JP2003064745A - Venting device for drainage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To not only surely solve trouble in a distributing pipe but also compact a device and simply conduct mounting execution while also enabling inspection, repair or the like easily and to instantaneously correspond to an installation space. SOLUTION: A venting device for drainage is constituted so that a check valve 14 under a closed state at all times is communicated with an adjacent place to the intermediate section of a drain pipe 3 as a vertical piping or a horizontal piping and a vent valve 22 is contacted continuously with the check valve 14. In the venting device for drainage, the primary-side space of the check valve 14 is used as a valve chamber 16 for the vent valve 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage for attaching to a predetermined position of a drainage part such as a sink, a washbasin, a bathtub, a toilet bowl, etc. of a kitchen provided in a building such as a house and for venting air into a drainage pipe. Ventilation device.

[0002]

2. Description of the Related Art In this type of drainage section, drainage becomes difficult to flow due to poor ventilation during drainage, odor is generated,
Alternatively, various troubles such as noise caused by drainage may occur. Therefore, conventionally, means for solving these problems have been proposed.

For example, Japanese Unexamined Patent Application Publication No. 9-126333 discloses that a connecting pipe is connected in the middle of a drainage pipe, and a branch pipe having a predetermined length is provided in an obliquely outward direction, and the branch pipe is ventilated. The device is provided with a vent pipe having a valve and a check valve.

Further, Japanese Unexamined Patent Publication No. 2001-132863 is a drainage ventilation valve which is provided in communication with a drainage vertical pipe so that a valve element is arranged at a position offset from the drainage pipe.

Further, Japanese Patent Application Laid-Open No. 6-346496 discloses
This device is provided with a vent hole that communicates the atmosphere to the main pipe on the downstream side of the drain trap, and the vent hole is provided with a valve that opens when the internal pressure becomes negative. In addition, Japanese Patent Publication 1-3523
In Japanese Patent No. 5 publication, an air inlet is provided in a valve chamber, and a connecting valve made of a ring-shaped movable valve body for opening and closing the inlet is provided in the middle of a pipeline.

[0006]

However, the above-mentioned vent valve device proposed hitherto has the following problems. First, JP-A-9-126333.
The device disclosed in the publication requires a branch pipe branched from the drain pipe and an installation space occupied by a ventilation valve attached to the branch pipe. In particular, when the ventilation valve is arranged above the uppermost part of the drain trap, the branch pipe and the like become long and the space occupied by the device becomes very large. Therefore, for example, when this type of device is installed in the cabinet of the washbasin, the internal space is excessively occupied and narrowed, which hinders the utilization space in the cabinet. Further, since it is necessary to assemble the device section in a narrow space, its construction is troublesome.
Furthermore, in this type of self-weighted seat ventilation valve, if the ventilation valve is tilted even a little, the valve function may be impaired and odor leakage may occur.Therefore, it is necessary to mount the ventilation valve vertically, which is difficult. I have to work.

On the other hand, the drainage ventilation valve disclosed in Japanese Unexamined Patent Publication No. 2001-132863 is intended to be small so as to fit in the wall space of a building. Is a ventilation pipe newly raised from the drainage vertical pipe and connected to the upper end of this pipe, and cannot be provided adjacent to the drainage pipe.

Further, although the devices disclosed in JP-A-6-346496 and Japanese Patent Publication No. 1-35235 can effectively utilize the outer peripheral space of the drainage pipe, when the device is installed in the drainage pipe, foreign matter is not present. However, if the valve mechanism is clogged, or if the drainage flows back, the drainage flows out from the ventilation hole.

The present invention was developed in view of the problems shown in the prior art, and the purpose of the present invention is not only to surely eliminate the trouble in the drain pipe,
The aim is to make the device compact and to make it easy to install and install, and also to make inspections and repairs easy, so that the installation space can be immediately accommodated.

