WO2018169075A1

WO2018169075A1 - Aeration valve and waste water pipe system

Info

Publication number: WO2018169075A1
Application number: PCT/JP2018/010590
Authority: WO
Inventors: 青木　和弘; 浩小幡; 達朗小林
Original assignee: 株式会社キッツ
Priority date: 2017-03-17
Filing date: 2018-03-16
Publication date: 2018-09-20
Also published as: CN110392800B; CN110392800A

Abstract

Provided is an aeration valve: which has a simple configuration and thus can be installed substantially in the same space as an aeration pipe without requiring to be increased in the pipe diameter direction; which, at atmospheric pressure or at positive pressure, exhibits high sealing properties while maintaining closed valve conditions; in which, in case of negative pressure, a valve element operates with high responsiveness in conditions of low aeration resistance and a big quantity of evacuated air; and which can reliably settle the negative pressure while suppressing chattering phenomenon. Also provided is a waste water pipe system.　The aeration valve is installed so as to be able to open and close by means of a circular plate valve body (23) incorporated in a pipe main body (20) so as to rotate around an axis of rotation (24). The circular plate valve body (23), in case of negative pressure in the pipe main body (20), generates an unbalanced torque that rotates in the opening direction via the axis of rotation (24), and allows admission of air from the outside. In the pipe main body (20), at atmospheric pressure or positive pressure, an unbalanced torque is generated and rotates in the closing direction via the axis of rotation (24) and closes the valve.

Description

Ventilation valve and drain pipe system

The present invention relates to a vent valve and a drain pipe system that is connected to a drainage facility and eliminates negative pressure generated in the drain pipe.

Conventionally, in drainage facilities for buildings such as individual houses and apartment houses, drainage pipes using vent valves are used to eliminate negative pressure in the drainage pipes and to smoothly drain water while protecting trap seals in drainage equipment. The system is generally known.

As a vent valve used in this type of drain pipe system, for example, a safety valve of Patent Document 1 is disclosed. In this valve, two concentric valve seats are provided in the inner chamber in the housing connected to the vent pipe, and a valve body in which an annular seal member is attached to the hub moves up and down relative to the valve seat. An intake passage between the valve seats is provided in a structure that can be opened and closed by an annular seal member.
During the operation of the valve, the valve body is normally seated on the valve seat by its own weight, and the closed state of the vent pipe is maintained. On the other hand, when negative pressure is generated in the drain pipe, the valve body lifts against its own weight due to the pressure difference from the atmosphere, and the air is taken into the drain pipe through the vent valve that is open. As a result, the negative pressure is reduced.

In the intake / exhaust valve of Patent Document 2, an intake valve port is provided in a lid receiving frame provided at the upper end of a ventilation riser pipe, and the intake valve body is connected to the intake valve port via a spring formed of a compression spring. It has a structure that is provided so as to be movable in a state in which a bullet is energized in the closing direction.
In this intake / exhaust valve, the intake valve body is normally moved in the urging direction by the spring force of the spring and is seated on the intake valve port to maintain the valve closed state. On the other hand, when negative pressure is generated in the drain pipe, ventilation is performed by moving the intake valve body in a direction that resists the spring biasing force of the spring.
Furthermore, there are also vent valves that adopt a structure that opens the valve by the weight of the valve body and that are closed using the elastic force of the compression spring, or a structure that uses a tension spring as a spring. Proposed.

Further, in the venting device of Patent Document 3, an air introduction portion sandwiched between the inner annular valve seat portion and the outer annular valve seat portion is provided inside the vent pipe, and the oblique valve seat surface of the air introduction portion is provided on the inclined valve seat surface. A valve body having a seat seat packing that can be seated is rotatably provided by a cantilever support via a bearing portion.
In the case of this ventilation device, normally, the valve body rotates around the bearing portion by its own weight and is seated on the valve seat so that the valve is closed. On the other hand, when the drain pipe has a negative pressure, the valve body is rotated around the bearing portion due to the differential pressure, and the valve is opened to reduce the negative pressure.

In the vent valve of Patent Document 4, a main body in which a connection port connected to a drain pipe and a vent hole for introducing outside air are formed, a valve body that can be opened and closed by negative pressure in the drain pipe, a magnet, A pair of magnets or a magnet and a magnetic body is provided, and the valve body is repelled by these magnetic forces so that the vent is closed.

JP-B-1-37628 Japanese Patent Laid-Open No. 2001-140313 Japanese Patent No. 3490413 Japanese Patent No. 5054620

In the case of the vent valve having the structure of Patent Document 1, since the intake flow path is disposed on the side of the larger diameter (outer diameter) than the vent pipe, the installation space for the vent valve is required more than the piping space of the vent pipe. It becomes. On the other hand, when the outer diameter of the vent valve is set to a diameter equivalent to that of the vent pipe, there is a possibility that the amount of ventilation is insufficient because the valve diameter is small.
In addition, this vent valve has a structure in which the vent route when the valve is opened is bent into a substantially U shape that is folded back from the valve seat position of the valve body, and the vent resistance is larger than that of the straight vent route. Therefore, when the ventilation valve is made compact, the ventilation amount tends to be insufficient. If the intake flow path is widened to the enlarged diameter side and provided with a shape that secures the air flow, the entire vent valve is further enlarged in the pipe diameter direction. As described above, in the vent valve having this structure, it is difficult to reduce the negative pressure smoothly by sufficiently securing the intake flow path while suppressing the pipe diameter to be equal to or smaller than that of the vent pipe.
Furthermore, since the valve opening operation is started after the valve chamber provided in the upper part of the valve body is in a negative pressure state, the responsiveness to the generation of the negative pressure may be deteriorated.

In addition to this, since the valve body has a structure in which the valve body is closed by its own weight, the valve closing force, that is, the force acting in the valve closing direction, depends on the valve body's own weight, and the valve body regardless of the valve opening degree. The magnitude of the closing force becomes a constant value, making it difficult to adjust the response to negative pressure.
In other words, when the negative pressure is generated, the valve body rises and ventilates, and a slight amount of lift of the valve body secures a cylindrical ventilation area corresponding to the valve aperture area, thereby relaxing the negative pressure. In the negative pressure relaxation process, the valve body tends to descend in the valve closing direction, but the flow of drainage in the drain pipe continues for a while depending on the use status of drainage equipment such as toilets and washstands, and the flow is constant. Therefore, the negative pressure is attenuated while changing. When the force by which the valve body is lifted by this negative pressure, that is, the valve opening force is larger than the valve closing force due to the weight of the valve body, the valve body rises again against this valve closing force. In this way, in the case of a vent valve that closes only by its own weight, only a constant valve closing force due to its own weight works when the valve is open, so when the negative pressure changes, It becomes difficult for the body to maintain a constant open state.

As a result, the valve body repeatedly rises (valve opening operation) and descends (valve closing operation) due to minute changes in negative pressure, so that the so-called chattering phenomenon that the valve body frequently contacts the valve seat is likely to occur. Become. Then, the valve opening tends to fluctuate due to pressure fluctuation in the drain pipe, the balance of force in the lifting direction at the time of valve opening suddenly collapses and the force in the valve closing direction works, and the valve closing action is caused by the weight of the valve body Momentum can be strong.

In the case of a structure in which a compression spring is mounted on a valve body as in Patent Document 2, the valve closing force is further increased by applying the elastic force of the compression spring in addition to the weight of the valve body when fully closed. Thereby, when negative pressure is generated, the elastic force of the compression spring increases proportionally as the valve opening increases, and the valve closing force increases proportionally. As a result, it is easy to close the valve body easily before the negative pressure is completely eliminated from the intermediate opening or fully open, and the momentum of this valve closing operation becomes stronger with the compression spring, and the responsiveness to the negative pressure generation is poor. Become.

In particular, if the negative pressure in the drain pipe is very small, the valve body operation becomes unstable, and chattering is likely to occur by frequently opening and closing operations. The same applies to vent valves that use tension springs.If chattering occurs in vent valves that use these springs, there is a possibility that loud noise may occur due to intense vibrations of the valve body. Therefore, it may be necessary to finely adjust the spring constant or provide a braking structure.

In these ventilation valves, when the intake valve body moves in the opening and closing direction along the ventilation route in the intake valve port, the ventilation resistance is increased by the intake valve body located in this ventilation route, and the ventilation valve is made compact In some cases, the air flow rate when the valve is opened may be insufficient.

Further, in the venting device of Patent Document 3, since the cantilevered bearing portion protrudes on the larger diameter side than the vent pipe, it is difficult to make it compact, and a radial installation space larger than the vent pipe is required. When this ventilator is in operation, venting is started only when negative pressure is generated not only in the vent pipe but also in the valve chamber above the valve body. is doing. Furthermore, since the air introduction part which is an air intake port is provided between the inner annular valve seat part and the outer annular valve seat part, there is a possibility that the ventilation amount at the time of ventilation is insufficient.

The ventilation route when the valve is opened is bent between the inner annular valve seat portion and the outer arc valve seat portion into a substantially U-shape that is folded back from the valve seat position. The air flow rate is likely to be insufficient to achieve compactness.

Furthermore, the valve closing force becomes a rotational moment based on the weight of the valve body and the distance from the rotational axis of the valve body center of gravity, and this valve closing force decreases as the opening of the valve body increases, Become the largest. For this reason, when the negative pressure is eliminated from the intermediate opening or the fully open state, the valve body is likely to close at an accelerated speed, and chattering is likely to occur.
In this case, for example, if the valve opening increases to the vicinity of the fully open angle of the valve body, it becomes difficult to close the valve when the negative pressure is eliminated. For example, if the valve opening exceeds 70%, the negative pressure decreases. It becomes difficult to quickly close the valve. In this way, since the fully open valve body has a structure that inhibits the reduction of negative pressure, it is necessary to set the vent diameter to a large diameter in order to secure the ventilation volume, and the overall size is also increased. Connected.
On the other hand, since it is necessary to perform the valve opening operation even when a minute negative pressure is generated in a valve closed state where the rotational moment is the largest, chattering is likely to occur due to the change in the negative pressure. At that time, even if a weight adjusting material is attached to the valve body, it is difficult to prevent chattering when the valve is slightly opened.

In the case of the vent valve of Patent Document 4, it is necessary to adjust the interval between magnets to adjust the responsiveness of the valve body to an appropriate state with respect to negative pressure. In this case, it takes time and effort to rotate the lid screwed to the main body and necessitate fine adjustment of the gap between the magnet mounted on the main body side and the magnet mounted on the lid side. If the interval is not appropriate, chattering may occur. Since a plurality of magnets are required, the number of parts is increased, and the internal structure is complicated to attach the magnets.

The present invention has been developed to solve the conventional problems, and the object of the present invention is to prevent the enlargement in the pipe radial direction with a simple configuration and to be installed in the same piping space as the vent pipe. Yes, maintains the valve closed state while exhibiting high sealing performance at atmospheric pressure or positive pressure, and operates the valve body with high responsiveness while keeping large ventilation volume while keeping ventilation resistance small when negative pressure occurs Accordingly, it is an object of the present invention to provide a vent valve and a drain pipe system that reliably eliminates negative pressure and maintains a valve body in a stable state against changes in negative pressure to suppress chattering.

In order to achieve the above object, the invention according to claim 1 is provided so as to be openable and closable by a disc-like valve body rotatably incorporated in a cylinder body via a rotary shaft. , Generates an unbalanced torque that rotates in the valve opening direction through the rotating shaft during negative pressure in the cylinder body, and allows air to be sucked in from the outside, and the rotating shaft when the cylinder body is at atmospheric pressure or positive pressure This is a vent valve configured to generate an unbalance torque that rotates in the valve closing direction through the valve to bring the valve into a closed state.

In the invention according to claim 2, the rotating shaft is an eccentric shaft having a double eccentric structure in which the rotating shaft is doubly eccentric, and the pressure receiving area of the disc-shaped valve element is a large pressure receiving surface with the axis of the rotating shaft as a boundary. This is a vent valve comprising a small pressure receiving surface.

The invention according to claim 3 is a vent valve in which the eccentric shaft can adjust the vent valve function by appropriately setting the eccentric amount by changing the eccentric distance.

In the invention according to claim 4, the valve-closed state of the disc-shaped valve body is maintained by making the weight of the valve body on the small pressure receiving surface side heavier than that on the large pressure receiving surface side with respect to the eccentric shaft. This is a vent valve.

The invention according to claim 5 is a vent valve in which a weight portion is provided on the rotating shaft, and the weight of the valve body on the small pressure receiving surface side is made heavier than that on the large pressure receiving surface side.

The invention according to claim 6 is a vent valve in which the vent function can be adjusted by appropriately setting the weight amount and position of the weight portion.

In the invention according to claim 7, the valve seat surface mounted on the inner peripheral surface of the cylinder main body is a reduced diameter tapered surface or a rounded curved surface, and the valve seat contact surface of the disc-shaped valve body is a spherical surface. It is a vent valve provided in a state in which the valve seat surface and the disc-shaped valve body can come into contact with each other by line contact.

In the invention according to claim 8, a drainage pipe insertion port for connecting an external drainage pipe is provided in the cylinder body, and the drainage pipe insertion port is formed to be transparent or translucent so that the adhesive state with the external drainage pipe is visually recognized. It is a vent valve provided.

According to the ninth aspect of the present invention, in the vent valve, the rotation shaft is provided in the vicinity of the inner periphery of the cylinder body, and the disc-like valve body is provided to be freely opened and closed via an arm member provided on the rotation shaft. It is a vent valve.

The invention according to claim 10 is a vent valve in which a stopper seal ring for closing the disc-like valve body is provided in the cylinder body.

According to the eleventh aspect of the present invention, the rotary valve body for the vent valve has a rotation moment that rotates in the valve opening direction and a rotation moment that rotates in the valve closing direction, and the rotary valve body can exhibit a vent valve function. This is a vent valve.

According to a twelfth aspect of the present invention, the rotary valve body is a vent valve in which a rotational moment in the valve opening / closing direction is given via a fulcrum in the cylinder body.

The invention according to claim 13 is a vent valve in which a rotary valve body that is opened by its own weight is maintained in a closed state by balancing with a weight portion.

The invention according to claim 14 is the vent valve in which the fulcrum is an eccentric shaft having a double eccentric structure eccentrically doubled.

According to the fifteenth aspect of the present invention, the maximum angle of the rotating valve body when the valve is opened is a valve opening restriction that is a position where the rotating valve body can return to the valve closed state in balance with the weight when the negative pressure is eliminated. It is a vent valve regulated by the section.

