CN213653635U - Anti-overflow structure and drainage riser device - Google Patents

Abstract

The utility model relates to an anti-overflow structure and drainage riser device, a serial communication port, the drainage riser is prevented anti-overflow device and is included: the drainage device comprises a drainage piece and an anti-overflow piece, wherein a containing cavity is arranged in the drainage piece, and a first connector and a second connector are respectively arranged at two opposite ends of the drainage piece; the anti-overflow piece is arranged on the wall of the containing cavity and divides the containing cavity into at least two sub-cavities along the length direction of the drainage piece, wherein one sub-cavity is communicated with the first interface, the other sub-cavity is communicated with the second interface, the anti-overflow piece is provided with a perforation, and when fluid flows along the direction from the first interface to the second interface, the perforation can be opened; when fluid flows along the direction from the second connector to the first connector, the through hole can be closed, and the anti-overflow structure can effectively prevent the upward anti-overflow phenomenon caused by accumulation and blockage of sewage or sludge at the lower end of the pipeline; meanwhile, the phenomenon of odor overflowing is effectively prevented, and the cleanness of the environment is ensured.

Description

Anti-overflow structure and drainage riser device

Technical Field

The utility model relates to a building drainage technical field especially relates to an anti-overflow structure and drainage riser device.

Background

Along with the development of building drainage technology, a sewage anti-overflow technology appears. As is known, when the water outlet of sanitary equipment in various existing house buildings is directly communicated with a water return pipeline, a pipeline with a return bend is adopted, and the sewage back-flowing or odor overflowing in a sewer is mainly prevented. However, the design occupies a large space of the next floor, the height and the attractiveness of the suspended ceiling are affected, and when the appliances on the upper part of the high floor drain, sewage at the sanitary appliances on the bottom conversion layer can overflow to the indoor environment, so that the environmental pollution is caused. When the horizontal main pipeline for drainage of the conversion floor is silted up, the sanitary ware connected with the upper stream part of the silted up part of the horizontal main pipeline is easy to have the phenomenon of back overflow, which brings great inconvenience to the life of people.

SUMMERY OF THE UTILITY MODEL

Based on the above, there is a need for an anti-overflow structure and a vertical drainage pipe device, which can effectively prevent the upward overflow phenomenon caused by the accumulation and blockage of sewage or sludge at the lower end of a pipeline; meanwhile, the phenomenon of odor overflowing is effectively prevented, and the cleanness of the environment is ensured.

An anti-spill structure comprising: the drainage device comprises a drainage piece, a first connector and a second connector, wherein a containing cavity is arranged in the drainage piece, and the two opposite ends of the drainage piece are respectively provided with the first connector and the second connector; the anti-overflow piece is arranged on the wall of the containing cavity and divides the containing cavity into at least two sub-cavities along the length direction of the drainage piece, wherein one sub-cavity is communicated with the first interface, the other sub-cavity is communicated with the second interface, and the anti-overflow piece is provided with a through hole which can be opened when fluid flows along the direction from the first interface to the second interface; the perforations can be closed when fluid flows in a direction from the second port to the first port.

In the assembly process of the anti-overflow structure, the anti-overflow piece is firstly arranged on the cavity wall of the accommodating cavity; then connecting the first water drainage pipe to the pipe wall of the first connector of the water drainage piece; and finally, connecting the second drain pipe with the second interface pipe wall of the drainage piece. Since the anti-overflow member divides the accommodation chamber into at least two sub-chambers in the length direction, when the fluid flows into the drainage member from the first drainage pipe, the perforation of the anti-overflow member is opened, so that the fluid smoothly flows into the second port from the first port. When the fluid of the second drain pipe overflows, the through hole on the overflow piece is closed, and the fluid is blocked from flowing into the split cavity communicated with the first connector, so that the phenomenon of upward overflow caused by accumulation and blockage of sewage or sludge at the lower end of the pipeline is effectively prevented. Meanwhile, the phenomenon of odor overflowing is effectively prevented, and the cleanness of the environment is ensured.

In one embodiment, the cross section of the divided chamber is taken in a plane perpendicular to the length direction of the drainage member, and at least a part of the cross section of the divided chamber communicating with the first port has an area which increases along the length direction of the drainage member from the end of the divided chamber close to the first port.

In one embodiment, the drain member is provided with a first connecting portion, the first connecting portion is arranged around the first interface, and the first connecting portion is used for being connected with a first drain pipe.

In one embodiment, the cross section of the divided chamber is taken in a plane perpendicular to the length direction of the drainage member, and at least a part of the cross section of the divided chamber communicating with the second port has an area which increases along the length direction of the drainage member from the end of the divided chamber close to the second port.

