Drain traps and drainage devices

Abstract

To provide a drain trap that is less likely to cause water leakage.SOLUTION: A drainage trap 1 comprises: a body part 4 that is provided between a drain port 210 and a drain pipe 220 and has a bottom with a drainage hole 44 formed therein in the form of a bottomed cylindrical shape; a connection pipe part 5 that extends downward from the bottom part 42 and is connected to the drain pipe 220; a water sealing tube 6 that extends from a peripheral edge of the drain hole 44 toward an upper part of the body part and can store sealed water in the bottom part; and an extension pipe 7 that extends downward from the water sealing tube 6, has an outer diameter smaller than an inner diameter of the connection pipe part 5, and can be inserted into the drain pipe 220.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to drain traps and drain devices. [Background technology]

[0002] Conventionally, the drain outlet of a kitchen sink or the like is connected to a drain pipe to drain water. A substantially cylindrical drain trap with a bottom is placed between the drain outlet and the drain pipe. It is known that the drain trap is attached to the outside of the drain pipe, and the overlapping portion of the drain trap and the drain pipe is fastened together with a nut (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-13175 Summary of the Invention [Problem to be solved by the invention]

[0004] If the nut was not tightened properly, water could leak between the drain trap and the drain pipe. [Means for solving the problem]

[0005] The present disclosure relates to a drain trap having a main body portion disposed between a drain outlet and a drain pipe, the main body portion having a bottomed cylindrical shape with a drain hole formed in the bottom, a connecting pipe portion extending downward from the bottom and connected to the drain pipe, a water sealing cylinder extending from the periphery of the drain hole toward the top of the main body portion and capable of storing sealing water in the bottom, and an extension pipe extending downward from the water sealing cylinder, having an outer diameter smaller than the inner diameter of the connecting pipe portion and capable of being inserted inside the drain pipe. [Brief explanation of the drawings]

[0006] [Figure 1] 1 is a cross-sectional view showing a drainage device according to an embodiment of the present invention; [Figure 2]FIG. 2 is a partially enlarged perspective cross-sectional view of the drainage device of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. As shown in Fig. 1, a drainage device 10 is provided in a drainage facility 200 that discharges and drains hot and cold water, such as a kitchen sink or a bathroom sink. The drainage device 10 includes a drain trap 1, a lock nut 2, and a V-packing 3 as an elastic member.

[0008] As shown in Figure 1, the drain trap 1 is a component that connects the drain outlet 210 of the drainage equipment 200 to the drain pipe 220, and prevents odors, pests, etc. from entering the room from the drain pipe 220 side via the drain outlet 210. The drain trap 1 has a main body 4, a connecting pipe 5, a water sealing cylinder 6, an extension pipe 7, and a bowl lid 8.

[0009] The main body 4 is provided between the drain outlet 210 and the drain pipe 220, and has a cylindrical shape with a bottom. The main body 4 has a side wall 41, a bottom 42, an upper opening 43, and a drain hole 44.

[0010] The side wall 41 is the side surface of the tube, and gradually narrows in diameter from top to bottom, forming a step. The bottom 42 is a flat surface that extends radially inward from the lower end of the side wall 41, intersecting the extension direction of the side wall 41. The upper opening 43 has an open top facing the bottom 42. The upper opening 43 is connected to the drain outlet 210. A threaded groove is formed on the outer periphery of the periphery of the upper opening 43, and the upper opening 43 has a nozzle 431 that is connected to the drainage equipment 200 with a nut or the like. The drain hole 44 is a through hole formed on the radial center side of the bottom 42. The interior of the main body 4 communicates with the drain pipe 220 via the drain hole 44.

