JPH10195947A - Vent device of drain piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vent device capable of sufficiently making the outflow and inflow of atmosphere. SOLUTION: A forcible vent device 13 to atmosphere is provided to a ventiduct 12. As the forcible vent device 13, it is favorable that venting direction and/or infiltration rate are variable, for example, a fan 14 having variable rotational direction and/or number of revolutions can be adopted. Since pipe pressure detection devices 15a and 15b are provided to upper layer position and lower layer position of a drain piping, the venting direction and/or infiltration rate of the forcible vent device 13 can be varied on the basis of the detected pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage pipe, and more particularly to a ventilating device for a single drainage pipe.

[0002]

2. Description of the Related Art A single-pipe drainage pipe is constructed by draining a plurality of drainage pipes from the upper floor to the lower floor through drainage collecting pipes for contaminating sewage and miscellaneous drainage in a residential area on each floor. A drain horizontal main pipe is connected to a lower end of the pipe by a bend pipe, and is drained from the horizontal drain pipe to a meeting place basin.

In a single-pipe drainage pipe, the drainage falls while turning inside the vertical pipe, and an air core is secured in the center of the vertical drainage pipe to allow air to flow. Also, the top end of the drainage riser is connected to a rising top ventilation pipe, which allows ventilation between the inside of the drainage riser and the atmosphere (for example, Japanese Patent Publication No. 2-52053). Gazette).

[0004]

However, the conventional top-ventilated pipe has a ventilation opening at its upper end and is merely open to the atmosphere, so that only natural ventilation is performed. . In a vertical drain, a negative pressure or a positive pressure is generated due to an increase in the speed of drainage of the drainage or the sealing of the pipe due to the drainage. Is not enough, and the pressure in the pipe may exceed the allowable value. If the pressure in the pipe exceeds the allowable value, the trap water in the drainage device will be opened,
Odor is generated.

In view of the above problems, an object of the present invention is to provide a ventilating device for a drainage pipe which can sufficiently inflow and outflow air.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present invention takes the following technical measures. That is, a feature of the ventilating device of the drainage pipe according to the present invention resides in that means for forcibly ventilating the atmosphere is provided in the vent pipe. In this case, even if the inflow and outflow of air are not sufficient with natural ventilation, the forced ventilation can be performed to forcibly ventilate the air to ensure sufficient inflow and outflow of air.

[0007] Since the forced ventilation means can change the direction of ventilation and / or the amount of ventilation, the forced ventilation can be easily and reliably ventilated against changes in the pressure in the pipe. The forced ventilation means may be constituted by a fan whose rotation direction and / or rotation speed can be changed. The ventilation direction is changed by changing the rotation direction, and the ventilation amount is changed by changing the rotation speed. Can be easily changed.

Further, in the present invention, pipe pressure detecting means is provided at an upper layer position and a lower layer position of the drainage pipe, and the forced ventilation means is provided with a ventilation direction and / or a ventilation amount based on the pipe pressure detected by the pipe pressure detecting means. Can be changed. As described below, in the drainage pipe, the negative pressure increases at the upper layer position, and the positive pressure increases at the lower layer position. Therefore, by providing the in-pipe pressure detecting means at the upper layer position and the lower layer position, the in-pipe pressure can be efficiently known, so that it is easy to change the ventilation direction and the ventilation amount.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a single-pipe drainage pipe. Drainage horizontal branch pipes 6 are connected to drainage devices 5 such as flush toilets disposed on floors 1, 2, 3, and 4 of the building, respectively. 1-4
Are connected to a collecting pipe 7 mounted on a straight line in the vertical direction. Each of the collecting pipes 7 connects a drainage vertical pipe 8 that is piped in a vertical direction, and a horizontal main pipe 10 is connected to a lowermost layer of the drainage vertical pipe 8 via a bend pipe 9.

A top ventilation pipe 12 is connected to the uppermost layer of the drainage pipe 8 as a ventilation apparatus. The extended vent pipe 12 is for ventilating between the inside of the drainage riser 8 and the atmosphere, and the upper end thereof is a vent opening opened to the atmosphere. Ventilation means 13 is provided. The forced ventilation means 13 drains air from the drainage pipe 8.
It is forced to flow into and out of the inside, and is constituted by a fan (ventilation fan) 14. The fan 14 has a drive source (not shown) composed of a motor or the like, and its rotation direction is changeable, that is, the rotation direction is reversible, and the number of rotations is also changeable. . By changing the rotation direction and the number of rotations of the fan 14, the air flow direction and air flow rate are adjusted.

