JP2004353445A - Aerator for drainage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform installation operation by reducing the size of a device as well as securely eliminating a trouble with a drain pipe, easily perform inspections and repair, and immediately cope with an installation space. <P>SOLUTION: In this aerator for drainage, a check valve 14 in a normally closed state is allowed to communicate with an adjacent position in a drain pipe 3 in the form of a vertical pipe or a lateral pipe. An aeration valve 22 is continuously connected to the check valve 14, and the primary side space of the check valve 14 is formed in the valve chamber 16 of the aeration valve 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage ventilation device that is attached to a predetermined position of a drainage portion of a kitchen sink, a basin, a bathtub, a toilet, or the like provided in a building such as a house and ventilates a drainage pipe.

  In this type of drainage section, there is a possibility that various troubles such as a difficulty in drainage, odor, or noise due to drainage may occur due to poor ventilation at the time of drainage. Therefore, conventionally, means for solving these problems have been proposed.

  For example, Japanese Unexamined Patent Publication No. 9-126333 (Patent Document 1) discloses that a connecting pipe is connected in the middle of a drain pipe, and a branch pipe having a predetermined length is provided in the connecting pipe in an obliquely outward state. And a vent pipe having a vent valve and a check valve.

  Japanese Patent Laying-Open No. 2001-132863 (Patent Literature 2) is a drainage vent valve provided in communication with a vertical drainage pipe, and a valve element disposed at a position offset from the drainage pipe.

Japanese Patent Application Laid-Open No. 6-346496 (Patent Document 3) discloses a valve provided with a vent hole for communicating the atmosphere to a main pipe on the downstream side of a drain trap, and opening the vent hole when the internal pressure becomes negative. It is a device provided with.
In addition, Japanese Patent Publication No. 1-35235 (Patent Literature 4) discloses an arrangement in which an air inlet is provided in a valve chamber, and a connecting valve formed of a ring-shaped movable valve body for opening and closing the inlet is provided in the middle of the pipeline.
JP-A-9-126333 JP 2001-132863 A JP-A-6-346496 Japanese Patent Publication No. 1-335235

However, the above-described vent valve devices conventionally proposed have the following problems.
First, the apparatus disclosed in Japanese Patent Application Laid-Open No. 9-126333 requires a branch pipe branched from a drain pipe and an installation space occupied by a ventilation valve attached to the branch pipe. In particular, when the ventilation valve is disposed above the uppermost part of the drain trap, the length of the branch pipe or the like becomes long, and the space occupied by the device becomes very large. Therefore, for example, when this type of device is installed in a cabinet of a toilet fixture, the internal space is occupied excessively and becomes narrow, which hinders the use space in the cabinet. In addition, since it is necessary to assemble the device in a narrow space, the construction is troublesome. Further, this type of self-weighting vent valve has a problem that if the vent valve is tilted even slightly, the valve function may be impaired and odor may be leaked out. I have to work.

  On the other hand, a drain valve for drainage disclosed in Japanese Patent Application Laid-Open No. 2001-132863 is intended to be miniaturized so as to fit in a wall space of a building. Is newly raised upward from the drainage vertical pipe and is connected to the upper end of this pipe, and cannot be provided adjacent to the drainage pipe.

  Further, the devices disclosed in JP-A-6-346496 and JP-B-1-35235 can effectively utilize the outer peripheral space of a drain pipe, but when installed in the drain pipe, foreign matter is generated by a valve mechanism. When the water is clogged, or when the wastewater flows backward, the wastewater flows out of the vent hole.

  The present invention has been developed in view of the problems shown in the conventional example. The purpose of the present invention is not only to surely eliminate the trouble in the drain pipe, but also to reduce the size of the apparatus and to mount the apparatus. An object of the present invention is to make it possible to easily perform construction, to easily perform inspection and repair, etc., and to be able to immediately respond to an installation space.