According to the sixteenth aspect of the present invention, the valve body spherical surface, which is a part of the spherical surface of the rotary valve body, is a vent valve that is in tangential contact with the conical taper surface mounted in the cylinder body.

The invention according to claim 17 is a vent valve in which the rotary valve body is a disc-shaped valve body.

The invention according to claim 18 is a vent valve in which the rotary valve body for the vent valve has a rotation moment that rotates in the valve opening direction and a rotation moment that rotates in the valve closing direction, and opens and closes the flow path by the rotary valve body. Thus, by setting the peak of the valve closing force of the rotary valve body between the valve opening fully closed and the valve opening fully open, the vent valve suppresses the chattering phenomenon between the rotary valve body and the valve seat.

The invention according to claim 19 is a vent valve in which the valve closing force peak of the rotary valve element is set between 5% and 50%.

The invention according to claim 20 is a vent valve having a double eccentric structure in which the rotation center of the rotary valve body is double eccentric.

The invention according to claim 21 is a vent valve in which the eccentricity of the valve body support portion that supports the rotary valve body with respect to the rotary valve body is approximately 40% or more.

According to a twenty-second aspect of the present invention, the rotary valve body is a vent valve that is disposed at a position where the valve body is opened by its own weight, and is in a valve-closed state by balance with a weight portion provided on the disk body.

The invention according to claim 23 is the drain pipe system in which the vent valve is mounted on the extended vent pipe or the lower part of the overflow edge.

According to the first aspect of the present invention, the valve can be opened and closed by a disc-like valve body rotatably incorporated in the cylinder body, and can be provided with a simple configuration. When installed, the vent pipe can be prevented from being enlarged in the radial direction, and can be installed while saving space in a narrow pipe space substantially the same as the vent pipe. When the pressure in the cylinder body is atmospheric or when positive pressure is generated in the cylinder body, the disc-shaped valve body is configured to generate unbalance torque that rotates in the valve closing direction via the rotating shaft. The valve closed state is maintained while exhibiting high sealing performance. On the other hand, when a negative pressure is generated in the cylinder body, an unbalance torque that rotates in the valve opening direction via the rotating shaft is generated in the disc-shaped valve body, and the airflow resistance is suppressed by the shape of the disc-shaped valve body. While ensuring a large air flow rate and operating with high responsiveness, the valve is in an open state, thereby suppressing the chattering phenomenon and sucking in sufficient air from the outside to reliably eliminate negative pressure.

According to the second aspect of the present invention, the sliding range between the sealing surface on the valve body side and the sealing surface on the valve seat side during opening and closing of the valve is extremely suppressed, and the valve body sealing surface is separated from the valve seat sealing surface side. Since there is no part that contacts the valve body seal surface, the valve body seal surface can be smoothly opened and closed by smooth opening and closing operation with low torque while suppressing contact resistance between the valve body seal surface and the valve seat seal surface side when opening and closing the valve body. In order to eliminate negative pressure reliably, and at the time of atmospheric pressure or when positive pressure is generated, it operates smoothly and quickly to the valve closed state to exhibit sealing performance, preventing drainage noise and odor leakage to the outside. It becomes possible.

According to the third aspect of the invention, the opening / closing operation and sealing function of the vent valve can be adjusted by appropriately setting the amount of eccentricity by changing the eccentric distance between the center axis direction and the radial direction of the eccentric shaft that has been eccentrically doubled. . In this case, by adjusting the amount of eccentricity from the center of the aperture, contact of the valve body seal surface to the valve seat side is always prevented, sliding resistance from valve opening to valve closing operation is reduced, and the disc-shaped valve body is opened. The phenomenon that the opening operation becomes unstable due to the action of the moment in the closing direction due to the unbalanced torque generated by the difference in the air pressure in the pipe during the operation in the direction is prevented. By adjusting the amount of eccentricity from the sealing surface, sliding between the disc-shaped valve body and the valve seat side until just before the valve is closed is prevented, and the valve can be reliably operated until the valve is closed. As a result, the responsiveness of the disc-like valve element is improved in accordance with the diameter of the vent pipe and the magnitude of the negative pressure generated inside the vent pipe, thereby eliminating the ventilation trouble due to the negative pressure.

According to the invention of claim 4, the weight of the valve body on the small pressure receiving surface side with respect to the eccentric shaft is made larger than that on the large pressure receiving surface side to maintain the valve closed state of the disc-shaped valve body. Maintains the valve closed state at atmospheric pressure or positive pressure, and stabilizes the characteristics of the torque in the closing direction due to the weight of the valve against the valve opening torque to prevent chattering even when extremely small pressure fluctuations occur When the negative pressure is generated, the negative pressure is eliminated by a stable valve opening operation, and after the negative pressure is eliminated, the valve is reliably operated until the valve is closed.

According to the fifth aspect of the invention, the weight of the valve body on the small pressure receiving surface side is made heavier than the large pressure receiving surface side by the weight portion, so that the disc-shaped valve body is operated in the closing direction at the time of atmospheric pressure or positive pressure. It exhibits sealing performance when the valve is closed. In addition, by adjusting the weight of the weight and optimally setting the center of gravity movement that accompanies the rotation of the disc-shaped valve body, the unbalance torque and negative pressure generated at the atmospheric pressure or positive pressure generated in the disc-shaped valve body can be reduced. The disc-like valve element can be reliably operated in a state in which the unbalance torque at the time of pressure is improved in response to the fluctuation of the pressure in the cylinder body.

According to the invention of claim 6, the weight portion can be replaced, and the ventilation function can be adjusted by appropriately setting the weight amount and its position as the mass of the weight portion. Unbalance torque is reliably generated at the time of pressure generation, and the negative pressure can be eliminated by operating the disc-shaped valve body, and the weight part provides responsiveness to negative pressure either before or after installation. Fine adjustment can eliminate negative pressure.

According to the seventh aspect of the present invention, the valve seat surface of the cylinder body has a reduced diameter taper surface, and the valve seat contact surface of the disc-shaped valve body has a center substantially on the same axis as the center of the valve seat surface. Since the seal part is provided so that it can be contacted by contact with the line, the circle from the valve closed state to the valve open state is prevented by preventing interference between the valve seat surface and the valve seat contact surface until just before the valve is closed. The plate-like valve element can be operated smoothly. When the valve is closed, the valve closed state can be maintained while improving the sealing performance by line contact between the valve seat surface and the valve seat contact surface. Even if the valve seat and disc-shaped disc are slightly displaced due to assembly errors due to contact due to this line contact, the disc-shaped disc is aligned with the valve seat, and the valve seat surface and valve seat An annular sealing state with the contact surface can be secured.

According to the invention which concerns on Claim 8, the cylinder body is provided with a transparent or semi-transparent drain pipe outlet for the external drain pipe, and the adhesive state with the external drain pipe is made visible through the drain pipe outlet. It is possible to connect to the external drain pipe in an accurate mounting state while visually confirming the insertion state of the external drain pipe and preventing the disc-shaped valve body and the rotation shaft from tilting.

According to the ninth aspect of the present invention, since the disc-like valve body is provided via the arm member from the rotating shaft provided in the vicinity of the inner periphery of the cylinder main body, the rotation to the ventilation channel in the valve main body is achieved. The exposure of the shaft can be suppressed as much as possible, and the responsiveness is improved by suppressing the ventilation resistance to the rotating shaft, and at the time of atmospheric pressure or when positive pressure is generated, unbalance torque in the valve closing direction is generated and high sealing performance is demonstrated. Then, the valve closed state is maintained. On the other hand, when a negative pressure is generated, an unbalance torque in the valve opening direction is generated and the valve is opened to cancel the negative pressure.

According to the invention according to claim 10, by providing a stopper seal ring in the valve body, the disc-like valve body when the valve is closed can be brought into contact with the stopper seal ring to stop the operation, This prevents valve disc overrun and at the same time closes the valve.

According to the invention of claim 11, the rotary valve body has a rotational moment in the valve opening direction and the valve closing direction, and the chattering phenomenon at the time of fine opening of the valve is suppressed by exhibiting the ventilation valve function by this rotational moment. However, when negative pressure is generated, the valve opens with high responsiveness to cancel the negative pressure.On the other hand, when atmospheric pressure or positive pressure occurs, the valve closed state is reliably maintained while exhibiting high sealing performance. Prevents noise during drainage and leakage of odors to the outside.

According to the twelfth aspect of the present invention, since the rotary valve body has a structure that gives a rotational moment via a fulcrum in the cylinder body, the whole can be made compact in the pipe diameter direction and installed in substantially the same piping space as the vent pipe. When the valve is opened, the rotary valve body can be rotated about the fulcrum to a direction substantially parallel to the flow path, so that the ventilation resistance can be reduced, and the negative pressure can be eliminated by linearly guiding the atmospheric pressure to the ventilation pipe. By providing the rotary valve body approximately the same diameter as the inner diameter of the flow path, a large vent diameter can be secured.In this case, the rotation moment in the opening direction on the large diameter side of the rotary valve body increases, The valve body is easily opened by a large rotational moment, and the reactivity can be increased while reliably preventing chattering.

According to the thirteenth aspect of the present invention, the rotary valve body can be reliably operated to the valve closed state when atmospheric pressure or positive pressure is generated by the weight portion. By adjusting the weight of the weight part, the center of gravity movement during rotation of the rotary valve body can be set to an optimal state, so that the rotational moment in the valve closing direction that occurs during atmospheric pressure or positive pressure and the valve that occurs during negative pressure The rotary valve element can be operated while improving the response of the rotational moment in the opening direction in accordance with the pressure fluctuation.

According to the invention of claim 14, while making the whole compact, the sliding range between the sealing surface on the valve body side and the sealing surface on the valve seat side is suppressed very slightly by the double eccentric structure, and the wear is suppressed to prevent the valve. Maintains high sealing performance when closed. Since the valve body opens and closes smoothly with low torque, the negative pressure is smoothly eliminated when the valve is opened, and the valve is quickly closed when atmospheric pressure or positive pressure is generated, thereby reliably preventing odor leakage.

According to the fifteenth aspect of the present invention, when a negative pressure is generated, the rotary valve body can be regulated by the valve opening regulating portion and kept in a stable position while ensuring a large vent diameter. When the negative pressure is eliminated, the rotary valve body reliably returns to the valve closed state, and the rotary valve body is prevented from being held open at all times, such as at atmospheric pressure or positive pressure.

According to the sixteenth aspect of the present invention, the rotary valve body operates smoothly from the valve closed state to the valve open state by preventing contact between the valve body spherical surface and the conical tapered surface until immediately before the valve is closed. When the valve is closed, the valve body spherical surface comes into tangential contact with the conical taper surface to increase the sealing surface pressure, thereby improving the sealing performance. Due to these tangential contacts, even if the position of the spherical surface of the valve body and the conical taper surface is slightly deviated due to assembly errors or the like, the rotary valve body is aligned with the valve seat, and the spherical surface of the valve body and the conical taper surface An annular seal state can be secured.

According to the invention of claim 17, by forming the rotary valve body thinly, the ventilation resistance when the valve is opened is reduced to ensure a large flow rate, and by reducing the weight of the rotary valve body, a slight negative pressure is prevented. However, the negative pressure can be surely eliminated by improving the responsiveness during the opening / closing operation.

According to the eighteenth aspect of the present invention, when a negative pressure is generated inside, the flow path is opened and closed by the rotary valve body to eliminate the negative pressure. At that time, by setting the peak of the valve closing force of the rotary valve body between the valve opening fully closed and fully opened, the valve body tries to maintain this intermediate opening state, and the negative pressure changes. Even if it occurs, it can operate in a stable state. As a result, it is possible to provide a novel vent valve that can reliably eliminate negative pressure while suppressing chattering due to repeated minute opening and closing operations of the rotating valve body during valve body operation including when the valve is slightly opened.

According to the nineteenth aspect of the invention, by setting the peak of the valve closing force of the rotary valve body between 5% and 50%, the rotary valve body can be reliably returned to the valve closed state. The valve closing force of the rotary valve body can be set to the maximum at the intermediate opening. If the rotary valve body is in a fine opening range near the fully closed position, even when the negative pressure fluctuates, the rotary valve body is maintained in a balanced state to prevent seating and to prevent chattering.

According to the invention of claim 20, the sliding range between the valve body seal side and the valve seat seal side during the opening / closing operation of the rotary valve body is suppressed to a slight extent to reduce these contact resistances, while preventing wear. It is possible to smoothly open and close the rotating valve body with torque, and exhibit high sealing performance when the valve is closed.

According to the invention of claim 21, the weight on the valve closing side of the disc body and the weight on the valve opening side with respect to the valve body support portion can be functionally separated, and the eccentricity of the valve body support portion with respect to the rotary valve body is During normal operation, the valve closed state is reliably maintained, and even when pressure fluctuations occur, the characteristics of the closing direction torque due to the weight of the valve body with respect to the valve opening torque are increased to prevent chattering and to stabilize the valve closing. The state can be maintained. When negative pressure is generated, the rotary valve body prevents the valve closing operation due to the unbalance torque through the valve body support part and smoothly opens the valve to eliminate the negative pressure. After the negative pressure is eliminated, the rotary valve body Operates slowly and returns to the valve closed state.

According to the invention of claim 22, in the normal state, a force in the valve closing direction is applied to the rotary valve body due to the balance with the weight portion, and the valve closed state is maintained in a stable state. When negative pressure is generated, a force in the valve opening direction is applied to the rotary valve body, so that the rotary valve body opens smoothly against the weight of the weight, and opens and closes while exhibiting high responsiveness in response to pressure fluctuations. Operate.

According to the invention of claim 23, the negative pressure inside the drainage horizontal pipe and drainage pipe connected to the drainage device is released to the atmosphere by being attached to the extended vent pipe of the drainage equipment piped to the individual house or the apartment house. It can be installed, or it can be attached to the lower part of the drainage of the drainage device to eliminate the negative pressure generated in the individual drainage device. Thus, it is possible to smoothly drain water while suppressing drainage sound while preventing odor leakage.