[0011] As shown in FIG. 2, the connecting pipe portion 5 is a substantially cylindrical portion extending downward from the bottom 42 of the main body portion 4. The connecting pipe portion 5 is a portion that is connected to the outside of the drain pipe 220, and has an inner diameter larger than the outer diameter of the drain pipe 220. The connecting pipe portion 5 has a thread groove 51 and an inclined surface 52. The thread groove 51 is formed on the outer periphery of the connecting pipe portion 5 and is formed so as to be engageable with a lock nut 2, which will be described later. The inclined surface 52 is a flat surface at the lower end of the connecting pipe portion 5 that inclines upward from the outer periphery to the inner periphery. The V-packing 3, which will be described later, abuts against the inclined surface 52.

[0012] The water seal cylinder 6 is a cylindrical part that extends upward from the periphery of the drain hole 44 of the main body 4. The water seal cylinder 6 has a water seal cylinder side wall 61 and a water seal cylinder opening 62. The water seal cylinder side wall 61 extends in the vertical direction near the center of the main body 4. The height of the water seal cylinder side wall 61 is, for example, lower than half the height of the main body 4. As the water seal cylinder 6 extends upward inside the main body 4, it is positioned so that seal water can be stored between the water seal cylinder side wall 61, the side wall 41 of the main body 4, and the bottom 42. The water seal cylinder opening 62 is lower than the upper opening 43 of the main body 4 and opens upward.

[0013] The extension pipe 7 is molded integrally with the water seal cylinder 6 and is a cylindrical part extending downward from the lower end of the water seal cylinder 6. The inner circumferential surface of the extension pipe 7 and the inner circumferential surface of the water seal cylinder 6 are continuous without any steps. The extension pipe 7 has an outer diameter smaller than the inner diameter of the connecting pipe portion 5 and is arranged inside the connecting pipe portion 5. A gap S1 is formed between the outer circumferential surface of the extension pipe 7 and the inner circumferential surface of the connecting pipe portion 5. As shown in Figure 1, the upper end of the drain pipe 220 can be inserted into this gap S1, and the extension pipe 7 is inserted inside the drain pipe 220 so that it overlaps with the upper part of the drain pipe 220. On the outer periphery of the extension pipe 7, in order from radially outward, the upper part of the drain pipe 220, a V-packing 3 described later, the connecting pipe portion 5, and a lock nut 2 described later are arranged. The vertical dimension of the extension pipe 7 is not particularly limited, but if it is too long, workability will be reduced, and if it is too short, there is a concern that the wastewater will rise due to capillary action. The length of the extension pipe 7 can be, for example, about 20 mm.

[0014] As shown in Figure 1, the lid portion 8 has a roughly U-shaped cross section and is shaped like a lid for a bowl that opens downwards. The lid portion 8 is placed so as to cover the top of the water seal cylinder 6. Because the lid portion 8 lightly covers the water seal cylinder opening 62, it prevents bad odors, pests, etc. that flow back from the water seal cylinder 6, which is connected to the drain pipe 220, from flowing into the room.

[0015] The lock nut 2 is formed in an annular shape and is arranged along the outer periphery of the connecting pipe portion 5. The lock nut 2 engages with the thread groove 51 of the connecting pipe portion 5 and fastens the portion where the upstream end of the drain pipe 220 and the connecting pipe portion 5 overlap from above the connecting pipe portion 5. The lock nut 2 has a nut side wall portion 22, an upper nut through-hole 23a, a lower nut through-hole 23b, and a nut bottom surface portion 24.

[0016] The nut side wall portion 22 is a portion that extends in the vertical direction along the outer circumferential surface of the connecting pipe portion 5. A thread groove 21 that engages with the thread groove 51 of the connecting pipe portion 5 is formed on the inner circumferential surface of the nut side wall portion 22.

[0017] The nut upper through hole 23a is a substantially circular through hole formed on the upper end side when fastened to the connecting pipe part 5. The diameter of the nut upper through hole 23a is larger than the outer shape of the connecting pipe part 5. The nut lower through hole 23b is a substantially circular through hole formed on the lower end side when fastened to the connecting pipe part 5. The diameter of the nut lower through hole 23b is larger than the outer diameter of the drain pipe 220 and smaller than the outer shape of the connecting pipe part 5.