  In order to achieve the above object, an invention according to claim 1 is to provide a check valve which is always closed at an intermediate position of a drain pipe which is a vertical pipe or a horizontal pipe, and ventilates the check valve. This is a drainage ventilating device configured by connecting valves.

  The invention according to claim 2 is characterized in that a connecting body provided in the middle of a drain pipe that is a vertical pipe or a horizontal pipe, a body provided integrally with or separately from the connecting body and communicating with the connecting body; And a vent valve for venting the negative pressure in the drain pipe on the primary side of the check valve.

  According to a third aspect of the present invention, a check valve is connected to an adjacent position in the middle of a drain pipe that is a vertical pipe or a horizontal pipe, and a vent valve is provided in connection with the check valve. This is a drainage venting device having a primary space as a valve chamber of the venting valve.

  The invention according to claim 4 is a drainage venting device provided with a vent valve at an adjacent position crossing the check valve in the axial direction.

  The invention according to claim 5 is a drainage ventilation device in which a lid-shaped dome body is rotatably provided on a primary side of the check valve, and a valve chamber of the ventilation valve is disposed in the dome body. .

  The invention according to claim 6 has a structure in which the check valve is always closed by a valve body urged by a spring, and the valve body is opened when the secondary side of the check valve becomes a negative pressure. There is a drainage venting device.

  The invention according to claim 7 is a drainage ventilation device in which the spring is disposed in a primary space of a check valve.

  The invention according to claim 8 is a drainage ventilation device in which the check valve and the drainage pipe are connected by a communication part having a substantially rectangular cross section.

  The invention according to claim 9 is that, by arranging the valve seat position of the normally closed check valve above the upper surface of the inner diameter of the communication portion adjacent to the check valve, drainage from the downstream side of the drain pipe is performed. This is a drainage venting device that can form an air layer on the drain pipe side of the check valve when flowing backward.

  The invention according to claim 10 is a drainage venting device in which a valve stem guide for guiding a valve stem of a vent valve is formed to protrude outside a base body for providing a check valve and a vent valve.

  The invention according to claim 11 is that a check valve in a normally closed state is communicated with an adjacent position in the middle of a drain pipe that is a vertical pipe or a horizontal pipe, and the check valve is configured to flow backward from a downstream side of the drain pipe. This is a drainage ventilation device having both the function of preventing the drainage and the function of a ventilation valve for releasing the negative pressure state of the drainage pipe.

  A twelfth aspect of the present invention is the drainage venting device, wherein the check valve is biased by a spring to close the valve body.

  The invention according to claim 13 is a drainage ventilation device in which the spring is disposed in a primary space of a check valve.

  As is clear from the above, according to the first aspect of the present invention, it is possible to surely eliminate the trouble in the drain pipe, and to bring the check valve mechanism and the ventilation valve mechanism close to the drain pipe. Therefore, it is a drainage ventilator that can be installed compactly, can be easily installed and installed, can be easily inspected and repaired, and can be installed in a narrow installation space.

  According to the second aspect of the present invention, the check valve mechanism and the ventilation valve mechanism can be integrated to reduce the size, and since they are configured as independent units, they can be mounted by simple operations.

  According to the third aspect of the present invention, the ventilation device effectively utilizes the space in the device, and the ventilation device can effectively perform ventilation.

  According to the fourth aspect of the invention, the axes of the check valve and the ventilation valve are maintained in parallel, so that there is no concern about inclination of the valve and the like, and stable valve performance can be maintained.

  According to the invention according to claim 5, by rotating the dome body, the orientation of the dome body can be adjusted according to the mounting condition, and at the time of installation work to the drain pipe, the dome body is rotated to a position where it is easy to tighten the joint nut. It can be moved, and after installation work, it can be stored close and compact.

  According to the invention according to claim 6, it is possible to sufficiently maintain the durability of the check valve. In addition, since the check valve is normally closed, the check valve itself can be located near the connector provided in the drain pipe, thereby eliminating the problem of responsiveness to the backflow and contributing to downsizing. it can.

