A V-shaped conversion bend for preventing odor and maintenance of building drainage main stand pipe

Abstract

The utility model discloses a V-shaped conversion elbow for preventing odor and overhauling of building drainage main vertical pipe, relate to building water supply and drainage technical field. The conversion elbow includes V-shaped elbow pipe body, is equipped with vertical riser connecting port and horizontal cross main pipe connecting port on it, and the both are connected through U-shaped bending part, and the U-shaped bending part bottom forms structural water seal. In the vicinity of riser connecting port and cross main pipe connecting port, above water seal water level line, respectively set up riser side cleaning and overhauling mouth and cross main pipe side cleaning and overhauling mouth. The utility model discloses permanent effective water seal prevents odor through V-shaped structure, and insulates sewer odor, and through the overhauling mouth of two -way arrangement, need not destroy structure to carry out convenient dredging and check to the drainage riser upstream and the cross main pipe downstream of going out of the house. It integrates the function of preventing odor and two -way overhauling, effectively solved the difficult problem of traditional connection mode odor back overflow and inconvenient overhauling, significantly promoted building drainage system end performance and maintainability.

Description

Technical Field

[0001] This utility model relates to the field of building water supply and drainage engineering technology, and in particular to a V-shaped conversion elbow for odor prevention and maintenance of building drainage main risers. Specifically, it relates to a special pipe fitting for connecting the main drainage riser and the horizontal branch pipe in a building drainage system, and in particular to a V-shaped conversion elbow that has both permanent water seal odor prevention and bidirectional maintenance and dredging functions. Background Technology

[0002] In building drainage systems, the connection between the main drainage riser (or main riser) and the horizontal branch line is a crucial node. According to the "Standard for Design of Building Water Supply and Drainage" (GB 50015-2019) and related engineering practices, the treatment of this part directly affects the operational efficiency of the entire drainage system, the quality of the indoor environment, and the convenience of later maintenance.

[0003] Currently, the existing technologies commonly used in this connection part mainly have the following two forms and their inherent defects:

[0004] Using a 90° elbow connection: This is the most common and simplest connection method. However, this method has a fundamental flaw: it cannot form any form of water seal. This allows the building's internal drainage riser to be directly connected to the horizontal sewer mains leading to the septic tank or municipal sewer network. When negative pressure (suction effect) is generated in the drainage riser due to rapid water flow, or positive pressure is generated due to blockage at the bottom, odors, harmful gases, and even germs from the sewer system will overflow unimpeded through the horizontal mains into the sanitary fixtures of the lowest-floor residents connected to the mains, causing serious indoor environmental pollution and affecting residents' health and quality of life. This is the most pressing problem to be solved in existing technologies.

[0005] Elbows or tees with unidirectional cleanout ports are used: To facilitate maintenance, some designs include cleanout ports with openable covers. For example, the rotatable cleanout connector for drainage pipes disclosed in Chinese Utility Model Patent Publication No. CN204266343U belongs to the field of building installation pipeline technology. To address the technical problem that existing connectors and drainage pipes, as well as cleanout ports and connectors, are fixedly connected, and the cleanout port can only be installed in one direction, a rotatable cleanout connector for drainage pipes is provided. This connector includes a rotating cylinder, a connecting seat, and a drainage inner cylinder. The outer wall of the drainage inner cylinder has a circular positioning groove, and the inner wall of the rotating cylinder has a circular hanging lug. The rotating cylinder is suspended in the circular positioning groove via the hanging lug and tightly fitted with the drainage inner cylinder. The drainage inner cylinder has a vertical drain outlet and a horizontal cleanout port. The rotating cylinder is connected to the upper and lower ends of the drainage pipe via the connecting seat. This technology facilitates the clearing of downstream horizontal main pipes to some extent. However, it has significant shortcomings:

[0006] Complete lack of odor prevention function: This type of cleaning port was originally designed for maintenance only, and its structure itself does not integrate a water seal device. Therefore, like a regular 90° elbow, it cannot block the flow of odors.

