JP3747085B2 - Drain vent valve device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vent valve device for preventing trap breakage that can be easily installed in drainage facilities of apartment buildings and other buildings.
[0002]
[Prior art]
In a conventional drainage facility of an apartment building, for example, it is branched from a drainage horizontal branch pipe on each floor and connected to a vertical vent pipe having a vent valve at the upper end. When the air pressure in the drain pipe drops from the vent valve, air is taken in from the outside. Thus, a method for preventing trap breakage is generally adopted.
[0003]
[Problems to be solved by the invention]
According to this conventional method, the vertical ventilation pipe must be disposed together with the drainage horizontal branch pipe in the floor surface of each floor, and the vertical drainage pipe connected to the drainage horizontal branch pipe on the wall of the building. A vent valve must be provided at the apex of the vertical drainage pipe, and there is a problem that it takes time for construction and takes up space.
[0004]
An object of the present invention is to solve these problems and to provide a drainage vent valve device that can be easily installed in a small drain pipe such as an S-shaped trap.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a connecting pipe connectable in the middle of the drain pipe downstream of the drain trap, a branch pipe branched from the connection pipe, and a top end connected to the tip of the branch pipe. Ri Do and a vent tube having a check valve draining the vent valve to prevent backflow along with connecting the vent valve to the intake from the outside when the pressure of the waste water pipe drops, vent trachea substantially vertical direction And the lower end is closed, and the check valve has a floating valve body in the accommodating portion at a position below the opening of the branch pipe in the vent pipe, and a position above the opening in the vent pipe. And a valve seat for preventing the drainage valve from coming into contact with the vent valve due to pressure contact with the floating valve body which is floated by drainage flowing into the vent pipe through the branch pipe. To do.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIG.
[0007]
Reference numeral 1 denotes a drainage vent valve device. The drainage vent valve device 1 includes a connection pipe 2, a vent pipe 3, a vent valve 4 provided on the vent pipe 3, and a check valve 5 in the vent pipe 3. And a branch pipe 6 communicating the connection pipe 2 and the vent pipe 3.
[0008]
The connecting pipe 2 is molded into a pipe shape by ABS resin or the like, and the upper outer periphery of the connecting pipe 2 is threaded for connection with an S-shaped trap A or the like, and the lower outer periphery is also connected to a downstream drain pipe B. Screwed and connected to these S-shaped trap A and drain pipe B by cap nuts 2a, 2b and packings 2c, 2d.
[0009]
The vent pipe 3 is molded into a pipe shape using ABS resin or the like, similar to the connecting pipe 2, and the vent valve 4 is attached to the upper end of the vent pipe 3 via an inner screw socket 3a and the bottom lid 3b is fitted to the lower end. Thus, the lower part of the vent pipe 3 is closed.
[0010]
An upper half 6b of the branch pipe 6 is integrally molded below the oblique center from the substantially central portion of the vent pipe 3, and the upper half of the lower half 6a of the branch pipe 6 integrally molded with the connecting pipe 2 is formed. The branch pipe 6b was inserted and firmly joined by the cap nut 6c and the packing 6e to form the branch pipe 6.
[0011]
The check valve 5 is clamped in said thread socket 3a at the upper end of the vent pipe of the foamable resin spherical existing in housing portion 3c of the lower end portion of 3浮弁body 5b and vent pipe 3 When the drainage flows into the vent pipe 3 through the branch pipe 6, the floating valve body 5 b rises and comes into contact with the valve seat 5 a and drains into the vent valve 4. I tried not to reach it.
[0012]
Here, a stopper 6d is provided at the opening of the branch pipe 6b in order to prevent the floating valve body 5b from floating into the branch pipe 6 when it floats or descends.
[0013]
If the inner diameter of the branch pipe 6 is smaller than the ball diameter of the floating valve body 5b, the stopper 6d is naturally not necessary.
[0014]
Next, the vent valve 4 will be described with reference to FIGS.
[0015]
Although not shown in the upper part of the ventilation pipe 4a, a mushroom umbrella-shaped housing 4b is crowned by several ribs, and an inner chamber 4c is provided inside the housing 4b, which will be described later from the center of the inner chamber 4c. A guide shaft 4f for vertically moving the valve body 4e is provided to hang down.
[0016]
The valve body 4e is a donut-shaped plate made of flexible rubber or the like, and a valve holding member having a guide hole that holds the valve body 4e at the center and is loosely inserted into the guide shaft 4f to move up and down. A tool 4g is formed, and a plurality of ribs are provided between the valve holder 4g and the donut-shaped plate of the valve body 4e, and the inner chamber 4c and the ventilation pipe 4a communicate with each other between the ribs.
[0017]
Further, as shown in FIG. 2, the valve body 4e is brought into contact with the inner valve seat 4h at the upper end surface of the vent pipe 4a and the outer valve seat 4i at the upper end surface of the inner folded portion at the lower outer periphery of the housing 4b by its own weight. The odor from is always sealed.
[0018]
However, when draining with other drainage equipment, such as a toilet, the air in the drainage pipe is also entrained together with the drainage, so that the inside of the drainage pipe is in a negative pressure state, and the ventilation pipe 4a communicates with the drainage pipe as shown by the dotted arrow. And the inner chamber 4c is also in a negative pressure state. Thus, due to the pressure difference between the negative pressure and the atmospheric pressure of the air intake 4j connected to the outside, the valve body 4e moves up as shown in FIG. 3, and the outside air flows into the drain pipe. Thus, the sealing water of a trap such as a vanity communicating with the drain pipe is prevented from being drawn together to prevent the back flow of odor.