  According to the seventh aspect of the present invention, the entire device can be made compact by effectively using the space in the device.

  According to the eighth aspect of the present invention, it is possible to provide a sufficient air permeability while making the overall size of the device compact by shortening the inter-surface dimension of the ventilation portion than the communication portion having a circular cross section.

  According to the ninth aspect of the present invention, since an air layer is formed on the drain pipe side of the check valve, the drainage does not come into contact with the valve seat of the check valve. In addition, it is possible to ensure the valve seat sealing property.

  According to the tenth aspect of the present invention, the height of the dome body can be secured by the opening and closing stroke of the ventilation valve body without considering the length of the valve shaft guide of the ventilation valve. It is possible to make the ventilation device compact while increasing the opening / closing stroke and securing the ventilation amount.

  According to the eleventh aspect of the present invention, the reliability is greatly improved by combining the check valve whose main role is to prevent liquid backflow and the vent valve whose role is to prevent odor discharge.

  According to the twelfth aspect of the present invention, it is possible to sufficiently endure use for a long period of time, and according to the thirteenth aspect of the present invention, the check valve can be made more compact. To play.

An example of the drainage ventilation device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional explanatory view showing an example in which a drainage ventilation device is provided in a drainage pipe of a wash basin. In FIG. 1, reference numeral 1 denotes a drainage ventilation device. In the middle of the drain pipes 3, 3, which are pipes, the drain pipes 3 and 3 are disposed at a position near the downstream side of the trap portion 4 or at a lower portion 2 a of a drain port of the wash basin 2.

  In FIG. 2, a rectangular projecting opening 5c is formed on the side of a resin connection body 5 such as ABS having screw connection portions 5a and 5b at the upper and lower ends, and a rectangular projecting opening is formed at the tip of the projecting opening 5c. A piece 5d is formed. In order to connect the drain pipes 3 to the connecting portions 5a and 5b of the connecting body 5, the ends of the drain pipes 3 and 3 are connected by the joint nut 6 via the packing 6a.

  Also, a resin body 7 such as ABS having a rectangular fitting portion 7a for fitting to the projecting piece 5d of the connecting body 5 is formed, and the fitting portion 7a is fitted to the projecting piece 5d. The body 7 is removably fitted to the connecting body 5 by the communication part 1a having a substantially rectangular cross section so as to connect the check valve 14 and the drain pipe 3 to each other. 14 is provided in the body 7. In this example, the connecting body 5 and the body 7 are provided separately, but the connecting body and the body may be provided integrally and communicated with each other.

The rectangular ceiling surface and the bottom surface of the communication portion 1a are round surfaces each including R ₁ and R ₂ , and in particular, by setting the radius R ₁ of the ceiling surface to be greater than the radius R _{2 of the} bottom surface, Drainage is prevented from accumulating at the corners between the surface and the side surface, and fitting errors between the ceiling surface and the bottom surface at the time of joining the connector 5 and the body 7 are prevented. Further, the bottom surface has a gentle downward slope from the check valve side to the drain pipe side, so that the drainage in the communication portion 1a is smoothly discharged.

  As shown in FIG. 4, the body 7 and the connecting body 5 are shaped so as to present an oval shape in the horizontal direction when they are joined, and the sectional shape is set to be small in the height direction and wide in the width direction. Since it has a rectangular shape, the size of the cross-sectional area of the communication portion 1a can be increased, and the shape of the communication portion 1a can be sufficiently secured while reducing the height of each component. It is possible to reduce the dimension between the surfaces of the ventilation portion (stand size) to make the ventilation portion compact.

  In FIG. 2, the body 7 has a cylindrical shape, and has openings 7b and 7c at upper and lower portions. In the upper opening 7b, a fitting tubular portion 9 provided on one side of a lower portion of a resin base body 8 such as ABS, which is a common component of the check valve portion and the ventilation valve portion, is provided via a sealing member 13. It is fitted. At the upper part of the fitting cylindrical portion 9, a flow passage portion 10 formed with a slightly reduced diameter is provided, and the communication portion 1a side (secondary side) of the flow passage portion 10 is formed by protruding to form a resin for a check valve. In addition to the annular valve seat 10a, a through portion 10c that guides the valve shaft 15 of the check valve via a rib 10b is provided at the center of the flow path portion 10.

