JPH0821553A - Vent valve - Google Patents

Abstract

PURPOSE:To prevent impairing of the water sealing performance of a U-form trap furnished on an exhaust pipe when the internal passage of a riser pipe with which exhaust pipes are connected in a plurality of locations, is put in a negative pressure by the exhaust water sent from the exhaust pipe, introducing an arrangement such that all component parts can be made in synthetic resin molding, and perform installation of these component parts easily. CONSTITUTION:A short pipe 1 in an inverted U-form is connected with the top of a riser pipe E and is fitted with a support 3 having a seat 34 in such a conical form as narrowing downward, and a cover 4 is installed on the support 3 so that a valve chest 5 is formed, in which a hollow spherical valve element 2 is accommodate When a negative pressure is generated in the internal passage of the short pipe 1 or the riser pipe E by the exhaust water sent from an exhaust pipe C, the valve element 2 is levitated to open the valve opening 33, and thereby the air influx is promoted to lead to elimination of the negative pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation valve, and more particularly to a ventilation valve installed at the upper end of a vertical pipe to which a drain pipe extending from a water supply area is connected.

[0002]

2. Description of the Related Art In high-rise buildings such as condominiums, measures are taken to prevent the odor of drainage from flowing back to the drainage outlets of the water supply areas (washroom, kitchen, etc.) of each floor. As a mechanism for preventing such a reverse flow of odor, there is, for example, a U-shaped trap using a U-shaped tube. The U-shaped trap has a function of constantly storing water in its internal space and sealing off odors to prevent its backflow.

By the way, a drainage facility as shown in FIG. 7, that is, a U-shaped trap B is installed at the drainage outlet of the water circulation area A of each floor of a high-rise building, and each U-shaped trap B is connected to each floor. In the drainage facility in which the drainage pipe C is connected to the vertical pipe D common to them, when drainage is performed at the water supply point A on the lower floor, the vertical pipe is provided above the connection point of the drainage pipe C on that floor. The internal space of D and drain pipe C is sucked,
Due to the suction action, the water accumulated in the U-shaped trap B provided on the upper floor may be sucked and the water sealing action of the U-shaped trap B may be impaired.

Therefore, conventionally, a ventilation valve E is installed at the upper end of the vertical pipe D, and when the above-described suction action occurs, the water accumulated in the U-shaped trap B is sucked and the U-shaped trap B is sucked. Before the water-sealing action of the trap B is impaired, air is introduced from the vent valve to cancel the suction action.

As a ventilation valve of this kind, a Japanese Patent Publication No.
Various structures, such as those described in Japanese Patent Publication No. 39048-, were known.

[0006]

However, since the conventionally known ventilation valve has a complicated structure including a diaphragm valve and a lifting guide for the diaphragm valve, it is expensive and has a problem in maintenance. was there.

The present invention has been made in view of the above circumstances and problems, and a synthetic resin molded body can be used for all the components, and the components can be easily assembled. The purpose of the present invention is to provide a ventilation valve that is simple and inexpensive.

[0008]

A ventilation valve according to a first aspect of the present invention is connected to an upper end of a standing pipe to which a drainage pipe extending from a water passage is connected, and one end of which is open to the air. An inverted U-shaped short tube, a spherical valve body, and a valve hole provided at the falling portion on one end side of the short tube and having a diameter smaller than the diameter of the valve body at the center. And a cover body having a support body having a downward conical seat surface and an opening serving as a vent hole, and forming a valve chamber that cooperates with the support body to accommodate the valve body so that the valve body can move up and down. And is equipped with,
In such a vent valve, as in the invention according to claim 2, the short pipe, the support body and the cover body are made of synthetic resin molding, and the valve body is made of a hollow synthetic resin molding. It is possible to adopt.

[0009]

In the ventilation valve according to the invention described in claim 1, the other end of the inverted U-shaped short pipe is connected to the upper end of the vertical pipe, and the ventilation valve is arranged at the falling portion on the one end side of the short pipe. The cover body is attached to the support body, and the spherical valve body is housed in the valve chamber formed by the cooperation of the support body and the cover body.

In the ventilation valve thus installed, the inside of the short pipe or the standing pipe communicating with the valve chamber is not drained from any drain pipe connected to a plurality of upper and lower portions of the standing pipe. When the pressure in the passage is equal to the atmospheric pressure, the valve body rides on the lower constriction of the support body on the seat surface of the conical shape by its own weight to close the valve hole.

When the internal passage of the short pipe or the vertical pipe communicating with the valve chamber is sucked due to the drainage from any one of the drain pipes, the differential pressure between the atmospheric pressure and these internal passages is When the valve body is so small that it cannot be lifted up against its own weight in the valve chamber, the valve body rides on the constricted conical seat surface of the support due to its own weight and keeps the valve hole closed. . However, when the pressure difference between the atmospheric pressure and the internal passages is large enough to lift the valve body against its own weight in the valve chamber, the valve body has a constricted conical shape of the support body against its own weight. Float from the seat and open the valve hole. Therefore, the air flows from the valve hole through the valve chamber into the internal passage of the short pipe or the vertical pipe, and the suction action caused by the drainage is immediately eliminated.

