored urine to flow into the downstream opening and closing valve section 30 (described later). The water collection section 20 is provided on the downstream side Y2 of the introduction section 10. The upper side Y1 of the water collection section 20 is connected to the lower side Y2 of the introduction section 10. As shown in FIG. 2, the inside of the water collection section 20 is inclined so that the flow path of the urine narrows from the introduction section 10 toward the downstream side Y2. In other words, the downstream side Y2 of the water collection section 20 is formed to have a tapered shape. Note that the shape of the water collection section 20 is not limited to the shape shown in the figure, as long as it has a shape that can function equally well. The shape of the water collection section 20 may be, for example, a cone that is wide on the upper side and tapered on the lower side.

The on-off valve section 30 is a section that discharges the urine that has flowed in from the water collection section 20 from the downstream side Y2. The on-off valve section 30 is provided on the downstream side Y2 of the water collection section 20. The upper side Y1 of the on-off valve section 30 is connected to the lower side Y2 of the water collection section 20. As shown in FIG. 2, the on-off valve section 30 has a first side portion 31 and a second side portion 32. The first side portion 31 and the second side portion 32 are each formed in a sheet shape and are stacked in the thickness direction. In addition, the first side portion 31 and the second side portion 32 are biased in the direction of contact with each other due to the tapered shape of the downstream side Y2 of the water collection section 20. Therefore, the on-off valve section 30 maintains the closed state as shown in FIG. 2 unless the pressure of the urine is applied.

As shown in FIG. 3, the first side portion 31 and the second side portion 32 are joined at both side edges in the left-right direction (width direction) X. The on-off valve portion 30 has an outlet 30b formed only on the bottom surface portion of the lower side Y2. In other words, the on-off valve portion 30 does not have any cuts or the like formed on both ends in the left-right direction (width direction) X on the bottom surface portion of the lower side Y2. In this way, the on-off valve portion 30 is configured in a roughly envelope-like shape so that urine can pass from the upstream side Y1 to the downstream side Y2 and can be discharged from the outlet 30b.

As described later, the pressure of the urine collected in the water collection section 20 falling under its own weight pushes the first side portion 31 and the second side portion 32 apart against their own elasticity, and the valve section 30 is in an open state. This opens the discharge path 30a of the valve section 30, and the urine can be discharged from the discharge port 30b on the downstream side Y2. When the pressure of the urine is no longer applied to the valve section 30, the first side portion 31 and the second side portion 32 are urged in a direction to contact each other by their own elasticity, and the valve section 30 is in a closed state. This closes the discharge path 30a of the valve section 30, and the backflow of urine, odor, etc. is suppressed. Note that FIG. 2 shows the discharge path 30a of the valve section 30 in a closed state.

2, the on-off valve unit 30 includes a first bent portion 33 and a second bent portion 34 (hereinafter, collectively referred to as "bent portion") between the downstream side Y2 of the water collection unit 20 and the discharge outlet 30b. The bent portion is a portion that bends the water collection unit 20 from the downstream side Y2 to the discharge outlet 30b. In the side view shown in FIG. 2, the angle θ between the flat portions 30c and 30d located above and below the first bent portion 33 is set to be an obtuse angle. The same is true for the second bent portion 34, and although not shown, the angle θ between the two flat portions located above and below the second bent portion 34 is set to be an obtuse angle. Also, as shown in FIG. 2, the first bent portion 33 and the second bent portion 34 are bent in different directions.

Next, the opening and closing operation of the check valve 1 configured as described above will be described. Figure 4A is a cross-sectional view showing the check valve 1 in an open state. Figure 4B is a cross-sectional view showing the check valve 1 in a closed state. Both Figures 4A and 4B are cross-sectional views equivalent to Figure 2.

