JP6742162B2 - Pressure relief device and drainage system - Google Patents

Description

The present invention relates to a pressure relief device and a drainage system provided in a drainage pipe.

Conventionally, there is known a drainage system provided with an expansion/contraction chamber as a pressure relaxation device for releasing the pressure in the pipe (see, for example, Patent Document 1).

As a structure of this expansion/contraction chamber, a pressure relief device formed by fixing a flexible air reservoir to the housing is known.

JP, 2011-147878, A Special table 2005-501986 gazette

In the pressure relieving device constituted by such a bag body, when expanding from a deflated state, its own weight is added and the expansion resistance is large, and the pressure relieving effect is limited when a low pressure is applied.

It is an object of the present invention to provide a pressure relief device and a drainage system that can expand even at low pressure to release pressure.

The pressure relief device according to the first aspect of the present invention is a bag body including an opening for communicating with a drain pipe of a water supply device and receiving pressure from the drain pipe from the inside of a lower portion, and a top portion provided at an upper portion. And a shape maintaining unit for maintaining the bag body in a self-supporting state, and an expansion/contraction unit that forms a part of the bag body and expands/contracts in the lateral direction by receiving the pressure.

The bag body receiving the pressure from the drainage pipe from the inside is maintained in a self-supporting state by the shape maintaining portion, and a part of the bag body constitutes an expanding/contracting portion which receives the pressure and expands/contracts in the lateral direction. Therefore, when the expansion/contraction part expands in the lateral direction by receiving the pressure from the drainage pipe, the expansion resistance is reduced as compared with the bag body to which its own weight is applied during expansion.

Here, the self-supporting state means a state in which the bag body maintains its height. Further, the shape maintaining portion means a structure in which the bag body can maintain its height depending on its rigidity, structure, shape, wall thickness, material, or the like, or a member other than the bag body. When the bag is made of a flexible material such as rubber, a part of it is made thick to form the shape maintaining part.In addition, for example, a wire having rigidity such as a wire that maintains a self-supporting state is placed in the bag. Alternatively, the shape maintaining unit may be configured. Furthermore, when the bag is self-supporting in a state in which the peripheral surface of the bag body is tilted inward and leaning, the leaning portion serves as the shape maintaining portion.
The "lateral direction" in which the expansion/contraction part expands/contracts is a direction orthogonal to the self-supporting direction of the bag body maintained in the self-supporting state.

In the pressure relief device according to the second aspect of the present invention, in the first aspect, the shape maintaining section includes a lateral direction maintaining section that maintains a part of the bag body in a laterally extending state.

That is, a part of the bag body is previously maintained in the laterally extended state by the lateral direction maintaining portion, and by using the extended portion as a starting point, the bag body can be easily expanded in the lateral direction.

In the pressure relief device of the third aspect of the present invention, in the second aspect, the lateral direction maintaining portion is formed in a radial shape.

That is, since the lateral direction maintaining portion is formed in the radial shape, it becomes easier to expand in the lateral direction.

A pressure relief device according to a fourth aspect of the present invention is the pressure-relief device according to any one of the first to third aspects, wherein the shape maintaining portion is a vertical portion that maintains a state in which a portion of the bag body extends in the vertical direction. A direction maintaining unit is provided.

That is, since the bag body is maintained in a state in which a part of the bag body is preliminarily extended in the vertical direction by the vertical direction maintaining portion, it becomes easier to expand.

A drainage system according to a fifth aspect of the present invention is the drainage pipe for flowing the drainage from the water supply device downward, a horizontal pipe for horizontally flowing the drainage from the drain pipe, and the drainage from the horizontal pipe. And a vertical pipe that flows downward. The pressure relief device according to any one of the first to fourth aspects is connected to the drain pipe.

That is, the pressure generated during drainage is absorbed by the expansion of the bag body of the pressure relief device. Therefore, as compared with the case where the pressure remains in the pipe such as the horizontal pipe, it is possible to suppress the discharge of sealing water and the generation of odor when a plurality of devices are joined.

Since the present invention has the above-described configuration, it is possible to expand the pressure and release the pressure even at a low pressure.

