Pollution-blocking and noise-reducing rotational flow three-way connector and building drainage system

Abstract

A vertical pipe connecting main body and a transverse pipe connecting main body are arranged, a first fluid channel is close to a first input port, and a first spiral flow guide structure is formed on the surface of the inner wall, higher than the transverse pipe connecting main body, of the first fluid channel; the first fluid channel is close to the first output port, and a second spiral flow guide structure is arranged on the inner wall surface, lower than the transverse pipe connecting body, of the first fluid channel. The spiral flow guide structure is designed in the vertical pipe connecting body, pollutants or solid particles are blocked, water flow is ingeniously guided to rotate and fall down along the pipe wall, a stable air column is formed in the center of a pipeline, direct collision between the water flow and the pipe wall is effectively reduced, and noise is reduced. Meanwhile, the first spiral flow guide structure and the second spiral flow guide structure are designed at the upper position and the lower position of the first fluid channel, so that fluid can smoothly flow into the lower vertical pipe from the upper vertical pipe, and the overall drainage efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage structures, in particular to a sewage-blocking and noise-reducing swirl three-way joint and a building drainage system. Background Technique

[0002] In the drainage system of modern buildings, the three-way joint is an important component connecting the upper and lower vertical pipes and the horizontal drainage pipe, and its design and performance have a direct impact on drainage efficiency and noise control. The traditional three-way joint has a simple structure, resulting in complex flow of water in the joint during the drainage process. Multiple water flows collide with the pipe wall continuously when converging, especially when using common thin-walled PVC (Polyvinyl chloride) drainage pipes, this kind of collision will generate relatively large noise. In addition, the water flow interacts with the air flow in the pipe during the downward flow, further aggravating the noise problem.

[0003] To solve the above problems, some improved designs have begun to appear in related technologies, such as the PVC spiral sound-absorbing pipe with spiral ribs on the inner wall. This design guides the water flow to rotate and fall along the inner wall of the pipe through the spiral ribs, forming an unobstructed air column in the center of the pipe, thus reducing the noise to a certain extent. However, this improvement still has limitations in practical applications, especially the "water tongue flow" phenomenon is likely to occur at the connection between the vertical pipe and the horizontal branch pipe. This phenomenon will cut off the spiral water flow in the main vertical pipe, resulting in blocked drainage paths, weakening the sound-absorbing effect and drainage performance, and reducing the noise reduction ability of the overall system. Therefore, the existing swirl three-way designs still fail to completely solve the problems of drainage noise, particle pollutant control, and flow efficiency, and there is still a great need for further optimization design of the three-way joint. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a sewage-blocking and noise-reducing swirl three-way joint and a building drainage system, so as to at least solve the technical problem of drainage noise mentioned in the related technologies.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] In the first aspect of the present utility model, a pollution - resistant and noise - reducing swirl three - way joint is provided, which is applied to a building drainage system. The pollution - resistant and noise - reducing swirl three - way joint includes a vertical pipe connection body and a horizontal pipe connection body. The first input port of the vertical pipe connection body is used to connect with the upper vertical pipe of the building drainage system, and the first output port of the vertical pipe connection body is used to connect with the lower vertical pipe of the building drainage system. A first fluid channel is formed between the first input port and the first output port, and the first fluid channel is used for the fluid in the upper vertical pipe to flow from the first input port to the first output port. The second input port of the horizontal pipe connection body is used to connect with the horizontal pipe of the building drainage system, and the second output port of the horizontal pipe connection body is connected to the vertical pipe connection body. A second fluid channel is formed between the second input port and the second output port, and the second fluid channel communicates with the first fluid channel. The second fluid channel is used for the fluid in the horizontal pipe to flow from the second input port to the second output port. A first spiral guiding structure is formed on the inner wall surface of the first fluid channel near the first input port and at a height higher than that of the horizontal pipe connection body. A second spiral guiding structure is provided on the inner wall surface of the first fluid channel near the first output port and at a height lower than that of the horizontal pipe connection body.