As shown in FIG. 4A, when the urination P received at the introduction section 10 starts to accumulate in the water collection section 20, the pressure of the urination P falling under its own weight pushes the first side section 31 and the second side section 32 of the opening/closing valve section 30 apart against their own elasticity, opening the valve section 30. That is, as shown in FIG. 4A, the pressure of the urination P falling under its own weight causes the first side section 31 and the second side section 32 to expand in the direction of the arrow (solid line), opening the discharge path 30a of the opening/closing valve section 30. As a result, the urination P accumulated in the water collection section 20 flows through the discharge path 30a and is discharged from the discharge port 30b on the downstream side Y2.

On the other hand, as shown in FIG. 4B, when the urine P stored in the water collection section 20 is gone, the pressure caused by the weight of the urine P falling is no longer applied to the opening/closing valve section 30, so the first side section 31 and the second side section 32 are urged in the direction of contact with each other by their own elastic force and are in a closed state. That is, as shown in FIG. 4B, when the pressure caused by the weight of the urine P falling is no longer applied, the first side section 31 and the second side section 32 are urged in the direction of the arrow (broken line), so the discharge path 30a of the opening/closing valve section 30 is in a closed state. This suppresses backflow from the discharge port 30b of the urine P and odors discharged downstream.

According to the check valve 1 of this embodiment configured as described above, for example, the following effects are obtained.
In the check valve 1 of this embodiment, the discharge path 30a is opened by the free fall of the urine (liquid) accumulated in the water collection section 20, so the discharge of the urine from the discharge port 30b is not hindered. Therefore, the check valve 1 can smoothly discharge the urine accumulated in the water collection section 20 to the downstream side Y2 (see FIG. 4A). In addition, the check valve 1 closes the discharge path 30a when the urine accumulated in the water collection section 20 disappears (see FIG. 4B). In addition, when the opening/closing valve section 30 is closed, the two bends make the discharge path 30a more obstructive (compared to when there is no bend or when there is only one bend). Therefore, the check valve 1 of this embodiment can suppress the backflow of the urine, odor, etc. discharged to the downstream side.

In the check valve 1 of this embodiment, the two bent portions are bent at an obtuse angle (see FIG. 2). This allows the check valve 1 to reduce the flow resistance of urinary fluid passing through the discharge path 30a of the on-off valve unit 30 compared to a configuration in which the two bent portions are bent at an acute angle. Therefore, in the check valve 1 of this embodiment, urinary fluid can be discharged more quickly from the discharge path 30a of the on-off valve unit 30.

In the check valve 1 of this embodiment, the two bent portions are bent in different directions (see FIG. 2). This allows the outlet 30b to be directed further downward in the Y2 direction than when the two bent portions are bent in the same direction. Therefore, in the check valve 1 of this embodiment, urine can be prevented from accumulating in the outlet path 30a of the opening/closing valve portion 30.

(Portable toilet)
Next, a description will be given of the configuration of the portable toilet 100 including the above-described check valve 1. The portable toilet 100 described in this embodiment is a temporary portable toilet installed, for example, at a construction site, an event venue, a disaster evacuation shelter, or the like.

Figure 5 is a front view of the portable toilet 100. Figure 6 is a perspective view of the portable toilet 100 with the door open. Figure 7 is a perspective view of the portable toilet 100 with the door closed. In each figure, the reference numerals of hinges, connecting members, retaining members, etc. that connect members together are omitted as appropriate (the same applies to Figures 8 to 11 described below).

In this specification, the left-right direction when viewing the portable toilet 100 from the orientation shown in Figure 5 is described as the x (x1-x2) direction, the up-down direction is the y (y1-y2) direction, and the front-rear direction is the z (z1-z2) direction. Here, to distinguish from the XYZ directions of the check valve 1, the directions are described as lowercase xyz directions.

As shown in FIG. 5 , the portable toilet 100 includes an exterior part 200 and a toilet main body part 300 .
First, the exterior part 200 will be described. The exterior part 200 is a structure that covers the entire outside of the portable toilet 100. As shown in Fig. 6, the exterior part 200 includes a cart 201, a top plate 202, a left side plate 203, a right side plate 204, a back plate 205, a left door 206, a right door 207, a partition plate 208, and the like. Of these, the left side plate 203, the right side plate 204, the back plate 205, the left door 206, and the right door 207 are respectively disposed on the four lateral surfaces of the portable toilet 100.