  At the lower end of the valve shaft 15, a disc (valve body) 12 as a check valve is supported and brought into close contact with the valve seat 10a in parallel, so that a resin disc-shaped support portion such as ABS for ensuring valve seat sealing is provided. 15a is provided integrally, and a disc-like disc 12 made of rubber such as EPDM is placed on the upper surface of the support portion 15a. Further, on the upper surface of the disc 12, a disc-shaped support 15 b made of resin such as ABS is placed for reinforcing the disc 12.

  A locking member 15c such as a toothed retaining ring is fixed to the upper end of the valve shaft 15, and a spring 11 is resiliently provided between the locking member 15c and the concave portion 10d of the through portion 10c serving as a guide for the valve shaft. By arranging in this state, the disc 12 supported by the disc-shaped support portion 15a is urged in the primary direction with respect to the valve seat 10a, and the check valve 14 is always kept in a closed state.

The spring 11 is made of a metal such as stainless steel, and when the inside of the drain pipe 3, that is, the secondary side of the check valve 14 becomes a negative pressure, the disc 12 of the check valve 14 is quickly opened to open the valve. It has elastic force. The spring 11 is disposed in the valve chamber 16 which is the primary side of the check valve 14, and is disposed on the primary side of the check valve 14 as in the present embodiment. There is no danger that foreign matter contained in the drainage is entangled with the spring 11, and the deterioration of the spring 11 due to corrosion or the like due to drainage can be suppressed, and the durability of the check valve 14 is sufficiently ensured. Can be.
Furthermore, when the check valve 14 is fully opened, the spring 11 is housed in the recess 10d of the penetrating portion 10c.

Since the position of the disc 12 in the fully opened state of the check valve 14 is lowered near the upper surface of the cap 27 described later, that is, near the height of the bottom surface of the communication portion 1a, the operation stroke of fully opening and closing the disc 12 fully is described. It is possible to ensure a sufficient ventilation while shortening the distance.
As described above, the check valve 14 is provided in a state parallel to the drain pipe 3 and communicates with an adjacent position on a separate shaft, and the check valve 14 is fitted in the fitting cylinder 9 fitted in the body 7. The valve chamber 16 is constituted.

  The valve seat position of the check valve 14, which is always closed, is disposed above the inner diameter upper surface (ceiling surface) of the communication portion 1 a adjacent to the check valve 14, so that the drainage from the downstream side of the drain pipe 3 is performed. Is provided on the drain pipe 3 side (secondary side) of the check valve 14 so that an air layer S can be formed. Since the air layer S is formed, the drainage does not come into contact with the valve seat of the check valve 14, so that the valve seat sealing property can be reliably ensured without foreign substances being caught in the valve seat.

  In addition, the vent valve 22 forms an annular inlet 17 through which air flows into the other side of the lower portion of the base body 8, and an annular valve protruding from the inlet 17 to the check valve 14 side of the inlet 17 by its own weight. A rubber disk-like disc 19 made of EPDM or the like abutting on the seat 18, and a resin valve shaft 21 made of a resin such as ABS having a portion in the center of the disc 19 for holding the disc 19 in close contact with the sealing state. And a through portion 20 serving as a valve shaft guide for guiding the valve shaft 21 is provided at the center of the inflow port 17 and on the base body 8 via the rib 17a. Since the valve shaft guide 20 of the ventilation valve 22 is formed so as to protrude outside the base body 8 for providing the check valve 14 and the ventilation valve 22, the disc 19 and the valve shaft 21 are integrated as in this embodiment. In the case of the valve body structure formed as described above, the height of the dome body 23 described later may be secured by the opening and closing stroke of the ventilation valve body without considering the length of the valve shaft guide of the ventilation valve. The ventilation device can be made compact while increasing the opening / closing stroke of the ventilation valve valve body to secure the ventilation volume.