It is an outline longitudinal section showing the drainage system concerning a 1st embodiment. (A) is a longitudinal cross-sectional view showing the pressure relief device according to the same embodiment, and (B) is a view corresponding to a cross-section taken along line AA of (A). It is a perspective view showing a joint concerning the embodiment. It is a perspective view showing a cover concerning the embodiment. It is a perspective view which shows the bag body which concerns on the same embodiment. It is a side view which shows the bag body which concerns on the same embodiment. It is a top view which shows the cover which concerns on other embodiment, (A) is a top view which shows 2nd Embodiment, (B) is a top view which shows 3rd Embodiment, (C) shows 4th Embodiment. A plan view, (D) is a plan view showing a fifth embodiment, (E) is a plan view showing a sixth embodiment, (F) is a plan view showing a seventh embodiment, and (G) is an eighth embodiment. Is a plan view showing a ninth embodiment, and (I) is a plan view showing a tenth embodiment. It is a perspective view which shows the bag body which concerns on 11th Embodiment. It is a side view which shows the pressure relaxation apparatus which concerns on 12th Embodiment. It is a perspective view showing a joint concerning the embodiment. It is a perspective view showing a cover concerning the embodiment. It is a perspective view which shows the bag body which concerns on the same embodiment. It is the figure which looked at the bag body concerning the embodiment from diagonally above. It is sectional drawing which shows the principal part of the pressure relief apparatus which concerns on the same embodiment.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the drainage system 10 according to the present embodiment includes a siphon drainage structure. It should be noted that the configuration of the connecting portion of each pipe is omitted in FIG. The drainage stack 16 that penetrates the through hole 14 of the floor slab 12 of the building is provided with a drainage joint 18 that connects the pipes from the drainage fixture, and the drainage from the drainage stack 16 at the top and the drainage fixture It is configured to join with the drainage from.

On each floor, there is a kitchen sink 19 as a water supply device and a dishwasher 20 (only part of which is shown). The kitchen sink 19 and the dishwasher 20 are provided with drainage ports 22 and 24, respectively, through which drainage flows. The drainage port 22 of the kitchen sink 19 communicates with a water-sealed drainage trap 26 for preventing backflow of dirty odors, gases, etc. The drainage trap 26 is a so-called bowl trap. The dishwasher 20 is provided with a backflow prevention valve that is an electromagnetic valve having a backflow prevention function, and is configured to prevent backflow of dirty odor, gas, and the like. The check valve of the dishwasher 20 may be replaced with a water seal trap.

A connection pipe 30 that communicates with the drain trap 26 is provided at the bottom of the drain trap 26 on the kitchen sink 19 side. The connection pipe 30 extends downward from the drain trap 26 and discharges the drain water from the drain trap 26 downward. A drain pipe 32 for flowing is connected. Further, a drain pipe 34 for flowing drainage below the drain pipe 32 is connected to the downstream side of the drain port 24 of the dishwasher 20.

The drain pipe 32 on the kitchen sink 19 side is provided with a ventilation valve 36 that allows air from the outside to pass to the drain pipe 32 and does not allow drainage and air to pass from the drain pipe 32 to the outside. A joint pipe 38 is provided in the drainage pipe 32 located below the ventilation valve 36, and a pressure relief device 40 is provided at an end of the joint pipe 38.

The drain pipe 32 located below the joint pipe 38 is provided with a merge pipe 42, and the drain pipe 32 on the kitchen sink 19 side and the drain pipe 34 on the dishwasher 20 side merge at the merge pipe 42. To do. A siphon drainage pipe 44 is connected downstream of the confluence pipe 42. The siphon drainage pipe 44 is a horizontal pipe 46 extending laterally along the floor slab 12, and a vertical pipe 48 provided downstream of the horizontal pipe 46 and extending downward along the drainage pipe 16. The vertical pipe 48 is connected to the drainage stack 16 via the drainage joint 18.

In the siphon drain pipe 44, the siphon force is generated by causing the drainage flowing from the horizontal pipe 46 into the vertical pipe 48 to flow downward. The drainage in the horizontal pulling pipe 46, the drainage pipe 32, and the confluence pipe 42 is pulled by the siphoning force generated in the vertical pipe 48, so that the siphoning force in the discharging direction acts.
That is, the horizontal draw pipe 46, the drain pipe 32, and the confluence pipe 42 form a part of the siphon drain pipe 44. If the siphon drainage pipe 44 and the pressure relief device 40 are in communication with each other, the operation and effect of this embodiment can be obtained.