In one embodiment, a second connecting portion is disposed on the drainage member, the second connecting portion surrounds the second port, and the second connecting portion is used for connecting with a second drainage pipe.

In one embodiment, the overflow prevention member is convexly disposed in a direction toward the second port, and the overflow prevention member is upwardly arched around a side of the through hole in a direction toward the through hole.

In one embodiment, the spill guard is a flexible member.

In one embodiment, the flexible member is a rubber member.

In one embodiment, the drainage riser device comprises a first drainage pipe and a second drainage pipe, wherein the anti-overflow structure is described above, the first drainage pipe is communicated with the first connecting port, and the second drainage pipe is communicated with the second connecting port.

In the assembly process of the drainage vertical pipe device, the anti-overflow piece is firstly arranged on the cavity wall of the accommodating cavity; then connecting the first water drainage pipe to the pipe wall of the first connector of the water drainage piece; and finally, connecting the second drain pipe with the second interface pipe wall of the drainage piece. Since the anti-overflow member divides the accommodation chamber into at least two sub-chambers in the length direction, when the fluid flows into the drainage member from the first drainage pipe, the perforation of the anti-overflow member is opened, so that the fluid smoothly flows into the second port from the first port. When the fluid of the second drain pipe overflows, the through hole on the overflow piece is closed, and the fluid is blocked from flowing into the split cavity communicated with the first connector, so that the phenomenon of upward overflow caused by accumulation and blockage of sewage or sludge at the lower end of the pipeline is effectively prevented. Meanwhile, the phenomenon of odor overflowing is effectively prevented, and the cleanness of the environment is ensured.

In one embodiment, the first drain pipe is screwed with one end of the drain member.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an anti-overflow structure in one embodiment.

Description of reference numerals:

100. the anti-overflow structure comprises an anti-overflow structure 110, a first connecting part 111, a first interface 120, an anti-overflow part 121, a perforation 130, an accommodating cavity 131, a split cavity 140, a second connecting part 141, a second interface 150 and a drainage part.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

In one embodiment, referring to fig. 1, an anti-overflow structure 100 includes: a drain 150 and an anti-spill 120. The inside of the drainage member 150 is provided with a receiving cavity 130, and opposite ends of the drainage member 150 are respectively provided with a first connector 111 and a second connector 141. The anti-overflow piece 120 is arranged on the cavity wall of the containing cavity 130 and divides the containing cavity 130 into at least two sub-cavity 131 along the length direction of the drainage piece 150, wherein one sub-cavity 131 is communicated with the first interface 111, the other sub-cavity 131 is communicated with the second interface 141, the anti-overflow piece 120 is provided with a perforation 121, and when fluid flows along the direction from the first interface 111 to the second interface 141, the perforation 121 can be opened; when fluid flows in a direction from the second port 141 to the first port 111, the perforation 121 can be closed.

In the above anti-overflow structure 100, during the assembly process, the anti-overflow element 120 is firstly installed on the cavity wall of the accommodating cavity 130; then the first drainage pipe is connected to the pipe wall of the first connector 111 of the drainage piece 150; finally, the second drain pipe is connected with the pipe wall of the second interface 141 of the drain member 150. Since the anti-overflow member 120 divides the receiving chamber 130 into at least two sub-chambers 131 in a length direction, when the fluid flows into the drain member 150 from the first drain pipe, the penetration hole 121 of the anti-overflow member 120 is opened, so that the fluid smoothly flows into the second port 141 from the first port 111. When the fluid in the second drainage pipe overflows, the through hole 121 on the overflow preventing member 120 is closed to prevent the fluid from flowing into the branch chamber 131 communicated with the first connector 111, thereby effectively preventing the upward overflow phenomenon caused by the accumulation and blockage of the sewage or sludge at the lower end of the pipeline. Meanwhile, the phenomenon of odor overflowing is effectively prevented, and the cleanness of the environment is ensured.

Further, referring to fig. 1, in the divided chamber 131 communicating with the first port 111, at least a portion of the cross-sectional area of the divided chamber 131, which is taken along a plane perpendicular to the length direction of the drain member 150, increases from the end of the divided chamber 131 near the first port 111 along the length direction of the drain member 150. Thus, when the fluid is discharged into the drainage member 150 from the first connector 111, the cross-sectional area of the pipeline has an increasing process, and when the fluid with the same volume is discharged, the flow rate of the fluid is reduced, and the impact force of the fluid on the anti-overflow member 120 is reduced, so that the structure of the anti-overflow member 120 is protected, the service life of the anti-overflow member 120 is effectively prolonged, and the anti-overflow member 120 is ensured to have a good anti-overflow effect.

