JP3366595B2 - Vent valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation valve which is connected to a drainage ventilation pipe or the like to reduce a negative pressure generated in the pipe and which allows internal parts to be attached or detached for inspection or the like.

[0002]

2. Description of the Related Art This vent valve mainly sucks air during drainage without directly opening the end of an extension vent pipe installed inside a building to the atmosphere. A structure has been proposed.

First, the vent valve shown in FIG. 14 is provided with a groove 4 for collecting the condensed water in order to prevent the phenomenon that the opening / closing operation of the valve body 3 becomes impossible when the condensed water in the valve chamber 1 freezes. A flow path 6 that connects the groove 4 and the pipe-shaped body 5 is provided to allow the condensed water to escape into the body 5.
In this case, in order to form the concentric valve seats 2 and 7 into a simple annular circle, the flow path 6 is formed in a lateral hole shape.

Further, Japanese Patent Publication No. 1-37628 discloses that
An example in which the channel is formed in a groove shape other than the lateral hole shape as in the above example is disclosed, but in this case, a groove-shaped channel is formed in a lateral direction on a concentric valve seat. Since a part of the valve seat is cut by the groove-shaped flow path, the valve seat has a structure that is not a complete annular circle.

[0005]

In the former case, since the flow passage 6 has a lateral hole shape in order to secure an annular valve seat, a slide mold is required to mold the valve body with resin. Therefore, the die cost becomes high.
In addition, the housing 10 forming the valve chamber 1 must be divided below the flow path 6, and the fitting portion 8 of the body 5 and the housing 10 must be separated so that the divided portion will not be inadvertently disassembled during construction. Adhesive joining is required, which not only increases the number of steps, but also increases the cost, and the fitting portion 8
If the condensed water leaks from the joint portion or the condensed water freezes, the housing 10 may expand and leak from the joint portion. Further, since the fitting portion 8 is exposed to the outside of the heat insulating material 9, the airtightness may be deteriorated, and the valve body 3 may be actuated by a slight negative pressure, or odor may leak from this portion.

Further, according to the former example, the body 5 and the fitting portion 8 of the housing 10 are adhesively joined so as not to be disassembled carelessly during construction, so that internal components such as the valve body 3 are in use during use. It is not possible to take out and inspect it or perform repair work such as cleaning.

In the latter case, unlike the former example, the slide mold structure is not necessary, but since the elasticity of the rubber packing is used to seal only by the weight of the valve body, the valve seat Since the groove is provided in the lateral direction in the annular circle of
When the packing comes into contact with this portion, sufficient elastic deformation of the packing with respect to the valve seat is impeded, and thus the followability of the packing with respect to the valve seat deteriorates, and there is a problem that the sealability deteriorates.

Further, according to the latter example, although the cap can be detached from the housing, there is no disclosure of the means for attaching and detaching the cap and the technical matters regarding the sealing property between the cap and the housing, and tentatively. Even if the internal parts such as the valve body are taken out and inspected, the cap and the valve body do not have a follow-up means, and therefore the cap and the valve body need to be attached and detached individually, which is extremely troublesome. It has a defect.

On the other hand, when an instrument (ventilation valve) is installed at the end of an extension vent pipe in a building, an inspection port for inspecting this instrument must be provided. As described above, with the instruments, the disassembling work for the inspection cannot be performed, or the disassembling work can be extremely incomplete.

Therefore, recently, at the end of the ventilation pipe, a detachable tube tool is first provided, and an instrument (ventilation valve) is provided so as to be attached to and detached from this detachable tube tool. When repair work of the instrument is required,
Although the entire device is exchanged via this detachable tube tool, in this case also, the extra cost is required for the removable tube tool,
It was not a rational method.

The present invention has been developed as a result of intensive studies in view of the above-mentioned circumstances, and an object of the invention is to connect a cylindrical portion for connecting a shaft center of a valve chamber and a ventilation pipe for drainage. By eccentricizing the shaft center of (1), it is possible to form a flow path that connects the water collecting groove in the valve chamber and the connecting tube portion with a simple two-plate type mold structure, thereby reducing the manufacturing cost, and
It also provides a good sealing performance, no malfunction of the internal parts, and provides a ventilation valve that enables effective use of the installation space.The simple structure also facilitates disassembly of the internal parts. To do.

