JP7750464B2 - drain trap - Google Patents

Description

The present invention relates to a drain trap that can be attached to a pipe.

Tubs such as washbasins, sinks, and bathtubs discharge wastewater generated during use downstream through piping.

A drain trap is a component that is attached to the above-mentioned piping; it stores wastewater discharged from equipment inside and forms a water seal to prevent odors and pests from flowing back from downstream.

Japanese Patent Application Laid-Open No. 2008-002217

The drain trap described above has uneven surfaces on the top, which causes air to become trapped in the uneven surfaces when a large amount of wastewater is discharged at once, reducing the drainage flow rate. Furthermore, the uneven surfaces can trap hair, soap, and other dirt in the drainage, making it unsanitary.

If the tub to which the drain trap is attached is a washbasin or sink, the drain trap may be placed in the storage space of the cabinet on which the tub is placed, or if the tub is a bathtub, the drain trap may be placed in the space under the floor.
Therefore, in storage spaces, it is desirable to miniaturize drain traps to maximize the use of storage space, and in underfloor spaces, where the space is already narrow, it is also desirable to miniaturize drain traps. However, the drain traps are required to have a water seal depth of at least a certain level to maintain a water seal when positive or negative pressure occurs in the piping. Therefore, in order to miniaturize the drain trap while maintaining a water seal depth, it is possible to narrow the width between the odor prevention wall and the bottom of the drain trap, or to narrow the width between the upper end of the storage section and the top of the drain trap. However, in this case, there are problems such as a decrease in the drain flow rate due to the narrowed flow path, and dirt easily accumulating in the narrowed flow path.

Note that the water seal depth refers to the depth between the bottom of the odor-proof wall and the top of the storage section, and it is generally desirable for the water seal depth to be 50 mm or more.

Therefore, an object of the present invention is to solve the following problems in drain traps.
1. Prevents a decrease in drainage flow rate due to air stagnation. 2. Prevents dirt from adhering. 3. Reduces the size of the drain trap.

To solve the above problems, the present invention provides a trap body that forms a water seal therein;
an inlet formed in an upper portion of the trap body;
a discharge port formed on a side surface of the trap body,
the upper portion has an inclined surface that rises toward the outlet,
the trap body has a side surface facing the discharge port,
The drain trap is characterized in that the inclined surface is an end portion having a base end at or near the side surface of the trap body facing the discharge port .

Furthermore, the inclined surface continues toward the discharge port,
It is characterized by discharging air from the flow path when draining water.

It is preferable that the inclined surface continue smoothly and without any irregularities toward the discharge port, but the entire upper portion does not need to be an inclined surface like this. In other words, even if the upper portion has irregularities that protrude toward the inside of the trap body, it is sufficient that a smooth inclined surface is formed that discharges air in the flow path by bypassing the irregularities.

Furthermore, a vertical pipe is inserted into the inlet,
connected by a connecting member,
The upper end of the outlet is located above the lower end of the connecting member.

Furthermore, a storage section in which wastewater is stored;
The odor preventing wall has a lower end disposed within the storage section.

This invention makes it possible to prevent a decrease in drainage flow rate due to air accumulating inside the drain trap. It also makes it possible to prevent dirt from adhering to the drain trap and to make the drain trap more compact.

FIG. 2 is a cross-sectional view showing the installation state of the drain trap according to the first embodiment. FIG. 2 is a cross-sectional view showing the drain trap according to the first embodiment. FIG. 2 is a side view showing the drain trap according to the first embodiment. FIG. 4 is a reference diagram showing the flow of drainage in the drain trap according to the first embodiment. A cross-sectional view showing the installation state of the drain trap related to the second embodiment.

A first embodiment of the drain trap of the present invention will be described below with reference to FIGS. 1 to 4. FIG.
The drain trap 5 according to the first embodiment is attached to a pipe continuing from the drain outlet 2 of the tub body 1, which is a washbasin.

As shown in Figure 1, the tank body 1 is concave and open at the top, and has a drain outlet 2 formed on the bottom, to which a vertical pipe 3 extending downward is connected. The tank body 1 is placed on a cabinet C, and wastewater flowing into the drain outlet 2 is discharged through the vertical pipe 3, drain trap 5, and bent pipe 6 into the underfloor pipe.
The cabinet C has a storage space therein in which everyday items (not shown) are stored.