[0007] Inadequate maintenance functionality: Its unidirectional design only allows for clearing of the downstream horizontal main pipe. When blockage occurs on the riser side upstream of the bend, this cleaning port cannot provide an effective maintenance route. Maintenance personnel often have to resort to destructive methods such as breaking through walls and floors to clear the blockage, which is time-consuming, labor-intensive, costly, and damages the building structure.

[0008] Insufficient systemic design: Existing technologies are merely simple stacking of functions, failing to provide an integrated and proprietary design for this critical node from a systemic perspective of "odor prevention - pressure balance - two-way maintenance," resulting in its inability to meet the high reliability, high maintainability, and high standards of living environment required by modern buildings for drainage systems.

[0009] In summary, the closest existing technology can be considered to be the second method mentioned above, which uses an elbow or connector with a one-way cleanout at the junction of the drainage riser and the horizontal main pipe. However, its shortcomings in odor prevention and comprehensive maintenance limit its application effectiveness and value.

[0010] Therefore, there is an urgent need in this field for a special pipe fitting that can systematically solve the above problems and integrate efficient water seal odor prevention and convenient two-way maintenance functions to replace traditional simple elbows or incomplete cleaning port connectors. Utility Model Content

[0011] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a V-shaped conversion elbow for odor prevention and maintenance of building drainage main risers. This conversion elbow aims to form a permanent structural water seal through its unique V-shaped structure, effectively isolating sewer odors. Furthermore, by setting up bidirectional cleaning and maintenance ports, it enables convenient and non-destructive dredging and inspection in both directions: upstream of the drainage riser and downstream of the horizontal main pipe leading out of the building. This comprehensively improves the performance and maintainability of the terminal nodes of the building drainage system.

[0012] The above-mentioned utility model objective is achieved through the following technical solution:

[0013] This utility model provides a V-shaped conversion elbow for odor prevention and maintenance of main drainage risers in buildings. It is an independent pipe fitting, comprising: a V-shaped bend body having a vertically upward-facing riser connection port, a horizontally or inclined outward-facing horizontal main pipe connection port, and a U-shaped bend connecting the two, the bottom of the U-shaped bend forming a groove for accumulating water to form a water seal; a riser-side cleaning and maintenance port opened on the V-shaped bend body, located near the riser connection port, with its opening above the design water level line of the water seal; and a horizontal main pipe-side cleaning and maintenance port opened on the V-shaped bend body, located near the horizontal main pipe connection port, with its opening above the design water level line of the water seal.

[0014] According to one embodiment of the present invention, both the riser side cleaning and maintenance port and the horizontal trunking side cleaning and maintenance port are equipped with an openable sealing cover, and a sealing ring is provided between the sealing cover and the pipe body interface.

[0015] According to one embodiment of the present invention, the sealing cap is detachably sealed to the V-shaped bend body through a threaded connection, snap-fit ​​connection, flange bolt connection, or quick-locking mechanism.

[0016] According to one embodiment of the present invention, the angle between the central axis of the cleaning and maintenance port on the riser side and the vertical direction is between 0 degrees and 45 degrees; the angle between the central axis of the cleaning and maintenance port on the horizontal main pipe side and the horizontal direction is between 0 degrees and 30 degrees.

[0017] According to one embodiment of the present invention, the effective depth of the water seal formed by the U-shaped bend is not less than 50 mm.

[0018] According to one embodiment of the present invention, the V-shaped bend is made of engineering plastic, stainless steel or ductile iron.

[0019] According to one embodiment of the present invention, the inner wall of the V-shaped bend is smooth, and its riser connection port and horizontal trunk pipe connection port are standardized pipe interfaces.

[0020] According to one embodiment of the present invention, the V-shaped bend is further provided with an observation mirror or transparent observation window for observing the water seal level.

