JP3795293B2 - Ventilation valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vent valve that is connected to a drain vent pipe or the like to reduce negative pressure generated in the pipe, and relates to a vent valve that can be inspected by detaching internal components.
[0002]
[Prior art]
Ventilation valves do not directly open the ends of the elongated vent pipes installed in the building to the atmosphere, but mainly suck air during drainage. The body body and the cap constituting the chamber are adhesively fitted to form an integrated structure.
[0003]
After connecting the vent valve to the end of the extension vent pipe, various problems occur over time.For example, condensed water accumulated in the vent valve leaks and odor leaks, etc. The valve body in the valve is affected by the outside air, the airtightness is reduced, and malfunctions such as the valve body operating with a slight negative pressure occur, making it difficult to fully function as a vent valve There was.
When these problems occur in the vent valve, the entire vent valve is replaced. For this reason, an example in which a detachable joint is added to the pipe connection portion between the vent valve and the vent pipe has also been proposed. ing.
[0004]
On the other hand, for example, there is a safety valve disclosed in Japanese Patent Publication No. 1-37628. This safety valve is provided with a cap fitted to the cylinder of the valve so that the cap can be removed from the cylinder.
[0005]
In addition, the connecting valve disclosed in Japanese Patent Publication No. 1-35235 has a structure in which a pipe connector is provided so as to extend from the connecting valve body, and the pipe connector and an external flow path are joined by screwing.
[0006]
[Problems to be solved by the invention]
However, the above vent valve cannot be used for inspection and other maintenance of the valve mechanism in the valve, and the entire valve mechanism that can be used continuously is replaced. It was expensive.
Moreover, since it is necessary to add a detachable joint, the cost is further increased, and the installation space is limited by this valve structure.
[0007]
In terms of sealing performance, the cap and body for sealing the inside of the valve are often fixed only by snap-fit and point bonding. In this case, the cap and body can be fixed by attaching and detaching the valve body and the vent pipe. If there is a gap in the fitting part of the product, or if distortion occurs when molding the cap and body, a space may be created when the cap is fitted. It was difficult to seal stably.
[0008]
In addition, the connecting valve disclosed in Japanese Examined Patent Publication No. 1-35235 must be replaced together with the joint of the pipe connector when the necessity for replacement occurs due to internal wear or the like. It was.
Furthermore, since this connecting valve has a screw connection part at the lower part of the outer ring and in the vicinity of the valve seat, when the condensed water leaks from the connection part or the condensed water freezes, the outer ring expands. There was a risk of leakage from the joint.
[0009]
The present invention has been developed as a result of intensive studies in view of the above circumstances, and the object of the present invention is to clean the mechanism inside the valve without having to replace the valve when the valve is exhausted. In addition to being a ventilation valve that can be easily replaced, it is an object of the present invention to provide a ventilation valve that has particularly good sealing properties and a small installation space.
[0010]
[Means for Solving the Problems]
To achieve the above object, the invention according to claim 1, in vent valve for reducing the negative pressure generated in the tube, a valve body having an air inlet which communicates with the atmosphere a valve chamber and the valve chamber the air inlet is provided between the annular valve seat spaced inner and outer circle center shaped spacing, although normally seated on the annular valve seat, a valve that opens in response to a negative pressure in the tube e Bei body, before the valve chamber of Kiben body detachably attached to the valve body via the engagement means provided with a cap for the lid to the valve body upper portion, said outer annular valve seat outward of the valve An annular water collecting groove is formed in the chamber, and a connecting tube portion is provided integrally below the valve chamber, and the communication channel provided along the axial direction in the connecting tube portion communicates with the water collecting groove. A vent valve.
[0011]
Furthermore, a seal member such as an O-ring was attached to the annular contact surface between the cap and the valve chamber peripheral surface.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An example of an embodiment of a vent valve in the present invention will be described in detail with reference to FIGS.
The vent valve used in the present invention has a function of taking in air for facilitating the flow of drainage in the drainage pipe and a function of preventing odor leakage of sewage gas in the drainage pipe. It is a device that allows the end opening of the vent tube to be handled indoors. Since the projections at the end of the pipe are not exposed by use, there are advantages such as not impairing the aesthetics of the building and simplifying the ventilation work that penetrates the roof and outer wall. It is used by attaching to the upper part of the extended top ventilation pipe extended in the upper part or the ventilation pipe provided in the middle of the drainage horizontal branch pipe in a vertical state.
[0013]
Here, the structure of the vent valve in the present invention will be described. 1 to 7 show an example of a vent valve according to the present invention. In FIG. 4, the valve chamber 10 is defined by a cylindrical portion 11 of a valve main body 28 and is concentrically formed inside the cylindrical portion 11. The annular valve seat 12 and the outer annular valve seat 13 are formed. Each of these valve seats forms a complete ring.
In addition, 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 in a hanging manner at the center of the lower surface of the cap 14, and the guide shaft 15 has 4 in the radial direction. Two radial protrusions 15a are formed. The valve body 28, the cap 14, and the elevating member 19 are made of synthetic resin in this example.