[0010]

In order to achieve the above object, the invention according to claim 1 provides a check valve which is always closed at an adjacent position in the middle of a drain pipe which is a vertical pipe or a horizontal pipe. This is a drainage ventilation device configured to communicate with each other and to connect the check valve with a ventilation valve.

According to a second aspect of the present invention, a connecting body is provided in the middle of a drain pipe which is a vertical pipe or a horizontal pipe, and a body which is provided integrally with or separately from the connecting pipe and communicates with the connecting body. The drainage ventilation device is provided with a check valve provided in the body and a ventilation valve for ventilating the negative pressure in the drainage pipe on the primary side of the check valve.

According to the third aspect of the invention, a check valve is made to communicate with 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 so as to be connected to the check valve. This is a drainage ventilation device in which the primary space of the stop valve is the valve chamber of the ventilation valve.

According to a fourth aspect of the present invention, there is provided a drainage ventilation device in which a ventilation valve is provided at an adjacent position crossing the check valve in the axial direction.

According to a fifth aspect of the present invention, a lid-shaped dome body is rotatably provided on the primary side of the check valve, and the valve chamber of the ventilation valve is disposed in the dome body for drainage ventilation. It is a device.

According to a sixth aspect of the present invention, the check valve is always closed by a valve element biased by a spring, and the valve element is opened when the secondary side of the check valve becomes negative pressure. It is a drainage ventilation device having a structure.

According to a seventh aspect of the present invention, there is provided a drainage ventilation device in which the spring is arranged in the primary space of the check valve.

According to an eighth aspect of the present invention, there is provided a drainage ventilation device in which the check valve and the drainage pipe are connected by a communication portion having a substantially rectangular cross section.

In the invention according to claim 9, the valve seat position of the check valve which is normally closed is arranged above the inner diameter upper surface of the communicating portion adjacent to the check valve, so that the downstream side of the drain pipe. This is a ventilation device for drainage that allows an air layer to be formed on the drain pipe side of the check valve when the drainage flows back from the drainage pipe.

According to a tenth aspect of the present invention, there is provided a drainage ventilation device in which a valve shaft guide for guiding the valve shaft of the ventilation valve is formed outside the base body for providing the check valve and the ventilation valve.

According to the eleventh aspect of the present invention, a normally closed check valve is made to communicate with an adjacent position in the middle of a drain pipe which is a vertical pipe or a horizontal pipe, and the check valve is located on the downstream side of the drain pipe. This is a drainage ventilation device that also has a function of preventing backflow from the drainage pipe and a ventilation valve function for releasing the negative pressure state of the drainage pipe.

According to a twelfth aspect of the present invention, the check valve is
A drainage ventilation device having a structure in which a valve element is closed by being biased by a spring.

According to a thirteenth aspect of the present invention, there is provided a drainage ventilation device in which the spring is arranged in the primary space of the check valve.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION An example of a ventilation device for drainage according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional explanatory view showing an example in which a drainage ventilation device is provided in a drainage pipe of a washbasin. In FIG. 1, 1 is a drainage ventilation device.
It is disposed in the vicinity of the downstream side of the trap portion 4 or at the drain port lower portion 2 a of the washbasin 2 in the middle of the drainage pipes 3, 3 which are vertical pipes or horizontal pipes of the washbasin 2.

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

Further, a body 7 made of resin such as ABS having a rectangular fitting portion 7a for fitting to the projecting piece 5d of the connector 5 is formed, and the fitting portion 7a is fitted to the projecting piece 5d. The connecting portions 1a are connected to each other so that the body 7 is detachably fitted to the connecting body 5 by the connecting portion 1a having a substantially rectangular cross section so that the check valve 14 and the drain pipe 3 are connected. A check valve 14 is provided inside the body 7. In addition, in this example, the connection body 5 and the body 7 are provided as separate bodies, but the connection body and the body may be provided integrally and communicate with each other.