FIG. 2(A) shows a cross-sectional shape of the pressure relaxation device 40 connected to the joint pipe 38, and the pressure relaxation device 40, as shown in FIGS. 2(A) and (B), A bag 50 connected to the joint pipe 38 and a cover 52 for covering the bag 50 are provided. As shown in FIG. 3, the joint pipe 38 includes a straight pipe portion 54 connected to the lower end of the drain pipe 32 (see FIG. 1) and an inclined portion extending obliquely upward from the base end side of the straight pipe portion 54. And 56 are formed.

The straight pipe portion 54 is formed in a cylindrical shape, and the upper portion of the straight pipe portion 54 is connected to the drain pipe 32 on the kitchen sink 19 side and communicates with the drain pipe 32 (see FIG. 1 ). A large diameter portion 58 having a diameter larger than that of the general portion is formed at the lower portion of the straight pipe portion 54. A male screw portion 58A is formed on the outer peripheral surface of the lower end portion of the large diameter portion 58, and is configured to be able to connect the merging pipe 42 described above.

The inclined portion 56 is also formed in a tubular shape and communicates with the straight pipe portion 54. The tip portion of the inclined portion 56 is a large-diameter cylindrical attachment portion 62, and the end surface of the attachment portion 62 forms a tapered surface 62A that is inclined toward the base end from the inside toward the outside. Further, a male thread portion 62B for mounting is formed on the outer peripheral surface of the mounting portion 62.

As shown in FIG. 2, the cover 52 is attached to the attachment portion 62. As shown in FIG. 4, the cover 52 includes a cylindrical cover body 64 and a top surface 64A that closes the upper portion of the cover body 64. A large diameter portion 64B is formed at the lower end of the cover body 64, and a female screw portion 64C for mounting is formed on the inner peripheral surface of the large diameter portion 64B (see FIG. 2). Thereby, as shown in FIG. 2, by rotating the large diameter portion 64B of the cover body 64 in accordance with the mounting portion 62 of the joint pipe 38, the female thread portion 64C for mounting on the inner surface of the large diameter portion 64B is attached to the mounting portion. It is configured such that the cover 52 can be attached to the joint pipe 38 by being screwed into the attaching male screw portion 62</b>B of 62. In this mounted state, a facing surface 64D that faces the tapered surface 62A formed on the mounting portion 62 of the joint pipe 38 is formed on the inner side surface of the large diameter portion 64B of the cover 52.

The top surface 64A is formed in a disk shape, and the top surface 64A is formed with a plurality of arc-shaped ventilation holes 64E centered on the central portion. Thereby, the internal pressure change can be suppressed.

As shown in FIG. 2, the bag body 50 is accommodated in the cover 52. The bag body 50 is connected to the drain pipe 32 of the water supply device and configured to receive the pressure from the drain pipe 32 from the inside of the lower portion. As shown in FIGS. 5 and 6, the bag body 50 is formed of a cylindrical rubber member having one end closed.

In the present embodiment, the case where the bag body 50 is made of rubber will be described as an example, but the bag body 50 may be any member having deformable elasticity. As the material, an elastomer other than resin or rubber can be used.

A cylindrical portion 66 having a cylindrical shape is formed at the base end of the body 51 of the bag 50, and an opening 66A for opening the bag 50 is formed. On the tip side of the cylindrical portion 66, an inclined surface 68 that is inclined inward as it goes toward the tip side is formed over the entire circumference. As shown in FIG. 2, the inclined surface 68 is configured to be sandwiched between the above-described tapered surface 62A of the joint pipe 38 and the facing surface 64D inside the cover 52, and to be in close contact with the tapered surface 62A when attached. Has been done. Thus, the connection portion can be sealed by the elasticity of the inclined surface 68 in a state where the inside of the bag body 50 and the joint pipe 38 are in communication with each other.

As shown in FIGS. 5 and 6, a cylindrical inner fitting portion 70 is formed on the tip side of the inclined surface 68, and the inner fitting portion 70 is fitted into the cover 52 at the time of mounting. Is configured. Accordingly, when the cover 52 is removed, the bag body 50 can be prevented from coming off the cover 52.

A shape maintaining portion that maintains the bag body 50 in a self-supporting state is provided on the tip side of the inner fitting portion 70. Here, the shape maintaining section is for maintaining the bag body 50 in a self-supporting state, and can be rephrased as a shape retaining section that retains the shape of the bag body 50, a high rigidity section, a reinforcing section, or the like. Further, the self-supporting state means a state in which the height of the bag body 50 is maintained.