It is a center longitudinal cross-sectional view which shows 1st Embodiment of the ventilation valve of this invention. It is a center longitudinal cross-sectional view which shows the valve closed state of the ventilation valve of FIG. FIG. 2 is an exploded perspective view of the vent valve of FIG. 1. It is sectional drawing which shows the relationship between a disk shaped valve body and a valve seat. It is a schematic diagram of a disc-shaped valve body. It is a schematic diagram which shows an example of a drain pipe system. It is a center longitudinal cross-sectional view which shows 2nd Embodiment of the ventilation valve of this invention. It is a center longitudinal cross-sectional view which shows the valve open state of the ventilation valve of FIG. It is a top view which shows the state which removed the cover of FIG. FIG. 8 is an exploded perspective view of the vent valve of FIG. 7. It is a schematic diagram of the vent valve of FIG. It is a schematic sectional drawing of the ventilation valve of FIG. It is a schematic diagram showing the ventilation apparatus of a comparative example. It is a graph which shows the relationship between a valve opening degree and valve closing force. (A) is another graph which shows the relationship between valve opening degree and valve closing force. (B) is a graph which shows the fluctuation | variation of the magnitude | size of the negative pressure from negative pressure generation to the time of negative pressure cancellation. It is a center sectional view showing a 3rd embodiment of a vent valve of the present invention. It is a center longitudinal cross-sectional view which shows the valve open state of the ventilation valve of FIG. It is a center longitudinal cross-sectional view which shows 4th Embodiment of a vent valve. It is a center longitudinal cross-sectional view which shows the valve open state of the ventilation valve of FIG.

Hereinafter, a vent valve and a drain pipe system according to the present invention will be described in detail based on embodiments. 1 to 3 show a first embodiment of a vent valve according to the present invention. The ventilation valve (hereinafter referred to as the valve body 1) is provided in the drain pipe system (hereinafter referred to as the system body 2) shown in FIG.

In FIG. 6, the system main body 2 is provided between the outer wall 5 and the inner wall 6 in, for example, an individual house or an apartment house, and the valve main body 1 extends from the drain pipe 3 to a position lower than the ceiling 7. The negative pressure generated in the drain pipe 3 through the system main body 2 can be eliminated by being attached to the lower portion of the overflow edge of the vent pipe 4 or the drainage device. In the present embodiment, an example in which the valve main body 1 is provided in the extended vent pipe 4 of the system main body 2 will be described.

The extended top vent pipe 4 is provided so as to extend above the drainage stack 3 a of the drain pipe 3, and the valve body 1 is connected to the distal end side of the extended top vent pipe 4. A drainage horizontal branch pipe 3b is branched and provided at a position lower than the extending top ventilation pipe 4 of the drainage stack 3a, and a drainage device 8 is provided on the primary side of the drainage horizontal branch pipe 3b. An inspection port 6 a is provided at an appropriate position of the inner wall 6, and the inspection port 6 a is provided with a shielding member 9 that is detachable as shown by cross-hatching and can take outside air into the space between the outer wall 5 and the inner wall 6. Installed. By removing the shielding member 9 from the inspection port 6a, the valve body 1 can be inspected and replaced from the inspection port 6a. Since the valve body 1 has substantially the same diameter as the extended vent pipe 4, it can be installed by additionally processing the existing drain pipe 3 or vent pipe 4 and can be installed between the outer wall 5 and the inner wall 6 of the existing house. it can.

The valve body 1 has a valve unit 10, a body 11, and a cap 12, and is provided corresponding to a caliber of size 40A, for example, and operates with a fluid made of air.

Among the valve main bodies 1, the valve unit 10 includes a cylinder main body 20, a seat 21, a seat holder 22, a disc-like valve body 23, and a rotating shaft (hinge) 24, which are provided in a unit structure in which these are integrated. The vent valve function that eliminates the negative pressure in the drain pipe 3 is exhibited.

The cylinder main body 20 in the valve unit 10 is made of a resin material such as ABS resin, and is formed of a substantially cylindrical cartridge body in which the ventilation channel 30 that can be inserted into the mounting position of the body 11 is straight. . In FIG. 3, two mounting

holes

31, 31 for mounting the rotating shaft 24 are formed through the outer tube portion of the tube body 20. The mounting hole 31 is a position shifted from the center P1 of the diameter of the cylinder body 20 (an eccentric position), and is also shifted from a later-described valve body seal surface 41 (the seal center surface thereof) of the disc-like valve body 23. It is set based on the center P3 of the valve body support portion 32 at the position (the eccentric position).
On the other hand, convex portions 33 for engaging and fixing the sheet holder 22 are intermittently formed on the outer peripheral upper portion of the tube body 20 in the circumferential direction.

A seat 21 that is an annular valve seat can be placed on the upper surface of the cylinder body 20, and the seat 21 is mounted on the inner periphery of the seat holder 22. The seat 21 is formed of, for example, a rubber material such as EPDM, and the valve seat surface 35 that is a valve seat sealing surface of the seat 21 is a conical shape having a reduced diameter, that is, a tapered surface, or a rounded surface. It is formed by the tapered surface shown in FIG. The apex of a cone (not shown) formed by the valve seat surface 35 is provided so as to be positioned in the shape of the axial center of the diameter of the cylinder main body 20 of FIG.

An annular recess (not shown) may be provided at any one of the upper and lower surfaces or the upper and lower surfaces of the sheet 21. When the annular recess is provided in this way, the flexibility of the seat 21 on the valve seat surface 35 side is improved, and when the disc-like valve body 23 is closed, the valve seat surface 35 side is placed on the valve seat contact of the disc main body 40. It is possible to improve the sealing performance by deforming along the contact surface 41 and bringing the valve seat surface 35 and the valve seat contact surface 41 into contact with each other over the circumference. The annular recess can be provided in any shape.

1 to 3, the sheet holder 22 is formed of a resin material such as ABS resin, and an inner peripheral flange 36 for holding the sheet 21 is formed on the upper portion thereof so as to protrude in the inner peripheral direction. In the lower part, an outer peripheral flange 38 for pressing a gasket 37 disposed between the body 11 and the body 11 to be described later is formed to project in the outer peripheral direction. In the middle position of the sheet holder 22, a concave portion 39 that can engage with the convex portion 33 of the cylinder body 20 is formed intermittently at a position corresponding to the convex portion 33.

The sheet holder 22 has a cylindrical body 20 and a cap 12 described later in a state where the inner peripheral flange 36 is placed on the upper surface of the gasket 37 placed on the seat 11 and the outer peripheral flange 38 is placed on the body 11. By being mounted between and engaged with and fixed to the cylinder main body 20, the position of the seat 21 in the center direction of the aperture is determined. When the outer periphery of the sheet 21 comes into contact with the inner periphery of the sheet holder 22, the radial position of the sheet 21 is determined. In this state, the sheet 21 is sandwiched and fixed between the cylinder body 20 and the sheet holder 22. The

The disc-shaped valve body 23 is attached to the inside of the cylinder body 20 via the rotating shaft 24, and the valve unit 10 is provided by the disc-shaped valve body 23 so that the valve can be opened and closed. The disc-like valve body 23 has a disc-like disc main body 40 and a columnar valve body support portion 32, and is rotatably attached to the cylinder main body 20 via the rotation shaft 24.

The disc main body 40 shown in FIG. 4A is provided with a resin material such as ABS resin, and has a valve seat contact surface 41 that is a valve body seal surface that contacts the seat 21. The surface 41 is formed of a spherical surface having a radius R as shown in FIG. 4B (a surface having a substantially rounded cross section that forms a part of the spherical surface). By providing in this shape, the above-described valve seat surface 35 and the disc-like valve body 23 are set so as to obtain a sealed state in which contact with the line is possible when the valve is closed. The valve seat abutting surface (spherical surface) 41 is provided so that the center thereof is located on the center axis of the diameter of the cylinder body 20.
Here, the line contact (also referred to as tangential contact) state in this example is a seal state in which the width of the annular seal between the seat 21 and the disc-like valve body 23 when the valve is closed is narrower than that per surface. . In this case, the line contact includes not only the line contact but also the case of surface contact in a very narrow region.

Although not shown, the valve seat abutment surface 41 has a plateau surface at its sealing portion to prevent sticking to the seat 21 when the valve is closed. Furthermore, oil is stored in the dimple portion on the plateau surface, or on either side of the disc-shaped valve body 23 or the seat 21 for preventing sticking to the seat 21 when the valve is closed. A satin finish may be given.
The valve seat contact surface 41 is not limited to a plateau surface, and may be processed so as to moderately roughen the surface. Also in this case, when an oil component such as oil is applied to the valve seat contact surface 41, sealing performance is secured while preventing the valve seat contact surface 41 and the seat 21 from sticking to each other.

In order to increase the flexibility on the valve seat abutment surface 41 side, for example, the valve seat abutment surface 41 side is formed of a material different from that of the disc body, or the valve seat abutment surface 41 side is laminated. You may make it perform various processes, such as. In this case, when the disc-like valve body 23 is closed, the valve seat contact surface 41 side is deformed so as to follow the valve seat surface 35 of the seat 21, and the valve seat surface 35 and the valve seat contact surface 41 are changed. It is possible to improve the sealing performance by contacting over the circumference.
In order to increase the flexibility on the valve seat contact surface 41 side, the seat 21 may be omitted, and the valve seat surface 35 may be provided directly on the seat holder 22.

The valve body support portion 32 is integrally formed with the disc body 40, and is provided vertically at a position eccentric from the valve seat contact surface (valve body seal surface) 41 of the disc body 40 by an eccentric distance D1. The distal end of the valve body support portion 32 is formed in a cracked shape, and is provided so as to be attachable to a rotating shaft 24 described later by snap fitting. Thus, as shown in the schematic diagram of FIG. 5, the pressure receiving area of the disc-like valve body 23 is such that the valve body support portion 32 is eccentric from the center P1 of the diameter of the cylinder body 20 (valve diameter). A large pressure receiving surface 42 and a small pressure receiving surface 43 are formed with the central axis of the rotating shaft 24 as a boundary. The area ratio between the area A of the large pressure receiving surface 42 and the area B of the small pressure receiving surface 43 is appropriately set according to the setting of the ventilation performance as a ventilation valve.

1 to 3, the rotary shaft 24 is formed integrally with the disk main body 40 or formed as a valve body, and is attached to the cylinder main body 20 so that the disk main body 40 is rotatable. In this example, the rotating shaft 24 is formed of a metal material such as a stainless material in a substantially cylindrical shape separate from the disc main body 40, and the outer peripheral surface thereof is inserted into the mounting

holes

31, 31 of the tube main body 20. A disc body 40 is attached to the shaft 24. Thereby, the disk main body 40 can be rotated via the rotation shaft 24.

In addition to this, although not shown, for example, the rotating shaft 24 is formed in a hollow cylindrical shape integrally with the disc main body 40 in a hollow cylindrical shape. On the other hand, in the mounting holes 31, 31 of the cylindrical main body 20, a metal material such as a stainless material is used. The disk main body 40 may be rotatably mounted on the cylinder main body 20 through the support shaft so that the support shaft is inserted into the hollow cylindrical portion of the disk main body 40. it can. In this case, by using the support shaft, the contact surface between the support shaft and the hollow cylindrical portion becomes small, and the sliding resistance when the disk main body 40 is rotated can be kept low.

The center of the rotating shaft 24 is a position eccentric from the center P1 of the diameter of the cylinder body 20 by being mounted through the mounting hole 31 as described above, and the valve body seal of the disc-shaped valve body 23 It becomes the center P3 of the valve body support part 32 in the position eccentric from the surface 41 (the seal center plane). Thus, the rotating shaft 24 is rotatably provided as the eccentric shaft of the double eccentric structure by the double eccentric center P3.

A disc-like valve body 23 is rotatably incorporated in the cylinder body 20 via the rotating shaft 24. As a result, the disc-like valve body 23 generates the first unbalance torque that rotates in the valve opening direction via the rotation shaft 24 when the negative pressure in the cylinder body 20 is negative, so that the atmosphere can be sucked from the outside. Yes.

On the other hand, when the cylinder main body 20 is at atmospheric pressure or positive pressure, a second unbalance torque that rotates in the valve closing direction is generated via the rotating shaft 24 so that the valve is closed. Here, the atmospheric pressure means that no negative pressure equal to or higher than a preset value (for example, 30 Pa) is generated in the cylinder main body 20, and the difference between the primary side and the secondary side of the disc-like valve body 23. A pressure difference state in which there is almost no pressure or almost no need to ventilate. The positive pressure and the negative pressure indicate a state in which a positive pressure is applied to the cylinder body 20, and a negative value greater than a preset value. A state where pressure is applied. Accordingly, the atmospheric pressure is a state including a minute negative pressure, for example, a negative pressure lower than a preset value (30 Pa).

The unbalance torque (or unbalanced rotational moment) in this embodiment is the rotational force in the opening direction based on the differential pressure generated inside and outside the valve body, and the rotation in the closing direction based on the cancellation of the differential pressure inside and outside the valve body. I say power.

The eccentric distance D1 from the center P1 of the diameter of the cylinder body 20 of the eccentric shaft (rotating shaft) 24 shown in FIG. 2 to the center P3 of the valve body support portion 32, and the valve seat contact surface 41 of the disc-shaped valve body 23 By changing the eccentric distance D2 from the center of the seal (the center of the valve body seal surface) P2 to the center P3 of the valve body support portion, the sealing position (valve seat) of the disc-like valve body 23 is changed. It is possible to arbitrarily set the amount of eccentricity that is doubly decentered from the contact surface 41 and the valve seat surface 35). By setting these double amounts of eccentricity in advance, the opening / closing operation / sealing function It is possible to provide a vent valve with adjusted.

The rotary shaft 24 is provided with a weight portion 50, and the weight portion 50 makes the weight of the valve body on the small pressure receiving surface 43 side of the disc main body 40 larger than the weight of the valve body on the large pressure receiving surface 42 side. ing. As a result, the disc-like valve body 23 rotates about the rotation shaft 24 in a direction to close the valve in the range of the valve open position from the fully closed position to about 90 degrees, and the disc-like valve body 23 is closed. State is to be maintained. In this way, the weight of the valve body on the small pressure receiving surface 43 side is made heavier than the large pressure receiving surface 42 side with respect to the rotating shaft 24, thereby assisting the unbalance torque rotating in the valve closing direction, The movement can be promoted.

As shown in FIG. 3, in this embodiment, the weight part 50 is comprised by three components, the weight main body 51 and the

hinge insertion weights

52 and 52. As shown in FIG. The weight body 51 is mounted in a direction perpendicular to the fixing direction of the valve body support portion 32, and the hinge insertion weights 52 are respectively inserted from the left and right sides of the rotary shaft 24 into the inside thereof. At this time, the weight main body 51 and the hinge insertion weight 52 are fixed by the rivet 53 via the rotating shaft 24 and are respectively integrated with the rotating shaft 24.

The weight portion 50 can appropriately set the weight amount of the weight body 51 and the hinge insertion weight 52 and the mounting position thereof. With these settings, the valve opening direction with respect to the magnitude of the negative pressure, the valve The unbalance torque in the closing direction can be adjusted to adjust the ventilation function.