The dolly 201 is a member disposed on the underside y2 of the exterior part 200. The toilet main body part 300 (described later) is provided on the upper side y1 of the dolly 201. Casters 201a are disposed on the four corners of the underside y2 of the dolly 201. The casters 201a are, for example, free-wheeling casters in which the swivel shaft and the wheel rotation shaft are disposed eccentrically. Note that in the exterior part 200, a bottom plate with legs may be disposed instead of the dolly 201 with casters. The ends of the underside y2 of the left side plate 203, right side plate 204, and back plate 205 are attached to the dolly 201.

The top plate 202 is a plate-like member disposed on the upper side y1 of the exterior part 200. The top plate 202 is attached to the side edge of the upper side y1 of the back plate 205 (described later) so as to be freely opened and closed. Figure 6 shows the exterior part 200 with the top plate 202 in the most open state.

The left side plate 203 is a plate-like member arranged on the left side x1 of the trolley 201. The right side plate 204 is a plate-like member arranged on the right side x2 of the trolley 201. The back plate 205 is a plate-like member arranged on the rear side z2 of the trolley 201. The left side plate 203, right side plate 204 and back plate 205 are arranged in a generally concave shape in a plan view so as to cover the left side x1, right side x2 and rear side z2 of the trolley 201. The left side plate 203, right side plate 204 and back plate 205 are each fixed to the trolley 201 at the end on the lower side y2.

The left door 206 is a plate-like member for covering the left half of the front side z1 of the exterior part 200. The left door 206 is attached to the side edge of the front side z1 of the left side plate 203 so as to be freely opened and closed. The right door 207 is a plate-like member for covering the right half of the front side z1 of the exterior part 200. The right door 207 is attached to the side edge of the front side z1 of the right side plate 204 so as to be freely opened and closed. FIG. 6 shows the left door 206 and the right door 207 in the most open state. The partition plate 208 is a plate-like member disposed between the toilet bowl 310 and the tank 320 (described later). As shown in FIG. 5, the partition plate 208 is detachably provided between the support member 203a provided on the left side plate 203 and the support member 204a provided on the right side plate 204.

As shown in FIG. 7, the interior of the portable toilet 100 can be easily sealed by closing the top plate 202, the left door 206, and the right door 207 of the exterior part 200. Also, as described above, the portable toilet 100 is provided with casters 201a on the cart 201. Therefore, in the state shown in FIG. 7, the manager can move the portable toilet 100 to a desired location by pushing or pulling the portable toilet 100 from the outside.

Next, the toilet body 300 will be described. Fig. 8 is a front view of the toilet body 300. Fig. 9 is a plan view of the toilet bowl 310. Fig. 10 is a left side view of the toilet body 300. Fig. 11 is a perspective view of the toilet body 300. Figs. 8, 10, and 11 show the toilet body 300 installed on the cart 201 (exterior part 200).

As shown in FIG. 8, the toilet body 300 includes a toilet bowl 310, a tank 320, a connecting portion 330, and the like.
The toilet 310 is a bowl-shaped device that collects urine discharged by a user and discharges it downstream from an opening 311 (described later). As shown in FIG. 9, the toilet 310 has an opening 311 at approximately the center of the portion that receives the urine. The opening 311 is a portion that discharges the urine downstream. The check valve 1 (see FIG. 1) is installed, for example, in the opening 311 of the toilet 310. When the check valve 1 is installed in the opening 311 of the toilet 310, the outer diameter of the main body 11 is set to be the same as or slightly smaller than the inner diameter φ of the opening 311. In addition, the outer diameter of the flange 12 is set to be larger than the inner diameter φ of the opening 311. As shown in FIG. 10, a discharge portion 312 that is connected to a connecting portion 330 (described later) is provided on the opposite side y2 of the opening 311.