As an example of the shape maintaining section, the bag body 50 is provided with vertical maintaining sections 72 that linearly extend from the base end side to the distal end side at three locations at equal intervals in the circumferential direction. The vertical direction maintaining portion 72 is formed to have a thickness that is slightly harder than other parts during molding, and is elastically deformable, but it is possible to maintain the bag body 50 in an expanded state in the vertical direction. It is configured. That is, the vertical direction maintaining portion 72 has a function of maintaining the height of the bag body 50 in an extended state regardless of the weight of the bag body 50.

The vertical direction maintenance portion 72 has a predetermined width dimension, and the width dimension of the base end portion 72A of the vertical direction maintenance portion 72 is configured to become narrower toward the base end. The base end of the vertical direction maintaining portion 72 ends at a position away from the inner fitting portion 70, and a space between the vertical direction maintaining portion 72 and the inner fitting portion 70 is generally more flexible than the vertical direction maintaining portion 72. It is composed of a section 74.

As shown in FIG. 5, a lateral direction maintaining portion 78, which is an example of a shape maintaining portion, is formed on the top portion 76 of the bag body 50. The lateral direction maintaining portion 78 is formed to be thick so as to be slightly harder than other portions at the time of molding and is elastically deformable, but a part of the bag body 50, that is, an upper end thereof is expanded in the lateral direction. It is configured to be able to maintain.

The lateral direction maintaining portion 78 is formed in a triangular shape that has a radial shape that spreads outward from the central portion in a plan view. Each of the top portions 78A of the lateral direction maintaining portion 78 is formed in a tapered shape, and is configured to be continuous with the tip end portion of the longitudinal direction maintaining portion 72. As a result, in the bag body 50, the portion of the top portion 78A of the lateral direction maintaining portion 78 is maintained in the laterally expanded state, and the vertical direction maintaining portions 72 connected to the top portion 78A are maintained in a separated state. Has been done. In this state, the bag body 50 is configured such that it can stand on its own with the base end portion provided with the opening 66A facing downward, that is, in the same state as when it is installed. The direction maintaining section 78 constitutes a shape maintaining section.

It should be noted that, in the present embodiment, a case has been described as an example where the distal end portions of the vertical direction maintaining portions 72 are maintained in a state of being separated from each other by the horizontal direction maintaining portion 78, but the configuration is not limited to this configuration. .. For example, by connecting the respective vertical direction maintaining portions 72 to each other at their tip portions, a shape maintaining portion that maintains the bag body 50 in an independent state can be configured.

On the peripheral surface of the bag body 50, between the adjacent vertical direction maintenance parts 72, the expansion/contraction part 80 that is more flexible and elastically deformable than the vertical direction maintenance parts 72 is formed. Each expansion/contraction part 80 constitutes a part of the bag body 50, and is configured to expand/contract in the lateral direction by receiving pressure from the drain pipe 32.
Here, the “lateral direction” in which the expansion/contraction part 80 expands/contracts is a direction orthogonal to the self-supporting direction of the bag body 50 maintained in the self-supporting state.
Since each expansion/contraction part 80 is more flexible than the vertical direction maintaining part 72, it cannot stand alone by the expansion/contraction part 80, and its height is maintained by the rigidity of the vertical direction maintaining part 72. When no positive pressure is supplied to the bag body 50, the bag body 50 is in a free state of bending inward. In this state, the expansion/contraction parts 80 from the three sides lean against each other at the center of the bag body 50. Even in this leaning state alone, the bag body 50 can stand on its own.

On the other hand, when the inside of the bag body 50 receives a positive pressure from the drain pipe 32, the expansion/contraction portion 80 is elastically deformed in the lateral direction, so that this portion can be expanded in the lateral direction. Thereby, the gas supplied from the drain pipe 32 to the bag body 50 is temporarily held, and the pressure generated in the drain pipe 32 can be relieved.

In the present embodiment, the bag body 50 is provided with the lateral direction maintaining portion 78 and the longitudinal direction maintaining portion 72, and the expanding/contracting portion 80 is configured to lean against each other in the central portion of the bag body 50, thereby providing a self-supporting state in the installed state. Although the shape maintaining unit that can be maintained is configured, the shape maintaining unit is not limited to this. For example, a shape maintaining unit that maintains the self-supporting state by any one of the above-described structures, or a shape maintaining unit that maintains the self-supporting state when the bag body 50 leans on or is locked in the inner surface of the cover 52. May be configured. In this case, the cover 52 constitutes part or all of the shape maintaining portion.