[0018] The nut bottom surface portion 24 is a flat portion that extends from the lower end of the nut side wall portion 22 toward the inside in the radial direction of the lock nut 2. A nut lower through-hole 23b is formed on the center side of the nut bottom surface portion 24.

[0019] The V-packing 3 is an annular elastic body that can be placed on the inner periphery of the lock nut 2, and is made of, for example, rubber. The V-packing has a packing side portion 31, a packing lower surface 32, a packing inclined surface 33, and a packing through hole 34.

[0020] The packing side portion 31 is positioned inside the nut side wall portion 22, facing the nut side wall portion 22. The packing side portion 31 is a cylindrical tube portion extending in the vertical direction. The inner surface of the packing side portion 31 is fitted so as to closely contact the outer surface of the drain pipe 220. The packing lower surface 32 is positioned on the nut bottom portion 24 of the lock nut 2 with the V-packing 3 positioned on the inner side of the lock nut 2. The packing inclined surface 33 is a surface that slopes upward from the upper end of the outer surface side of the packing side portion 31 to the upper end of the inner surface side. The packing inclined surface 33 is positioned so as to contact the inclined surface 52 of the connecting pipe portion 5. The packing through hole 34 is a through hole formed inside the packing side portion 31. The inner diameter of the packing through hole 34 matches the outer diameter of the drain pipe 220 so that it can abut against the outer surface of the drain pipe 220.

[0021] The flow of drainage water in a drainage device 10 using the drain trap 1 of this embodiment will be described. As shown in FIGS. 1 and 2 , the lock nut 2 houses a V-shaped packing 3 therein. The V-shaped packing inclined surface 33 of the V-shaped packing 3 is aligned with the inclined surface 52 of the connecting pipe portion 5, and the lock nut 2 is fastened so that the narrow upper end of the inclined surface 33 closes the gap S2 formed between the outer circumferential surface of the drain pipe 220 and the inner circumferential surface of the connecting pipe portion 5. If the lock nut 2 is not fastened properly, or if the extension pipe 7 is not formed, there is a concern that some of the water trickling down the lower end of the water seal cylinder 6 or flowing at the upper end of the drain pipe 220 may leak from the upper end of the drain pipe 220 through the gap S2 between the drain pipe 220 and the connecting pipe portion 5 to the outside of the drain pipe 220. Water that leaks outside the drain pipe 220 may seep out of the lock nut 2 and leak. However, in this embodiment, the extension pipe 7 extends downward from the bottom end of the water seal cylinder 6, and the extension pipe 7 is inserted into the drain pipe 220. Therefore, the water that has flowed down the water seal cylinder 6 as shown by the arrow in Figure 2 continues to flow down the extension pipe 7 and flows inside the drain pipe 220.

[0022] According to this embodiment, the following effects are achieved: The drain trap 1 is configured to include a main body 4 that is provided between the drain outlet 210 and the drain pipe 220 and has a drain hole 44 formed in its bottom, a connecting pipe 5 that extends downward from the bottom 42 and is connected to the drain pipe 220, a water seal cylinder 6 that extends from the periphery of the drain hole 44 toward the top of the main body 4 and is capable of storing seal water in the bottom 42, and an extension pipe 7 that extends downward from the water seal cylinder 6 and has an outer diameter smaller than the inner diameter of the connecting pipe 5 and is insertable into the drain pipe 220. Because the extension pipe 7 extends downward from the water seal cylinder 6 and is inserted into the drain pipe 220, water that runs down the water seal cylinder 6 flows along the extension pipe 7 through the interior of the drain pipe 220. Therefore, even if a gap occurs between the connecting pipe part 5 and the drain pipe 220, the drain water flows into the drain pipe 220 through the extension pipe 7, making it difficult for water to leak through the gap, and water leakage can be prevented or suppressed. For example, there are cases where the lock nut 2 is not tightened properly when installing the drain trap 1, but water leakage is prevented even in such cases, so water leakage can be prevented or suppressed regardless of the skill of the installer.