[0012]

In order to achieve the above object, the invention according to claim 1 is such that an annular valve seat is normally seated by its own weight in a valve chamber having inner and outer annular valve seats, and A valve body that opens in response to negative pressure by atmospheric pressure is provided, and a water collecting groove is formed outside the outer annular valve seat, while the valve chamber is located eccentrically to the axial center of the valve chamber. It is a vent valve which is provided with a connecting cylinder part which communicates, and which further forms a communication channel for communicating the water collecting groove with the inside of the connecting cylinder part along the axial direction of the valve chamber.

In this case, it is preferable that the water collecting groove and the portion where the inner diameter of the connecting cylinder portion are overlapped communicate with each other to provide a communication channel, and the water collecting groove is inclined downward along the communication channel. It is preferable to form it.

According to the second aspect of the present invention, the valve body having the valve chamber is detachably provided with a cap, and the valve body which is vertically movable in the valve chamber is seated on the annular valve seat in the valve chamber so as to be openable and closable. This valve element is normally provided with a valve element that is seated on the valve seat by its own weight and that is opened by atmospheric pressure in response to negative pressure.When the cap is attached and detached, the valve element is attached and detached with the cap. It is a vent valve that can.

In this case, it is preferable that the guide shaft of the cap is snap-fitted when it is inserted into the guide hole provided in the valve body so that the valve body engages when the cap is attached or detached.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a vent valve according to the present invention will be described in detail with reference to FIGS. This ventilation valve has the function of taking in air to smooth the flow of drainage in the drainage pipe and the function of preventing the odor leakage of sewage gas in the drainage pipe, which normally must be opened to the outdoors. The terminal opening of the device is a device that can be processed indoors. By using it, the protrusion at the end of the pipe is not exposed, so it does not spoil the appearance of the building,
There is an advantage that the ventilation work that penetrates the roof and outer walls can be simplified, and the ventilation pipe provided above the extension ventilation pipe that extends above the drainage stack of the building or in the middle of the horizontal drain pipe. It is intended to be used by attaching it vertically.

1 to 5 show an example of a vent valve according to the present invention. In FIG. 1, the valve chamber 10 is defined by a cylindrical portion 11 of a valve body 28, and is concentric with the cylindrical portion 11. The inner annular valve seat 12 and the outer annular valve seat 13 are formed in a shape. Further, a disc-shaped cap 14 is detachably provided in the upper opening 11a of the cylindrical portion 11, and a guide shaft 15 is formed so as to hang down in the center of the lower surface of the cap 14. Two radiating ridges 15a are formed. The valve body 28, the cap 14, and the elevating member 19 are made of synthetic resin in this example.

In the valve chamber 10, a valve body 16 is provided so as to be able to move up and down. Normally, the valve body 16 is seated on the annular valve seats 12 and 13 by its own weight, and when the inside of the pipe becomes a negative pressure, it responds to it. Then, it is lifted by the atmospheric pressure and opened. The valve body 16 may have any structure as long as it exhibits these functions, but the valve body 16 in this example has a circular guide hole 17 in the center as shown in FIGS. 1 and 2. And a mounting groove 19a is formed on the outer peripheral surface of a circular elevating member 19 having a plurality of communication holes 18, and an annular flexible member 20 formed of a material such as rubber is mounted in the mounting groove 19a. The circular guide hole 17 of the elevating member 19 is fitted with the guide shaft 15, and the valve body 16 moves up and down while being guided by the shaft 15, and the annular valve seat 1 is moved by its own weight.
The flexible member 20 is provided so as to be closed while being seated on the valve seats 2 and 13 while being pressed against the annular valve seats 12 and 13 so as to bend. Further, as shown in FIG. 1, the guide shaft 15 hangs down to a position lower than the annular valve seats 12 and 13, and the outer diameter of the flexible member 20 is
It is smaller than the inner diameter of the cylindrical portion 11 and is provided so as not to contact the cylindrical portion 11.

Further, an air inlet 21 communicating with the atmosphere is provided between the annular valve seats 12 and 13, and a plurality of holding pieces 22 are provided between the annular valve seats 12 and 13 in the radial direction. The holding piece 22 is provided at a low position so that the holding pieces 22 adjacent to each other communicate with each other as they flow toward a communication channel 23, which will be described later, so that air flows in.