In this example, the weight main body 51 is formed in a substantially rectangular parallelepiped shape, but may be provided in a cylindrical shape or other shapes. Thereby, it becomes possible to reduce the ventilation resistance at the time of valve opening rather than the case of a substantially rectangular parallelepiped.
Although the weight part 50 is provided by the weight main body 51 and the hinge insertion weight 52, the weight part may be provided by parts other than these, and further, the valve on the small pressure receiving surface 43 side with respect to the eccentric shaft. If the body weight is made heavier than the large pressure receiving surface 42 side, for example, the thickness of the disc-like valve body 23 on the small pressure receiving surface 43 side is increased, the weight portion can be omitted. In this case, the disk main body 40 may be shaped so that the small pressure receiving surface 43 is heavier than the large pressure receiving surface 42 side.

Here, the eccentric valve structure of the valve unit 10 of this example will be described in more detail.
In FIG. 2, when the disc-shaped valve body 23 has an eccentric structure, the disc body 40 has a rotational moment (rotational torque) α associated with the difference in weight between the small pressure receiving surface 43 and the large pressure receiving surface 42 in the direction of the arrow, that is, Try to work in the valve opening direction.

On the other hand, by disposing the weight portion 50 on the disc-like valve body 23 as described above, the disc body 40 has a rotational moment (rotational torque) β due to the weight of the weight portion 50 in the direction of the arrow, that is, Try to work in the valve closing direction.

Since the disc-like valve element 23 to which the rotational moments α and β are applied is required to maintain the valve closed state at the atmospheric pressure or at the positive pressure, that is, when no negative pressure is applied, the rotation in the valve closing direction is required. The moment β must exceed the rotational moment α in the valve opening direction, and the relationship of rotational moment β> rotational moment α must be satisfied. The eccentric amount of the eccentric distances D1 and D2, the weight of the weight portion 50, and the like are set so as to satisfy this relationship.

At this time, the seal between the disc-shaped valve element 23 and the seat 21 is set by setting the rotational moment β slightly larger in consideration of the frictional resistance of the rotating shaft 24 and the dimensional tolerance of each component constituting the valve unit 10. It is desirable to reliably maintain sex.
Further, even if a slight negative pressure that causes an error occurs in the extended vent pipe 4, the valve does not immediately open. For example, when a negative pressure of 30 Pa or more occurs, the valve opens for the first time. The moment β should be set.

Further, the eccentricity of the valve body support portion 32 with respect to the disk-shaped valve body 23 described above (the eccentric distance (the amount of eccentricity) D1 / disk from the center P1 of the diameter of the cylinder body 20 to the center P3 of the valve body support portion 32). The radius r) of the valve body 23 is set to an area ratio of about 40%. This is to prevent a rotation moment γ in the valve closing direction due to a third unbalance torque described later from being applied during rotation in the valve opening direction due to negative pressure.

The reason for this will be described below. For example, in a general butterfly valve body in which water, which is an incompressible fluid, flows in the flow path, even if the eccentricity is set to about 30%, the operation in the valve opening direction due to the negative pressure generated on the orifice side It is known that a moment in the closing direction due to an unbalanced torque generated by the fluid pressure difference between the orifice side and the nozzle side of the valve body, that is, a rotational moment in the valve closing direction due to the flow of fluid acts. ing.

On the other hand, the fluid flowing through the valve body 1 of the present embodiment is a gas that is a compressible fluid, and the pressure is 30 to the extent that the negative pressure in the drain pipe 3 is eliminated and the trap seal water of the drainage device is protected. ~ 50 Pa. As described above, the gas flowing in the valve body 1 is compressible, and the negative pressure generated on the large pressure-receiving surface side due to the pressure lower than that of water increases the influence on the disc-shaped valve body 23. Can be considered.

Moreover, since the pressure is a slight pressure generated by the difference between the low atmospheric pressure and the negative pressure, the valve closing moment due to the small pressure applied to the large pressure receiving surface side and the small pressure receiving surface side varies with the valve body support portion 141 as a boundary. This easily increases the influence of the rotary valve body 121 on the valve closing operation.

From these facts, allowance is given in comparison with the case where the fluid is water, the assembly error of the rotary valve element 121 with respect to the valve main body 100 and the influence of the shape of the valve element support part 141 are taken into consideration, and the allowance is observed. The eccentricity is 40%, the third unbalance torque caused by the flow of fluid is reduced, and the first and second unbalance torques described later can reliably operate the rotary valve body 121 in the opening / closing direction. I made it.

In FIG. 5, as described above, when the eccentricity is set to 40%, the pressure receiving area ratio between the pressure receiving area A of the large pressure receiving surface 42 and the pressure receiving area B of the small pressure receiving surface 43 is: pressure receiving area A: pressure receiving area B = About 3: 1.

On the other hand, in FIGS. 1 to 3, the body 11 is formed in a substantially cylindrical shape by a resin material such as ABS resin, more specifically, a transparent resin or a translucent resin, so that the valve unit 10 can be inserted from above. Provided.

An enlarged diameter annular step portion 60 is formed on the upper portion of the body 11, and the outer peripheral flange portion 38 of the sheet holder 22 is engaged with the annular step portion 60 via the gasket 37. Is installed. A bayonet-type connection recess 61 for fixing the cap 12 is formed above the annular step 60.

An annular edge 62 is formed on the inner periphery of a substantially intermediate position in the height direction of the body 11. When the valve unit 10 is inserted from above the body 11, the lower end of the valve unit 10 comes into contact with the annular edge portion 62, so that the body 11 is mounted while being positioned in the height direction.

In the lower part of the body 11, a drain pipe insertion port 63 for connecting the extended vent pipe 4 and the external drain pipe is provided. The drain pipe insertion port 63 is connected to the valve unit 10 on the upper part of the body 11 by an annular edge 62. Separated from the insertion side. The extended vent pipe 4 and the external drain pipe are inserted from the lower part of the body 11, and at this time, the ends of these pipes abut against the annular edge 62, so that the body 11 is positioned and fixed with respect to the pipe. Glued.

By attaching the cylinder body 20 to the body 11 in this way, the drain pipe insertion port 63 is provided integrally with the body 11. As described above, since the drainage pipe insertion port 63 is formed to be transparent or translucent, the adhesive state with the extended vent pipe 4 and the external drainage pipe is visible from the outside.

The cap 12 is formed of a resin material such as ABS resin, and a top plate portion 70 is formed at the upper portion and a connection portion 71 to the body 11 is formed at the lower portion. The connecting portion 71 is formed to have an outer diameter that can be inserted into the upper portion of the body 11, and an outer peripheral convex piece 72 that can be connected to the connecting concave portion 61 of the body 11 and the bayonet is formed on the outer periphery of the connecting portion 71. The cap 12 is mounted in a fitted state between the inner periphery of the body 11 and the seat holder 22. At this time, the outer peripheral convex piece 72 and the connecting concave portion 61 are bayonet-connected, so that the natural removal from the body 11 is performed. Is prevented.

Between the top plate portion 70 and the connection portion 71, a plurality of columnar portions 73 are formed at regular intervals so as to be bridged, and an air passage 74 is formed between the columnar portions 73. The columnar portion 73 can be appropriately reduced in the number of installations or the interval can be narrowed in order to ensure the air flow rate of the air passage 74, and at that time, the columnar portion 73 is provided in a streamline shape such as an arc shape forming a part of a cylindrical shape. It is desirable.

In the above embodiment, the disc-like valve body 23 is attached in such a direction that the rotary shaft 24 is on the drainage pipe 3 (extended-top aeration pipe 4) side, but is attached in such a direction that the rotary shaft 24 is on the atmosphere side. It may also be a structured. When the rotary shaft 24 is provided on the drain pipe 3 side, the aesthetics from the upper side can be improved. On the other hand, when the rotary shaft 24 is provided on the atmosphere side, contact of the rotary shaft 24 with the steam, foreign matter, etc. By avoiding it, durability can be improved.

Also, the valve body may be provided in a structure that can be disposed sideways. In this case, it is possible to use a so-called in-line type by connecting piping to the primary and secondary sides of the valve body.

Next, the operation of the above-described embodiment of the vent valve and drain pipe system of the present invention will be described.
1 to 3, when the valve body 1 is attached to the system body 2, it is connected to the drain pipe insertion port 63 below the body 11 while inserting the extended vent pipe 4 coated with an adhesive. To. At this time, by forming the body 11 to be transparent or translucent, the insertion state of the extended vent pipe 4 and the application state of the adhesive can be visually recognized from the outside through the drain pipe insertion port 63.

In the valve body 1, the disc-like valve body 23 can be opened / closed around the rotating shaft 24 by an unbalanced torque, and the rotating shaft 24 is an eccentric shaft of the double eccentric structure described above. It is possible to eliminate the negative pressure in the system main body 2 while suppressing the pipe diameter to be equal to or less than that of the top vent pipe 4. In addition, since the ventilation channel is straight, it is possible to minimize the ventilation resistance caused by the disc-shaped valve body 23 in the valve open state and to ensure a sufficient amount of ventilation.

In the vent valve of the present invention, the air passage 74 is arranged on the extension line of the air passage 30 of the cylinder body 20, specifically, within the projected area of the circular cross section of the air passage 30. It can be led into the drain pipe 3 through the air flow path 30, and it has a compact structure with no bulge to the outside, has good valve opening operation responsiveness at the time of valve opening, and can obtain a sufficient ventilation amount. .

Regarding the operation, when the valve is closed at atmospheric pressure or positive pressure, the weight of the valve body on the small pressure receiving surface 43 side of the disc-like valve body 23 is slightly larger than that of the large pressure receiving surface 42 at the weight portion 50 provided on the rotating shaft 24. It is getting heavy. From this, in FIG. 4A, the distance LA from the center P3 of the valve body support portion 32 to the open side (large pressure receiving surface side) valve body center of gravity position GA, and the force Fo (large pressure receiving surface side) in the valve opening direction. Large pressure-receiving surface side rotational moment (rotational moment in the valve opening direction) Mo, which is a product of the weight of the valve body and the sum of forces generated by applying negative pressure to the large pressure-receiving surface, A distance LB from the center P3 to the closing side (small pressure receiving surface side) valve body center of gravity position GB and a force Fc in the valve closing direction (the weight of the valve body on the small pressure receiving side, the weight of the weight, and the negative pressure are small) The relationship between the small pressure-receiving surface side rotational moment (rotational moment in the valve closing direction) Mc, which is the product of the sum of the forces generated by applying to the pressure-receiving surface, is the large pressure-receiving surface-side rotational moment Mo <small pressure-receiving surface-side rotational moment. It becomes Mc and the valve closed state is maintained.

At this time, as shown in FIG. 4B, the valve seat surface 35 is a tapered surface (the taper angle in this embodiment is about 50 °), and the valve seat abutment surface 41 is a spherical surface (substantially in cross section forming a part of the spherical surface). Since these are round-shaped surfaces), they are abutted and sealed with a small contact area per line. Therefore, the sealing surface pressure is increased and odor leakage from the extended vent tube 4 is surely prevented, and the disc-like valve body 23 is pressed against the valve seat surface 35 at the time of positive pressure to maintain the sealing performance. In FIG. 2, the dotted line arrow indicates the direction of positive pressure.

Furthermore, since the valve seat surface 35 and the valve seat contact surface 41 are inclined downward, condensation is unlikely to occur between these seal portions when the valve is closed. In this way, since condensation can be prevented without providing a special structure separately for preventing condensation, the function as a vent valve can be maintained while maintaining the overall compactness without requiring a heat insulating material.

When drainage is performed in the system main body 2 and a negative pressure is generated in the extended vent pipe 4, a differential pressure is generated between the outside air side and the negative pressure side of the disc-like valve body 23 by this negative pressure. In this case, as described above, the rotation shaft 24 is at a position that is eccentric from the center P1 of the diameter of the cylinder body 20, and is centered on the center P3 that is eccentric from the valve body sealing surface 41 of the disc-like valve body 23. The disc-shaped valve body 23 is an eccentric structure having a large pressure receiving surface 42 and a small pressure receiving surface 43 with the rotating shaft 24 as a boundary. The pressure receiving area when receiving negative pressure is different between the pressure receiving surface 42 side and the small pressure receiving surface 43 side. At this time, as described above, the large pressure receiving surface 42 and the small pressure receiving surface 43 have a pressure receiving area ratio of about 3: 1, and the relationship of the pressure receiving area A of the large pressure receiving surface 42> the pressure receiving area B of the small pressure receiving surface 43 is satisfied. It has become.

When a negative pressure is applied to these areas, a rotational moment Mo in the valve opening direction is generated on the large pressure receiving surface 42 side of the disc-shaped valve body 23 and a rotational moment Mc in the valve opening direction is generated on the small pressure receiving surface side. From the difference in the area ratio between the pressure receiving surface 42 and the small pressure receiving surface 43, the relationship between the force Fo × distance LA, which is the large pressure receiving surface side rotational moment Mo, and the force Fc × distance LB, which is the small pressure receiving surface side rotational moment Mc, is Large pressure-receiving surface side rotation moment Mo> small pressure-receiving surface side rotation moment Mc.

For this reason, the disc-like valve element 23 is automatically moved from the valve closed state of FIG. 2 in the valve opening direction (counterclockwise) to the valve open state of FIG. The atmospheric pressure is taken into the extended vent pipe 4 from the cylinder body 20 to eliminate the negative pressure. In FIG. 1, dotted arrows indicate the flow of the atmosphere.

In this case, the area ratio between the large pressure receiving surface 42 and the pressure receiving surface of the entire disc main body 40 is about 3: 4, and a negative pressure acts on the large pressure receiving surface 42 of about 3/4 against the disc main body 40. Will open the valve. Thereby, responsiveness becomes high compared with the case where a negative pressure acts on the disk main body 40 whole surface temporarily. In addition, since the ventilation channel 30 is straight, the ventilation of the disk-shaped valve element 23 can be smoothly performed without any ventilation.

When the negative pressure is eliminated and the inside of the extended vent pipe 4 returns to the atmospheric pressure, the weight of the valve body on the small pressure receiving surface 43 side of the disc-like valve body 23 is slightly heavier than that of the large pressure receiving surface 42. Therefore, the rotation moment in the valve closing direction acts, and the closing direction rotation moment is applied to the fully closed position and the valve is automatically returned to the valve closing position.

1 is an example when the weight is attached to the valve body. By adjusting the weight of the valve body and the weight and the amount of eccentricity so that the closed-side valve body gravity center position GB is positioned closer to the valve closing direction (right side in the figure) than the center P3 of the valve body support portion 32, It is possible to reliably perform the valve closing operation when the pressure is released. In addition, you may provide the stopper which controls the maximum opening degree of a valve so that the closed side valve body gravity center position GB may be arrange | positioned in the above-mentioned position.