Further, a shape is provided in which a top hole 64A of the cover 52 is provided with a locking hole, and a locking part to be locked in this locking hole is provided in the bag body 50 to support the bag body 50 on the top surface 64A and maintain an independent state. You may comprise a maintenance part. In this case, the locking portion and the cover 52 form a shape maintaining portion.

Further, although the case where the vertical direction maintaining portion 72 and the horizontal direction maintaining portion 78 are integrally formed with the bag body 50 to form the shape maintaining portion has been described, the present invention is not limited to this. For example, a lateral direction maintaining part that maintains a part of the bag body 50 in a laterally expanded state and a vertical direction maintaining part that maintains the bag body 50 in a longitudinally expanded state are separate members from the bag body 50. It may be configured.

Here, the self-supporting state means a state in which the bag body 50 maintains the height. In addition, the shape maintaining unit refers to a configuration in which the bag body 50 can maintain the height depending on its rigidity, structure, shape, wall thickness, material, or the like, or a member other than the bag body 50. For example, a wire for maintaining the self-supporting state may be integrally provided in the bag body 50 to configure the shape maintaining section, or a wire for maintaining the self-supporting state may be disposed in the bag body 50 to configure the shape maintaining section. Good.

The operation of the present embodiment having the above configuration will be described. When the backflow prevention valve built in the dishwasher 20 is opened and the drainage of the dishwasher 20 is pumped by the pump, the inside of the drain pipe 32 becomes a positive pressure state. Then, the air in the drainage pipe 32 relaxes the positive pressure state, so that the air flows into the pressure relief device 40 via the joint pipe 38, and the bag body 50 expands laterally.

At this time, the bag body 50 is maintained in the self-supporting state, and the bag body 50 has the expansion/contraction part 80 that expands/contracts in the lateral direction upon receiving pressure. Therefore, when the expansion/contraction unit 80 expands in the lateral direction by receiving the pressure from the drainage pipe 32, the expansion resistance is reduced as compared with the bag body to which its own weight is applied during expansion. Therefore, even if the pressure inside the drainage pipe 32 is low, the bag body 50 expands and the pressure can be released.

A part of the bag body 50 is previously expanded in the lateral direction by the lateral direction maintaining portion 78, and by using the expanded portion as a starting point, the bag body 50 can be easily expanded in the lateral direction. Further, in the present embodiment, the lateral direction maintaining portion 78 is formed in a triangular shape that is a radial shape. Therefore, the expansion in the lateral direction, which is the radial direction, becomes easier. Furthermore, since the bag body 50 is previously expanded in the vertical direction by the vertical direction maintaining portion 72, it becomes easier to expand.

Then, the positive pressure generated in the drainage pipe 32 during drainage can be absorbed by the bag body 50 of the pressure relaxation device 40 expanding. Therefore, it is possible to suppress the generation of odor and the discharge of sealing water in the kitchen sink 19 due to the drainage pressure-fed from the dishwasher 20.
Further, regardless of the presence or absence of the dishwasher 20, the air (buoyancy) in the drain pipe 32 that attempts to push back the drain can be released from the drain from the kitchen sink 19. Thereby, smooth drainage can be promoted.
In addition, in the structure in which the drainage trap is attached to the dishwasher 20, the drainage flows through the drainage pipe 32 downward in a full flow state via the drainage trap. At this time, the air in the drain pipe 32 is pressed by the drainage, and the inside of the drain pipe 32 is in a positive pressure state. Then, the air in the drainage pipe 32 relaxes the positive pressure state, so that the air flows into the pressure relief device 40 through the joint pipe 38, and the bag body 50 expands laterally. Thereby, the positive pressure generated in the drain pipe 32 at the time of draining can be absorbed by the bag body 50 of the pressure relaxation device 40, and it is possible to suppress the generation of the sealing water and the odor of the kitchen sink 19.