[0021] According to one embodiment of the present invention, the V-shaped bend is a box-type structure with a cross-sectional dimension larger than that of the pipe it connects to.

[0022] According to one embodiment of the present invention, the conversion elbow is specifically used to connect the end of the main drainage riser of a building to the beginning of the horizontal drain pipe, and is installed in the inspection well, pipe interlayer or equipment room at the bottom of the building.

[0023] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0024] Odor prevention at the source, ensuring a safe indoor environment: Its inherent V-shaped structure automatically forms a reliable structural water seal at the system's end, fundamentally and physically isolating the airborne connection between the drainage riser system and the outdoor sewer system. This effectively prevents odors, harmful gases, and pathogens from invading the building's ground floor through the piping system, significantly improving the hygiene standards and comfort of the living environment.

[0025] Revolutionary Inspection and Maintenance, Convenient and Efficient: Two-Way Unblocking: The innovative dual-cleaning port design overcomes the limitations of traditional single-way cleaning ports. Maintenance personnel can effectively unblock both the upstream riser and downstream horizontal main pipes by simply opening the corresponding inspection port covers without breaking into the structure. Non-Destructive: Transforming previously complex and destructive inspection work into simple and standardized daily maintenance significantly reduces maintenance costs, time, and damage to the building structure. Visual Inspection: The inspection port can also serve as an observation hole, facilitating quick location of blockages and assessment of their nature.

[0026] Systematic integration and functional synergy: This utility model is not a simple superposition of functions, but an original design from a systems engineering perspective. It perfectly combines the core function of "odor prevention" with the maintenance requirement of "two-way inspection" on the same physical structure. The two functions do not interfere with each other and support each other (the water seal is located below the inspection port, ensuring that the inspection port is always in the gas phase space), achieving a technical effect of 1+1>2.

[0027] Clearly defined and precisely applied: This utility model explicitly defines its application scenario as the end of the "building drainage main riser," which is clearly distinguished from the water traps (S-bends / P-bends) under the sanitary fixtures of individual households in terms of system hierarchy and functional positioning. As a key infrastructure of the building's public drainage system, it solves the system-wide odor pollution and main pipe blockage problems that cannot be addressed by individual household water traps.

[0028] Enhancing system reliability and resilience: By pre-setting efficient and convenient maintenance channels, it is ensured that the building's main drainage network can be quickly restored in the event of an unexpected blockage, reducing the time and scope of the failure's impact, thereby improving the reliability of the entire building's drainage system and its ability to respond to emergencies (i.e., resilience).

[0029] Simple structure and easy to promote: The V-shaped conversion elbow has a clear structural principle, mature manufacturing process, and installation method compatible with traditional pipe fittings. It is easy to promote and apply in new construction and renovation projects, and has significant economic and social benefits.

[0030] In summary, this utility model, through its unique V-shaped water seal structure and integrated design of bidirectional inspection ports, successfully solves the key technical problem that has long plagued the field of building drainage, and provides a highly efficient, reliable, and easy-to-maintain system terminal solution. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0032] Reference numerals: 1. V-shaped bend; 11. Riser connection port; 12. Horizontal main pipe connection port; 13. U-shaped bend; 14. Water seal; 2. Riser side cleaning and maintenance port; 3. Horizontal main pipe side cleaning and maintenance port. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] This utility model discloses a V-shaped conversion elbow for odor prevention and maintenance of building drainage main risers. It is an independent pipe fitting that is integrally formed or assembled in sections, and is specifically used to connect the end of the drainage main riser located at the bottom of the building to the beginning of the horizontal main pipe going out of the house.

[0037] The V-shaped transition elbow includes a V-shaped bend body 1 with a structural water seal 14. The V-shaped bend body 1 has a vertically upward-facing riser connection port 11 for sealing connection to the main building drainage riser from above; a horizontal or near-horizontal outward-facing horizontal trunk line connection port 12 for sealing connection to the horizontal trunk line leading to the exterior of the building; and a U-shaped bend 13 connecting the riser connection port 11 and the horizontal trunk line connection port 12. The bottom of the U-shaped bend 13 naturally forms a groove for water accumulation, which holds water under normal use, thereby forming a permanent water seal 14 barrier between the drainage riser and the horizontal trunk line.