The vertical pipe 3 is a cylindrical pipe that continues from the drain outlet 2, and its lower end is inserted into the drain trap 5. The vertical pipe 3 is connected to the drain trap 5 by threading the connecting member, nut 4, into the drain trap 5 via a gasket 41. The end of the inserted vertical pipe 3 is located inside the odor-proof wall 57.

2 and 3, the drain trap 5 includes a trap body 51, an inlet 56, an odor prevention wall 57, a storage section 58, and an outlet 59. The inlet 56 is connected to the vertical pipe 3, and the outlet 59 is connected to the bent pipe 6.
The trap body 51 is a casing that forms a water seal inside, and an inlet 56 is formed in the upper part 52, through which wastewater flows in from the tank body 1. In addition, an outlet 59 is formed in the downstream side surface 55a of the trap body 51.
The inclined surface 53 is formed on the upper portion 52 and is an inclined portion that smoothly rises toward the discharge port 59, with no irregularities formed on the inclined surface 53 that protrude toward the inside of the trap body 51. In the first embodiment, the end 54, which is the base end of the inclined surface 53, is located near the side surface 55b of the trap body 51 that faces the discharge port 59. Therefore, the inclined surface 53 begins to slope from an end closer to the side surface 55b that faces the discharge port 59 than the outer edge 561 of the inlet 56 on the discharge port 59 side, and the upper portion 52 always rises relative to the bottom surface of the trap body 51 as it approaches the discharge port 59.
The inlet 56 is the upstream end of the drain trap 5, and the vertical pipe 3 can be inserted into it. A male thread is formed on the outer periphery of the inlet 56, and is threaded onto the nut 4 via a packing 41.
The odor prevention wall 57 is a cylindrical wall surface that continues from the inlet 56 and extends toward the bottom surface of the trap body 51. The lower end of the odor prevention wall 57 is located lower than the upper end of the outlet 59. Therefore, the lower end of the odor prevention wall 57 is disposed within the storage section 58, and is located lower than the water surface of the stored wastewater when the wastewater is stored.
The storage section 58 is a bowl-shaped section formed at the bottom of the trap body 51 to store wastewater, and the bottom surface on the downstream side is bent upward to raise the drainage flow path toward the discharge port 59.
The outlet 59 is an opening formed in a substantially horizontal direction so as to discharge wastewater that overflows from the storage section 58, and a male screw that screws onto the nut 4 is threaded on the outer periphery of the outlet 59. The outlet 59 is expanded so that its inner diameter is substantially the same as the outer diameter of the bent pipe 6, so that when the bent pipe 6 is inserted, the bent pipe 6 does not protrude into the trap body 51. The upper end of the outlet 59 is located above the lower end of the nut 4, which is the connecting member.

The bent pipe 6 is a pipe that is roughly L-shaped in cross section, and drains wastewater that flows in from a roughly horizontal direction by changing direction to a vertical direction. The lower end of the bent pipe 6 is connected to underfloor piping (not shown). The drain trap 5 of the present invention does not have to be connected only to the bent pipe 6, but may also be connected to a straight pipe or a flexible bellows pipe.

The drain trap 5 stores the wastewater flowing in from the drain outlet 2 in the storage section 58. The lower end of the odor-proof wall 57 is positioned below the surface of the stored wastewater. As a result, the drain trap 5 fills part of the drainage flow path with water, thereby performing a trapping function that prevents odors from flowing back from downstream and pests from entering the home.

The flow of wastewater that flows into the drain trap 5 is explained below. Note that in Figure 4, the wastewater flowing through the flow path is hatched to make it easier to understand the invention.

The hot water in the tank body 1 is discharged as wastewater from the drain outlet 2 together with dirt such as hair and soap. The wastewater passes through the vertical pipe 3, flows into the drain trap 5 from the inlet 56, and flows down toward the bottom of the trap body 51.
Next, the wastewater that hits the bottom surface of the trap body 51 changes direction, moves up the flow path toward the back side of the trap body 51 , and is discharged from the discharge port 59 into the bent pipe 6 .

