JP2006274609A - Down pipe/drain pipe trap structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide "a down pipe/drain pipe trap structure" which prevents a malodor from a drain pipe from flowing back into a down pipe, because rainwater flows smoothly. <P>SOLUTION: This down pipe/drain pipe trap structure 20 is provided between the down pipe 21 and the drain pipe 22. Two malodor return valves 28 (as a trap for the malodor) are built in upper and lower positions in a tubular connecting pipe body 27 which is brought into external contact with a side wall 24 of a lower end 23 of the down pipe 21 and brought into internal contact with a side wall 26 of an upper end 25 of the drain pipe 22. The malodor return valve 28 is fixed to an inner peripheral part 27b of the connecting pipe body 27 so as to block a pipe cross section 27a of the connecting pipe body 27. A section from an outer peripheral part 28a of the malodor return valve to the center P is divided into a plurality of fan-shaped parts Q; and each of the fan-shaped parts Q has flexibility which makes its leading end Q1 bent in the direction of the axis 29 of the connecting pipe body 27 by the rainwater indicated by an arrow. The upper end 25 of the drain pipe 22 is covered with a cover 30 which is fixed to the outer periphery of the connecting pipe body 27. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

 The present invention relates to a connection structure between a gutter as a rain gutter and a drain pipe, and more particularly, to a technique for preventing a strange odor from the drain pipe from entering the gutter.

Conventionally, rainwater from the roof of buildings is drained into drainage pipes such as underground burials through the dredging, but when the sealing between the dredging and the drainage pipe is not sufficient, odor is generated from the drainage pipe to the dredging. There was a problem that the odor that flowed up and rose up the ridge invaded the building and made it uncomfortable.
Furthermore, since the odor contains ammonia and the like, when the rain gutter (soot, eaves) contains a metallic material, it may be corroded (eroded) by ammonia or the like.

 Then, the content published in patent document 1 is known as a prior art for solving the inflow of the odor from a drain pipe to a soot.

 As shown in FIG. 3, the conventional trap / drain pipe trap structure has a trap cover 5 including a trap cover body 1 inserted and connected to the trap 3 and a skirt portion 2 covering the drain pipe 4. A trap T for sealing water between the trough 3 and the drain pipe 4 is installed inside.

  The trap T includes a short pipe portion 6, a cap 8 provided above the short pipe portion 6, and a rainwater receiving portion 7 attached to the short pipe portion 6. The cap 8 is covered so as to cover the upper end 6a of the short tube portion 6 so that the lower end portion 8a of the cap 8 is at an intermediate position between the bottom surface 9 of the rain water receiving portion 7 and the upper end 6a (sealing surface 10) of the short tube portion 6. It is attached to the short pipe part 6 via the member 11.

 Then, as shown by the arrow, the rainwater flowing from the gutter 3 first accumulates in the rainwater receiving portion 7. When the rainwater further increases and exceeds the upper end of the rainwater receiving part 7, it flows from the upper end 6 a of the short pipe part 6 to the drain pipe 4 through the short pipe part 6.

As described above, the rainwater level (sealing surface 10) in the rainwater receiving portion 7 is located at the upper end 6a of the short pipe portion 6, and the rainwater in the rainwater receiving portion 7 causes the space in the trough 3 and the drainage pipe 4 to pass through. Since it can be completely blocked from the space, the intrusion of odor from the drain pipe 4 to the basket 3 is eliminated.
JP-A-8-158563

  However, in the above trap / drain pipe trap structure, the flow of rainwater flows almost inward, so the opening area M4 of the short pipe portion 6 in the trap T is smaller than the opening area M1 of the trap 3, Further, the opening area M3 in the gap between the upper end 6a of the short pipe portion 6 and the cap 8 is smaller than the opening area M2 in the gap between the rainwater receiving portion 7 and the cap 8.