[0023] According to this embodiment, the water seal cylinder 6 and the extension pipe 7 are molded as a single unit. By forming the water seal cylinder 6 and the extension pipe 7 as a single unit, manufacturing and installation become easier, and at the same time, since no joints or the like are formed between the water seal cylinder 6 and the extension pipe 7, wastewater can flow down smoothly.

[0024] According to this embodiment, the inner circumferential surface of the water sealing cylinder 6 and the inner circumferential surface of the extension pipe 7 are continuous without any steps. This allows the wastewater to flow smoothly down, achieving the same effect as above.

[0025] According to this embodiment, a gap S1 into which the drain pipe 220 can be inserted is formed between the inner peripheral surface of the connecting pipe portion 5 and the outer peripheral surface of the extension pipe 7. As a result, by inserting the upper end of the drain pipe 220 into the gap S1, the drain trap 1 can be easily attached to the drain pipe 220, and water leakage can be prevented or suppressed.

[0026] According to this embodiment, the drainage device 10 is configured to include the above-mentioned drain trap 1, a lock nut 2 arranged along the outer periphery of the connecting pipe portion 5 connected to the outside of the drain pipe 220, and a V-packing 3 arranged on the inner periphery of the lock nut 2 and sealing the gap S1 between the drain pipe 220 and the connecting pipe portion 5. When fastening the connecting pipe portion 5 to the drain pipe 220 with the lock nut 2, even if the lock nut 2 is not fastened properly and the V-packing 3 is unable to tightly seal the drain pipe 220 and the connecting pipe portion 5, water leakage can be prevented or suppressed by using the above-mentioned drain trap 1.

[0027] The present disclosure is not limited to the above-described embodiments, and modifications, improvements, etc. within the scope of achieving the object of the present disclosure are included in the present disclosure. In the above-described embodiments, the extension pipe 7 is not in contact with the drain pipe 220, and a gap S1 is formed between the extension pipe 7 and the inner circumferential surface of the drain pipe 220. However, the extension pipe 7 may be in contact with the inner circumferential surface of the drain pipe 220. The extension pipe 7 may be inserted inside the inner circumferential surface of the drain pipe 220, regardless of whether the thickness of the drain pipe 220 is thick or thin. [Explanation of symbols]

[0028] 1 drain trap, 2 lock nut, 3 elastic member, 4 main body, 5 connecting pipe, 6 water seal cylinder, 7 extension pipe, 10 drain device, 42 bottom, 44 drain hole, 210 drain outlet, 220 drain pipe

Claims

1. A main body portion provided between the drain outlet and the drain pipe, the main body portion having a bottomed cylindrical bottom and a drain hole formed in the bottom portion; a connecting pipe portion extending downward from the bottom and connected to the drain pipe; a water seal cylinder formed continuously with the main body, extending from the periphery of the drain hole toward the top of the main body, and capable of storing seal water at the bottom; an extension pipe extending downward from the water sealing cylinder, having an outer diameter smaller than the inner diameter of the connecting pipe portion and capable of being inserted into the drain pipe; A drain trap in which the water seal cylinder and the extension pipe are integrally formed.

2. The drain trap according to claim 1 , wherein an inner peripheral surface of the water seal cylinder and an inner peripheral surface of the extension pipe are continuous without any steps.

3. The drain trap according to claim 1 or 2, wherein a gap into which the drain pipe can be inserted is formed between an inner peripheral surface of the connecting pipe portion and an outer peripheral surface of the extension pipe.

4. The drain trap according to any one of claims 1 to 3; a lock nut disposed along the outer periphery of the connecting pipe portion connected to the outside of the drain pipe; A drainage device comprising: an elastic member arranged on the inner side of the lock nut and sealing the gap between the drainage pipe and the connecting pipe portion.

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