[0014]
A valve body 16 is provided in the valve chamber 10 so as to be movable 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 negative pressure, the valve body 16 becomes large in response. It is provided so as to be lifted and released by atmospheric pressure. The valve body 16 may have any structure as long as it exhibits these functions. However, the valve body 16 in this example has a circular guide hole 17 at the center as shown in FIGS. A mounting groove 19a is formed on the outer peripheral surface of a circular lifting member 19 having a plurality of communication holes 18, and an annular flexible member 20 formed of a material such as rubber is attached to the mounting groove 19a. The guide shaft 15 is fitted in the circular guide hole 17 of the elevating member 19, and the valve body 16 moves up and down while being guided by the shaft 15, and is seated on the annular valve seats 12 and 13 by the weight of the valve body 16. In this case, the valve is closed while the flexible member 20 is pressed against the annular valve seats 12 and 13. Further, as shown in the figure, the guide shaft 15 is suspended to a position below the annular valve seats 12 and 13, and the outer diameter of the flexible member 20 is smaller than the inner diameter of the cylindrical portion 11. The cylindrical portion 11 is provided so as not to contact the cylindrical portion 11.
[0015]
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.
[0016]
Further, an annular water collecting groove 24 for collecting condensed water in the valve chamber 10 is formed in the outer peripheral portion which is the outside of the outer annular valve seat 13. In this example, the communication flow path 23 is formed. However, it may be provided horizontally or at a position eccentric to the axial center of the valve chamber 10 through the valve chamber 10 and the communication tube portion 25. The connecting tube portion 26 connected to the upper end of the trachea 36 is integrally formed, but a valve chamber formed on the shaft center as usual may be used, and these are optional depending on the implementation. .
[0017]
The cap 14 that seals the valve chamber 10 of the vent valve of the present invention has an annular flange 31 on the upper outer edge and a convex protrusion 33 on the outer peripheral side surface. Further, an L-shaped notch engaging portion 34 that can be engaged with the projecting portion 33 is formed on the inner periphery of the cylindrical portion 11 near the upper opening 11 a, and the projecting portion 33 is attached to and detached from the engaging portion 34. It is possible.
[0018]
This engaging means will be specifically described with reference to the drawings.
The locking portion 34 includes a guide groove 34a and a fixing groove 34b, and is a groove that is provided in the inner peripheral surface of the cylindrical portion 11 in a concave shape. Among these, the guide groove 34a is provided so that the protrusion 33 can be inserted in the hanging direction from the opening 11a side of the cylindrical portion 11a, and the fixing groove 34b is a protrusion inserted into the guide groove 34a. The part 33 is formed so as to be rotatable, and the rotated projection 33 is guided so as to be fixed.
[0019]
As shown in FIG. 7, when the protrusion 33 is fixed to the fixing groove 34b, the protrusion 33 is locked in the vertical direction, and when the cap 14 and the upper opening 11a are fixed, the valve chamber 10 is fixed. Since the sealing member 35 (O-ring) is attached to the concave portion 14a of the cap 14 in order to maintain the inner sealing performance, the sealing member 35 comes into close contact with the inside of the opening 30 by the rotation of the cap 14, so that the cap 14 Can be secured to the cylindrical portion 11 and kept sealed.
[0020]
The cap 14 is attached / detached using a hook portion 14b that is radially formed in a rib shape on the top surface of the cap 14. For example, when removing the cap 14, the hook portion 14b is first pressed with a palm. However, in this example, the cap 14 is rotated about 10 ° to remove the fixed state of the projection 33 and the fixing groove 34b, and then pulled up in a substantially vertical direction while pressing the outer periphery of the cap 14 with a fingertip. As a result, the protrusion 33 of the cap 14 can pass through the guide groove 34a and the protrusion 33 can be removed. Since the engaging means in this embodiment is provided in the upper part of the valve main body 28, the cap 14 can be removed without worrying that the condensed water collected in the collecting groove 24 leaks to the outside, and the condensed condensation collected. Even when water freezes, the cap can be attached and detached without being affected by the effect.
[0021]
In the present embodiment, the guide shaft 15 is provided with a snap portion 15 b at the tip portion, and is snap-fitted when the guide shaft 15 is inserted into the circular guide hole 17 of the elevating member 19. When the cap 14 is attached to or detached from the cylindrical portion 11, the snap portion 15 b is locked to the guide hole 17, so that it does not fall off from the guide shaft 15 due to its own weight. Thereby, when inspecting the inside of the valve main body 28 and internal parts such as the valve body 16, the valve body 16 can be pulled out simultaneously with the removal of the cap 14, and the inspection can be easily performed. Regardless of this, the valve body 16 may remain on the main body side when the cap 14 is attached or detached.
The above-described engaging means is only an example, and includes a structure in which a cap is screwed into and removed from the valve chamber.
[0022]
Next, the operation of the above embodiment will be described.
In the vent valve of this example, a locking portion 34 is provided on the inner peripheral surface of the cylindrical portion 11 of the valve body 28, and the convex protrusion 33 on the outer peripheral surface side of the cap 14 is attached to and detached from the substantially L-shaped locking portion 34. Since the cap 14 is provided, the cap 14 can be easily removed, and the internal parts of the valve body 28 and the internal parts of the valve body 16 can be cleaned and replaced.