As described above, the valve body 1 generates an unbalance torque by a balance structure using a rotation moment in the valve opening / valve closing direction without using a spring, and causes the valve opening / closing operation by the unbalance torque. It becomes possible. Thereby, smooth ventilation can be obtained without the chattering phenomenon occurring in the disc-like valve body 23.

Due to the double eccentric mounting structure, the disc-shaped valve element 23 does not always contact the valve seat surface 41 with the valve seat surface 35, but contacts them only when the valve is closed and immediately before the valve is closed. Therefore, the wear of the valve seat surface 35 and the disc-like valve body 23 is prevented, the durability is improved, and the deterioration of the sealing performance can be prevented.

In FIG. 6, the valve main body 1 is attached to the tip of the extended vent pipe 4 and the system main body 2 is provided. In this system main body 2, the drainage side branch pipe 3 b connected to the drainage device 8 and the drainage When a negative pressure is generated inside the riser 3a, the negative pressure can be eliminated by opening it from the valve body 1 to the atmosphere (outdoor).

In this case, as described above, since the valve body 1 can be made compact while ensuring the air flow rate, the valve body 1 can be installed in the piping space S where the depth dimension W between the outer wall 5 and the inner wall 6 is narrow. In addition, the valve body 1 can be connected to the drain pipe 3 in the piping space S and the negative pressure generated in the drain pipe 3 can be eliminated while securing a large space in a building such as a housing complex.
Furthermore, the size of the inspection body 6a can be reduced by downsizing the valve body 1, and the maintenance and inspection of the valve body 1 can be easily performed through the inspection opening 6a.

At this time, if the air permeability of the valve main body 1 is deteriorated due to aging or the like, the valve main body 1 is connected to the extended vent pipe 4 or the valve main body 1 is removed and the valve main body 1 is removed. The cap 12 is removed from the body 11 of the main body 1, and then the valve unit 10 inserted in the body 11 is integrally taken out as a cartridge. As a result, maintenance of the valve body 1 can be easily performed, and the valve mechanism portion and the interior of the extended vent pipe 4 can be cleaned, or the entire valve unit 10 or internal components can be individually cleaned or replaced. Can restore the vent valve function.

7 to 10 show a second embodiment of the vent valve of the present invention. In the following embodiments, the same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof is omitted.
The valve main body 100 of this embodiment includes a valve unit 110, a body 111, a cap 112, and a cover 113, and is provided so as to be shared with, for example, the size 40A, 50A extended vent pipe 4.

The valve unit 110 includes a cylinder main body 120, a seat 21, a rotary valve body 121 that is a disc-shaped valve body, an eccentric shaft (hinge) 122, and a weight portion 123, and these are integrally incorporated to rotate the rotary valve body 121. Provided possible.
As will be described later, the valve body 100 having the valve unit 110 has a rotary valve element (disk-shaped valve element) 121 for a vent valve that rotates in the valve opening direction and a rotation moment Mo that rotates in the valve opening direction. The rotary valve body 121 can exhibit a vent valve function.

In this case, in the valve main body 100, the rotary valve body 121 swings, and the rotary valve body 121 opens and closes the flow path by a pressure difference. The rotary valve body 121 is provided such that the peak of the valve closing force, that is, the peak of the force acting in the valve closing direction, is set between the valve opening fully closed (excluding the fully closed) and the fully opened. Thereby, the chattering phenomenon between the rotary valve body 121 and the valve seat is suppressed.

Further, preferably, the peak of the valve closing force of the rotary valve body 121 is set between 5% and 50%. Here, the valve opening degree θ of the rotary valve body 121 means that when the fully closed seal state with the seat 21 is 0% and the fully open state is 100%, the disc main body 140 to be described later corresponds to this fully closed seal state. This is the opening ratio.
In this embodiment, the valve body angle in the fully opened state is set to 80 °, which will be described later, and the peak of the valve closing force of the rotary valve body 121 is 20 °, that is, the valve opening is 25% (20 ° / 80 ° × 100 = 25%).

As shown in FIGS. 9 and 10, two mounting

holes

130 and 130 for mounting the eccentric shaft 122 are formed through the outer tube portion of the tube body 120. The mounting hole 130 is a position (eccentric position) that deviates from the center P1 of the diameter of the cylinder main body 120, and a position (eccentricity) that deviates from a later-described valve body spherical surface 143 (a seal center thereof) of the rotary valve body 121. Is set based on the center P3 of the valve body support portion 141 at the position.

A projection piece 131 projecting toward the inner diameter side with a predetermined size is formed around the inner periphery of the mounting hole 130, and a valve opening restricting portion 132 is provided on the projection piece 131. On the other hand, convex portions 133 for engaging and fixing the cap 112 are intermittently formed on the outer periphery of the cylinder main body 120 in the circumferential direction.

The valve opening restricting portion 132 is formed in a tapered surface shape, and the amount of rotation can be restricted by contacting the rotary valve body 121 when the valve is opened. As shown in FIG. 9, the valve opening restricting portion 132 is provided at a position on the outer side of the flow path, and is provided so that the vicinity of the outer peripheral edge portions on both sides of the fully opened rotary valve body 121 can be in contact with each other. It is done.

In FIG. 7, the angle θ from the valve seat horizontal plane of the valve opening restricting portion 132 is provided at a maximum size that can ensure the rotational moment Mc when the rotary valve body 121 rotates in the valve closing direction. The angle θ is set to approximately 80 °. The length X of the valve opening restricting portion 132 is set to a size that can prevent local deformation of the rotary valve body 121. Further, the length X in the inner diameter direction can be supported while allowing the vicinity of the outer peripheral edge of the rotary valve body 121 to be supported. By adopting a size that suppresses the protruding length, the ventilation resistance when the valve is opened is reduced, and a large ventilation amount is secured.

With such a configuration, the valve opening restricting portion 132 can restrict the rotary valve body 121 when the valve is opened by the maximum angle θ (approximately 80 °). Furthermore, the valve opening restricting portion 132 is provided at a position where the rotary valve body 121 can be returned to the valve closed state by balancing with the weight portion 123 when the negative pressure is eliminated. In the present embodiment, the angle θ is set to approximately 80 °, but this is set based on the balance between the rotational moment Mo and the rotational moment Mc and the rotational frictional force of the valve body support portion 141. It is also possible to make it approximately 90 ° by changing the weight.

The sheet 21 is provided with a size substantially the same as the outer diameter of the cylinder main body 120 and can be placed on the upper surface of the cylinder main body 120, and can be sandwiched between the cylinder main body 120 and the cap 112. Is provided. A conical taper surface 134 that is a seal surface with the rotary valve body 121 is formed on the seat 21 at a predetermined taper angle.

The rotary valve body (disk-shaped valve body) 121 has a disk main body 140 provided in a thin disk shape, and a valve body support portion 141 and a shaft mounting portion 142 are integrally formed on the disk main body 140. The
As shown in FIG. 8, the disc body 140 is formed with a valve body spherical surface 143 that forms a part of a spherical surface, and this valve body spherical surface 143 is provided so as to be able to abut against the conical tapered surface 134 of the seat 21. It is done. When the valve in FIG. 7 is closed, the valve body spherical surface 143 can be sealed against the conical taper surface 134 in a line-contact state. As shown in FIG. 9, the rotary valve body 121 is mounted in the cylinder main body 120 via an eccentric shaft 122, and the ventilation flow path 30 is provided by the rotary valve body 121 so as to be freely opened and closed. When the valve is closed, the valve body spherical surface 143 can be sealed against the conical taper surface 134 per line. The valve body spherical surface 143 is provided so that the center thereof is positioned on the center axis of the diameter of the cylinder main body 120.

The valve body support portion 141 is provided in a thin cylindrical shape, and is suspended from the disc body 140 at a position that is eccentric from the valve body spherical surface 143 of the disc body 140, that is, a position that is eccentric from the center P 1 of the diameter of the cylinder body 120. Are integrally formed. Following this valve body support portion 141, a shaft attachment portion 142 is formed in a substantially bowl shape. The shaft mounting portion 142 is provided at a double eccentric position that is eccentric with respect to the center of the disc main body 140 and is eccentric with respect to the valve body spherical surface 143 of the disc main body 140 in the flow direction on the spherical core side. A through hole 144 into which an eccentric shaft 122 (to be described later) can be inserted is formed in the shaft attaching portion 142.

Further, in FIG. 7, an attachment portion 145 having a predetermined inclination with respect to the horizontal direction is extended from the center of the attachment portion 142 in FIG. 7, and a weight portion is formed on the attachment portion 145. An insertion hole 146 for 123 insertion is provided. Although not shown in the drawing, the insertion hole 146 is provided with three engaging protrusions spaced at equal intervals along the hole direction.

In FIG. 10, the eccentric shaft 122 is formed with a small diameter, for example, by a metal material such as stainless steel, and a locking groove 148 for mounting two retaining rings 147 on the outer periphery thereof at substantially the same interval as the length of the shaft mounting portion 142. Is formed. The eccentric shaft 122 serves as a fulcrum during rotation of the rotary valve body 121, and a rotational moment Mc in the valve opening / closing direction is given to the rotary valve body 121 in the cylinder main body 120 via the eccentric shaft 122. .

The eccentric shaft (fulcrum) 122 is decentered by a double eccentric structure that is doubly decentered with respect to the valve body spherical surface 143 due to the positional relationship of the shaft mounting portion 142 with respect to the disc main body 140.

When the eccentric shaft 122 is formed of a metal material, it can be formed in a small diameter while maintaining the strength, and the ventilation resistance when the valve is opened can be reduced to increase the ventilation rate. By mounting the rotary valve body 121 made of a resin material on the eccentric shaft 122, the sliding resistance during the rotating operation of the rotary valve body 121 is reduced.

In this case, the eccentricity of the valve body support part 141 that supports the rotary valve body 121 with respect to the rotary valve body 121, that is, the eccentricity from the center P1 of the diameter of the cylinder main body 120 in FIG. 7 to the center P3 of the valve body support part 141. The distance (the amount of eccentricity) D1 / the radius r of the rotary valve body 121 is set to about 40%. This eccentricity is not limited to 40%, but may be in the range of approximately 35 to 40%. In this case, the same function can be exhibited.

The weight portion 123 is provided with a predetermined weight by a substantially cylindrical shape that can be inserted into the insertion hole 146, and an annular groove 149 in which an engagement protrusion can be locked is formed near the center thereof. Thus, when the weight part 123 is formed in a columnar shape, the processing becomes easy and the cost can be reduced. The weight portion 123 may be other than a cylindrical shape, and may be formed in a spherical shape, for example. In addition to this, for example, the thickness of the disc body 140 on the side where the weight portion needs to be mounted is made thicker than the other side across the eccentric shaft 122 so that the valve body weight is heavier than the other side. Thus, the weight portion 123 can be omitted.

7 to 10, the body 111 is formed in a substantially cylindrical shape by a transparent or translucent resin material, as in the above-described embodiment, and the cylinder main body 120 is mounted on the inner periphery of the body 111. A drain pipe insertion port 63 below the body 111 is integrated with the cylinder body 120. Thereby, the insertion state of the extended vent pipe 4 can be easily visually recognized from the outside of the drain pipe insertion port 63.

The cap 112 has an annular part 150 at the upper part and a connecting part 151 to the body 111 at the lower part. Between these annular part 150 and the connecting part 151, columnar parts 152 are spanned at four equal intervals. An air passage 153 is formed between the columnar portions 152. As described above, by providing the air passage 153 between the four columnar portions 152, the air passage area of the air passage 153 is increased, and a large air flow is ensured.

The connecting portion 151 is formed to have an outer diameter that can be inserted from the upper part of the body 111, and an outer peripheral convex piece 72 that can be connected to the connecting concave portion 61 formed in the body 111 and the bayonet is formed on the outer periphery of the connecting portion 151. Is done. The connecting portion 151 has an inner diameter that is approximately the same diameter as the tube insertion portion of the body 111 into which the cylinder main body 120 can be fitted.

A notch groove 154 is formed in the upper outer peripheral surface of the columnar portion 152, and the outer peripheral side of the bottom surface of the annular portion 150 has an annular shape through the notch groove 154, and this annular portion is an engaging portion 155 with the cover 113. It becomes. On the other hand, an inner circumferential flange 156 for holding the upper surface of the sheet 21 is formed on the inner diameter side of the connecting portion 151 so as to protrude toward the inner diameter side. An annular recess 157 is formed.

At the intermediate position of the cap 112, a concave portion 158 that can engage with the convex portion 133 formed near the center of the outer periphery of the cylinder main body 120 is intermittently formed at a position corresponding to the convex portion 133.

The cover 113 is provided in a substantially circular lid shape, and claw portions 160 that can be engaged with the engaging portions 155 of the cap 112 are formed at three locations on the bottom surface of the cover 113. The cover 113 is detachably provided on the top of the cap 112 via the claw 160, and is rotatable with respect to the cap 112 after being attached.

When assembling the valve unit 110, first, the weight portion 123 is inserted into the insertion hole 146 of the attachment portion 145 of the rotary valve body 121. At this time, by inserting the weight portion 123 until the engaging protrusion is locked in the annular groove 149, the weight portion 123 can be mounted at a predetermined position of the insertion hole 146 and can be prevented from falling off.

Subsequently, the rotary valve body 121 is arranged so that the disk main body 140 is along the upper surface of the cylinder main body 120, and the tip of the eccentric shaft 122 is inserted into the cylinder main body 120 from the outside of one mounting hole 130 of the rotary valve body 121. Then, after inserting the tip into the through hole 144 of the rotary valve body 121, the tip is inserted into the other mounting hole 130 from the inside of the cylinder main body 120. As a result, the rotary valve body 121 is attached to the cylinder main body 120 by the eccentric shaft 122 via the shaft mounting portion 142, and can be rotated in the cylinder main body 120. In this state, the shaft attaching portion 142 is positioned between the two

engaging grooves

148 and 148, and the retaining ring 147 is engaged with each engaging groove 148, so that the attaching portion 142 is centered on the eccentric shaft 122. Position to.