The tank 320 is a container that stores urination discharged from the toilet bowl 310. As shown in FIG. 8, the tank 320 is installed on the cart 201. The tank 320 has a water intake section 321 on its upper surface (the upper side y1 surface). The water intake section 321 is an opening that is connected to the connecting section 330. The urination discharged from the toilet bowl 310 flows through the connecting section 330 and is then taken into the tank 320 from the water intake section 321. In the toilet body 300 of this embodiment, two tanks 320 are installed in the left-right direction x.

In the following description, the tank installed on the left side x1 will also be referred to as "tank 320L". The tank installed on the right side x2 will also be referred to as "tank 320R". When there is no need to distinguish between the left and right tanks, they will be collectively referred to as "tank 320". A handle for holding the tank 320 may be provided on the top surface of the tank 320. By providing a handle on the top surface of the tank 320, the administrator can easily remove and install the tank 320.

The connecting part 330 is a part for introducing urination discharged from the toilet 310 into the tank 320. The connecting part 330 includes hoses 331-333 and a joint 334. The hoses 331-333 are, for example, flexible bellows hoses. The joint 334 is a T-shaped joint that connects to the hoses 331-333. As shown in FIG. 10, the upstream end of the hose 331 is connected to the discharge part 312 of the toilet 310. The downstream end of the hose 331 is connected to the inlet port 334a of the joint 334.

As shown in FIG. 8, the upstream end of the hose 332 is connected to the outlet port 334b of the joint 334. The downstream end of the hose 332 is connected to the water intake section 321 of the tank 320L (left side x1). On the other hand, the upstream end of the hose 333 is connected to the outlet port 334c of the joint 334. The downstream end of the hose 333 is connected to the water intake section 321 of the tank 320R (right side x2).

As described above, the partition plate 208 of the exterior part 200 is detachably provided between the toilet bowl 310 and the tank 320. As shown in FIG. 11, the partition plate 208 has a generally U-shaped recess 208a. The recess 208a is a cutout to prevent the partition plate 208 from interfering with the hose of the connecting part 330. When the toilet bowl 310, the tank 320 and the connecting part 330 are connected, the partition plate 208 can be attached to the exterior part 200 without interfering with the connecting part 330 by inserting the partition plate 208 from the front side z1 to the rear side z2 of the toilet body part 300. As a result, the partition plate 208 is bridged between the support member 203a of the left side plate 203 and the support member 204a of the right side plate 204 as shown in FIG. 5.

The urine discharged from the toilet 310 is sent from the discharge part 312 of the toilet 310 to the joint 334 via the hose 331. A part of the urine sent to the joint 334 is sent from the outlet side port 334b of the joint 334 via the hose 332 to the tank 320L. The urine sent to the tank 320L is introduced into the tank from the water intake part 321 of the tank 320L. The remainder of the urine sent to the joint 334 is sent from the outlet side port 334c of the joint 334 to the tank 320R via the hose 333. The urine sent to the tank 320R is introduced into the tank from the water intake part 321 of the tank 320R.

The portable toilet 100 of this embodiment is equipped with an exterior part 200 that covers the entire outside of the toilet body part 300, so that by closing the top plate 202, left door 206, and right door 207 of the exterior part 200, it is possible to prevent dirt, dust, etc. from adhering to the toilet bowl 310 and tank 320 when not in use. In addition, since the toilet body part 300 (see FIG. 1) installed inside the portable toilet 100 can be covered, the aesthetic appearance is not impaired when not in use.

The portable toilet 100 has a partition 208 (see FIG. 5) between the toilet bowl 310 and the tank 320. This prevents urine that is not received by the toilet bowl 310 from adhering to the tank 320. In addition, users can temporarily place luggage, items, etc. on the partition 208. The partition 208 is removable, so it can be removed for cleaning.

The tank 320 of the portable toilet 100 is installed on the cart 201. Therefore, the manager can easily remove and install the tank 320 by opening the left and right doors of the exterior part 200.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and various modifications and variations are possible, such as the modified forms described below, which are also included within the technical scope of the present invention. Furthermore, the effects described in the embodiment are merely a list of the most favorable effects resulting from the present invention, and are not limited to those described in the embodiment. The above-mentioned embodiment and the modified forms described below can also be used in appropriate combination, but detailed explanations will be omitted.