Further, an annular water collecting groove 24 for collecting the condensed water in the valve chamber 10 is formed on the outer peripheral portion outside the outer annular valve seat 12, and the water collecting groove 24 is formed. , FIG. 4 and FIG.
As shown in, the structure is inclined downward along the communication flow path 23. Although the water collecting groove 24 has a water collecting function even when it is horizontal, the water collecting efficiency is improved by inclining the water collecting groove 24 as in this example. Further, when the upper end of the holding piece 22 on the communication flow path 23 side is provided below the upper end surfaces of the annular valve seats 12 and 13, it is possible to ensure the air permeability of this portion. Further, at a position eccentric to the axial center of the valve chamber 10,
A connecting cylinder portion 26 connected to the upper end of the drainage ventilation pipe 40 or the like via the valve chamber 10 and the communication cylinder portion 25 is integrally formed.

As shown in FIGS. 3 and 4, the communication flow path 23 has a crescent-shaped flow path hole 23a formed at one end side below the water collection groove 24 so that the water collection groove 24 and the connecting tubular portion are formed. The flow path is formed by communicating the overlapping portions of the inner diameter portions of 26. The communication flow path 23 is not limited to the structure of this example, and the communication flow path 23 may be formed at an appropriate position of the water collection groove 24 and a position where the inner diameter portion of the connection tubular portion 26 overlaps. Are optional depending on the implementation. Reference numeral 27 in the figure is a heat insulating material for covering the cylindrical portion 11 of the valve body 28.
Are provided to prevent condensation and freezing.

Next, the operation of the above embodiment will be described.
In FIG. 1, when the pressure in the drainage pipe 40 to be connected is the same as the atmospheric pressure, the valve body 16 has the valve seat 12, due to its own weight.
The flexible member 20 of the valve body 16 seats the air inlet 21 in a closed state.

Next, for example, when the water is drained after using a device such as a toilet bowl, the pressure in the valve chamber 10 becomes a negative pressure rather than the atmospheric pressure, and this negative pressure causes the seating surface of the valve body 10 due to its own weight. If it becomes larger than the above value, the valve body 16 is lifted by the atmospheric pressure to open the inflow port 21 and take in air, so that the loss of sealing water in the drain trap provided in the device is reduced and the seal is not broken. To do.

Next, when the internal pressure of the pipe becomes positive, the valve body 16 is seated and the inlet 21 is closed. Further, when cold / hot water is drained to a drain pipe or the like, dew condensation occurs inside the valve chamber 10 of the ventilation valve, and this dew condensation water falls from the inside of the valve chamber 10 to the water collecting groove 24 and is inclined. The water flows through the water collecting groove 24 and flows into the connecting tubular portion 26 from the communication flow path 23. Therefore, it is possible to reliably prevent the valve body 16 from being frozen due to the condensed water in the valve chamber 10 and becoming inoperable.

Further, since the communication flow path 23 for communicating the water collecting groove 24 and the inside of the connecting cylinder portion 26 is formed along the axial direction of the valve chamber 10, not only the condensed water easily flows down. When the vent valve is formed of synthetic resin, it can be formed by a simple two-plate mold, and the cylindrical portion 1 on the communication flow path 23 side
1 and the connecting cylinder part 26 can be molded in a linear state. In other words, since the cylindrical portion 11 on the communication flow path 23 side can be formed in a shape that does not protrude from the connecting tubular portion 26, when the drain pipe or the like is attached in contact with the wall surface, the connecting tubular portion 26 also contacts the wall surface. Since they can be connected in contact with each other, it is possible to obtain a ventilation valve that can effectively take up space.

6 to 13 show another example of the ventilation valve according to the present invention. The same parts as those in the above example are designated by the same reference numerals, and the overlapping parts will not be described. In FIG. 6, 29 is a valve main body, and this valve main body 29 has a cylindrical portion 1
A cap 14 having a guide shaft 15 hanging down from the first opening 30 is detachably provided while maintaining airtightness.