Further, a lid-shaped dome body 23 is detachably fitted to the outer peripheral edge of the base body 8 through a sealing member 23a made of rubber or the like, and an adjacent position crossing the check valve 14 in the axial direction, that is, The vent valve 22 is connected to the check valve 14 in a state parallel to the axial direction of the check valve 14 and at an adjacent position on a different axis. The room is 25. As described above, the primary side of the check valve 14 is provided with the ventilation valve 22 that vents against the negative pressure in the drain pipe 3.
Since the spring 11 is arranged in the primary space 24 of the check valve 14, the space in the dome 23 can be effectively used, and the whole apparatus is made compact.

The lower end 9a of the fitting cylinder 9 provided on one side of the lower part of the base body 8 is located near the opening 7c of the body 7, and is provided at the lower end 9a. The external thread portion 27a of the resin cylindrical cap 27 is screwed. The base body 8 and the body 7 are sealed by the seal member 13, and the cap 27 and the body 7 are sealed by the seal member 26. Therefore, the base body 8 and the cap 27 are integrally inserted into the body 7 via the two seal members 13 and 26 in a rotatable manner. That is, the ventilation valve 22 can rotate around the check valve 14 provided coaxially above the fitting cylinder 9 via the dome 23. A lower portion of the cap 27 has a large-diameter portion 27a having substantially the same diameter as the outer diameter of the body 7, and vertically restricts the fitting tubular portion 9 together with the base body 8.
As shown in FIG. 6, the dome 23 provided on the primary side of the check valve 14 is rotatably provided with respect to the body 7. The dome body 23, that is, the ventilation valve 22 can be rotated at a reasonable position, and the space can be used effectively by taking advantage of the lateral compactness of the device 1.
At this time, the dome body 23 is attached to the body 7 so that the inflow port 17 of the ventilation valve 22 is covered with the body 7 (the fitting portion 7a) as shown in FIG. A ridge 8a provided on the base body 8 on the dome body 23 side abuts the provided stopper 7d to regulate the rotation angle.
As shown in FIG. 5, a grid-like lattice portion 9c is provided at an intermediate position of the cylindrical portion 9a corresponding to the cross section of the fitting portion 7a, and rotates the dome body 23, that is, the cylindrical portion 9a. Even if it does not hinder ventilation.

  Further, in the above embodiment, the cross section of the projecting opening 5c, the flow path 10, the dome 23 and the opening area of the inflow port 17 are made substantially constant to secure the ventilation volume. The body 7, the connecting body 5 and the dome body 23 are formed in a flat rectangular shape having a reduced height direction and a rectangular cross section and a lengthwise length in the depth direction while securing the ventilation amount. Are superimposed and arranged in parallel with each other, so that the height of the device 1 is also compact.

  Since the valve chamber and the like can be detached from the connector by removing the cap 27 and the dome 23 at the lower part of the body 7, maintenance work such as inspection and cleaning can be easily performed.

Next, the operation of the above embodiment will be described.
In FIG. 2, when the pressure in the drain pipe 3 is equal to the atmospheric pressure, the disc 19 of the ventilation valve 22 is seated on the valve seat 18 of the inlet 17 by its own weight, and the disc 19 closes the air inlet 17. It is in the state that it was.
Also, in the check valve 14, the disc 12 is seated on the valve seat 10a of the flow passage 10 by the spring 11, and the flow passage 10 is closed by the disc 12.