FIG. 7 is a diagram showing another embodiment, in which the shape of the main body 51 of the bag body 50 used in the pressure relaxation device 40 in plan view is different from that in the first embodiment. That is, in the second embodiment shown in FIG. 7A, the main body portion 51A is formed in a + shape in a plan view, and the top surface portion constitutes the lateral direction maintaining portion 78, and is a portion extending laterally. Constitute the vertical direction maintaining portion 72. In the third embodiment shown in FIG. 7B, the main body portion 51B is formed in a star shape extending in five directions at equal intervals in the circumferential direction, and the top surface portion forms the lateral direction maintaining portion 78. The laterally extending portion constitutes the vertical direction maintaining portion 72.

In FIG. 7C to FIG. 7I, the bag body 50A has a quadrangular shape in plan view. In the fourth embodiment shown in FIG. 7C, the main body portion 51C is formed in an X shape in plan view, the top surface portion constitutes the lateral direction maintaining portion 78, and the laterally extending portion is vertical. The direction maintaining unit 72 is configured. In the fifth embodiment shown in FIG. 7D, the main body 51D is formed in a + shape in plan view, the top surface portion constitutes the lateral direction maintaining portion 78, and the laterally extending portion is vertical. The direction maintaining unit 72 is configured. In the sixth embodiment shown in FIG. 7(E), the main body portion 51E is formed in a planar shape in which V-shaped V-shaped portions 90B extend from both ends of a horizontally long central portion 90A, and the top surface portion is The lateral direction maintaining portion 78 is formed, and the laterally extending portion forms the vertical direction maintaining portion 72.

In the seventh embodiment shown in FIG. 7(F), the main body portion 51F is formed in a T shape in plan view, the top surface portion constitutes the lateral direction maintaining portion 78, and the laterally extending portion is vertical. The direction maintaining unit 72 is configured. In the eighth embodiment shown in FIG. 7(G), the main body 51G is formed in an L shape in plan view, the top surface portion constitutes the lateral direction maintaining portion 78, and the laterally extending portion is vertical. The direction maintaining unit 72 is configured. In 9th Embodiment shown in FIG.7(H), the main-body part 51H is formed in planar view Z shape, the top surface part comprises the horizontal direction maintenance part 78, and the part extended to the side is vertical. The direction maintaining unit 72 is configured. In the tenth embodiment shown in FIG. 7(I), the main body portion 51I is formed in an M shape in a plan view, the top surface portion constitutes the lateral direction maintaining portion 78, and the laterally extending portion is vertical. The direction maintaining unit 72 is configured.

FIG. 8: is a figure which shows 11th Embodiment, and the height dimension of the main body 51 of the bag 50 and the cover 52 used with the pressure relaxation apparatus 40 (refer FIG. 1) is made lower than 1st Embodiment. There is. Further, similarly to the first embodiment, the communication portion 96 that communicates with the inside of the main body portion 51 extends laterally, and an opening 96A is formed at the end of the communication portion 96 to communicate with the drain pipe 32. There is.

Such a bag body 50 can be used in a place where the height dimension cannot be secured.

9 to 14 are views showing a pressure relief device according to the twelfth embodiment, and a description will be given focusing on parts different from the first embodiment, and the same or equivalent parts as in the first embodiment will be described. Omit.

This pressure relief device 140 is also used in the drainage system 10 shown in FIG.
FIG. 9 shows a state in which the pressure relief device 140 is connected to the joint pipe 138, and the pressure relief device 140 is similar to the first embodiment in that the bag body 150 connected to the joint pipe 138 (see FIG. 12 and FIG. 13), and a cover 152 that covers the bag body 150. As shown in FIG. 10, the joint pipe 138 has a straight pipe portion 154 connected to the lower end of the drain pipe 32 (see FIG. 1) and an inclined portion that extends obliquely upward from the base end side of the straight pipe portion 154. And 156 are formed.

The straight pipe part 154 is formed in a cylindrical shape, and the upper part of the straight pipe part 154 is connected to the drain pipe 32 on the kitchen sink 19 side and communicates with the drain pipe 32 (see FIG. 1 ). A large diameter portion 158 having a diameter larger than that of the general portion is formed in the lower portion of the straight pipe portion 154. A male screw portion 158A is formed on the outer peripheral surface of the lower end portion of the large diameter portion 158, and is configured so that the above-mentioned merging pipe 42 can be connected (see FIG. 1).

The inclined portion 156 is also formed in a tubular shape and communicates with the straight pipe portion 154. A large-diameter cylindrical attachment portion 162 is provided at the tip of the inclined portion 156, and the attachment portion 162 is supported by a support rib 156A provided on the inclined portion 156.