When a large amount of water is drained from the tank body 1, the water reaches the upper part 52 of the trap body 51. If air remains in the trap body 51 at this time, the drain flow rate of the drain trap 5 decreases. However, in the present invention, the upper part 52 rises toward the outlet 59, and a smoothly continuous slope 53 is formed toward the outlet 59. As shown by the arrow in Figure 4(a), during drainage, the air inside the trap body 51 moves along the slope 53 toward the back and is discharged from the outlet 59. This allows the trap body 51 to be filled with water, as shown in Figure 4(b), preventing a decrease in the drain flow rate. Furthermore, since dirt being drained is also discharged from the outlet 59, accumulation of dirt within the trap body 51 can be prevented.

When drainage from the tank body 1 is complete, the drain trap 5 stores the wastewater in the storage section 58 and fills part of the flow path with the stored wastewater, forming a water seal and performing a trap function that prevents odors from flowing back from downstream and pests from entering the home.

In the drain trap 5, the upper portion 52 has a slope 53 that continues smoothly and without irregularities toward the discharge port 59. This allows air in the flow path to be smoothly discharged when draining, and also makes it possible to prevent hair and the like from accumulating inside the trap body 51 while draining.
Furthermore, since the drain trap 5 has the inclined surface 53, it is possible to ensure a flow path between the storage section 58 and the upper section 52 even when the drain trap 5 is made smaller. Therefore, it is possible to make the drain trap 5 smaller, and to prevent a decrease in the drain flow rate and adhesion of dirt.
In the first embodiment, the drain trap 5 is made smaller by positioning the upper end of the outlet 59 higher than the lower end of the nut 4, which is the connecting member, but the upper part 52 is connected to the outlet 59 by a smoothly rising inclined surface 53, so the inclined surface 53 and the outlet 59 do not interfere with the nut 4. Therefore, even if the drain trap 5 is made smaller, workability does not decrease.
Furthermore, the end 54 of the inclined surface 53 is located near the side surface 55b of the trap body 51. This makes it possible to reduce the inclination angle of the inclined surface 53, allowing air to be smoothly discharged from the flow path when draining, and effectively preventing the accumulation of hair, etc. Note that the position of the end 54 of the inclined surface 53 is not particularly limited, but it is desirable that it be closer to the side surface 55b than the outer edge 561 of the inlet 56 on the outlet 59 side.

The first embodiment of the present invention has been described above, but the present invention is not limited to the shape of the first embodiment. For example, the tank body in the first embodiment is a washbasin, but the tank body 1 may be a bathtub as in the second embodiment shown in Figure 5. Furthermore, the tank body may be a sink or other tank body.
Furthermore, in the first embodiment, no irregularities protruding toward the inside of the trap body 51 were formed on the inclined surface 53, but irregularities may be formed as long as they do not hinder the discharge of air from the flow path during drainage. In other words, even if irregularities protruding toward the inside of the trap body 51 are formed on the upper part, it is sufficient to form a smooth inclined surface 53 that allows the discharge of air from the flow path to bypass the irregularities.

DESCRIPTION OF SYMBOLS 1 Tank body 2 Drain outlet 3 Vertical pipe 4 Nut 41 Gasket 5 Drain trap 51 Trap body 52 Upper part 53 Inclined surface 54 Ends 55a, 55b Side surface 56 Inlet 561 Outer edge 57 Odor prevention wall 58 Storage section 59 Outlet 6 Bent pipe C Cabinet

Claims (2)

a trap body including a casing having a storage section for storing wastewater therein, the trap body forming a water seal therein by the wastewater stored in the storage section ;
an inlet formed in an upper portion of the trap body for allowing the wastewater to flow into the storage portion ;
a nut-shaped connecting member that screws onto the inlet;
An odor prevention wall consisting of a cylindrical wall surface that is continuous with the inlet and has a lower end that is disposed within the storage section;
a cylindrical outlet formed on a side surface of the trap body for discharging the wastewater that overflows from the storage section ;
the upper portion of the trap body has an inclined surface;
the trap body has a side surface facing the discharge port,
The inclined surface has an end portion that is located at or near the side surface of the trap body that faces the outlet, and the inclined surface rises continuously from the end portion toward the outlet so as to bypass the odor prevention wall, and
A vertical pipe is inserted into the inlet and the connecting member is fastened, thereby connecting the vertical pipe to the inlet,
A drain trap characterized in that the upper end of the discharge port is located above the lower end of the connecting member . The drain trap according to claim 1 , wherein the inlet of the drain trap is formed between the side surface of the trap body facing the outlet and the outlet .