[0019]
Next, the operation of the drainage vent valve device 1 of the above embodiment will be described with reference to FIGS.
[0020]
FIG. 4 shows the state of use in the vanity, and an odor-preventing S-shaped trap A is usually attached below the outlet of the basin C.
[0021]
Immediately after this S-shaped trap A, the upper part of the connecting pipe 2 is connected and the lower part is connected to the drain pipe B. At the time of piping work, the connecting pipe 2 is connected first, and then the vent pipe 3 and finally the vent valve 4 are attached. In addition, since the valve body 4e operates by its own weight, the ventilation valve 4 is attached vertically.
[0022]
When the installation is completed normally, if water is collected in the basin C and drained at once after rinsing, the vent valve is used even if a self-siphon phenomenon occurs in which the sealed water in the S-shaped trap A is also discharged. The air is sucked by 4 and the sealed water of the S-shaped trap A is held.
[0023]
Since the branch pipe 6 that connects the connecting pipe 2 and the vent pipe 3 is inclined so that the vent pipe 3 faces upward, the vent pipe 3 even if drainage flows into the branch pipe 6 temporarily. It immediately flows into the drain pipe B without entering the inside.
[0024]
Furthermore, since the vent valve 4 is installed above the uppermost part of the S-shaped trap A, the drainage does not rise up to the vent valve 4 during drainage.
[0025]
However, when the drainage flows backward due to clogging on the downstream side of the drainage, the drainage overflows into the basin C as shown in FIG. 5, but drainage flows into the vent valve 4 from the branch pipe 6, but inside the vent pipe 3. Since the air is compressed by closing the valve body 4e of the vent valve 4, the drainage cannot rise in the branch pipe 6 due to the high pressure air, and the backflow can be prevented.
[0026]
However, for example, in the state where the valve body 4e of the vent valve 4 cannot be completely closed so that the small object D is sandwiched between the valve body 4e and the valve seat 4h and the air leaks, the drained water flowing backward flows through the branch pipe 6. When flowing into the vent pipe 3, the floating valve body 5 b is lifted by the drainage and presses against the valve seat 5 a to prevent the drainage from flowing backward to the vent valve 4.
[0027]
As described above, the check valve 5 by the floating valve body 5b can prevent double the back flow even if a malfunction occurs in the vent valve 4. Further, when the accessory D is sandwiched between the vent valves 4, the odor rises, but since the lower part of the washstand, the vent valves 4 can be easily inspected and replaced.
[0028]
A second embodiment for kitchen sinks will be described with reference to FIG.
[0029]
As shown in FIG. 7, the odor-preventing trap A ′ used in the kitchen sink has a strainer E for receiving garbage or the like under the sink, and a ring is attached to the lower surface of the strainer E, so-called Although it is a kind of what is called a one trap or belt wrap, like the S-shaped trap, this trap is also likely to break if it is drained and drained at once.
[0030]
The kitchen sink is thicker than the pipe diameter of the S-shaped trap used in the washstand, etc. Therefore, the connecting pipe 12 connected to the trap A ′ and the drain pipe B ′ is thick and the connection is somewhat complicated. 3, the vent valve 4 and the check valve 5 are exactly the same, have the same operating principle, and can be easily installed in a small size in the lower part of the kitchen sink.
[0031]
【The invention's effect】
As described above, according to the present invention, since the vent valve for holding the sealing water of the drain trap can be attached to the drain pipe immediately after the trap at the lower part of the sink or kitchen sink through the connecting pipe, It can be installed in the wall and has the effect of facilitating the construction work.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first embodiment of the present invention.
FIG. 2 is a sectional view of the vent valve.
FIG. 3 is an operation explanatory view of the vent valve.
[Figure 4]
FIG. 6 is a cross-sectional view showing the operation of the first embodiment.
FIG. 7 is a front view in which a part of the installation state of the second embodiment is removed.
[Explanation of symbols]
1 Drainage vent valve device 2 Connection pipe 3 Ventilation pipe
3c Housing 4 Ventilation valve 5 Check valve
5a Valve seat
5b Floating valve 6 Branch pipe

Claims (4)

A connecting pipe connectable in the middle of the drain pipe downstream of the drain trap, a branch pipe branched from the connecting pipe, and connected to the tip of the branch pipe from the outside when the pressure in the drain pipe drops to the upper end. with connecting vent valve for intake Ri Do and a vent tube drainage to vent valve has a check valve to prevent backflow, closes the lower end with vent pipe is disposed substantially vertically, the The check valve includes a floating valve body in a housing portion of the vent pipe located below the opening of the branch pipe, and a check valve provided at a position above the opening in the vent pipe via the branch pipe. A drainage vent valve device comprising: a valve seat that prevents the floating valve body floating by the drainage flowing into the vent pipe from coming into pressure contact and preventing the drainage from flowing backward to the vent valve.   The drainage vent valve device according to claim 1, wherein a stopper for preventing the floating valve body from flowing into the branch pipe is provided in the opening.   2. The drainage vent valve device according to claim 1, wherein the vent valve is disposed above the uppermost part of the drainage trap.   2. The drainage vent valve device according to claim 1, wherein the branch pipe is formed to be separable at a central portion.

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