In order to facilitate clear understanding of the length direction of the drainage member 150 of the present embodiment, taking fig. 1 as an example, the length direction of the drainage member 150 is S in fig. 1₁The direction indicated by any arrow.

It should be noted that a cross section taken through the dispenser chamber 131 in a plane perpendicular to the length direction of the drainage member 150 is understood as: the cross section of the drainage member 150 is taken on a plane perpendicular to the length direction of the drainage member 150 with the length direction of the drainage member 150 as the vertical direction, and the area of the cross section is the area of the cross section.

In order to facilitate clear understanding of the position of the cross section of the present embodiment, fig. 1 is taken as an example, and the cross sectional area is S in fig. 1₂The indicated area.

In addition, the area of the cross section of at least a part of the split cavity 131 increases from the end near the first port 111 along the length direction of the drainage member 150, which is understood as: the increase in cross-sectional area can be achieved in a variety of ways, such as: first, the area of the cross section gradually increases from one end of the first joint 111 to the overflow prevention member 120 along the length direction of the drain member 150; secondly, starting from one end of the first connector 111, along the length direction of the drainage member 150 to the anti-overflow member 120, the area of the cross section is increased firstly and then is unchanged; thirdly, starting from one end of the first connector 111, along the length direction of the drainage member 150 to the anti-overflow member 120, the area of the cross section is increased firstly, then is unchanged and then is increased; fourth, starting from one end of the first joint 111, along the length direction of the drainage member 150 to the anti-overflow member 120, the area of the cross section is unchanged first, then increased, and then unchanged. Particularly, in the present embodiment, the area of the cross section is increased first and then is not changed, so that the volume and the drainage effect of the drainage member 150 can be ensured. The present embodiment provides only an embodiment in which the area of the cross section increases from the end of the sub-chamber 131 close to the first port 111 along the length direction of the drainage member 150, but is not limited thereto.

In one embodiment, referring to fig. 1, the drainage member 150 is provided with a first connection portion 110, the first connection portion 110 is disposed around the first joint 111, and the first connection portion 110 is used for connecting with a first drainage pipe. So arranged, the connection of the drain 150 to the first drain pipe is facilitated; meanwhile, the first drain pipe is disposed above the height direction of the drain member 150, so that the fluid of the first drain pipe can smoothly flow into the drain member 150.

Alternatively, the first connection portion 110 may be connected to the first drain pipe by a snap connection, a glue and waterproof tape, a screw connection, or other connection methods.

Specifically, the first connection portion 110 is provided with an internal thread. First connecting portion 110 is threaded connection with the connected mode of first drain pipe, and so connected mode stability is higher, and the leakproofness is strong, can not produce the condition of seepage at first drain pipe to the drainage 150 in-process, is favorable to improving the quality of preventing anti-overflow structure 100.

In one embodiment, the cross-sectional area of the divided chamber 131 taken in a plane perpendicular to the length direction of the drain member 150 is increased in the length direction of the drain member 150 from the end of the divided chamber 131 near the second port 141 in the divided chamber 131 communicating with the second port 141. Thus, when the fluid flows from the drainage member 150 to the second drainage pipe, the cross-sectional area of the pipeline is reduced, and the flow velocity of the fluid is increased when the fluid with the same volume is discharged, so that the impact force of the fluid on the second drainage pipe can be improved. On the other hand, when the second drainage pipe is blocked, the flow velocity of the fluid in the back overflow process is reduced, which is beneficial to reducing the back overflow speed, and the impact strength of the fluid on the back overflow piece 120 is reduced, so that the service life of the back overflow piece 120 is effectively prolonged, and the back overflow piece 120 is ensured to have a good back overflow prevention effect.

Specifically, the area of at least a portion of the cross section increases from the end of the sub-chamber 131 near the second port 141 along the length of the drainage member 150, which is understood as: the manner in which the area of the cross-section increases can be varied. Such as: first, the area of the cross section increases from one end of the second port 141 along the length direction of the drain member 150 to the anti-overflow member 120; secondly, starting from one end of the second interface 141, along the length direction of the drainage member 150 to the anti-overflow member 120, the area of the cross section is firstly increased and then is unchanged; thirdly, starting from one end of the second interface 141, along the length direction of the drainage member 150 to the anti-overflow member 120, the area is increased firstly, then is unchanged and then is increased; fourth, starting from one end of the second port 141, the area of the cross section from the drain member 150 to the anti-overflow member 120 is constant first, then increases, and then is constant. Particularly, in the present embodiment, the area of the cross section is increased first and then is not changed, so that the volume and the drainage effect of the drainage member 150 can be ensured. The present embodiment provides only an embodiment in which the area of the cross section increases from the end of the sub-chamber 131 close to the second port 141 along the length direction of the drainage member 150, but is not limited thereto.