[0023]
Moreover, since the recessed part 14a is provided in the lower outer periphery of the cap 14, and the sealing member 35 is provided in this recessed part 14a, the cap 14 adheres to the opening part 30 of the valve main body 28 at the time of attachment or detachment, and seals in the valve chamber 10. The cap 14 is rotated and attached to the valve body 28, so that a higher sealing performance can be maintained and a stable fastening state can be maintained. I can keep it.
[0024]
Furthermore, when the cap 14 and the valve body 16 are snap-fitted, when checking the inside of the valve body 28 or the internal parts such as the valve body 16, the conventional vent valve can be operated even if the cap 14 is removed. Although the body 16 remains on the main body side, according to the vent valve of this example, when the cap 14 is rotated in the direction of the arrow in FIG. 6 using the hook portion 14b and removed from the cylindrical portion 11, the snap portion 15b of the guide shaft 15 is removed. Engages with the guide hole 17 provided in the elevating member 19 of the valve body 16, so that the valve body 16 can be pulled out simultaneously with the removal of the cap 14, and the inside of the valve body 28 can be inspected and cleaned, The valve body 16 which is an internal part can be inspected or cleaned. On the other hand, when the valve body 16 is mounted in the valve chamber 10, the cap 14 can be mounted along with the mounting of the cap 14 to the cylindrical portion 11 of the valve chamber 10, and the protrusion 33 is aligned with the locking portion 34. Since the valve body 16 can be seated at an appropriate position simply by rotating the cap 14 using the hanging portion 14b in the state, the cap 14 is excellent in detachability, and when a malfunction occurs or the valve mechanism portion is inspected. It is possible to easily remove deposits such as dust, and to clean.
[0025]
Moreover, since the recessed part 14a is provided in the outer periphery of the lower part of the cap 14, and the sealing member (O-ring) 35 is provided in this recessed part 14a, the cap 14 closely_contact | adheres to the opening part 30 of the valve main body 28 at the time of attachment or detachment. It is possible to easily and surely attach and detach while maintaining the internal sealing performance, and furthermore, since the cap 14 is rotated and attached to the valve body 28, higher sealing performance can be maintained.
[0026]
In addition to this example, the attachment / detachment structure according to the present invention is provided with a convex or concave portion on the outer periphery of the cap 14 and is rotated so as to be engaged with the concave portion or the convex portion provided on the inner periphery of the valve body 28. And can be attached or detached by screwing means or the like. Furthermore, if the sealing performance within the valve chamber 10 is maintained by the seal member 35, the cap 14 and the valve main body 28 can be attached and detached using various engaging means in addition to the attaching and detaching means by rotating operation. .
[0027]
In the above vent valve, the valve main body 28 and the cylindrical portion 11 are formed in an eccentric state. However, the present invention is not limited to this, and the valve main body and the cylindrical portion are concentric. It can be applied to examples of conditions or other various vent valve structures, and the structure is arbitrary depending on the implementation.
[0028]
【The invention's effect】
As is clear from the above, the vent valve of the present invention does not need to be replaced when the valve is exhausted, and is very easy to disassemble and assemble, and easy to clean and replace the internal mechanism of the valve. In addition, a vent valve that can provide a small installation space can be obtained with a small number of parts and good sealing performance.
In addition, the vent valve of the present invention is a vent valve that does not leak the collected condensed water to the outside, and can be decomposed without being affected even when the collected condensed water is frozen. Obtainable.
[Brief description of the drawings]
FIG. 1 is a perspective view of a vent valve showing an example of the present invention.
FIG. 2 is an enlarged cross-sectional view of the ventilation valve of FIG. 1 with a part cut away.
FIG. 3 is a reference diagram showing an assembled state of the vent valve of FIG. 1;
FIG. 4 is a longitudinal sectional view of a vent valve according to the present invention.
FIG. 5 is a longitudinal sectional view of a vent valve according to the present invention.
FIG. 6 is a partially enlarged cross-sectional view showing the vicinity of a locking portion.
7 is an explanatory view showing a state where the cap of FIG. 6 is rotated. FIG.
[Explanation of symbols]
10 Valve chambers 12, 13 Annular valve seat 14 Cap 21 Air inlet 28 Valve body

Claims (1)

Ventilation valve for reducing negative pressure generated in a pipe, comprising a valve body having an air inlet for communicating the valve chamber and the valve chamber with the atmosphere, and the air inlet has inner and outer concentric intervals. provided between the annular valve seat placed, it is usually seated on the annular valve seat, e Bei the valve body to open in response to a negative pressure in the tube to the lid of the valve chamber before Kiben body A cap is detachably provided on the valve body via an engagement means provided on the upper part of the valve body, and an annular water collecting groove is formed in the valve chamber outside the outer annular valve seat. A vent valve characterized in that a connecting cylinder is integrally provided below, and a communication channel provided in the axial direction in the connecting cylinder and the water collecting groove communicate with each other.

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