When the rotary valve body 121 is assembled to the cylinder main body 120, a gap (backlash) for rotating the rotary valve body 121 is formed between the rotary valve body 121 (shaft mounting portion 142) and the eccentric shaft 122. I need it. For this reason, when the rotary valve body 121 rotates in the valve closing direction, there is a possibility that the mounting position is shifted due to this gap and the valve body spherical surface 143 cannot be properly adhered to the conical tapered surface 134. On the other hand, if the rotary valve body 121 is held with the valve body spherical surface 143 approaching the conical tapered surface 134 and the valve body spherical surface 143 is aligned while being aligned with the conical tapered surface 134, it is ensured. The rotary valve body 121 can be tightly sealed to the conical taper surface 134.

Next, the sheet 21 is placed on the upper surface of the cylinder body 120, and the cylinder body 120 is mounted so as to cover the cap 112 from above. At this time, the projection 133 is engaged with the recess 158 so that the cylinder main body 120 can be incorporated into a predetermined position of the cap 112, and the valve unit 110 is mounted while the seat 21 is mounted between the cylinder main body 120 and the cap 112. Can be integrated. The cover 113 may be attached to the cylinder main body 120 after the cap 112 is attached, or may be attached to the cap 112 in advance.

The sheet 21 is sandwiched between the cap 112 and the cylinder main body 120 while the outer periphery thereof is in contact with the inner periphery of the cap 112 and is positioned in the radial direction. After the seat 21 is mounted, a space T is provided between the annular recess 157 and the inner diameter side of the seat 21, and the flexibility of the tapered tapered surface 134 is ensured by this space T.

Finally, the body 111 is mounted on the valve unit 110. In this case, the connecting portion 151 of the valve unit 110 is inserted from the body opening side, and the outer peripheral convex piece 72 formed on the cap 112 and the connecting concave portion 61 of the body 111 are attached by bayonet connection. After the integration, the cap 112 (valve unit 110) is prevented from falling off from the body 111 and sealed with an O-ring 161 provided on the outer periphery of the lower portion of the cap 112. To prevent leakage between them. Since the cap 112 is detachable from the body 111, it can be freely removed from the body 111 to perform maintenance and the like.

In the valve main body 100 of this embodiment, the rotary valve body 121 for the vent valve has a rotational moment Mo that rotates in the valve opening direction and a rotational moment Mc that rotates in the valve closing direction via the eccentric shaft 122 that is a fulcrum. The rotary valve body 121 exhibits a vent valve function. In this case, in FIG. 7, when the rotational moment acting on the entire rotary valve body 121 around the eccentric shaft 122 is a counterclockwise direction (a negative rotational direction), the rotary valve body 121 is in the valve opening direction. When it rotates and is in the clockwise direction (positive rotation direction), the rotary valve body 121 rotates in the valve closing direction.

The rotational moment Mo rotating in the valve closing direction is obtained by at least “self-weight of the rotary valve body 121” and increases when the rotary valve body 121 receives a negative pressure.
Further, the rotational moment Mc rotating in the valve closing direction is obtained by the “weight portion 123”.
Therefore, in the vent valve in the present embodiment, the rotational moment Mo and the rotational moment Mc are always applied to the rotary valve body 121, so that at least the negative pressure is eliminated as at atmospheric pressure or positive pressure. In this case, a rotational moment that rotates in the positive rotational direction works and the valve is closed.

In this case, the rotary valve body 121 is rotatably incorporated in the cylinder main body 120 via the above-described eccentric shaft 122, so that the rotary valve body 121 is disposed at a position where the valve main body 140 is opened by its own weight. The valve is closed due to the balance with the weight 123 provided on the disc main body 140.

At the time of negative pressure in the cylinder main body 120, based on the differential pressure generated inside and outside of the rotary valve body 121, a rotary moment that the rotary valve body 121 rotates in the negative rotation direction works, and this rotary moment rotates in the valve opening direction. A first unbalance torque is generated to allow air to be sucked from the outside. On the other hand, at the time of atmospheric pressure or positive pressure in the cylinder main body 120, a rotational moment that the rotary valve body 121 rotates in the positive rotational direction works due to the balance with the weight portion 123, and the rotational moment that rotates in the valve closing direction acts. Generate balance torque.

As described above, the unbalance torque (or unbalance rotation moment) of the valve body 1 of the first embodiment described above is “the rotational force in the opening direction based on the differential pressure generated inside and outside the valve body, and the inside and outside of the valve body. The unbalance torque of the valve main body 100 of the second embodiment is generated by the rotational moment in the positive and negative rotational directions acting on the rotary valve body 121. It is a rotational force. From this, the valve body 100 of this embodiment is not limited to the case where the pressure difference between the inside and outside of the rotary valve body 121 is eliminated, that is, the case where the pressure difference between the inside and outside of the rotary valve body 121 is 0 (at atmospheric pressure), When a rotational moment in the positive rotational direction is applied to the rotary valve body 121 including when positive pressure is applied, the rotary valve body 121 rotates in the valve closing direction.

In this case, the valve body support portion 141 is formed at an eccentric position, and the large pressure receiving surface 42 and the small pressure receiving surface 43 are provided. The body 121 is rotated by its own weight toward the large pressure-receiving surface 42 side and tries to be in the valve open state. However, by providing the weight portion 123 on the small pressure-receiving surface 42 side, the rotating valve body 121 that is to open the valve with its own weight is maintained in the valve-closed state due to the balance with the weight portion 123 at the normal time. It has become.

As described above, the rotary valve body 121 has a rotational moment in the opening and closing direction, and the rotary valve body 121 is configured to open and close by itself using this rotational moment. Responsiveness to negative pressure can be adjusted. Since the rotary valve body 121 rotates around the eccentric shaft 122 when negative pressure is generated, it takes time to open the rotary valve body 121 and is not easily affected by pressure fluctuations. When the valve is opened, the rotating moment Mo in the valve opening direction is operated until the negative pressure is completely eliminated, so that the rotating valve body 121 is maintained in the open state, and the rotating valve body 121 naturally rotates in the valve closing direction. To prevent. Accordingly, the valve body spherical surface 143 does not repeatedly come in contact with the conical taper surface 134, and chattering can be prevented. Therefore, it is possible to prevent the occurrence of noise during drainage and to open and close while maintaining quietness.

Since the fulcrum is provided by the eccentric shaft 122 having a double eccentric structure, the sealing performance when the valve is closed can be exhibited while minimizing the sliding range between the conical taper surface 134 and the valve body spherical surface 143. The opening / closing operation of 121 also becomes smooth.
In the vent valve of the present embodiment, in FIG. 11, the amount of eccentricity (eccentric distance D1 / radius r of the rotary valve body 121) is about 35% to 45%, which is larger than the value employed in a general butterfly valve. More preferably, it is set to about 40%. Thus, by increasing the amount of eccentricity, the contact angle J between the conical taper surface 134 and the valve body spherical surface 143 is formed with respect to the center P1 of the flow path. Can be provided smaller than the taper angle ε formed by the conical taper surface 143 with respect to the center P1 of the flow path.

Therefore, according to the vent valve of the present embodiment, when a negative pressure exceeding a predetermined value is generated, the valve body spherical surface 143 that is the sealing surface of the rotary valve body 121 is instantaneously separated from the conical taper surface 134. The body 121 can smoothly operate in the valve opening direction, and can be stopped at a predetermined valve closing position by preventing overrun in the closing direction of the rotary valve body.
Further, since sliding resistance between the valve body spherical surface 143 and the conical tapered surface 134 can be suppressed, the valve seat sealing performance can be maintained over a long period of time.

Although not shown, the distance from the disc main body 140 to the eccentric shaft 122, the distance from the eccentric shaft 122 to the weight portion 123 (attachment portion 145), the inclination angle of the attachment portion 145, the weight of the weight portion 123, etc. are preset. Thus, it is possible to provide a valve body 100 that can obtain a rotational moment of a predetermined magnitude when the valve is opened and closed, and that can reliably eliminate a minute negative pressure.

In the present embodiment, the peak of the valve closing force of the rotary valve body 121 is set so that the valve opening degree is 25%, so that the rotary valve body 121 has a minute opening position near the fully closed position, for example, When the valve opening is 5%, the valve closing force at this valve opening is smaller than the valve closing force at the valve opening of 25%. As the pressure in the pipe changes, the valve opening force, that is, the rotational moment Mo that rotates in the valve opening direction also changes, and the rotary valve body 121 swings, but the valve closing direction rotational moment and the valve opening direction rotational moment are balanced. In the fine opening range, it is possible to prevent the seat 21 from being shockedly seated and to prevent the chattering phenomenon.

On the other hand, even when the valve closing force peak of the rotary valve body 121 is set to be 50%, the rotary valve body 121 has a valve opening degree as in the case of the valve opening degree of 25%. When the opening position is smaller than 50%, the valve closing force becomes smaller than the valve closing force at the valve opening degree of 50%, and the same function is exhibited.

If the valve closing force peak of the rotary valve body 121 is set to be less than 5%, the difference in valve closing force from the valve closing state becomes small, and the negative pressure is relieved from this state. According to the relaxation, the rotary valve body 121 is likely to reach the valve closed state, and there is a possibility that the minute negative pressure cannot be relaxed by sitting on the seat 21 immediately.

On the other hand, if the valve closing force peak of the rotary valve body 121 is set so as to exceed 50% of the valve opening degree, when the negative pressure is generated, the state of more than half is maintained in the opening range where the valve opening degree is large. Therefore, it takes time to reach the valve closed state, and the risk of odor leakage from the extended vent pipe 4 and the drain pipe 3 increases.

Here, in FIG. 12, a schematic sectional view of a double eccentric valve body 100 according to the present invention is shown. For comparison with the valve body 100, FIG. 13 shows a schematic view of a conventional ventilation apparatus having various structures, and the inner diameter φd of the ventilation channel 30 of these ventilation apparatuses is shown in FIG. The inner diameter φd is approximately the same size and has the same flow area.

In the ventilation device 170 shown in FIG. 13A, an annular valve body 171 is provided in a housing 172 so as to be able to move up and down. Normally, the valve body 171 is seated on the valve seat 173 by its own weight and is in a valve-closed state. . When the negative pressure is generated, the valve body 171 is lifted from the valve seat 173 and the valve is opened to reduce the negative pressure. A cap 174 is provided integrally with the housing 172 above the valve body 171.

A ventilation device 180 shown in FIG. 13B is obtained by adding a compression spring 181 between a valve body 171 and a cap 174 to the self-weighting ventilation device of FIG. In the direction, the elastic force of the compression spring 181 works in addition to the dead weight of the valve body 171.

A ventilation device 190 shown in FIG. 13C has a structure in which a valve body 191 is cantilevered via a shaft mounting portion 192. The valve body 191 is rotatably mounted in a housing 193 by a so-called swing check type. ing.

14 is a graph showing the valve closing force-valve opening characteristics of the valve body itself for the valve main body 100 of FIG. 12 and the

ventilation devices

170, 180, 190 of FIG. The left vertical axis shows the valve closing force.

“Valve opening”, which is the horizontal axis of the graph, refers to the lift amount (fully opened lift amount) of the valve body 171 for the

ventilation devices

170 and 180 by the self-weight valve body 171 in FIGS. 13 (a) and 13 (b). Ratio [%]). On the other hand, regarding the valve main body 100 in which the rotary valve body 121 of FIG. 12 swings around the eccentric shaft 122 and the swing check type ventilation device 190 of FIG. 13C, the rotary valve body 121 and the valve body 191 are respectively provided. Of the rotation angle (ratio [%] to the fully opened position).

“Valve closing force”, which is the vertical axis of the graph, means the force acting in the valve closing direction of the valve body 171 (the self-weight of the valve body 171) for the

venting devices

170 and 180 in FIGS. 13 (a) and 13 (b). And the total elastic force of the compression spring 181). On the other hand, for the valve main body 100 in FIG. 12 and the ventilation device 190 in FIG. 13C, the magnitudes of the rotational moments when the rotary valve body 121 and the valve body 191 rotate in the closing direction are shown.

In FIG. 14, for the valve main body 100 of FIG. 12 according to the present invention, the characteristic that the peak of the valve closing force of the rotary valve body 121 is set at a valve opening θ = 30 ° is shown by a graph a, and the valve opening θ The characteristic set at = 20 ° is shown in graph b.
Further, the valve closing force in the fully closed state of the valve main body 100 of the present invention and each of the

venting devices

170, 180, and 190 shown in FIG. The valve seat sealability is set to a value that can be secured.
For comparison of each characteristic, the value of the valve closing force in the fully closed state of the graphs b to e is set to the same value Ps.

As shown in the graph, in the case of the valve main body 100 of the present invention, the peak (Pbp) of the valve closing force of the rotary valve body 121 is set to a valve opening θ = 20 ° for a and valve opening θ = 30 ° for b. By setting each, in any case, the peak (Pbp) of the valve closing force at the intermediate opening becomes larger than the valve closing force (rotational moment) in the valve closed state. Thus, with the valve closing force Ps in the fully closed state as a reference, in each graph, the slope indicated by the expression “variation in valve closing force” / “variation in valve opening” is a positive value greater than zero. By setting the value, the peak of the valve closing force is surely at the position of the intermediate opening, and the peak of the valve closing force can be set at an arbitrary angle from the fully closed valve opening to the fully opened position. For example, as will be described later, this action can be obtained by inclining the weight portion 123 toward the vent pipe 4 with respect to the horizontal direction parallel to the seat (valve seat) 21 via the mounting portion 145. .

In this case, the valve closing force Pas in the fully closed state in the graph a is set lower than the valve closing force Ps in the fully closed state in the graph b. Thereby, the graph a can reduce the pressing force between the seat 21 and the rotary valve body 121 in the valve-closed state and maintain the valve seat sealing performance over a long period of time, and can also perform the valve opening operation when the negative pressure is generated. The reaction can be improved.

The valve seat sealability can be enhanced as required by changing the flexibility and adhesion of the seat 21 such as the material of the seat 21 and the formation of a gap on the back surface of the seal surface. When the valve seat sealability is set low, the pressure responsiveness is improved, the valve opening operation is facilitated even when the negative pressure is very small, and the effect of reducing the noise due to the drainage sound in the vent pipe due to the negative pressure is also exhibited.

In the graph b, the valve opening operation by negative pressure will be described.
In the valve body 100 shown in the graph b, when a negative pressure is generated in the pipe and a force acting in the valve opening direction larger than Ps, that is, a valve opening force is generated, the rotary valve body 121 opens from the closed state. Since the rotary valve body 121 has a characteristic that the valve closing force increases in a substantially cosine curve as the valve opening angle increases from the valve closed state (0 °), the valve closing force reaches a peak (Pbp). In between, the valve opening force due to the negative pressure in the pipe and the valve closing force of the valve body are positioned at an opening degree that balances.