The rectangular ceiling surface and the bottom surface of the communicating portion 1a are rounded surfaces composed of R ₁ and R ₂ , respectively, and in particular,
With rounded surface radius R _1> curved surface radius R ₂ of the bottom surface of the ceiling surface, with which prevents drainage from accumulating in the corner between the ceiling surface and the side surface, the connecting member 5, the body 7 It is designed to prevent fitting errors between the ceiling and bottom surfaces when joining. In addition, the bottom surface has a gentle downward slope from the check valve side toward 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 have an oval shape in the horizontal direction when joined, and have a cross-sectional shape with a small height direction and a width direction. Since the rectangular shape is set to be wide, the cross-sectional area of the communication portion 1a can be widened, and the height of each component can be reduced while the ventilation amount can be sufficiently secured. The face-to-face dimension (standing dimension) of the ventilation portion can be made shorter than that of the portion to make it compact.

In FIG. 2, the body 7 has a cylindrical shape, and openings 7b and 7c are provided in the upper and lower portions thereof. In the upper opening 7b, a fitting cylinder 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 a check valve portion and a ventilation valve portion, is provided with a seal member 13 interposed therebetween. Have been inserted. A flow path portion 10 having a slightly reduced diameter is provided on the upper portion of the fitting tubular portion 9, and the communication portion 1a side (secondary side) of the flow passage portion 10 is formed by protrusion to form a check valve resin. In addition to the annular valve seat 10a, a passage portion 10c that guides the valve shaft 15 of the check valve via a rib 10b is provided at the center of the flow passage portion 10.

At the lower end of the valve shaft 15, a disc (valve body) 12 of a check valve is supported so as to be in close contact with the valve seat 10a in parallel. -Shaped support portion 15a is integrally provided, and the disc-shaped disc 1 made of rubber such as EPDM is provided on the upper surface of the support portion 15a.
2 is placed. Further, on the upper surface of the disc 12, a disc-shaped support portion 15b made of resin such as ABS is placed to reinforce the disc 12.

A locking member 15c such as a toothed snap ring is fixed to the upper end of the valve shaft 15, and the spring 11 is provided between the locking member 15c and the recess 10d of the penetrating portion 10c serving as a guide for the valve shaft. The disk 12 supported by the disc-shaped support portion 15a is urged toward the primary side with respect to the valve seat 10a, and the check valve 14 is always closed. It

The spring 11 is made of metal such as stainless steel, and promptly opens the disc 12 of the check valve 14 to open the valve when the drain pipe 3 has a negative pressure on the secondary side of the check valve 14. It has a certain degree of elasticity. The spring 11 is arranged in the valve chamber 16 which is the primary side of the check valve 14. By arranging the spring 11 on the primary side of the check valve 14 as in this embodiment, the spring 11 comes into contact with drainage. There is no fear of foreign matter contained in the drainage being entangled in the spring 11, and deterioration of the spring 11 due to corrosion due to drainage can be suppressed, and the durability of the check valve 14 can be sufficiently secured. You can Further, the spring 11 is provided with a through portion 10 when the check valve 14 is fully opened.
Since it is housed in the concave portion 10d of c, the ventilation to the drainage pipe 3 is not hindered.

The disk 12 with the check valve 14 fully opened
Since the position of is set to a position near the upper surface of the cap 27, which will be described later, that is, near the height of the bottom surface of the communication portion 1a, the operating stroke distance for fully opening and fully closing the disk 12 is shortened, and a sufficient ventilation amount is achieved. Can be secured. As described above, the check valve 14 is provided in parallel with the drainage pipe 3 and communicates with the adjacent position by another shaft, and also the body 7
A valve chamber 16 of the check valve 14 is formed in the fitting tubular portion 9 fitted in the.