(Modifications)
In the embodiment, an example in which the on-off valve unit 30 is provided with two bent portions has been described, but the present invention is not limited to this. The on-off valve unit 30 may be configured to have three or more bent portions. That is, the on-off valve unit 30 only needs to have a plurality of bent portions. The angles at which the plurality of bent portions are bent may be the same or different. The intervals between the plurality of bent portions are also not limited to the example of the embodiment. It is desirable that the angle at which the bent portion is bent is an obtuse angle as in the embodiment, but it may be an acute angle as long as it is an angle close to 90 degrees.

In the embodiment, an example in which the check valve 1 is attached to the opening 311 of the toilet 310 has been described, but this is not limiting. The check valve 1 may be attached to the water intake section 321 of the tank 320, or to the connecting section 330. The check valve 1 may also be attached to multiple locations. For example, the check valve 1 may be attached to two locations: the opening 311 of the toilet 310 and the water intake section 321 of the tank 320.

In the embodiment, an example has been described in which each part constituting the check valve 1 (the inlet part 10, the water collection part 20, and the on-off valve part 30) is integrally formed from the same material, but this is not limited to this. The check valve 1 may also be configured such that each part formed as a separate part is joined to each other. In addition, each part constituting the check valve 1 may be formed from a different material.

In the embodiment, an example has been described in which the exterior part 200 of the portable toilet 100 covers the entire outside of the toilet body part 300, but this is not limited to the above. The configuration of the exterior part 200 may be appropriately simplified. For example, the configuration may not include the top plate 202, the left door 206, the right door 207, etc. Also, the portable toilet 100 may be configured with only the toilet body part 300 without including the exterior part 200.

In the embodiment, an example in which two tanks 320 are provided has been described, but this is not limiting. There may be one tank 320, or three or more tanks 320. In a configuration in which multiple tanks 320 are provided, one may be used as a main tank and the others as spare tanks. For example, in the configuration of the embodiment, the joint may be configured as a three-way valve that can switch the flow path, and tank 320L may be used as the main tank and tank 320R as the spare tank.

In the embodiment, an example has been described in which the hoses 331 to 333 constituting the connecting portion 330 are made of flexible bellows hoses, but this is not limiting. Instead of the bellows hoses, for example, polyvinyl chloride pipes or metal pipes may be used.

1: Check valve 10: Introduction section 20: Water collection section 30: Opening and closing valve section 30a: Discharge path 30b: Drain outlet 33: First bent section 34: Second bent section 100: Portable toilet 200: Exterior section 310: Toilet bowl 320: Tank 330: Connection section

Claims (4)

A generally cylindrical introduction portion for receiving liquid;
a water collecting section provided downstream of the inlet section, the flow path of the liquid narrowing from the inlet section toward the downstream side;
an on-off valve section that is provided downstream of the water collecting section and that expands and opens when liquid passes through to discharge the liquid from a discharge port and closes otherwise to prevent the liquid from passing through;
Equipped with
The on-off valve unit has at least two bent portions that bend a liquid discharge path between the downstream side of the water collecting unit and the discharge outlet, and the discharge outlet is formed only in a bottom surface portion on the downstream side.
non-return valve. In the on-off valve portion, the bent portion is bent at an obtuse angle.
The check valve according to claim 1 . The on-off valve portion has a first bent portion and a second bent portion between the water collecting portion and the discharge port, and the first bent portion and the second bent portion are bent in different directions from each other.
The check valve according to claim 1 or 2. A check valve according to claim 1;
A toilet bowl that discharges liquid urine from an opening downstream;
A tank that takes in urine discharged from the toilet bowl through a water intake section and stores it;
Equipped with
The check valve is provided between the opening of the toilet bowl and the water intake of the tank, with the introduction portion being located upstream.
Simple toilet.

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