In other words, the “rotational moment in the valve opening direction of the rotary valve body 121” due to the normal negative pressure in the assumed piping causes the rotary valve body 121 to be “fully closed to the peak of the valve closing force (Pbp)”. The rotation moment in the closing direction of the rotary valve body 121 by the weight portion 123 of FIG. 7 is set so that the opening degree is balanced within the range of opening degree. In this region α (Ps <P <Pbp), the rotary valve body 121 is in the vicinity of a position where the rotational moment in the valve opening direction and the rotational moment in the valve closing direction balance even if a slight pressure fluctuation occurs in the pipe. Therefore, chattering does not occur without sitting on the valve seat (seat) 21.

In a region where a large negative pressure is generated in the pipe and exceeds the normal negative pressure and exceeds the peak (Pbp) of the valve closing force, the valve closing force of the rotary valve body 121 conversely increases to Pbo in a substantially cosine curve. Since it is reduced, the difference from the negative pressure in the pipe increases, the valve opening increases quickly and increases, and the maximum ventilation is performed by increasing the total area of the opening (vent flow path 30) associated with the valve opening. This will quickly relieve the negative pressure in the pipe.

Next, the valve closing operation accompanying the negative pressure reduction in each vent valve will be described.
In the valve main body 100 (graph b), the rotary valve body 121 secures the maximum ventilation amount in a state where the valve is opened at the maximum angle (80 ° in this embodiment) due to a large negative pressure in the pipe. As the valve opening increases, the rotational moment in the closing direction of the rotary valve body 121, that is, the minimum valve closing force (Pbo) is obtained, but the force in the valve opening direction is also extremely reduced due to negative pressure relaxation. The valve closing operation starts when the rotational moment in the closing direction of the valve body 121 exceeds the rotational moment in the valve opening direction which has been reduced by ventilation and becomes smaller. At the start of this valve closing operation, since the rotational moment in the closing direction of the rotary valve body 121 is small, the rotary valve body 121 starts to operate slowly and operates at an acceleration in the valve closing direction until the peak of the valve closing force is reached.

Here, in the region where the valve closing force P is a value of Pbp> P> Pbo, that is, in the region of a large valve opening, the rotary valve body 121 is “change amount of valve closing force” / “change of valve opening”. By setting the slope indicated by the expression "amount" to a negative value, the valve opening angle is maintained at a position where the rotational moment in the valve closing direction balances the rotational moment in the valve opening direction with respect to pressure fluctuations occurring in the piping. .

When the negative pressure continuously relaxes, that is, when the negative pressure continues to decrease, the rotary valve body 121 is coupled with the rotational moment increasing in the closing direction to balance the rotational moment in the valve opening direction. The valve operates greatly in the valve closing direction toward the peak of the valve closing force.

Thereafter, after the rotary valve body 121 operating in the valve closing direction reaches the peak (Pbp) of the valve closing force, the valve is further fully closed until the rotational moment in the valve closing direction is balanced with the rotational moment in the valve opening direction. The rotation moment in the valve closing direction of the rotary valve body 121 acts in a direction that reduces the valve closing operation of the rotary valve body 121 (a direction that prevents the valve closing operation). The motion is decelerated and balanced. For this reason, the chattering phenomenon can be prevented or alleviated without the rotary valve body 121 and the valve seat 21 contacting each other.

Thus, the valve body 100 has a substantially cosine curve-like valve closing force characteristic that has a peak of the valve closing force at an intermediate opening from fully closed to fully open. Even if a negative pressure fluctuation occurs, the rotary valve body 121 oscillates within the range from 0 to the peak of the valve closing force (Pbp) (intermediate opening: 5 ° to 50 °). Chattering can be prevented or alleviated.

Further, when the rotary valve body 121 is fully opened in response to a large sudden negative pressure generated in the piping, the negative pressure is relieved by securing the air flow rate, and after the valve is closed, it is sensitive to pressure fluctuations. If the valve is not closed in response to the negative pressure, and the valve closing operation continues to the α range due to continuous negative pressure, the valve closing operation decelerates at an intermediate opening (5 ° to 50 °). Since the valve closing force and the valve opening force are balanced, chattering can be suppressed.
In this embodiment, the valve closing force characteristic is a substantially cosine curve. However, for example, the characteristic of the angle before and after Pbp may be changed by freely changing the number, shape and arrangement of the weight parts 123.

On the other hand, in the case of the self-weighting ventilation device 170 of FIG. 13A, the valve opening force is constant from the fully closed state to the fully opened state as shown in the graph c. For this reason, when a negative pressure exceeding the valve closing force is generated in the pipe, the valve opening force is always larger than the valve closing force Ps of the valve body 171. Therefore, an unstable behavior is exhibited in accordance with pressure fluctuations in an attempt to balance the amount of air flow depending on the degree of valve opening. When drained by a residential sewage pipe or the like, sudden negative pressure occurs, and the valve body 171 moves in the opening direction. After that, when a large swing back occurs due to negative pressure cancellation, the valve closing force becomes relatively large. The valve body 171 is in a fully closed state, the valve opening degree cannot be maintained, and chattering is likely to occur according to the fluctuation of the negative pressure.

In the case of the ventilation device 180 in FIG. 13B, the elasticity of the compression spring 181 works in the valve closing direction in addition to the dead weight of the valve body 171, so that the valve opening increases as shown in the graph d. Along with this, the valve closing force increases proportionally. For this reason, when the negative pressure is reduced in the intermediate opening degree or the fully opened state, that is, the negative pressure in the pipe is in the region α (Ps <P <Pbp) and the region β (Pbp <P <Pdo), the compression spring 181 The elastic force is released, and the valve body 170 vigorously performs the valve closing operation. Therefore, the valve body 171 is less likely to follow the fluctuation of the negative pressure, and the valve opening degree cannot be maintained in the minute opening range, so that chattering is likely to occur according to the fluctuation of the negative pressure.

In the case of the swing check type (cantilever type) ventilation device 190 of FIG. 13C, as shown in the graph e, the valve closing force (the rotational moment of the valve body 191) increases as the valve opening increases. The slope becomes smaller, and the slope indicated by the expression “change amount of valve closing force” / “change amount of valve opening” is a negative value smaller than zero. Therefore, the valve body 191 has a structure that is difficult to return to the fully closed state even when the negative pressure is relieved at the intermediate opening or the fully opened state.

On the other hand, since the valve closing force of the ventilator 190 is the largest at the valve closed position, the valve body 191 of the ventilator 190 is generally less likely to follow the fluctuation of the negative pressure and keeps the valve opening in the small opening region. Since chattering is not possible, chattering is likely to occur according to the fluctuation of negative pressure.
In this ventilator 190, the valve closing force becomes substantially zero near 90 degrees structurally, so it is difficult for the valve body 191 to return to the valve closed state. Therefore, it is necessary to regulate the valve opening degree that is fully opened in advance, which leads to a decrease in the air flow rate when the valve is opened.

Here, in the valve body 100 of FIG. 12, the ventilation channel 30 has a straight shape, and there is no need for an intake channel on the larger diameter side than the inner diameter φd of the ventilation channel 30. It is possible to eliminate the negative pressure while suppressing the pipe diameter to be equal to or less than that of an external pipe (vent pipe) such as the extended vent pipe 4 of FIG. Furthermore, during the ventilation, the rotary valve body 121 rotates until it is in a direction substantially parallel to the flow direction of the ventilation channel 30, so that a sufficient ventilation rate can be secured while minimizing the ventilation resistance.

On the other hand, in the case of the

ventilation devices

170 and 180 shown in FIGS. 13A and 13B, when securing the same inner diameter φd of the ventilation channel 30 as that of the valve body 100 shown in FIG. In addition, the intake channel 175 is required on the side of the expanded diameter (outer diameter), and the entire diameter is expanded to the size of the outer diameter φD of the intake channel 175. For this reason, a space for installing the

ventilation devices

170 and 180 is required more than the piping space of the ventilation pipe.

Also in the case of the ventilation device 190 of FIG. 13C, the cantilever bearing 192 is located outside the outer diameter φD of the intake flow path 195 that is on the outer diameter side of the inner diameter φd of the ventilation flow path 30. As in the case of FIGS. 13 (a) and 13 (b), the whole is increased in size in the outer diameter direction, making it difficult to make it compact, and a large installation space is required.

FIG. 15A shows another graph showing the relationship between the valve opening degree and the valve closing force. In the same figure, the characteristic that the peak of the valve closing force of the rotary valve body 121 is set to a valve opening degree θ = 40 ° (valve opening degree 50%) is shown by a graph a, and the valve opening degree θ = 5 ° (valve opening). The characteristic set at 5%) is shown by graph g. The characteristics of the respective states shown in the graphs b to e other than these are as described with reference to FIG.

As shown in the graph a, when the valve closing force peak of the rotary valve body 121 is 50%, the ratio from the fully closed time to the valve opening 50%, The ratio from the opening degree 50% to the fully opened state is the same. If, from this state, the peak of the valve closing force of the rotary valve body 121 is set to exceed 50% of the valve opening degree, the ratio of the valve open state when the negative pressure is generated increases, and the valve open state is It becomes longer than necessary. For this reason, the risk that odor leakage will occur from the drain pipe 3 and the extended vent pipe 4 connected to the valve body 100 increases.

As shown in the graph g, when the peak of the valve closing force of the rotary valve body 121 is set to be less than 5%, the operation of the rotary valve body 121 from the valve opening to the valve closed state at the peak time. The range becomes narrower. In addition, the difference between the magnitude of the valve closing force at the peak when the valve is closed and the magnitude of the valve closing force when the valve is fully closed is reduced. Accordingly, when the negative pressure is relieved, the rotary valve body 121 is likely to reach the valve closed state according to the relieving, and there is a possibility that the minute negative pressure cannot be relieved.

Subsequently, the valve closing force-valve opening characteristic shown in the graph of FIG. 15A will be described based on the relationship with the negative pressure fluctuation. FIG. 15B shows the fluctuation of the negative pressure from the generation of the negative pressure of the valve main body 100 to the cancellation of the negative pressure in the above embodiment, and the negative pressure generated when the negative pressure is canceled by the valve main body 100. Represents an example of the change. The alternate long and short dash line in FIG. 15B represents the magnitude of the valve closing force in the fully closed state with respect to the magnitude of the negative pressure, and corresponds to Ps (Pas) in FIG.

In FIG. 15B, when the inside of the drainage pipe 3 changes from the atmospheric pressure (1) state to a negative pressure and exceeds a predetermined negative pressure (2), that is, the valve closing force in the fully closed state, the rotary valve body 121 Start operation in the opening direction. At this time, the rotary valve body 121 opens to a maximum negative pressure (3) generated in the drainage pipe 3 by opening the valve closing force beyond the valve opening degree at which the valve closing force exhibits a peak value (Pbp in FIG. 15A). In contrast, it is designed to provide sufficient ventilation.

When the negative pressure is reduced by this ventilation and the negative pressure is reduced to the state of (4), the rotary valve body 121 operates in the closing direction due to the decrease of the negative pressure. At this time, when the negative pressure in the drain pipe 3 cannot be alleviated (5), the rotary valve body 121 is not closed until the valve opening degree at which the valve closing force exhibits a peak value, and the valve is operated until the valve is fully closed. It will not reach. When the rotary valve body 121 is slightly closed, the air flow rate is reduced, so that the negative pressure rises to the state (5). Along with this, the rotary valve body 121 opens again.

In this way, by rotating the rotary valve body 121 with respect to negative pressure, and when the negative pressure drops, the rotary valve body 121 operates in the valve closing direction and repeats opening again with respect to the negative pressure. To relieve negative pressure. Thereby, even if the magnitude of the negative pressure changes from the state of (5) to the states of (6), (7), (8), the rotary valve body 121 falls below the opening that exhibits the peak value. Otherwise, chattering will not occur from the generation of negative pressure to the reduced state of negative pressure by repeating the swing (opening / closing operation) without reaching the valve closed state.

The rotary valve body 121 relaxes the negative pressure to the states of (9) and (10) while exhibiting a so-called brake function, and when the negative pressure relaxes, the rotary valve body 121 falls below the opening that exhibits the peak value. When the magnitude of the negative pressure falls below the predetermined negative pressure state Ps, (12), the rotary valve body 121 is fully closed.
As a result, the inside of the drain pipe 3 returns to the atmospheric pressure (1) state, and the fully closed state is maintained in this atmospheric pressure state.

As a comparison with the valve main body 100 of the present embodiment, in the case of the ventilation device 170 having the self-weight valve body 171 of FIG. 13A, in the graph shown in FIG. ), The valve body 171 operates in the opening direction when the pressure becomes negative and exceeds a predetermined negative pressure (2).
In this case, as shown in the graph c of FIG. 15A, the peak of the valve closing force at the intermediate opening of the valve body 171 is not set, and the valve closing force is constant. Therefore, the negative pressure (2), (3), (5), (6), (7), (8), (10), (11) shown in FIG. In the state, the valve body 171 easily returns to the valve closed state. At this time, if the negative pressure in the pipe is larger than the predetermined negative pressure (2), the valve body 171 opens again. As a result, in each of these relaxed states, the valve opening / closing operation is repeated, and chattering is likely to occur.

In the case of the ventilation device 180 of FIG. 13B, a compression spring 181 is added to the ventilation device 170 of FIG. 13A, and the valve body 171 is urged by the compression spring 181 in the valve closing direction. ing. Therefore, as shown in the graph d of FIG. 15A, the peak of the valve closing force at the intermediate opening of the valve body 171 is not set, and (3), (5), ( 6), (7), and (11), the valve body 171 is likely to reach the fully closed state vigorously due to the reaction force of the compression spring 181. As a result, as in the case of the ventilation device 170 in FIG. 13A, the valve opening / closing operation is repeated every time the negative pressure is reduced, and chattering is likely to occur.

In the case of the swing check type ventilator 190 of FIG. 13C, the peak of the valve closing force is set at the fully closed position as shown in the graph e of FIG. It gradually becomes stronger from the state toward the fully closed state.
For this reason, the generation of the negative pressure in FIG. 15B facilitates opening of the valve body 191. When the inside of the pipe exceeds the predetermined negative pressure (2), the valve opening operation is immediately started.
If the valve body 191 is in the fully opened position, for example, the negative pressure varies from (3) to (4), and the valve body 191 may operate from the fully opened state to the fully closed state, and chattering is likely to occur. Become.

In the present embodiment, when the weight portion 123 is in a horizontal position with respect to the eccentric shaft 122, a force in the vertical direction (tangential direction with respect to the outer periphery of the eccentric shaft 122) acts on the eccentric shaft 122. The rotational moment due to the valve becomes the maximum and the valve closing force peaks. In this way, by adjusting the inclination angle of the mounting portion 145 in advance, the peak of the valve closing force of the rotary valve body can be set to any opening between the valve opening fully closed and fully opened.