In order to facilitate clear understanding of the position of the cross section of the present embodiment, fig. 1 is taken as an example, and the cross sectional area is S in fig. 1₃The indicated area.

In one embodiment, referring to fig. 1, the drainage member 150 is provided with a second connecting portion 140, the second connecting portion 140 is disposed around the second port 141, and the second connecting portion 140 is used for connecting with a second drainage pipe. So set up, be favorable to being connected of drain 150 and second drain pipe, the below of drain 150 direction of height is located to the second drain pipe for the fluid of first drain pipe can flow into the second drain pipe smoothly through drain 150.

Alternatively, the second connection part 140 may be connected to the second drain pipe by a snap connection, a glue and waterproof tape bonding, a screw connection, or other connection means.

Specifically, the second connection part 140 is provided with an internal thread. The second connecting portion 140 is in threaded connection with the second drain pipe, so that the stability of the connecting manner is higher, and the sealing performance is strong. The leakage of the drain member 150 to the second drain pipe is not generated, which is advantageous for improving the quality of the anti-overflow structure 100.

In one embodiment, spill guard 120 is raised in a direction toward second port 141, and spill guard 120 is raised in a direction toward perforation 121 around a side of perforation 121. Therefore, the anti-overflow piece 120 is arranged towards the drainage direction, so that the drainage is facilitated to be smooth, and the influence on the drainage effect is reduced or even avoided when no blockage exists. On the other hand, when the fluid in the second drainage pipe overflows to the drainage member 150, since the overflow preventing member 120 is arched around one side of the through hole 121 in a direction toward the through hole 121, it is advantageous to increase a contact area between the fluid and the overflow preventing member 120, so that the circumferential overflow preventing member 120 disposed in the receiving cavity 130 is jacked up by the fluid, thereby reducing and closing the through hole 121 in the middle, and achieving an effect of preventing the fluid from continuously overflowing upwards.

Optionally, the connection of the anti-spill member 120 and the drainage member 150 may be by gluing, snap-fit, bolted interference fit or other connection.

Specifically, a circle of clamping grooves are formed in the inner wall of the drainage piece 150, a connecting part is arranged at one end of the anti-overflow piece 120, which is connected with the drainage piece 150, and the connecting part is connected with the clamping grooves in an interference fit and clamping manner; after the connection, the sealing glue is used for sealing the edge, so that the anti-overflow piece 120 is more stably connected in the drainage piece 150, and the service life and the use effect of the anti-overflow piece 120 are effectively prolonged. The present embodiment provides only one connection way of the overflow preventing member 120 and the drainage member 150, but not limited thereto.

Further, the number of the overflow preventing members 120 is two or more, and the two or more overflow preventing members 120 are spaced apart in the height direction of the drain member 150. Thus, the multiple anti-overflow pieces 120 are arranged, so that the difficulty of the fluid overflowing from the second drain pipe to the first drain pipe is increased, and the anti-overflow effect of the anti-overflow structure 100 is improved.

In one embodiment, the anti-spill 120 is a flexible member. Thus, the movement of the anti-overflow part 120 in the accommodating cavity 130 is facilitated, and when the fluid in the second drainage pipe overflows to the drainage part 150, the anti-overflow part 120 can better shrink upwards, so as to shrink and close the through hole 121, so that the fluid overflowing upwards in the second drainage part 150 cannot overflow upwards.

In one embodiment, the flexible member is a rubber member. The rubber member is elastically deformed, so that the anti-overflow member 120 can move in the accommodating cavity 130, and when the fluid in the second drainage pipe overflows to the drainage member 150, the anti-overflow member 120 can better contract upwards, so as to reduce and close the through hole 121, so that the upward anti-overflow fluid in the second drainage pipe cannot continue to flow upwards.

In one embodiment, referring to fig. 1, a vertical drainage pipe device includes the above-mentioned anti-overflow structure 100 of a first drainage pipe and a second drainage pipe. The first drain pipe is communicated with the first connecting port, and the second drain pipe is communicated with the second connecting port. Therefore, the common internal and external drainage function of the building can be finished through the first drainage pipe, the second drainage pipe and the drainage vertical pipe device, and the anti-overflow technical effect is achieved. Under normal conditions, fluid flows into the anti-overflow structure 100 from the first drainage pipe and then flows to the second drainage pipe, and when the second drainage pipe is blocked, the anti-overflow structure 100 can prevent the fluid sewage in the second drainage pipe from overflowing back into the first drainage pipe.