[0038] The V-shaped transition elbow also includes a riser side cleaning and maintenance port 2 and a horizontal main pipe side cleaning and maintenance port 3.

[0039] The riser side cleaning and maintenance port 2 is located on the V-shaped bend body 1, near the riser connection port 11, and its opening centerline is above the design water level line of the water seal 14 of the U-shaped bend 13. This riser side cleaning and maintenance port 2 is used to provide a passage for exploration, dredging and maintenance of the upstream direction of the main drainage riser.

[0040] The horizontal main pipe side cleaning and maintenance port 3 is opened on the V-shaped bend body 1, near the horizontal main pipe connection port 12, and its opening center line is also located above the design water level line of the water seal 14 of the U-shaped bend 13. This horizontal main pipe side cleaning and maintenance port 3 is used to provide a channel for exploration, dredging and maintenance of the downstream direction of the horizontal main pipe.

[0041] Furthermore, the V-shaped bend body 1 is made of corrosion-resistant, high-strength engineering plastics (such as PVC-U, PP, ABS), stainless steel, or ductile iron, with a smooth inner wall and good hydraulic conditions.

[0042] Furthermore, both the riser-side cleaning and maintenance port 2 and the horizontal main pipe-side cleaning and maintenance port 3 are equipped with openable sealing covers. The sealing covers are reliably sealed to the ports on the pipe body via threaded connections, snap-fit ​​connections, flange bolt connections, or quick-locking mechanisms. An elastic sealing ring is provided between the sealing cover and the port to ensure a tight seal when closed, preventing leakage of sewage and odors.

[0043] Furthermore, the angle between the central axis of the riser side cleaning and inspection port 2 and the vertical direction is between 0 degrees and 45 degrees, preferably vertically upward or slightly inclined, so as to facilitate the smooth entry of the cleaning tool into the riser and upward operation.

[0044] Furthermore, the angle between the central axis of the horizontal main pipe side cleaning and inspection port 3 and the horizontal direction is between 0 degrees and 30 degrees, preferably horizontal or slightly inclined downward, so as to facilitate the entry of the unblocking tool into the horizontal main pipe and outward operation.

[0045] Furthermore, the bending radius of the U-shaped bend 13 has been optimized to ensure smooth drainage, prevent solid debris from accumulating, and ensure an effective water seal depth 14. The water seal depth 14 (referring to the vertical height between the highest water level of the water seal 14 and the bottom of the water seal 14 outlet) is not less than 50mm to meet the requirements of relevant building codes for the water seal depth 14.

[0046] Furthermore, the V-shaped bend body 1 may also be equipped with a water seal 14 observation mirror or transparent observation window, located in a position that facilitates observation of the water level in the U-shaped bend 13, so as to visually check the status of the water seal 14 during daily maintenance.

[0047] Furthermore, the V-shaped bend body 1 is equipped with standardized pipe interfaces, such as sockets, flanges, or threaded interfaces, at its top riser connection port 11 and side horizontal trunk pipe connection port 12, so as to facilitate convenient and reliable sealing connection with existing drainage risers and horizontal trunk pipes of various materials.

[0048] Furthermore, for large buildings or drainage systems with high flow rates, the V-shaped transition elbow can be designed as a box structure, with the V-shaped bend body 1 having a larger cross-sectional dimension than the connecting pipe, in order to play a certain role in buffering and sedimentation, while facilitating internal operations.

[0049] Example 1:

[0050] Please see Figure 1 This utility model provides a V-shaped conversion elbow for odor prevention and maintenance of building drainage main risers. Its core design concept is to achieve two major functions at the same time through a proprietary pipe fitting structure: permanent water seal odor prevention and convenient two-way maintenance.