The valve seat position of the check valve 14 which is normally closed is arranged above the inner diameter upper surface (ceiling surface) of the communicating portion 1a adjacent to the check valve 14 so that the check valve 14 is located downstream of the drain pipe 3. Drainage pipe 3 of the check valve 14 when drainage flows back from the side
An air layer S is provided on the side (secondary side) so that it can be formed. By forming the air layer S, the drainage does not come into contact with the valve seat of the check valve 14, so that the foreign matter does not get caught in the valve seat, and the valve seat sealability can be reliably ensured.

Further, the ventilation valve 22 forms an annular inflow port 17 into the other side of the lower portion of the base body 8 for allowing the atmosphere to flow in, and the inflow port 17 is formed by its own weight so as to project toward the check valve 14 side of the inflow port 17. A disk-shaped disc 19 made of rubber such as EPDM that abuts against the annular valve seat 18, and a resin disc such as ABS having a portion at the center of the disc 19 for closely holding the disc 19 in a sealed state. A valve shaft 21 is provided, and a penetrating portion 20 serving as a valve shaft guide that guides the valve shaft 21 is provided in the base body 8 at the center of the inflow port 17 and via the rib 17a. Valve shaft guide 20 of this ventilation valve 22
Is a base body 8 for providing the check valve 14 and the ventilation valve 22.
Since it is formed so as to project outward, in the case of the valve body structure in which the disc 19 and the valve shaft 21 are integrally formed as in this embodiment, the height of the dome body 23 described later is set to the valve shaft of the ventilation valve. Since it suffices to secure only the opening / closing stroke of the ventilation valve body without considering the length of the guide, it is possible to make the ventilation device compact while ensuring the ventilation amount by increasing the opening / closing stroke of the ventilation valve body. It will be possible.

Further, a lid-shaped dome body 23 is detachably fitted to the outer peripheral edge of the base body 8 via a seal member 23a made of rubber or the like, and crosses the check valve 14 in the axial direction. The ventilation valve 22 is connected to an adjacent position, that is, parallel to the axial direction of the check valve 14 and to an adjacent position on another axis, and the dome body 23 forms the primary side space 2 of the check valve 14.
4 is a valve chamber 25 of the ventilation valve 22. In this manner, the check valve 14 is provided with the ventilation valve 22 on the primary side thereof to ventilate 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 body 23 can be effectively utilized, and the entire device is made compact.

The lower end portion 9a of the fitting cylindrical portion 9 provided on one side of the lower portion of the base body 8 is located in the vicinity of the opening portion 7c of the body 7. Since the lower end portion 9a is provided at the lower end portion 9a, the screw portion 9b is provided. ,
Male thread portion 27a of a cylindrical resin cap 27 such as ABS
Are screwed together. 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 integrated to form the two seal members 13,
It is rotatably inserted in the body 7 via 26. That is, the ventilation valve 22 can rotate around the check valve 14 coaxially provided on the upper portion of the fitting tubular portion 9 via the dome body 23. A large diameter portion 27a having a diameter substantially equal to the outer diameter of the body 7 is provided in the lower portion of the cap 27 to vertically restrain the fitting cylinder portion 9 together with the base body 8. As shown in FIG. 6, since the dome body 23 provided on the primary side of the check valve 14 is rotatably provided with respect to the body 7, the ventilation device 1 is placed close to the drain pipe 3 after the installation of the ventilation device 1 is completed. Can be stored
The dome body 23, that is, the ventilation valve 22 can be rotated to a rational position, and the space can be effectively used by utilizing the compactness of the device 1 in the lateral direction. At this time, the dome body 23 is installed in the body 7 so that the inflow port 17 of the ventilation valve 22 is not covered with the body 7 (fitting portion 7a) as shown in FIG. The ridge 8a provided on the base body 8 on the dome body 23 side contacts the provided stopper 7d to regulate the rotation angle. Further, as shown in FIG. 5, a lattice-shaped lattice portion 9c is provided at an intermediate position of the tubular portion 9a, which is a portion corresponding to the cross section of the fitting portion 7a, to rotate the dome body 23, that is, the tubular portion 9a. Even so, it does not hinder ventilation.