When the valve closing force peak of the rotary valve body 121 is set to be 25% as in the present embodiment, the angle of the mounting portion 145 is approximately 30 with respect to the horizontal direction as shown in FIG. It may be provided with an inclination of °. On the other hand, when the peak of the valve closing force of the rotary valve body 121 is set to be 50%, the angle of the attachment portion 145 may be provided with an inclination of about 50 ° with respect to the horizontal direction.

When the valve is closed, the valve body spherical surface 143 seals in a tangential contact state with the conical taper surface 134 to exhibit high sealing performance. Furthermore, the tangential contact and the valve body spherical surface 143 and the conical taper surface 134 are on the flow path side. Condensation when the valve is closed can be prevented by having a shape inclined toward.

16 and 17 show a third embodiment of the vent valve of the present invention.
This ventilation valve (valve body 100) is used as an in-line check valve in a lateral flow path with an external pipe 201 connected to the primary side and the secondary side. In the figure, the left side of the rotary valve body 121 shows the primary side, the right side shows the secondary side, FIG. 16 shows the valve closed state, and FIG. 17 shows that the fluid (for example, air) flows from the primary side to open the valve. It shows the state that is in the (fully open) state.

In this embodiment, the mounting hole 204 of the attachment portion 203 for attaching the weight portion 123 of the rotary valve body 202 is formed so as to extend from the eccentric shaft 122 in a direction substantially perpendicular to the disc main body 140. The valve opening restricting portion 132 is located at a position where the rotary valve body 202 can be returned to the valve closed state by the weight portion 123 attached to the insertion hole 204 when the valve is fully opened in FIG. It is provided so as to be a position slightly inclined in the valve closing direction.
A cylindrical connecting body 205 is connected to the body 111 via an O-ring 161, and an external pipe 201 is connected via the connecting body 205.

With such a configuration, the valve body spherical surface of the rotary valve body 202 is normally applied by applying a clockwise force around the eccentric shaft 122 to the rotary valve body 202 due to the weight of the weight portion 123 as shown in FIG. 143 tightly seals with the conical taper surface 134 of the seat 21 to maintain the valve closed state and prevent backflow from the secondary side.

On the other hand, when fluid pressure is applied from the primary side, the rotary valve body 202 rotates counterclockwise against the weight of the weight portion 123 by this fluid pressure, and the valve flows into the valve open state of FIG. At this time, since the weight of the weight portion 123 is maintained in the valve closing direction, the rotary valve body 202 is rotated clockwise by the weight portion 123 when the fluid pressure on the primary side disappears, and FIG. It operates smoothly until the valve is closed and reliably returns to the sealed state.

Similar to the above-described embodiment, the peak of the valve closing force of the rotary valve body 202 is set to an intermediate opening of the rotary valve body 202, that is, between the valve opening fully closed and fully open, When a minute pressure is generated, the fluid can be flowed in a state where the valve opening degree of the intermediate opening degree is maintained. At this time, even if a pressure change occurs, the rotary valve body 202 operates in a stable state. Therefore, it is possible to prevent the occurrence of chattering by preventing a minute opening / closing operation.

18 and 19 show a fourth embodiment of the vent valve of the present invention.
In the valve main body 80 of this embodiment, a cylinder main body 81 is integrally provided as a valve unit, and a seat 82, a disc-shaped valve body 83, a rotating shaft 84, and a weight portion 85 are provided in the cylinder main body 81. A rectangular penetrating portion 86 for attaching the rotating shaft 84 is formed at a position near the inner periphery of the cylinder main body 81, and a mounting portion described later provided on the rotating shaft 84 on the outer diameter side of the penetrating portion 86. 87 and an accommodating portion 88 in which the weight portion 85 is accommodated.

In the figure, the seat 82 is formed by projecting an annular projecting seal portion 90 at the bottom, and the projecting seal portion 90 can contact and seal the valve seat contact surface 91 of the disc-like valve body 83. Provided. The seat 82 is mounted so as to be sandwiched between the cylinder main body 81 and the cap 12 while being placed on the stepped surface 92 formed on the upper inner periphery of the cylinder main body 81. The stopper seal ring 83 can be closed by stopping the valve 83 at the valve closing position.

The disc-like valve body 83 is formed in a substantially arc-shaped cross section having a larger diameter than the diameter of the projecting seal portion 90 of the seat 82, and at this time, a valve seat abutment surface 91 that is a contact side with the seat 82 is formed. In this state, contact with the ridge seal portion 90 of the sheet 82 is possible by contact with the line. In the central part of the bottom surface of the disc-shaped valve body 83, a square-shaped concave portion 93 is formed.

The rotary shaft 84 is formed with a diameter that can be loosely fitted into the through-hole 86 on the attachment side to the cylinder main body 81, and protruding locking portions 94 are formed on both sides of the rotary shaft 84. A mounting portion 87 for the weight portion 85 is formed to extend from the rear end side of the rotating shaft 84 (on the outer diameter side of the cylinder body 81), and a weight portion 85 having an appropriate weight amount is formed on the mounting portion 87. It is fixed.

A substantially L-shaped arm member 95 is integrally provided on the distal end side (inner diameter side of the cylinder main body 81) with respect to the rotating shaft 84, and a diameter that can be loosely fitted in the rectangular recess 93 at the distal end portion of the arm member 95. The spherical portion 96 is formed.

The rotary shaft 84 is loosely fitted into the through-hole 86 and is attached to the cylinder main body 81 in a state of being prevented from coming off by the protruding locking portion 94, whereby the arm member 95 is rotated in the valve opening / closing direction around the rotary shaft 84. It becomes possible. The spherical portion 96 at the tip of the arm member 95 is attached to the rectangular recess 93 of the disc-like valve body 83, and the holding member 97 is attached from above, thereby being attached by a universal joint structure.

With such a configuration, the valve diameter is substantially the same as the diameter of the elongated vent pipe (pipe) 4, and the rotation shaft 84 is provided near the inner periphery of the cylinder body 81, and is provided on the rotation shaft 84. In this case, the disc-like valve body 83 is provided so as to be openable and closable with respect to the stopper seal ring 82 via the arm member 95. An unbalance torque that rotates in the valve opening direction via the rotating shaft 84 during pressure generation is generated to allow air to be sucked in from the outside. When the inside of the cylinder main body 81 is at atmospheric pressure or positive pressure, the weight 85 An unbalance torque that rotates in the valve closing direction is generated via the rotating shaft 84, and the valve is closed.

At this time, the disc-shaped valve body is caused by the moment in the valve opening direction according to the distance D3 from the center P4 of the rotating shaft to the center P5 of the spherical portion 96 and the weight 85 disposed on the opposite side of the disc-shaped valve body 83. Since the moment in the valve closing direction due to its own weight can be offset, even if the rotational moment acting on the disc-like valve element 83 when the valve is opened due to the negative pressure is small, for example, with a negative pressure of about 30 to 50 Pa. Since the valve can be easily opened, the valve body 80 having excellent responsiveness can be provided.

In addition, the valve body 80 only needs to have a valve chamber having a width only in the range of rotation of the disc-like valve body 83, so that the vent valve has a structure having a valve chamber that needs to be provided outside the vent pipe. In comparison, the delay is less likely to occur, and when a negative pressure is generated in the pipe, the valve is immediately opened to eliminate the negative pressure.

In this embodiment, the weight portion 85 is provided to maintain the valve closed state at atmospheric pressure or positive pressure. However, the present invention is not limited to this, and a part of the disc-shaped valve body 83 is thickened, or The function of this weight may be exhibited while reducing the weight of the weight part by changing the material or the like.

The embodiment of the present invention has been described in detail above, but the present invention is not limited to the above-described embodiment, and the scope does not depart from the spirit of the invention described in the claims of the present invention. Thus, various changes can be made.
For example, the vent valve of the present invention can be inserted into an inspection port of a drain pipe system in addition to an extended vent pipe or overflow edge, or to eliminate negative pressure in the vent pipe or drain pipe. In addition to use as a ventilation valve, an air valve, and an intake valve, it can also be applied as a vacuum breaker that eliminates the vacuum in the piping.

The vent valve of the present invention may be placed directly in the wall of an apartment house or the like, which is a piping space for the vent pipe, or may be built in a resin box and placed in the wall. Thus, when arrange | positioning the ventilation valve concerning this invention in a partition wall, it is good to arrange | position so that a rotating shaft may become parallel to the longitudinal direction of a wall surface or a box. According to such an arrangement, the weight provided orthogonal to the rotation axis is in a position to rotate in the longitudinal direction and can rotate with the inclination of the vent valve being small. Can be kept in.

In addition, the vent valve of the present invention has been described using the valve unit structure, but the present invention is not limited to this, and a valve mechanism other than the unit structure such as rotatably supporting the rotating shaft of the valve body by a body is provided. The present invention can also be applied to a vent valve having the same.
Furthermore, the internal mechanism of the vent valve of the present invention can be applied to various pipelines other than the vent valve.
The rotary valve mechanism using the eccentric structure valve body in the present invention can also be used for various equipment and devices other than the vent valve.

1, 80, 100 Valve body 2 System body 3 Drain pipe 4 Elongating vent pipe (external drain pipe)
10, 110

Valve unit

11, 111

Body

12, 112

Cap

20, 81, 120 Tube body 21

Valve seat

23, 83, 121 Disc-shaped

valve body

24, 84, 122 Eccentric shaft 35 Valve seat surface 41 Valve seat contact surface 42 Large pressure receiving surface 43 Small

pressure receiving surface

50, 85, 123 Weight portion 63 Drain pipe insertion port 82 Stopper seal ring (sheet)
83, 121, 202

Rotating valve element

95, 141 Arm member (valve element support part)
134 Conical taper surface 143 Valve body spherical surface D1, D2, D3 Eccentric distance P1 Center of diameter of cylinder body P2 Center of valve body seal surface P3 Center of valve body support part

Claims

A disc-shaped valve body is provided in the cylinder body so as to be freely rotatable via a rotating shaft. The disc-shaped valve body can be opened via the rotating shaft during negative pressure in the cylinder body. An unbalance torque that rotates in the valve opening direction is generated so that the atmosphere can be sucked in from the outside, and the cylinder body rotates in the valve closing direction via the rotating shaft at atmospheric pressure or positive pressure. A vent valve configured to generate a balance torque to be in a closed state.
The rotating shaft is an eccentric shaft having a double eccentric structure that is eccentrically doubled, and the pressure receiving area of the disc-shaped valve body is determined by a large pressure receiving surface and a small pressure receiving surface with the axis of the rotating shaft as a boundary. The vent valve according to claim 1.
3. The vent valve according to claim 2, wherein the eccentric shaft is configured to adjust the vent valve function by appropriately setting an eccentric amount by changing an eccentric distance.
The valve-closed state of the disc-shaped valve body is maintained by making the weight of the valve body on the small pressure receiving surface side heavier than the large pressure receiving surface side with respect to the eccentric shaft. Or the ventilation valve of 3.
The vent valve according to claim 2 or 3, wherein a weight portion is provided on the rotating shaft, and the weight of the valve body on the small pressure receiving surface side is made heavier than that on the large pressure receiving surface side.
The ventilation valve according to claim 5, wherein the ventilation function can be adjusted by appropriately setting a weight amount and a position of the weight portion.
The valve seat surface mounted on the inner peripheral surface of the cylinder main body is a tapered surface having a reduced diameter or a rounded curved surface, and the valve seat contact surface of the disc-shaped valve body is a spherical surface so that the valve seat surface and the The ventilation valve according to any one of claims 1 to 6, wherein the ventilation valve is provided so as to be in contact with the disc-like valve body by contact with a line.
A drain pipe insertion port for connecting an external drain pipe is provided in the cylinder body, and the drain pipe insertion port is formed to be transparent or semi-transparent so that the adhesive state with the external drain pipe is visible. The ventilation valve according to any one of 1 to 7.
The ventilation valve according to claim 1, wherein the rotation shaft is provided in a position near the inner periphery of the cylinder body, and the disk-like valve body is provided to be openable and closable via an arm member provided on the rotation shaft. valve.
10. The ventilation valve according to claim 9, wherein a stopper seal ring for closing the disc-like valve body is provided in the cylinder body.
The ventilation valve body has a rotation moment that rotates in the valve opening direction and a rotation moment that rotates in the valve closing direction, and the rotation valve body can perform the ventilation valve function. valve.
The vent valve according to claim 11, wherein the rotary valve body is given a rotational moment in a valve opening / closing direction via a fulcrum in a cylinder main body.
The ventilation valve according to claim 11 or 12, wherein the rotary valve body that is opened by its own weight is maintained in a valve-closed state by balancing with a weight portion.
The vent valve according to claim 11, wherein the fulcrum is an eccentric shaft having a double eccentric structure eccentrically doubled.
Claims wherein the maximum angle of the rotary valve body when the valve is open is regulated by a valve opening regulating portion that is a position where the rotary valve body can return to the valve closed state in equilibrium with the weight portion when the negative pressure is eliminated. Item 15. The ventilation valve according to any one of Items 11 to 14.
The vent valve according to any one of claims 11 to 15, wherein a valve body spherical surface which is a part of a spherical surface of the rotary valve body is in a tangential contact state with a conical taper surface mounted in the cylinder main body.
The vent valve according to any one of claims 11 to 16, wherein the rotary valve body is a disc-shaped valve body.
A vent valve for a vent valve has a rotation moment that rotates in a valve opening direction and a rotation moment that rotates in a valve closing direction, and is a ventilation valve that opens and closes a flow path by the rotary valve body, A vent valve characterized in that the chattering phenomenon between the rotary valve body and the valve seat is suppressed by setting the peak of the valve closing force between the valve opening fully closed and the valve opening fully open.
The vent valve according to claim 18, wherein the valve closing force peak of the rotary valve body is set between 5% and 50%.
The vent valve according to claim 18 or 19, wherein the rotary valve body has a double eccentric structure in which a rotation center is double eccentric.
The vent valve according to claim 20, wherein an eccentricity of the valve body support portion that supports the rotary valve body with respect to the rotary valve body is approximately 40% or more.
The rotary valve body is disposed at a position where the valve body is opened by its own weight, and is in a valve-closed state by balance with a weight portion provided on the disk body. Vent valve.
A drainage pipe system, wherein the vent valve according to any one of claims 1 to 22 is attached to an extended top vent pipe or a lower portion of an overflow edge.