In the structure for attaching and detaching the cap 14, an annular flange 31 is formed on the outer edge portion, and a notch 32 for inserting a tool is formed in the flange 31, as shown in FIG. On the side surface of, an uneven annular engaging portion 33 is formed,
On the inner periphery of the opening portion 30, a concave and convex annular locking portion 34 that engages with the engaging portion 33 is provided, and the engaging portion 33 and the engaging portion 3 are provided.
The valve chamber 10 and the cap 14 are detachable from each other.
The cap 14 can be attached and detached while maintaining airtightness. As this attachment / detachment structure, an appropriate structure can be adopted, and for example, the airtightness can be maintained by the unevenness or the taper structure.

Further, when the guide shaft 15 provided on the cap 14 is inserted into the circular guide hole 17 of the elevating member 19,
The valve body 16 is provided so as to engage with a part of the cap 14 when the cap 14 is attached and detached by snap-fitting. This engagement structure is provided at a position that does not easily drop by the weight of the valve body 16 and is not affected by the lifting and lowering of the lifting member 19 when the valve body 16 is operated.

This engagement structure will be specifically described with reference to FIGS. A cutout groove 35 is formed at a position below the radial protrusion 15a located on the outer periphery of the guide shaft 15, and a protrusion 36 is provided on the lower outer periphery of the radial protrusion 15a.
When the guide shaft 15 is inserted into the guide hole 17, the insertion end of the guide shaft 15 bends in the centripetal direction when the guide shaft 15 is inserted. The guide hole 17 is provided by the protrusion 36 when the tip of the guide shaft 15 returns to the old position after the insertion.

Further, this example is similar to the above example, and the valve body 2
9 is integrally formed with a connection cylinder portion 38 connected to the upper end of the drainage ventilation pipe 40 and the like via the communication cylinder portion 37 at a position eccentric to the axis of the valve chamber 10. In this case,
As shown in FIG. 6, according to this example, since the communication cylinder portion 37 and the connection cylinder portion 38 are formed to have substantially the same inner diameter, the valve body 16 is not connected to the valve body 16 when the pressure in the pipe is atmospheric pressure or when positive pressure is generated. Is evenly pressed from the upper surface of the valve body, and when negative pressure is generated, the valve body 16
Atmospheric pressure is evenly applied to the lower surface of the valve body 16 so that the valve body 16 is smoothly lifted and opened to inhale air.

The ventilation valve in FIGS. 6 to 13 has the same function and effect as those of the examples shown in FIGS. 1 to 5, but in particular, the part of the function different from the above example will be described.

When inspecting the inside of the valve seat of the valve body 29 and the internal parts such as the valve body 16, the valve body 16 remains on the body side even if the cap 14 is removed in the examples of FIGS. When a tool is inserted into the cutout portion 32 of the cap 14 and the cap 14 is removed from the cylindrical portion 11, as shown in FIG.
Of the guide hole 1 provided on the elevating member 19 of the valve body 16
7, the valve body 16 can be pulled out at the same time as the cap 14 is taken out, and the inside of the valve body 29 can be inspected and washed, or the valve body 16 that is an internal part can be inspected or washed. You can On the other hand, the valve body 16 is placed in the valve chamber 10
When the cap 14 is mounted inside, the cap 14 is attached to the cylindrical portion 1 of the valve chamber 10.
The valve body 16 can be seated in an appropriate position only by attaching the valve body 16 to the valve body 29.
Can be installed easily and securely while maintaining airtightness in the upper opening of the.

The structure for attaching and detaching the cap 14 to the guide shaft 15 and the valve body 29 and the structure for engaging the cap 14 and the valve body 16 shown in FIG. 6 can be applied to each example of the present invention.
Of course, it can be widely applied to the ventilation valve having the structure shown in the above-mentioned conventional example. And this vent valve
Since the valve chamber 10 is located on the side of the valve bodies 28 and 29 and has the valve bodies 28 and 29 and does not have the cap 14 during handling, it does not accidentally disassemble even if the cap 14 is not adhered. On the other hand, the cap 14 can be removed for inspection.

[0034]

As is apparent from the above, according to the present invention, when molding with a synthetic resin, it is possible to mold with a simple two-plate type mold, which reduces the cost of mold, In addition, since the valve chamber does not need to be formed by a separate housing or the like and is not inadvertently disassembled, adhesive bonding is unnecessary, and the number of steps and costs are reduced accordingly.