[0007] In the second aspect of the present utility model, a building drainage system is provided, which includes an upper vertical pipe, a lower vertical pipe, a horizontal pipe, and the pollution - resistant and noise - reducing swirl three - way joint as described in the first aspect. The upper vertical pipe is connected to the first input port of the vertical pipe connection body of the pollution - resistant and noise - reducing swirl three - way joint, the lower vertical pipe is connected to the first output port of the vertical pipe connection body of the pollution - resistant and noise - reducing swirl three - way joint, and the horizontal pipe is connected to the second input port of the horizontal pipe connection body of the pollution - resistant and noise - reducing swirl three - way joint.

[0008] The anti-pollution and noise-reducing swirl three-way joint and building drainage system of the present utility model include a vertical pipe connection main body and a horizontal pipe connection main body. The first input port of the vertical pipe connection main body is used to connect with the upper vertical pipe of the building drainage system, and the first output port of the vertical pipe connection main body is used to connect with the lower vertical pipe of the building drainage system. A first fluid channel is formed between the first input port and the first output port, and the first fluid channel is used for the fluid in the upper vertical pipe to flow from the first input port to the first output port. The second input port of the horizontal pipe connection main body is used to connect with the horizontal pipe of the building drainage system, and the second output port of the horizontal pipe connection main body is connected to the vertical pipe connection main body. A second fluid channel is formed between the second input port and the second output port, and the second fluid channel communicates with the first fluid channel. The second fluid channel is used for the fluid in the horizontal pipe to flow from the second input port to the second output port. A first spiral guide structure is formed on the inner wall surface of the first fluid channel near the first input port and at a height higher than that of the horizontal pipe connection main body, and a second spiral guide structure is arranged on the inner wall surface of the first fluid channel near the first output port and at a height lower than that of the horizontal pipe connection main body. Based on the above technical solutions, the anti-pollution and noise-reducing swirl three-way joint of the present utility model blocks pollutants or solid particles by designing a spiral guide structure inside the vertical pipe connection main body, and cleverly guides the water flow to rotate and fall along the pipe wall, and forms a stable air column in the center of the pipe, thereby effectively reducing the direct collision between the water flow and the pipe wall and reducing the generation of noise. At the same time, the first spiral guide structure and the second spiral guide structure are designed at the upper and lower positions of the first fluid channel, so that the fluid can flow smoothly from the upper vertical pipe into the lower vertical pipe, and the water flow in the main vertical pipe will not be disturbed when flowing from the horizontal pipe into the vertical pipe, thereby improving the overall drainage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a three-dimensional schematic diagram of the anti-pollution and noise-reducing swirl three-way joint of the present utility model;

[0010] Figure 2 is an internal structure schematic diagram of the anti-pollution and noise-reducing swirl three-way joint of the present utility model;

[0011] Figure 3 is a top view of the anti-pollution and noise-reducing swirl three-way joint of the present utility model;

[0012] Figure 4 is a side view of the anti-pollution and noise-reducing swirl three-way joint of the present utility model;

[0013] Figure 5 is an internal structure schematic diagram of the upper half part area of the vertical pipe connection main body in the anti-pollution and noise-reducing swirl three-way joint of the present utility model;

[0014] Label description: Pollution-resistant and noise-reducing swirl three-way joint 1, vertical pipe connection main body 10, horizontal pipe connection main body 20, first fluid channel 30, first input port 101, first output port 102, second input port 201, second fluid channel 204, first spiral guide structure 55, second spiral guide structure 60, second fluid channel 204, confluence area 70, first guide thread 50, second guide thread 40, drainage tip 601, flow-blocking structure 80, upper arc 202, lower arc 203. Detailed implementation manners

[0015] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0016] It should be noted that related terms such as "first" and "second" can be used to describe various components, but these terms do not limit the components. These terms are only used to distinguish one component from another. For example, without departing from the scope of the present invention, the first component can be called the second component, and similarly, the second component can also be called the first component. The term "and / or" refers to any combination of one or more of the related items and the described items.