When the short pipe, the support and the cover are made of synthetic resin molding and the valve body is made of hollow synthetic resin molding as in the invention described in claim 2, the manufacturing cost is low. Easy to suppress.

Further, since the short pipe has an inverted U-shape, it is possible to prevent rainwater from falling into the internal passage of the vertical pipe through the short pipe during rainfall.

[0014]

1 is a vertical sectional view showing a state in which a ventilation valve E according to an embodiment of the present invention is installed on an upper end portion of a vertical pipe D. FIG. 2 is a sectional view taken along line II-II of FIG. Is an explanatory view of a mounting portion of the support body 3 and the cover body 4, and FIG. 4 is a support body 3 and the valve body 2.
5 is an exploded view of the cover body 4, and FIG.

The vertical pipe D shown in FIG. 1 is the same as the vertical pipe D described in FIG. 7, and drain pipes C of each floor of a high-rise building are connected to the vertical pipe D at a plurality of upper and lower positions. . Note that FIG. 1 shows the drain pipe C connected to the highest position.

In the ventilation valve E, the short pipe 1 is formed in an inverted U shape, and is connected to a falling portion 12 on one end side which is opened downward into the air and an upper end portion of the vertical pipe E. The falling portion 13 on the other end side is communicated with the semicircular arc portion 14. A receiving port 15 is provided at the other end, and the receiving port 15 is inserted and connected to the upper end of the standing pipe E. The valve element 2 is a spherical one. The support body 3 integrally includes a tubular portion 31 and a downwardly conical seat plate portion 32 that extends from the upper end edge of the tubular portion 31 toward the axial center of the tubular portion 31. A valve hole 33 having a diameter smaller than the diameter of the valve body 2 is formed in the valve body 2, and the surface of the seat plate portion 32 is narrowed downward to form a conical seat surface 34. In this support body 3, the tubular portion 31 is inserted into the falling portion 12 on one end side of the short pipe 1 in an internally fitted state, and the overlapping portion of the tubular portion 31 and the short pipe 1 is joined with an adhesive. This keeps it airtight. Cover body 4
Has two main leg portions 42, 42 extending from two positions 180 degrees apart on the outer circumference of the round plate portion 41 and extending 90 degrees with respect to each of the main leg portions 42, 42. The inclined auxiliary leg portions 43, 43 which also serve as spacers and are shorter than the main leg portions 42, 42 extend from the location. Then, as shown in FIG. 4 and FIG.
A pair of engaging claw pieces 44, 44 facing each other are provided at the end portions of 2, 42 at intervals corresponding to the thickness of the seat plate portion 32 of the support body 3 described above. Therefore, a recess 45 having a width corresponding to the thickness of the seat plate portion 32 is formed between the engaging claw pieces 44. Then, the ends of the main leg portions 42, 42 of the cover body 4 are inserted into the engagement hole portions 35, 35 provided at two positions of the seat plate portion 32 of the support body 3. Thereby, as shown in FIG. 3, the hole edge portions of the engaging hole portions 35, 35 of the seat plate portion 32 are sandwiched between the engaging claw pieces 44 provided on the main leg portions 42, 42 and facing each other. At the same time, the auxiliary leg portion 43 stretches over the seat surface 34. The cover body 4 thus attached to the support body 3 cooperates with the support body 3 to form a valve chamber 5 between them. The valve body 2 is housed in the valve chamber 5 so as to be vertically movable. In the cover body 4, the opening 46 secured between the main leg portion 42 and the auxiliary leg portion 43 adjacent thereto functions as a ventilation hole.

The support 3 and the cover 4 described above are made of a molded body of synthetic resin such as polyethylene. Also,
As shown in FIG. 5, the cover body 4 includes the plate portion 41 and the main leg portion 4
2, 42 and the auxiliary leg portions 43, 43 are formed into a flat shape, and then the main leg portions 42, 42 formed as a hinge and the base portions 42a, 42a, 43a, 43a of the auxiliary leg portions 43, 43 are bent. is there. When the cover body 4 is manufactured by such a method, there is an advantage that the manufacturing cost of the cover body 4 is low.
The short tube 1 is also made of a molded body of synthetic resin such as polyvinyl chloride. In this embodiment, as the short pipe 1, a so-called U-shaped trap (shown as U-shaped trap B in FIG. 7) which is commercially available to be installed at a drainage port around a house is used. are doing. Furthermore, the valve body 2
A hollow spherical molded body made of a synthetic resin such as polyvinyl chloride or polyethylene is used for. A so-called ping-pong ball used in a table tennis game can be used as the valve body 2.

In the ventilation valve E thus constructed,
As in the case where no drainage is made from any of the drainage pipes C ... Connected to the upper and lower portions of the vertical pipe D shown in FIG. 7, the internal passages of the short pipe 1 and the vertical pipe D communicating with the valve chamber 5 are When the pressure is equal to the atmospheric pressure, the valve body 2 rides on the lower conical seat surface 34 of the support body 3 by its own weight and closes the valve hole 33.