  In other words, the configuration is such that M1> M2> M3 and M1> M4, and in particular, since the rainwater receiving portion 7 is restricted from the opening area M2 to the opening area M3, the rainwater from the eaves 3 has a large resistance to rainwater. As a result, a smooth flow to the short pipe portion 6 (and the drain pipe 4) could not be obtained, and rainwater sometimes overflowed upstream of the dredge 3 during heavy rain.

 Therefore, the present invention has been made in view of the problems of the prior art, and provides a “trunk / drain pipe trap structure” in which the flow of rainwater is smooth and the odor from the drain pipe does not flow back into the bowl. The purpose is to do.

 According to the first aspect of the present invention, the cylindrical connecting pipe body circumscribing the side wall of the lower end portion of the tub and inscribed in the side wall of the upper end portion of the drain pipe has an odor return valve (as an odor trap). Built-in, the odor return valve is fixed to the inner periphery of the connection pipe body so as to block the cross section of the connection pipe body, and is divided into a plurality of fan-shaped parts from the outer periphery to the center of the odor return valve. Each fan-shaped portion is characterized in that the tip portion thereof is flexible in the axial direction of the connecting pipe body due to rain water.

 In this trap / drain pipe trap structure, the odor return valve is usually fixed to the inner periphery of the connecting pipe body so as to block the cross section of the connecting pipe body (normally without rainwater). Can be closed.

  The odor return valve is divided into a plurality of fan-shaped parts from the outer peripheral part to the center, and each fan-shaped part has the flexibility that the tip part bends in the axial direction of the connecting pipe body due to rain water. It can pass through the odor return valve.

  A second aspect of the invention is the trap / drain pipe trap structure according to the first aspect, wherein two sets of the odor return valves built in the connecting pipe main body are provided.

  With this trap / drain pipe trap structure, two sets of the odor return valves are provided, so that the cross section of the connecting pipe body can be more reliably closed (double) in the absence of rainwater.

  According to the first aspect of the present invention, the odor return valve is fixed to the inner peripheral portion of the connection pipe body so as to close the cross section of the connection pipe body, and is normally in a closed state. It is possible to prevent the odor from flowing back to the bag.

  Since each fan-shaped portion of the odor return valve has the flexibility that its tip is bent in the axial direction of the connecting pipe body by rainwater, rainwater can pass through the odor return valve by its own weight. Can flow smoothly in a straight line.

  Further, even when rainwater passes through the opening at the tip of the fan-like portion of the odor return valve, the odor return valve opening itself is blocked by the rainwater that passes through, so that the odor from the drain pipe is It is possible to prevent backflow to the heel.

  According to the second aspect of the present invention, since two sets of the odor return valves are provided, the cross section of the connecting pipe body can be more reliably closed (double), so that the odor from the drain pipe flows back to the soot. Nothing will happen.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

<Configuration of dredging / drain pipe trap structure>
As shown in FIG. 1, FIG. 2 (a), (b), the dredging / drainage pipe trap structure 20 of the present invention is provided between a gutter 21 and a drainage pipe 22. A cylindrical connecting pipe main body 27 circumscribing the side wall 24 of the drainage pipe 23 and inscribed in the side wall 26 of the upper end portion 25 of the drain pipe 22 incorporates two sets of odor return valves 28 (as odor traps) up and down. ing.

 The odor return valve 28 is fixed to the inner peripheral portion 27b of the connection pipe main body 27 so as to block the pipe cross section 27a of the connection pipe main body 27.

 Furthermore, it is divided into a plurality of fan-shaped parts Q from the outer peripheral part 28a of the odor return valve to the center P, and each fan-shaped part Q has its tip Q1 in the direction of the axis 29 of the connecting pipe main body 27 by the flow of rainwater indicated by an arrow. It has flexibility to bend. The degree to which the fan-shaped portion Q is bent and opened is automatically determined in proportion to the amount of rain (the weight of rain).

 Now, FIG. 1 shows a state in which the odor return valve 28 is bent at the tip Q1 of the connecting pipe body 27 by rain water.

  The upper end portion 25 of the drain pipe 22 is covered with a cover 30 fixed to the outer periphery of the connection pipe body 27.