[0051] See Figure 1 The main body of the V-shaped transition elbow is a V-shaped bend 1. This bend 1 can be made of PVC-U through one-time injection molding or welded from stainless steel sections. The upper end of the bend 1 is a riser connection port 11, designed as a standard DN110 or DN160 socket, used to connect to the main building drainage riser from above. The other end of the bend 1 is a horizontal main pipe connection port 12, also designed as a standard interface, used to connect to the horizontal main pipe exiting the building. All connections are sealed with rubber sealing rings. Between the riser connection port 11 and the horizontal main pipe connection port 12 is a downward-curving U-shaped bend 13. When the drainage system is in normal use, some water will naturally accumulate at the bottom of the U-shaped bend 13, forming a water seal 14. The depth H of this water seal 14 is designed to be no less than 50mm to ensure an effective seal.

[0052] See Figure 1Two key cleaning and maintenance ports are provided on the V-shaped bend body 1. The riser-side cleaning and maintenance port 2 is located on the side wall near the riser connection port 11, with its axis essentially vertically upward. The horizontal main pipe-side cleaning and maintenance port 3 is located on the side wall near the horizontal main pipe connection port 12, with its axis essentially horizontally outward. The opening positions of both ports 2 and 3 are significantly higher than the design water level of the water seal 14, ensuring that under normal conditions, the interior of the maintenance port is a gas phase space and will not be flooded by sewage. Each maintenance port is equipped with a threaded sealing cap with a handle. An O-ring is embedded between the sealing cap and the pipe body interface; tightening it ensures a seal.

[0053] The typical installation location of this utility model is on the ground floor of a building (such as a basement, pipe floor, or dedicated pipe shaft), at the connection point between the main drainage riser and the horizontal main pipe before exiting the building. During installation, the lower end of the main drainage riser is inserted into or connected to the riser connection port 11 of the V-shaped bend, and the beginning end of the exiting horizontal main pipe is connected to the horizontal main pipe connection port 12 of the V-shaped bend. After installation, water is supplied to the system, and the water seal 14 is automatically formed.

[0054] Its working principle and maintenance process are as follows:

[0055] Odor prevention: Water seal 14 acts as an invisible barrier, always present between the drainage riser and the horizontal main pipe. Regardless of whether the pressure inside the riser is negative or positive, water seal 14 effectively prevents gas in the sewer from flowing back into the building's internal drainage system through the horizontal main pipe, thus protecting the relevant pipes on the ground floor and even the entire building from odor pollution.

[0056] Riser-side inspection procedure: When a blockage is suspected or confirmed to occur in the main drainage riser 4 upstream of the V-shaped bend, maintenance personnel can unscrew the sealing cap of the riser-side cleaning and inspection port 2. Then, insert a cleaning tool (such as a pipe cleaning machine) into this port and move upwards into the riser to perform cleaning or inspection work.

[0057] Maintenance procedures on the horizontal main pipe side: When a blockage is suspected or confirmed to occur in the outlet horizontal main pipe downstream of the V-shaped bend, maintenance personnel can unscrew the sealing cap of the horizontal main pipe side cleaning and maintenance port 3. Then, the unblocking tool can be inserted through this port to enter the interior of the horizontal main pipe for unblocking or inspection.

[0058] Through the above specific embodiments, this utility model transforms a pipe connection point that was originally single-function and prone to problems into a key system node that is fully functional, reliable in performance, and easy to maintain, thus achieving a significant improvement in the terminal technology of the drainage system.