[0017] Please refer to Figure 1 and Figure 2 , this embodiment provides a pollution-resistant and noise-reducing swirl three-way joint 1, which at least includes a vertical pipe connection main body 10 and a horizontal pipe connection main body 20.

[0018] When the pollution-resistant and noise-reducing swirl three-way joint 1 is applied, it is generally installed in a building drainage system. Specifically: the first input port 101 of the vertical pipe connection main body 10 is used to connect with the upper vertical pipe of the building drainage system, the first output port 102 of the vertical pipe connection main body 10 is used to connect with the lower vertical pipe of the building drainage system, a first fluid channel 30 is formed between the first input port 101 and the first output port 102, and the first fluid channel 30 is used for the fluid in the upper vertical pipe to flow from the first input port 101 to the first output port 102.

[0019] In addition, the horizontal pipe connection body 20's second input port 201 is used to connect with the horizontal pipe of the building drainage system. The second output port (not shown in the figure) of the horizontal pipe connection body 20 is connected to the vertical pipe connection body 10. A second fluid channel 204 is formed between the second input port 201 and the second output port. The second fluid channel 204 communicates with the first fluid channel 30 and is perpendicular to it. The second fluid channel 204 is used for the fluid in the horizontal pipe to flow from the second input port 201 to the second output port. Among them, the fluid includes water from the building drainage system.

[0020] In this embodiment, a first spiral flow guiding structure 55 is formed on the inner wall surface of the first fluid channel 30 near the first input port 101 and at a height higher than that of the horizontal pipe connection body 20. A second spiral flow guiding structure 60 is provided on the inner wall surface of the first fluid channel 30 near the first output port 102 and at a height lower than that of the horizontal pipe connection body 20.

[0021] Among them, the horizontal pipe connection body 20 is connected to the middle of the vertical pipe connection body 10. The setting position of the first spiral flow guiding structure 55 is generally in the upper half area of the first fluid channel 30, and the setting position of the second spiral flow guiding structure 60 is generally in the lower half area of the first fluid channel 30. Then, in the vertical direction, the first spiral flow guiding structure 55 and the second spiral flow guiding structure 60 are respectively located above and below the second fluid channel 204.

[0022] Through the above embodiments, the anti-pollution and noise-reducing swirl three-way joint 1 effectively reduces the direct collision between the water flow and the pipe wall and reduces the generation of noise by cleverly guiding the water flow to rotate and fall along the pipe wall and forming a stable air column in the center of the pipe by designing a spiral flow guiding structure inside the vertical pipe connection body 10. At the same time, the first spiral flow guiding structure 55 and the second spiral flow guiding structure 60 are designed at the upper and lower positions of the first fluid channel 30, so that the fluid can flow smoothly from the upper vertical pipe into the lower vertical pipe, and the water flow in the main vertical pipe connection body 10 will not be disturbed when flowing from the horizontal pipe into the vertical pipe, thus improving the overall drainage efficiency.

[0023] The design of the present invention effectively solves the problem of noise generated by the collision of water flow with the pipe wall in the traditional drainage system, and is particularly suitable for places with high requirements for noise control such as high-rise buildings, residential buildings, and commercial complexes. In addition, through the clever design of the first spiral flow guiding structure 55 and the second spiral flow guiding structure 60, the noise reduction effect can be achieved while maintaining the drainage efficiency. The first spiral flow guiding structure 55 and the second spiral flow guiding structure 60 are respectively located in the upper and lower parts of the first fluid channel 30, so that the fluid in the upper and lower vertical pipes and the horizontal pipe can flow smoothly and avoid mutual interference, thus further improving the overall drainage efficiency and the stability of the system.