The forced ventilation means 13 is not limited to the fan 14 but includes any means capable of forcibly ventilating the air. In addition to changing the rotation speed, the amount of ventilation may be adjusted by, for example, changing the size of the ventilation opening of the extended ventilation pipe 12. Fan 14
The rotation direction and the number of rotations are controlled based on a change in the pressure inside the drainage vertical pipe 8, and the pressure inside the pipe is detected by pressure detecting means 15 provided on the vertical drainage pipe 8. The pressure detecting means 15 is composed of two pressure detecting means: an upper pressure detecting means 15a provided at an upper position of the drainage pipe 8 and a lower pressure detecting means 15b provided at a (most) lower position.

The upper layer pressure detecting means 15a detects a negative pressure, and the lower layer pressure detecting means 15b detects a positive pressure. The pressure distribution at the time of drainage in the drainage vertical pipe 8 is as shown in FIG. That is,
The negative pressure increases in the upper layer of the drainage pipe 8, and the positive pressure increases in the lower layer. Here, the cause of the negative pressure is due to an increase in the flow rate of the drainage, and the cause of the positive pressure is because the drainage seals the inside of the pipe.

The pressure detecting means 15 detects a negative pressure and a positive pressure in the pipe at two positions, an upper layer position and a lower layer position, and the rotation direction and the number of rotations of the fan 14 are controlled based on these pressures. That is, if the ventilation from the top ventilation pipe 12 is not sufficient with respect to the change in the drainage flow rate, the pressure in the pipe fluctuates greatly. The fan 14 allows air to flow into the top ventilation pipe 12 when the negative pressure detected by the upper layer pressure detection means 15a increases. Further, the lower layer pressure detecting means 1
If the positive pressure detected by 5b increases, air is allowed to flow out from the extension vent pipe 12. Furthermore, the amount of ventilation is adjusted by the magnitude of the pressure in the pipe. In this way, the fan 14 is controlled to forcibly ventilate and compensate for insufficient ventilation so that the pressure in the pipe is within an allowable value (for example, ± 40 m).
mAq).

It is preferable to adopt a bell mouth structure as shown in FIG. The opening 17 is located at the upper end 1 of the top ventilation pipe 12.
A portion near 8 is curved so as to expand in diameter toward the upper portion, and further curved downward from the upper end 18 so as to extend in the outer radial direction. It is preferable that the diameter of the upper end 18 of the extension vent pipe be 1.2 to 2.5 Di when the diameter of the main body of the extension vent pipe is Di.
Further, the radius of curvature of the curved portion of the upper end of the top ventilation pipe 18 is:
It is preferable to set to to １ ／ Di. It is preferable that the length in the vertical direction from the upper end 18 of the top ventilation pipe to the lower end of the portion 19 extending downward in a slanting manner is 1/8 to 1/5 Di.

The upper end 18 of the extension vent pipe has a leg 21
The cover portion 22 is attached through the cover to prevent rainwater or the like from entering from above. Further, the fan 14 may be provided for the extended vent pipe 12 as shown in FIG.
It may be provided for the cover part 22. With the opening 17 configured as described above, when a negative pressure is generated in the drainage vertical pipe 8, air can easily flow into the top ventilation pipe 12, and fluctuations in the pipe pressure can be suppressed and stable. I do.
Further, in this case, the air can easily flow in without providing the fan 14.

The present invention is not limited to the above embodiment. That is, for example, three or more pressure detecting means may be provided, and the position at which the ventilation pipe is provided is not limited to the uppermost layer of the drainage vertical pipe 8 like the extended ventilation pipe 12, It may be provided at another position of the drainage pipe.

[0017]

As described above, according to the present invention, air can sufficiently flow into and out of the drainage pipe, so that the pressure in the pipe can be suppressed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a drainage pipe employing a ventilation device according to the present invention.

FIG. 2 is a pressure distribution diagram in a drainage stack.

FIG. 3 is a cross-sectional view showing a structure of a ventilation opening of a top-end ventilation tube.

[Explanation of symbols]

 Reference Signs List 8 Drainage standpipe 12 Top ventilation pipe 13 Forced ventilation means 14 Fan 15a Upper pressure detection means 15b Lower pressure detection means 17 Opening

Claims (4)

[Claims] 1. A ventilating device for drainage pipes, wherein a venting pipe (12) is provided with a forced ventilation means (13) for air. 2. The drainage pipe ventilation device according to claim 1, wherein the forced ventilation means (13) has a variable ventilation direction and / or ventilation amount. 3. The drainage ventilation device according to claim 1, wherein the forced ventilation means comprises a fan whose rotation direction and / or number of rotations can be changed. 4. A pipe pressure detecting means (15) is provided at an upper layer position and a lower layer position of a drainage pipe, and said forced ventilation means (1) is provided.
The drainage pipe according to any one of claims 1 to 3, wherein 3) changes a ventilation direction and / or a ventilation amount based on the pipe pressure detected by the pipe pressure detection means (15). Ventilation device.