When the internal passages of the short pipe 1 and the standing pipe E communicating with the valve chamber 5 are sucked due to drainage from any of the drain pipes C, the atmospheric pressure and the internal passages thereof are When the differential pressure is so small that the valve body 2 cannot be lifted up in the valve chamber 5 against its own weight, the valve body 2 is caused by its own weight to cause the valve body 2 to contract under the conical bearing surface 34 of the support body 3.
Ride on and keep the valve hole 33 closed. However, when the pressure difference between the atmospheric pressure and the internal passages thereof is large enough to lift the valve body 2 in the valve chamber 5 against its own weight, the valve body 2 goes below its own weight and falls below the support body 3. For example, as shown by the phantom line in FIG. 1, the seat surface 34 having a conical conical shape floats inside the valve chamber 5 to open the valve hole 33. Therefore,
The air F flows from the valve hole 33 through the valve chamber 5 into the internal passages of the short pipe 1 and the vertical pipe E, the water accumulated in the U-shaped trap B is sucked, and the water sealing action of the U-shaped trap B is impaired. Immediately before that, the suction effect caused by drainage is immediately eliminated. When the suction action is released, the valve body 2 rides on the seat surface 34 by its own weight and closes the valve hole 33.

Further, since the short pipe 1 has an inverted U shape, it is possible to prevent rainwater from falling into the internal passage of the vertical pipe E through the short pipe 1 during rainfall.

FIG. 6 shows a ventilation valve E according to another embodiment of the present invention as a vertical pipe D.
It is a vertical cross-sectional view showing a state of being installed on the upper end portion of. In this embodiment, the structure of the cover body 4 itself is different from that described with reference to FIGS. Cover body 4 of this embodiment
Is formed by integrally molding a lattice plate 47 having a plurality of openings 46 and a cylindrical portion 48 curved in an arc shape with a synthetic resin such as polyethylene. The falling portion 12 on one end side of the short pipe 1 is
Is fitted to the arc portion 14 adjacent to the. Other configurations are similar to those described in FIGS. 1 to 5, and
The same applies to the action and effect. Therefore, the same reference numerals are given to the same portions, and detailed description will be omitted.

Since all of the constituent parts of the above-described two embodiments of the vent valve E are made of synthetic resin molding, there is no risk of rusting, light weight and excellent handleability.
Moreover, it has the advantage of being inexpensive.

[0023]

According to the ventilation valve of the present invention, drainage is performed from individual drainage pipes connected to a plurality of upper and lower portions of a vertical pipe of a high-rise building, and the inside of the vertical pipe higher than the connection point of the drainage pipes is drained. Even if the passage becomes negative pressure, the negative pressure is immediately canceled by the action of the ventilation valve, so the water accumulated in the U-shaped trap interposed between the drain pipe and the water supply area is sucked. It is possible to prevent the situation in which the water sealing action of the water is impaired by being prevented, so that the original function required for the ventilation valve can be reliably exhibited, and the short pipe, the support body, and the valve body Since it is a cover body, the number of constituent parts is smaller than that of the conventional ventilation valve and the structure is simple, so that there is an advantage that not only maintenance is easy but also the price is low. Moreover, by making all the constituent parts, that is, the short pipe, the support body, the valve body, and the cover body all synthetic resin molded bodies, it becomes possible to provide an inexpensive vent valve having a long service life.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which a ventilation valve according to an embodiment of the present invention is installed at an upper end portion of a vertical pipe.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an explanatory diagram of a mounting portion between a support body and a cover body.

FIG. 4 is an exploded perspective view showing a support body, a valve body, and a cover body.

FIG. 5 is a development view of a cover body.

FIG. 6 is a vertical cross-sectional view showing a state in which a ventilation valve according to another embodiment of the present invention is installed at an upper end portion of a vertical pipe.

FIG. 7 is an explanatory diagram showing a location where a ventilation valve is installed.

[Explanation of symbols]

 C Drain pipe D Stand pipe E Vent valve 1 Short pipe 2 Valve body 3 Support body 4 Cover body 5 Valve chamber 12 Falling part 33 Valve hole 34 Seat surface 46 Opening (vent hole)

Claims (2)

[Claims] 1. An inverted U-shaped short pipe connected to an upper end of a standing pipe to which a drainage pipe extending from a water supply portion is connected and one end of which is open to the air, and a spherical valve body, A support provided with a downward conical seat surface having a valve hole having a diameter smaller than the diameter of the valve body provided in the falling portion on the one end side of the short pipe and having a diameter smaller than the diameter of the valve body in the center; A cover body that has an opening serving as a vent and that cooperates with the support body to form a valve chamber in which the valve body is vertically movably accommodated. 2. The vent valve according to claim 1, wherein the short pipe, the support and the cover are made of synthetic resin and the valve body is made of hollow synthetic resin.