[0024] In some alternative embodiments of the present embodiment, both the riser connection body 10 and the horizontal pipe connection body 20 are of double-layer structure, and the cross-sections of the riser connection body 10 and the horizontal pipe connection body 20 are both circular or elliptical. Through the double-layer structure of the riser connection body 10 and the horizontal pipe connection body 20, the double-layer structure can reduce noise while ensuring the overall strength. In addition, the riser connection body 10 and the horizontal pipe connection body 20 are integrally formed by a preset manufacturing process, and the preset manufacturing process includes one or a combination of two or more of welding, casting, forging, plastic forming, and laser melting. Through the integrally formed manufacturing process and the pipe body design with different inner diameters, the joint not only has good noise reduction performance, but also further ensures the high strength and reliability of the joint.

[0025] In some alternative embodiments of the present embodiment, for the variable-diameter three-joint design, the design is as follows: the inner diameter of the riser connection body is different from the inner diameter of the horizontal pipe connection body; this unique design enables it to smoothly connect pipes of different sizes and provides a smooth fluid passage at the pipe turning point. This design not only ensures the continuity of fluid flow, but also effectively reduces the eddy current and turbulence generated by the fluid at the turning point, thereby reducing the resistance loss and improving the efficiency of fluid transmission.

[0026] In some alternative embodiments of the present embodiment, the first spiral flow guiding structure 55 includes a first flow guiding thread 50. The first thread starting point of the first flow guiding thread 50 is on the inner wall of the first fluid passage 30 near the first input port 101, and extends in the left-handed or right-handed rotation direction towards the direction of the first output port 102 to form a first thread ending point. Specifically, by arranging the first flow guiding thread 50 in the fluid passage, the fluid is effectively guided to flow along a predetermined path. The starting point of the first flow guiding thread 50 on the inner wall is near the first input port 101 and extends in a left-handed or right-handed spiral manner, gradually guiding the fluid to advance along the inner wall of the flow channel; the design of the spiral flow guiding is aimed at reducing flow disorder, skillfully guiding the water flow to rotate and fall along the pipe wall, and forming a stable air column in the center of the pipe, thereby effectively reducing the direct collision between the water flow and the pipe wall and reducing the generation of noise. In addition, the positions of the starting point and the ending point of the first flow guiding thread are precisely set and can be flexibly adjusted to achieve different flow guiding effects.

[0027] In an embodiment of the present embodiment, the first spiral flow guiding structure further includes a second flow guiding thread 40. The second thread starting point of the second flow guiding thread 40 is below the first thread ending point, and extends in the same rotation direction as the first flow guiding thread 50 towards the direction of the first output port 102 to form a second thread ending point; wherein, the sum of the radial lengths of the first flow guiding thread and the second flow guiding thread is less than the shortest distance between the first input port and the horizontal pipe connection body, and the pitch of the second flow guiding thread 40 is less than the pitch of the first flow guiding thread 50.

[0028] Specifically, in the first spiral flow guiding structure 55, the first flow guiding thread 50 and the second flow guiding thread 40 are arranged in sequence in the same rotation direction, guiding the fluid to flow in a specific direction through a continuous spiral path. The first flow guiding thread 50 starts guiding the fluid near the input port, and immediately below its termination point is the second flow guiding thread 40 with a smaller pitch, thus forming a continuous and hierarchical spiral channel. This structure utilizes the swirl effect and boundary layer control principle in fluid mechanics to stabilize the fluid flow, reduce turbulence and impact losses, and form a stable air column in the center of the pipeline, thereby effectively reducing the direct collision between the water flow and the pipe wall and reducing the generation of noise.

[0029] In addition, the design of the first flow guiding thread 50 and the second flow guiding thread 40 makes the sum of their radial lengths less than the shortest distance between the first input port 101 and the horizontal pipe connection main body 20. This design ensures that the flow guiding structure does not interfere with the flow path between the input port and the connection main body, and the threads extend in the same rotation direction, ensuring that the flow direction of the fluid is continuous and without sudden changes, thereby reducing energy loss and noise generation during the flow.