Further, in the above embodiment, the cross-sections of the projecting opening 5c, the flow path portion 10 and the dome body 23 and the opening areas of the inflow port 17 are made substantially constant to ensure a ventilation amount. In this manner, the body 7, the connecting body 5, and the dome body 23 are formed into a flat oval shape having a rectangular cross section in which the height direction is lowered and a longitudinal direction in the longitudinal direction, while ensuring the air flow amount.
Furthermore, by stacking the rotating parts of the dome body 23 and arranging them in parallel, the height of the device 1 is also compact.

Since the valve chamber and the like can be detached from the connection body by removing the cap 27, the dome body 23 and the like under 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 drainage pipe 3 is the same as the atmospheric pressure,
The disc 19 of the ventilation valve 22 has an inflow port 1 due to its own weight.
7 is seated on the valve seat 18, and the air inlet 17 is closed by the disc 19. Also, the check valve 14
Also, the disk 12 is seated on the valve seat 10a of the flow path portion 10 by the spring 11, and the disk 12 is seated by the disk 12.
0 is in the closed state.

Next, as shown in FIG. 1, when draining water after using the washbasin 2, if the pressure in the drainage pipe 3 becomes negative, the check valve 14 communicating with the inside of the drainage pipe 3 is used. Valve chamber 16
The internal pressure becomes a negative pressure rather than the atmospheric pressure, and in response to this negative pressure, the disc 12 of the check valve 14 separates from the valve seat 10a against the elastic force of the spring 11, and at the same time, the check valve 14 The primary side space 24 and the valve chamber 25 of the ventilation valve 22 include the dome body 2
Since it is surrounded by 3, the disc 19 of the ventilation valve 22 is lifted by the atmospheric pressure to open the inflow port 17 according to the negative pressure state in the dome body 23, and the air is taken into the drain pipe 3, so that the wash surface The loss of sealing water in the trap portion 4 provided in the device is reduced so as not to break the seal. On the other hand, when the pressure in the pipe becomes positive, the check valve 1
The disc 12 of No. 4 is seated, and the disc 19 of the ventilation valve 22 is also seated to close the inflow port 17 so that the odor in the drain pipe 3 does not flow out.

Even if the ventilation valve 22 is damaged, the check valve 14 exerts the check valve and the ventilation valve function, so that the odor in the drainage pipe 3 is leaked to the outside. There is no danger of this happening, and consideration is given to having a dual safety function.

At the time of normal drainage, the splash of drainage is connected to the communicating portion 1a.
Even if the check valve 14 is scattered to the valve chamber 16 side through the check valve 14, the check valve 14 is always closed. Therefore, water droplets of drainage enter the primary space of the check valve 14 that is the dome body 23. There is nothing to do.

Further, even if the drainage flows back and enters the valve chamber 16 side of the check valve 14 through the communication portion 1a, the check valve 14 is always closed by the spring 11, so that the conventional technique is used. The dome does not require a long response time for closing the valve body of the check valve, such as a ventilation valve for drainage using a check valve body of the float type that uses the backflow drainage seen in Fig. It is possible to prevent the inflow of the drainage into the primary space of the check valve 14, which is the body 23, and the ventilation valve 22 with a compact structure.

As described above, by always closing the check valve 14, it is possible to reliably prevent the drainage of the drainage from the ventilation port of the ventilation device. Further, since it is not necessary to dispose the ventilation valve above the trap of the drainage device, it is possible to provide a compact structure while disposing the entire ventilation device adjacent to the drain pipe.