Further, by integrating the entire structure including the valve chamber, it is possible to consolidate parts having a large shape into one and reduce the die cost. Further, the joint portion of the valve chamber is Since it is located at the upper end, there is no risk of dew condensation water leaking, and since the joint part of the valve chamber is covered with the inside of the heat insulating material, airtightness is enhanced, and there is no risk of malfunction or odor leakage at a slight negative pressure.

Moreover, the annular valve seat can secure a perfect annular circular shape, and therefore the flexible member of the valve body can follow easily.
Since the sealing performance is exhibited reliably, there is no concern about odor leakage.

Furthermore, since the ventilation valve of the present invention can be joined to the upper end of the ventilation pipe in the state of being close to the wall surface, the drainage stack pipe and the ventilation pipe can be installed near the wall surface. The installation space can be used effectively. In particular, when joining the ventilation valve in the present invention to the upper end of the drainage ventilation pipe or the like, it is possible to set the ventilation valve at an appropriate position while adjusting the position thereof, and thus avoid the influence of obstacles such as the concealing portion. You can

Further, by removing the cap, the internal parts of the valve main body can be taken out, and the internal parts such as the valve body and the inside of the valve main body can be inspected and cleaned. Ventilation valve can be used, and it is possible to obtain a ventilation valve with excellent economical efficiency without extra cost. Furthermore, since the valve body is pulled up together with the cap when the cap is removed, inspection work in a narrow installation place becomes easy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which a ventilation valve showing an example of the present invention is closed.

FIG. 2 is a vertical sectional view showing a state in which a ventilation valve in FIG. 1 is opened.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a partially cutaway perspective view showing a state in which a portion AA in FIG. 3 is cut, as seen from a perspective direction.

FIG. 5 is a development view showing a state where half of the water collection groove is developed.

FIG. 6 is a ventilation valve showing another example of the present invention and is a vertical cross-sectional view of the ventilation valve.

7 is a vertical cross-sectional view showing a state in which the ventilation valve of FIG. 6 is opened.

FIG. 8 is a sectional view taken along line BB in FIG.

9 is a partially cutaway vertical sectional view showing a state in which a cap is removed from the ventilation valve in FIG.

FIG. 10 is a half cross-sectional view of the cap shown in FIG.

11 is an enlarged view of a part of FIG. 10 notched.

12 is a cross-sectional view taken along the line CC of FIG.

13 is a left side view of the ventilation valve shown in FIG.

FIG. 14 is a vertical cross-sectional view showing an example of a conventional ventilation valve.

[Explanation of symbols]

10 valve chamber 12, 13 Annular valve seat 16 valve body 23 communication channels 24 Water collection ditch 26 Connection tube 28, 29 valve body

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-53-7838 (JP, A) JP-A-55-63072 (JP, A) JP-A-7-119854 (JP, A) JP-A-9- 292045 (JP, A) JP 10-89514 (JP, A) JP 10-339380 (JP, A) Actually opened 59-112754 (JP, U) Actually opened 5-90065 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 24/00

Claims (5)

(57) [Claims] 1. A valve body, which is normally seated on the annular valve seat by its own weight and which is opened by atmospheric pressure in response to a negative pressure, is provided in a valve chamber having inner and outer annular valve seats, and an outer annular valve. A water collecting groove is formed on the outside of the seat, and on the other hand, a connecting cylinder portion communicating with the valve chamber is provided at a position eccentric to the axial center of the valve chamber. A ventilation valve, wherein a communication flow path for communicating with and is formed along the axial direction of the valve chamber. 2. The ventilation valve according to claim 1, wherein the water collecting groove and a portion where the inner diameter of the connection tubular portion overlaps are communicated with each other to provide a communication passage. 3. The ventilation valve according to claim 1, wherein the water collecting groove is formed so as to be inclined downward to reach the communication channel. 4. A valve main body having a valve chamber is detachably provided with a cap, and a valve element provided in the valve chamber so as to be movable up and down is seated on an annular valve seat in the valve chamber so as to be openable and closable. Is mounted on the valve seat by its own weight and opened by the atmospheric pressure in response to the negative pressure, and when the cap is attached and detached, the valve body can be attached and detached with the cap. Vent valve. 5. The vent valve according to claim 4, wherein the guide shaft of the cap is snap-fitted when the guide shaft is inserted into the guide hole provided in the valve body so that the valve body engages when the cap is attached and detached.