 In order to make the odor return valve 28 flexible, for example, rubber or the like is used as its material. The cross-sectional shape of the fan-shaped portion Q of the odor return valve 28 is centered from the outer peripheral portion 28a of the odor return valve so that each fan-shaped portion Q smoothly bends and rainwater flows around the shaft 29 when rainwater passes. It has a gently tapered shape over P (tip Q1).

 The attachment of the odor return valve 28 to the inner peripheral portion 27b of the connecting pipe main body 27 is fixed with an adhesive or the like. It is preferable to endure.

 As the material of the connecting pipe main body 27, hard vinyl chloride resin or the like is generally used in the same manner as the material used for the trough 21 and the drain pipe 22, but stainless steel or galvanized steel may be used.

<Operation of dredging / water pipe trap structure>
The odor return valve 28 is fixed to the inner peripheral portion 27b of the connecting pipe main body 27 so as to close the pipe cross section 27a of the connecting pipe main body 27 and is normally closed, so that the odor R2 from the drain pipe 22 is reduced. Backflow to 21 can be prevented.

 Since each fan-shaped portion Q of the odor return valve 28 is bent in the direction of the axis 29 of the connecting pipe body 27 by the dead weight of rainwater, rainwater can pass through the odor return valve 28 linearly. Flows smoothly.

Further, even when rainwater passes through the fan-shaped portion Q of the odor return valve 28, the pipe cross section 27a is blocked by the odor return valve 28 and the rainwater itself passing therethrough, so that the odor rising from the drain pipe 22 is Backflow to 21 can be prevented. (In FIG. 1, the flow of rainwater is indicated by arrow R1, and the flow of odor is indicated by arrow R2.)
Since two sets of the odor return valves 28 are provided, even if odor leaks upward from the odor return valve 28 on the downstream side, the ascending path is blocked by the odor return valve 28 on the upstream side. Since the odor drifting between the connection pipe bodies 27 is discharged from the odor return valve 28 on the downstream side so as to be sucked into the rainwater flow, it is double that the odor from the drain pipe 22 flows back to the bowl 21. Can be prevented.

  Even when ammonia or the like is contained in the odor, rain gutters (metals, eaves) containing metallic materials are not corroded (eroded) by ammonia or the like.

  As mentioned above, although embodiment of this invention was described based on drawing, all said Example showed an example of this invention, and it cannot be overemphasized that this invention should not be limited to these. Absent.

 The odor return valve 28 can also be formed integrally with the connecting pipe main body 27. In this case, for example, a rubber material or the like having flexibility (elasticity) required for the odor return valve 28 is used. Used.

It is sectional drawing which shows the trough and drain pipe trap structure which connects the trough and drain pipe of this invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, where (a) shows a state in which an odor return valve 28 is closed, and (b) shows a state in which the odor return valve 28 is opened. It is sectional drawing which shows the soot and drain pipe trap structure in a prior art example.

Explanation of symbols

20 竪 樋 / drain pipe trap structure 21 ２２ 22 drain pipe 23 lower end 24 side wall 25 upper end part 26 side wall 27 connection pipe body 27a pipe cross section 27b inner circumference part 28 odor return valve 28a outer circumference part 29 shaft 30 cover P center Q fan shape Part Q1 Tip

Claims (2)

A trap / drain pipe trap structure provided between the trap and the drain pipe,
A cylindrical connecting pipe body circumscribing the side wall of the lower end of the tub and inscribed in the side wall of the upper end of the drain pipe incorporates an odor return valve (as an odor trap),
The odor return valve is fixed to the inner peripheral portion of the connection pipe body so as to block the cross section of the connection pipe main body, and is divided into a plurality of fan-shaped portions from the outer peripheral portion to the center of the odor return valve. The trapezoid / drainage pipe trap structure is characterized in that the tip part has flexibility to be bent in the axial direction of the connecting pipe body by rainwater.   2. The trap / drain pipe trap structure according to claim 1, wherein two sets of the odor return valves built in the connecting pipe main body are provided.

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