Another example of the drainage ventilation device according to the present invention will be described with reference to FIG. The same parts as in this example and the above-mentioned device are designated by the same reference numerals, and the description thereof will be omitted. Figure 9
At the mounting portion 14 provided in the upper axial direction of the check valve 14,
A main body 26a of the ventilation valve 26 is screwed to a. The ventilation valve 26 is a valve body 28 that normally closes the ventilation portion 27.
Is provided, and the structure is such that it rises due to the negative pressure inside and intakes 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 device of this example and the device of 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 communicated with an adjacent position in the middle of the drain pipe 3, and the check valve 14 has a function of preventing backflow from the downstream side of the drain pipe 3. The drainage ventilation state is combined with a ventilation valve function for releasing the negative pressure state of the drainage pipe 3. The check valve 14 has a structure in which the valve body (disk) 12 is closed by urging the spring 11 toward the primary side.
A lid 30 having an opening 29 is provided on the primary side.

In this example, the ventilation valve 22 is omitted and omitted, and the check valve 14 performs the ventilation valve function. Therefore, the entire apparatus can be made more compact and the structure can be simplified. In addition, the function and effect of this example are substantially the same as those of the above example.

FIG. 11 is a sectional view showing still another form of the drainage ventilation device according to the present invention. The same parts of the device of this example and the device of 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 an upper portion of the horizontal pipe 3a, a mounting member 31 communicating with the opening 3b is provided, and the connection body 32 of the drainage ventilation device 1 is mounted on the mounting member 31. . You may make it form the opening part 3b in the direction which intersects horizontally with the horizontal piping 3a, and connect the drainage ventilation apparatus 1 to this opening part 3b. The above example is the difference between the vertical pipe 3 and the horizontal pipe 3a, and the operation effect is substantially the same as the above example.

In the above example, the wash basin has been described, but it can be widely used in drainage systems such as drainage parts of kitchen sinks and bathtubs, drainage pipes including drainage traps of toilet bowls, and drainage stacks. it can.

[0050]

As is apparent from the above, according to the invention of claim 1, it is possible to surely eliminate the trouble in the drain pipe, and also to connect the check valve mechanism and the ventilation valve mechanism to the drain pipe. The equipment can be made compact because it can be located in close proximity, and the installation work is easy, and inspections and repairs can be performed easily, and it can be installed in a narrow installation space. It is a ventilation device.

According to the second aspect of the present invention, the check valve mechanism and the vent valve mechanism can be integrated into a smaller unit, and since they are constructed as independent units, they can be mounted by a simple operation. it can.

According to the third aspect of the present invention, the ventilation device effectively utilizes the space in the device, and this ventilation device enables effective ventilation.

According to the fourth aspect of the present invention, the axes of the check valve and the vent valve are kept parallel to each other, so that there is no fear of tilting of the valve and stable valve performance can be maintained.

According to the invention of claim 5, by rotating the dome body, the dome body can be oriented in accordance with the mounting condition, and it is easy to tighten the joint nut when installing the drain pipe. Rotate to the position,
After the installation work is completed, it can be placed close and compactly stored.

According to the invention of claim 6, the durability of the check valve can be sufficiently maintained. Also, the check valve is
Since the valve is normally closed, the check valve itself can be located in the vicinity of the connection body provided in the drainage pipe, so that the problem of responsiveness to backflow can be solved, which contributes to downsizing.

According to the invention of claim 7, the space in the device can be effectively used and the entire device can be made compact.

According to the eighth aspect of the present invention, it is possible to make the entire apparatus compact and to have sufficient air permeability by making the dimension between the air-permeable portions shorter than that of the communicating portion having a circular cross section.

According to the ninth aspect of the present invention, since the air layer is formed on the drain pipe side of the check valve, the drainage does not come in contact with the valve seat of the check valve, so that foreign matter is caught in the valve seat. It is possible to reliably secure the valve seat sealability.

According to the tenth aspect of the invention, the height of the dome body need only be secured for the opening / 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 ventilator compact while increasing the opening / closing stroke of the valve element to secure the ventilation amount.

According to the eleventh aspect of the present invention, the reliability is significantly improved by combining the check valve having the main role of preventing the backflow of the liquid with the ventilation valve having the role of preventing the discharge of the odor.