[0059] The implementation principle of this utility model is as follows: This utility model discloses a V-shaped conversion elbow for odor prevention and maintenance of building drainage main risers, relating to the field of building water supply and drainage technology. The conversion elbow includes a V-shaped bend body 1, on which a vertical riser connection port 11 and a horizontal trunk pipe connection port 12 are provided, connected by a U-shaped bend 13, with a structural water seal 14 formed at the bottom of the U-shaped bend 13. Near the riser connection port 11 and the horizontal trunk pipe connection port 12, above the water level line of the water seal 14, a riser-side cleaning and maintenance port 2 and a horizontal trunk pipe-side cleaning and maintenance port 3 are respectively opened. This utility model achieves permanent and effective odor prevention through the V-shaped structure, isolating sewer odors; through the bidirectional maintenance ports, convenient dredging and inspection can be carried out upstream of the drainage riser and downstream of the exit horizontal trunk pipe without damaging the structure. It integrates odor prevention and bidirectional maintenance functions, effectively solving the problems of odor backflow and inconvenient maintenance in traditional connection methods, significantly improving the terminal performance and maintainability of the building drainage system.

[0060] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A V-shaped transition elbow for odor prevention and maintenance of main drainage risers in buildings, characterized in that, It is a standalone fitting, including: A V-shaped bend (1) has a vertically upward-arranged riser connection port (11), a horizontal or inclined outward-arranged horizontal trunk connection port (12), and a U-shaped bend (13) connecting the two, the bottom of which forms a groove for accumulating water to form a water seal (14). A riser side cleaning and maintenance port (2) is provided on the V-shaped bend body (1), located near the riser connection port (11) and its opening is located above the design water level line of the water seal (14); A horizontal main pipe side cleaning and maintenance port (3) is opened on the V-shaped bend (1), located near the horizontal main pipe connection port (12) and its opening is located above the design water level line of the water seal (14).

2. The V-shaped transition elbow for odor prevention and maintenance of building drainage main risers according to claim 1, characterized in that: Both the riser side cleaning and maintenance port (2) and the horizontal trunk pipe side cleaning and maintenance port (3) are equipped with an openable sealing cover, and a sealing ring is provided between the sealing cover and the pipe body interface.

3. A V-shaped transition elbow for odor prevention and maintenance of a building drainage main riser according to claim 2, characterized in that: The sealing cap is detachably sealed to the V-shaped bend (1) via threaded connection, snap-fit ​​connection, flange bolt connection or quick-locking mechanism.

4. A V-shaped transition elbow for odor prevention and maintenance of a building drainage main riser according to claim 1, characterized in that: The angle between the central axis of the riser side cleaning and maintenance port (2) and the vertical direction is between 0 degrees and 45 degrees; the angle between the central axis of the horizontal main pipe side cleaning and maintenance port (3) and the horizontal direction is between 0 degrees and 30 degrees.

5. A V-shaped transition elbow for odor prevention and maintenance of a building drainage main riser according to claim 1, characterized in that: The effective depth of the water seal (14) formed by the U-shaped bend (13) is not less than 50 mm.

6. A V-shaped transition elbow for odor prevention and maintenance of a building drainage main riser according to claim 1, characterized in that: The V-shaped bend (1) is made of engineering plastic, stainless steel or ductile iron.

7. A V-shaped transition elbow for odor prevention and maintenance of a building drainage main riser according to claim 1 or 6, characterized in that: The inner wall of the V-shaped bend (1) is smooth, and its riser connection port (11) and horizontal trunk connection port (12) are standardized pipe interfaces.

8. A V-shaped transition elbow for odor prevention and maintenance of a building drainage main riser according to claim 1, characterized in that: The V-shaped bend (1) is also provided with an observation mirror or transparent observation window for observing the water level of the water seal (14).

9. A V-shaped transition elbow for odor prevention and maintenance of a building drainage main riser according to claim 1, characterized in that: The V-shaped bend (1) is a box-type structure with a cross-sectional dimension larger than that of the pipe it connects to.

10. A V-shaped transition elbow for odor prevention and maintenance of a building drainage main riser according to any one of claims 1 to 9, characterized in that: This conversion elbow is specifically designed to connect the end of the building's main drainage riser to the beginning of the horizontal drain pipe, and is installed in inspection wells, pipe mezzanines, or equipment rooms at the bottom of the building.

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