Next, as shown in FIG. 1, when water is drained after using the wash basin 2, when the pressure in the drain pipe 3 becomes a negative pressure, the valve chamber of the check valve 14 communicating with the drain pipe 3. The internal pressure of the check valve 16 becomes lower than the atmospheric pressure, and the disc 12 of the check valve 14 moves away from the valve seat 10a against the resilience of the spring 11 in response to the negative pressure. Since the primary space 24 and the valve chamber 25 of the ventilation valve 22 are surrounded by the dome 23, the disk 19 of the ventilation valve 22 is lifted by the atmospheric pressure in accordance with the negative pressure state in the dome 23. Since the inflow port 17 is opened and air is taken into the drain pipe 3, the loss of water sealed in the trap section 4 provided in the wash basin is reduced so that breakage does not occur.
On the other hand, when the pressure in the pipe becomes a positive pressure, the disc 12 of the check valve 14 is seated, and the disc 19 of the ventilation valve 22 is also seated to close the inflow port 17 to remove the odor in the drain pipe 3 to the outside. To prevent spills.

  In addition, even if the vent valve 22 is damaged, the check valve 14 exhibits the vent valve function together with the check function, so that the odor in the drain pipe 3 may leak out to the outside. Instead, it has a double safety function.

  At the time of normal drainage, the check valve 14 is normally closed even if the splash of the drainage scatters to the valve chamber 16 side of the check valve 14 through the communication portion 1a. No water droplets of the drainage enter the primary space of 14.

  In addition, even if the drainage flows backward and enters the valve chamber 16 side of the check valve 14 through the communication portion 1a, the check valve 14 is normally closed by the spring 11 and thus is seen in the related art. The dome body 23 does not require a long response time for closing the valve body of the check valve as in the case of a drainage vent valve using a float type check valve body that utilizes backflow drainage, and does not require a large device, and is a barrel of the dome 23. The inflow of drainage into the primary space of the check valve 14 and the vent valve 22 can be prevented with a compact structure.

In this way, by setting the check valve 14 to the normally closed state, it is possible to reliably prevent the drainage from flowing out of the vent of the ventilation device.
Further, since there is no need to dispose the ventilation valve above the trap of the drainage device, a compact structure can be achieved while the entire ventilation device is disposed adjacent to the drainage pipe.

Next, another example of the drainage ventilation device according to the present invention will be described with reference to FIG.
The same reference numerals are used for the same parts in this example and the above-described apparatus, and the description thereof will be omitted.
In FIG. 9, the main body 26a of the ventilation valve 26 is screwed to a mounting portion 14a provided in the upper axial direction of the check valve 14.
The ventilation valve 26 has a structure in which a valve body 28 which always closes the ventilation portion 27 is provided, and the air is raised by an internal negative pressure to take in air.

Next, still another embodiment of the drainage ventilation device according to the present invention will be described with reference to FIG.
The same parts of the apparatus in this example and the apparatus in the above example are denoted by the same reference numerals, and the description thereof will be omitted.
In this example, a check valve 14 in a normally closed check state is connected to an adjacent position in the middle of the drain pipe 3, and the check valve 14 has a function of preventing a back flow from the downstream side of the drain pipe 3. This is a drainage ventilation state that also serves as a ventilation valve function for releasing the negative pressure state of the drain pipe 3.
The check valve 14 has a structure in which a valve body (disc) 12 is closed by being urged to the primary side by a spring 11, and a lid 30 having an opening 29 is provided on the primary side of the check valve 14. Provided.

In this example, the vent valve 22 is omitted without being provided, and the check valve 14 is used to perform the vent valve function. Therefore, the entire apparatus is further compacted and the structure is simplified.
In addition, the operation and effect of this embodiment are substantially the same as those of the above embodiment.

FIG. 11 is a sectional view showing still another embodiment of the drainage ventilation device according to the present invention.
The same parts of the apparatus in this example and the apparatus in the above example are denoted by the same reference numerals, and the description thereof will be omitted.
In this example, an opening 3b is formed in the upper part of the horizontal pipe 3a, a mounting member 31 communicating with the opening 3b is provided, and the connecting body 32 of the drainage ventilating device 1 is mounted on the mounting member 31. . An opening 3b may be formed in a direction intersecting horizontally with the horizontal pipe 3a, and the drainage ventilation device 1 may be connected to the opening 3b.
The above example is a difference between the vertical pipe 3 and the horizontal pipe 3a, and the operation and effect are substantially the same as the above example.