According to the twelfth aspect of the present invention, it is possible to sufficiently withstand long-term use.
According to the invention of the above aspect, the check valve can be made compact, and other remarkable effects can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an example in which a drainage ventilation device according to the present invention is provided in a drainage pipe on a downstream side of a drainage trap of a washbasin.

FIG. 2 is an enlarged cross-sectional view of the drainage ventilation device shown in FIG.

FIG. 3 is an exploded perspective view of a drainage ventilation device.

FIG. 4 is a perspective view of the device shown in FIG.

5 is a sectional view taken along line BB of FIG.

6 is a plan view showing a rotating state of a movable body of the apparatus shown in FIG.

7 (a) and 7 (b) are plan views showing a rotating state of a movable body of the apparatus.

8 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 9 is a cross-sectional view showing another example of the ventilation device for drainage according to the present invention.

FIG. 10 is a sectional view showing still another example of the drainage ventilation device of the present invention.

FIG. 11 is a cross-sectional view showing still another example of the drainage ventilation device according to the present invention.

[Explanation of symbols]

1 device 1a Communication part 3 drainage pipes 5 connection 7 body 8 base body 12 disk 14 Check valve 16 valve chamber 19 Disco 20 Penetration part (valve shaft guide) 22 Ventilation valve

Continued front page    F-term (reference) 2D061 AA01 AA02 AA03 AB03 AB04                       AC08                 3H055 AA05 AA22 BA18 GG05 GG22                       GG27                 3H058 AA03 BB22 BB29 CA22 CD03                       EE04

Claims (13)

[Claims] 1. A check valve which is always closed is made to communicate with an adjacent position in the middle of a drain pipe which is a vertical pipe or a horizontal pipe, and a vent valve is connected to this check valve. Ventilation device for drainage. 2. A connection body provided in the middle of a drainage pipe which is a vertical pipe or a horizontal pipe, a body which is provided integrally with or separately from the connection body and communicates with the connection body, and a body which is provided in the body. A drainage ventilation device comprising a check valve and a ventilation valve for ventilating a negative pressure in a drain pipe on a primary side of the check valve. 3. 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 ventilation valve is provided in connection with the check valve, and a primary side space of the check valve. Is a valve chamber of the ventilation valve. 4. The drainage ventilation device according to claim 1, wherein a ventilation valve is provided at an adjacent position that intersects with the axial direction of the check valve. 5. A lid-shaped dome body is rotatably provided on the primary side of the check valve, and a valve chamber of the ventilation valve is arranged in the dome body. The ventilation device for drainage according to the item. 6. The check valve has a structure in which a valve element urged by a spring is always closed and the valve element is opened when the secondary side of the check valve becomes negative pressure. 1 to 5
The drainage ventilation device according to any one of 1. 7. The drainage ventilation device according to claim 6, wherein the spring is arranged in a primary space of the check valve. 8. The drainage ventilation device according to claim 1, wherein the check valve and the drainage pipe are connected by a communication portion having a substantially rectangular cross section. 9. When the drainage flows backward from the downstream side of the drain pipe, the valve seat position of the normally closed check valve is arranged above the inner diameter upper surface of the communicating portion adjacent to the check valve. The ventilation device for drainage according to any one of claims 1 to 8, wherein an air layer can be formed on the drain pipe side of the check valve. 10. The drainage ventilation according to claim 1, wherein a valve shaft guide for guiding the valve shaft of the ventilation valve is formed so as to protrude outside the base body for providing the check valve and the ventilation valve. apparatus. 11. A normally closed 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 the check valve has a function of preventing backflow from the downstream side of the drain pipe. And a ventilation device for drainage, which also serves as a ventilation valve function for releasing the negative pressure state of the drainage pipe. 12. The drainage ventilation device according to claim 11, wherein the check valve has a structure in which the valve body is closed by being urged by a spring. 13. The drainage ventilation device according to claim 11, wherein the spring is arranged in the primary space of the check valve.