On the outer peripheral surface of the mounting portion 162, horizontally-long rectangular engagement protrusions 162B are provided, for example, at three locations. The engagement protrusions 162B are equally spaced in the circumferential direction of the attachment portion 162. It is arranged. As shown in FIGS. 10 and 14, a step portion 162C that is recessed inward is formed on the outer peripheral surface of the upper end portion of the attachment portion 162, and the step portion 162C extends along the general portion 162D. The ring groove 162E is recessed over the entire circumference.

As shown in FIG. 9, the cover 152 is attached to the attachment portion 162. As shown in FIG. 11, the cover 152 includes a cylindrical cover body 164 and a top surface 164A that closes the upper portion of the cover body 164. At the lower end of the cover body 164, horizontally long rectangular engagement holes 164F are opened at, for example, three places, and the engagement holes 164F are arranged at equal intervals in the circumferential direction of the cover body 164. There is.

Each engagement hole 164F is arranged at a position that coincides with an engagement protrusion 162B provided on the attachment portion 162 of the joint pipe 138 (see FIG. 10), and the lower end of the cover 152 is attached to the attachment portion of the joint pipe 138. Each of the engagement protrusions 162B of the joint pipe 138 is configured to be inserted into and engaged with the corresponding engagement hole 164F of the cover 152 in a state where the engagement protrusion 162B is externally fitted to the 162. This constitutes a snap-fit structure for attaching the cover 152 to the joint pipe 138 (see FIGS. 9 and 10).

The method for attaching the cover 152 to the joint pipe 138 is not limited to this. For example, an L-shaped L-shaped groove may be provided in the mounting portion 162 of the joint pipe 138, and a convex portion insertable from the end opening of the L-shaped groove may be provided on the inner surface of the cover 152. In this structure, the convex portion on the inner surface of the cover 152 is inserted into the L-shaped groove from the end opening, and the cover 152 is rotated to move the convex portion to the inner side of the L-shaped groove to move the cover 152 to the joint pipe. Attach to 138.

As shown in FIG. 9, the top surface 164A is formed in a disc shape, and the top surface 164A has a plurality of arc-shaped ventilation holes 164E centered on the central portion, as in the first embodiment. Has been formed. Thereby, the internal pressure change can be suppressed.

As shown in FIGS. 12 and 13, the bag body 150 is accommodated in the cover 152 (see FIG. 2). As shown in FIG. 1, the bag body 150 is connected to the drain pipe 32 of the water supply device and configured to receive the pressure from the drain pipe 32 from the lower inside. As shown in FIGS. 12 and 13, the bag body 150 is formed of a bag-shaped silicone rubber whose one end is closed.

It should be noted that the bag body 150 may be any member having a deformable elasticity, as in the first embodiment, and the material thereof may be an elastomer other than resin or rubber.

A cylindrical portion 166 having a cylindrical shape is formed at the base end of the main body 151 of the bag 150, and an opening 166A for opening the bag 150 is formed. As shown in FIG. 14, a thick portion 166C thicker than the general portion 166B is integrally formed at the base end of the cylindrical portion 166 over the entire circumference. It is configured so that it can be positioned in a ring groove 162E formed in the mounting portion 162 of the pipe 138.

As a result, with the cover 152 attached to the joint pipe 138, the inner peripheral surface of the thick portion 166C is in close contact with the joint pipe 138 and the outer peripheral surface of the thick portion 166C is in close contact with the cover 152. The ends are sealed to ensure airtightness. With such a simple structure, the bag 150 can be reliably sealed, and the leakage of odor from the drain pipe 32 shown in the first embodiment can be suppressed.

As shown in FIGS. 12 and 13, a shape maintaining portion that maintains the bag body 150 in a self-supporting state is provided on the tip side of the cylindrical portion 166. Similar to the first embodiment, the shape maintaining unit maintains the bag body 150 in a self-supporting state, and is paraphrased to a shape retaining unit that retains the shape of the bag body 150, a high-rigidity unit, a reinforcing unit, or the like. be able to. Further, the self-supporting state means a state in which the height of the bag body 150 is maintained in an extended state.

As an example of the shape maintaining section, the bag body 150 is formed with three vertical maintaining sections 172 linearly extending from the base end side to the distal end side at equal intervals in the circumferential direction. The vertical direction maintaining portion 172 is formed to have a thickness that is slightly harder than other portions during molding, and is elastically deformable, so that the bag body 150 can be maintained in an expanded state in the vertical direction. It is configured. That is, the vertical direction maintaining portion 172 has a role of maintaining the height of the bag body 150 in an extended state regardless of the weight of the bag body 150.