  Although the above example describes a wash basin, the present invention can be widely used for a drainage system such as a drainage unit such as a sink or a bathtub in a kitchen, a drainage pipe including a drainage trap or the like for a toilet bowl, or a drainage stack pipe.

It is sectional explanatory drawing which shows the example which provided the ventilation apparatus for drainage in this invention in the downstream drainage pipe of the drain trap of the washstand. It is an expanded sectional view of the ventilation apparatus for drainage shown in FIG. It is an exploded perspective view of the ventilation device for drainage. FIG. 3 is a perspective view of the device shown in FIG. 2. FIG. 3 is a sectional view taken along line B-B in FIG. 2. FIG. 5 is a plan view showing a rotating state of a movable body of the device shown in FIG. 4. (A) and (b) are plan views showing a rotating state of a movable body of the apparatus. FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2. It is sectional drawing which showed the other example of the ventilation apparatus for drainage in this invention. It is sectional drawing which showed the other example of the ventilation apparatus for drainage in this invention. It is sectional drawing which showed the other example of the ventilation apparatus for drainage in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Device 1a Communication part 3 Drain pipe 5 Connector 7 Body 8 Base body 12 Disk 14 Check valve 16 Valve room 19 Disk 20 Penetration part (valve shaft guide)
22 Vent valve

Claims (13)

  A drainage venting device characterized in that a check valve which is always closed is connected to an adjacent position in the middle of a drainage pipe which is a vertical pipe or a horizontal pipe, and a vent valve is connected to the check valve. .   A connecting body provided in the middle of a drain pipe that is a vertical pipe or a horizontal pipe, a body provided integrally with or separately from the connecting body to communicate with the connecting body, and a check valve provided in the body, A vent valve for venting the negative pressure in the drain pipe on the primary side of the check valve.   A check valve is connected to an adjacent position in the middle of a drain pipe which is a vertical pipe or a horizontal pipe, and a vent valve is provided in connection with the check valve, and a primary space of the check valve is connected to the vent valve. A ventilating device for drainage, characterized by a valve chamber.   The drainage ventilation device according to any one of claims 1 to 3, wherein a ventilation valve is provided at an adjacent position crossing the check valve in the axial direction.   The drain according to any one of claims 1 to 4, wherein a lid-shaped dome body is rotatably provided on a primary side of the check valve, and a valve chamber of the ventilation valve is provided in the dome body. For ventilation equipment.   The check valve according to any one of claims 1 to 5, wherein the check valve is normally closed by a valve body biased by a spring, and the valve body is opened when a negative pressure is applied to a secondary side of the check valve. The ventilating device for drainage according to claim 1.   The drainage ventilation device according to claim 6, wherein the spring is disposed in a primary space of a check valve.   The drainage ventilation device according to any one of claims 1 to 6, wherein the check valve and the drainage pipe are connected by a communication part having a substantially rectangular cross section.   By arranging the valve seat position of the check valve in the normally closed state above the upper surface of the inner diameter of the communication portion adjacent to the check valve, the check valve is closed when drainage flows from the downstream side of the drain pipe. The drainage ventilation device according to any one of claims 1 to 8, wherein an air layer can be formed on the drain pipe side.   The drainage ventilation device according to any one of claims 1 to 9, wherein a valve shaft guide for guiding a valve shaft of the ventilation valve is formed so as to protrude outside a base body for providing the check valve and the ventilation valve.   A check valve in a normally closed state is connected to an adjacent position in the middle of a drain pipe that is a vertical pipe or a horizontal pipe. A drainage ventilator, which also has a vent valve function for releasing a negative pressure state.   The drainage ventilation device according to claim 11, wherein the check valve has a structure in which a valve body is closed by being urged by a spring. The drainage ventilation device according to claim 11, wherein the spring is disposed in a primary space of a check valve.

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