In the assembly process of the drainage riser device, the anti-overflow piece 120 is firstly arranged on the wall of the accommodating cavity 130; then the first drainage pipe is connected to the pipe wall of the first connector 111 of the drainage piece 150; finally, the second drain pipe is connected with the pipe wall of the second interface 141 of the drain member 150. Since the anti-overflow member 120 divides the receiving chamber 130 into at least two sub-chambers 131 in a length direction, when the fluid flows into the drain member 150 from the first drain pipe, the penetration hole 121 of the anti-overflow member 120 is opened, so that the fluid smoothly flows into the second port 141 from the first port 111. When the fluid in the second drainage pipe overflows, the through hole 121 on the overflow preventing member 120 is closed to prevent the fluid from flowing into the branch chamber 131 communicated with the first connector 111, thereby effectively preventing the upward overflow phenomenon caused by the accumulation and blockage of the sewage or sludge at the lower end of the pipeline. Meanwhile, the phenomenon of odor overflowing is effectively prevented, and the cleanness of the environment is ensured.

Further, the first drainage pipe may be a vertical drainage pipe, and may also be a hand washing basin, a bathtub, a toilet, a floor drain or other drainage components. Therefore, the application scenes of the anti-overflow structure 100 can be enriched, the anti-overflow structure 100 can be used at a plurality of drainage components, the anti-overflow function is exerted, and the application of the anti-overflow structure 100 is improved.

In one embodiment, the first drain pipe is threadedly coupled to one end of the drain member 150. Because the riser connection technology uses threaded connection mostly, so, be favorable to making anti-overflow structure 100 can be fit for more use scenes, threaded connection's mode is also favorable to improving the stability that first drain pipe and drain 150 are connected, prevents that the junction from seeping water, improves the quality of anti-overflow structure 100.

In one embodiment, the second drain pipe is threaded to one end of the drain member 150. Because the riser connection technology uses threaded connection mostly, so, be favorable to making anti-overflow structure 100 can be fit for more use scenes, threaded connection's mode is also favorable to improving the stability that second drain pipe and drain 150 are connected, prevents that the junction from seeping water, improves the quality of anti-overflow structure 100.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. An anti-spill structure, characterized in that the anti-spill structure comprises:

the drainage device comprises a drainage piece, a first connector and a second connector, wherein a containing cavity is arranged in the drainage piece, and the two opposite ends of the drainage piece are respectively provided with the first connector and the second connector;

the anti-overflow piece is arranged on the wall of the containing cavity and divides the containing cavity into at least two sub-cavities along the length direction of the drainage piece, wherein one sub-cavity is communicated with the first interface, the other sub-cavity is communicated with the second interface, and the anti-overflow piece is provided with a through hole which can be opened when fluid flows along the direction from the first interface to the second interface; the perforations can be closed when fluid flows in a direction from the second port to the first port.

2. An anti-spill over structure as claimed in claim 1, wherein a cross section of the divided chamber taken in a plane perpendicular to a lengthwise direction of the drain member is formed such that, in the divided chamber communicating with the first port, an area of at least a part of the cross section increases from an end of the divided chamber adjacent to the first port in a lengthwise direction of the drain member.

3. An anti-overflow structure as claimed in claim 1, wherein the drain member is provided with a first connection portion, the first connection portion being provided around the first joint, the first connection portion being adapted to be connected to a first drain pipe.

4. An anti-spill over structure as claimed in claim 1, wherein a cross section of the divided chamber taken in a plane perpendicular to a lengthwise direction of the drain member is formed such that, in the divided chamber communicating with the second port, an area of at least a part of the cross section increases from an end of the divided chamber adjacent to the second port in a lengthwise direction of the drain member.

5. An anti-spill over structure as claimed in claim 1, wherein a second connecting portion is provided on the drain member, the second connecting portion being provided around the second joint, the second connecting portion being for connection with a second drain pipe.

6. An anti-spill structure as recited in claim 1, wherein the spill guard is raised in a direction toward the second port and the spill guard is raised in a direction toward the bore around a side of the bore.

7. An anti-spill structure as in claim 6, wherein the spill guard is a flexible member.

8. An anti-spill structure as in claim 7, wherein the flexible member is a rubber member.

9. A drainage riser device, characterized in that the drainage riser device comprises a first drainage pipe, a second drainage pipe and an anti-spill structure according to any one of claims 1 to 8, wherein the first drainage pipe is communicated with the first interface, and the second drainage pipe is communicated with the second interface.

10. The drain riser apparatus according to claim 9, wherein the first drain pipe is threaded to an end of the drain member.

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