As shown in FIG. 13, the base end of the vertical direction maintaining portion 172 ends at a position apart from the cylindrical portion 166, and the vertical direction maintaining portion 172 and the end edge of the cylindrical portion 166 maintain the vertical direction. The general portion 174 is more flexible than the portion 172.

On the top portion 176 of the bag body 150, a lateral direction maintenance portion 178 is formed as an example of a shape maintenance portion. The lateral direction maintaining portion 178 is formed thick so as to be slightly harder than the other portions at the time of molding, and is elastically deformable, but a part of the bag body 150, that is, an upper end is laterally expanded. It is configured to be able to maintain.

The lateral direction maintenance portion 178 is formed in a shape that extends outward from the central portion by curving in a plan view. It should be noted that this shape can be rephrased as a shape that is convexly curved and extends to one side in the circumferential direction or a propeller shape.

Each top portion 178A of the lateral direction maintenance portion 178 is configured to be continuous with the tip end portion of the longitudinal direction maintenance portion 172. As a result, in the bag body 150, the portion of the top portion 178A of the lateral direction maintenance portion 178 is maintained in the laterally expanded state, and the vertical direction maintenance portions 172 connected to the top portion 178A are separated from each other. Has been maintained. In this state, the bag body 150 is configured such that it can stand on its own with the base end portion provided with the opening 166A facing downward, that is, in the same state as when it is installed. The direction maintaining section 178 constitutes a shape maintaining section.

From the edge of the lateral direction maintaining portion 178, an expanding/contracting portion 180 that is softer and more easily elastically deformed than the vertical direction maintaining portion 72 extends substantially straight toward the general portion 174 on the lower end side. It is continuous with the general section 174. The expansion/contraction part 180 constitutes a part of the bag body 150 and is configured to expand/contract in the lateral direction by receiving the pressure from the drain pipe 32. Thereby, the gas supplied from the drain pipe 32 to the bag body 150 is temporarily held, and the pressure generated in the drain pipe 32 is relieved. Since each expansion/contraction part 180 is more flexible than the vertical direction maintaining part 172, it cannot stand alone by the expansion/contraction part 180, and its height is maintained by the rigidity of the vertical direction maintaining part 172.

In the present embodiment having the above configuration, the same operational effect as that of the first embodiment can be obtained.

The bag body 150 of the present embodiment has a volume when expanded by receiving a positive pressure from the drain pipe 32, as compared with the bag body 50 having the planar shape of the first to eleventh embodiments described above. Can be large.
Therefore, the positive pressure reducing function can be improved.

DESCRIPTION OF SYMBOLS 10... Drainage system, 19... Kitchen sink, 20... Dishwasher, 32... Drainage pipe, 46... Horizontal pipe, 48... Vertical pipe, 50... Bag body, 72... Vertical maintenance part, 78... Horizontal maintenance part , 80... expansion/contraction part 150... bag body, 172... vertical direction maintaining part, 178... lateral direction maintaining part, 180... expansion/contraction part

Claims (4)

A bag body including an opening for communicating with the drainage pipe of the water supply device and receiving pressure from the drainage pipe from the inside of the lower portion, and a top portion provided in the upper portion,
A shape maintaining portion for maintaining the bag body in an independent state,
An expanding/contracting part which constitutes a part of the bag body and expands/contracts in the lateral direction by receiving the pressure,
Have a,
The shape maintaining unit includes a lateral direction maintaining unit that maintains a part of the bag body in a laterally extending state,
The pressure relief device in which the lateral direction maintenance portion is formed in the top portion as a part of the bag body . The pressure relief device according to claim 1 , wherein the lateral direction maintaining portion is formed in a radial shape. The pressure relief device according to claim 1 or 2 , wherein the shape maintaining unit includes a vertical direction maintaining unit that maintains a state in which a part of the bag body extends in the vertical direction. The drain pipe for flowing the drainage from the water supply device downward, a horizontal pipe for flowing the drainage from the drain pipe in a lateral direction, and a vertical pipe for flowing the drainage from the horizontal pipe downward,
A drainage system in which the pressure relief device according to any one of claims 1 to 3 is connected to the drainage pipe.