[0030] In another optional embodiment of the present embodiment, the first spiral flow guiding structure 55 further includes a second flow guiding thread 40. The second flow guiding thread 40 is arranged at intervals with the first flow guiding thread 50. The second thread starting point of the second flow guiding thread 40 is flush with the first thread starting point on the inner wall of the first fluid channel 30, and extends in the direction of the first output port 102 in the same rotation direction as the first flow guiding thread 50 to form a second thread termination point; wherein, the sum of the radial lengths of the first flow guiding thread and the second flow guiding thread is less than the shortest distance between the first input port and the horizontal pipe connection main body, and the pitch of the second flow guiding thread 40 is less than the pitch of the first flow guiding thread 50.

[0031] Specifically, the first flow guiding thread 50 and the second flow guiding thread 40 of the first spiral flow guiding structure 55 are arranged at intervals and start flush on the inner wall of the fluid channel, always guiding the fluid to flow in the same rotation direction through threads with different pitches. By controlling the flow direction and speed of the fluid, turbulence and turbulence are reduced, and a stable air column is formed in the center of the pipeline, thereby effectively reducing the direct collision between the water flow and the pipe wall and reducing the generation of noise.

[0032] Please refer to Figure 5, in an alternative embodiment of the present embodiment, the first spiral flow guiding structure 55 may be a multi-layer annular baffle disposed along the inner wall of the first fluid passage 30, and the multi-layer annular baffle is spirally distributed along the direction from the first input port 101 to the first output port 102; wherein, the flow guiding area of the annular baffle closer to the first input port 101 is larger. (For example, the flow guiding area of the annular baffle at the position labeled 551 is larger than the flow guiding area of the annular baffle at the position labeled 552)

[0033] Specifically, in the above embodiment, the design of the multi-layer annular baffle of the first spiral flow guiding structure 55 aims to optimize the flow path of the fluid. Since the annular baffle is spirally distributed along the inner wall of the first fluid passage 30, it can effectively guide the fluid to rotate and advance in a predetermined direction, thereby reducing turbulence and energy loss. The annular baffle closer to the first input port 101 has a larger flow guiding area, and this design helps to effectively divert and guide the fluid when it initially enters, preventing the fluid from forming too strong a flow rate or eddy current in the initial stage. At the same time, as the fluid gradually advances towards the first output port 102, the flow guiding area of the annular baffle gradually decreases, and this decreasing area design can control the speed and pressure change of the fluid, ensuring that the fluid flows out of the passage smoothly and orderly. That is to say, through this spiral flow guiding structure, the fluid can move more uniformly along the inner wall of the fluid passage, reducing the direct impact on the inner wall of the passage and effectively extending the service life of the passage. In addition, this structure can also avoid local accumulation and turbulence of the fluid in the passage, improving the stability and efficiency of the entire flow process, skillfully guiding the water flow to rotate and fall along the pipe wall, and forming a stable air column in the center of the pipe, thereby effectively reducing the direct collision between the water flow and the pipe wall and reducing the generation of noise.

[0034] Please refer to Figure 3 and Figure 4 , in another alternative embodiment of the present embodiment, the second spiral flow guiding structure 60 includes at least one layer of spiral blades, and the number of spiral blades in each layer is multiple and is spirally and evenly distributed on the inner wall of the first fluid passage 30.

[0035] Specifically, the second spiral flow guiding structure 60 adopts a design of multiple spiral blades, and these blades are spirally and evenly distributed on the inner wall of the first fluid passage 30 to form a multi-layer spiral structure. Thus, when fluid enters the horizontal pipe of the building drainage system and enters the confluence area 70 (the confluence area between the second fluid passage 204 and the first fluid passage 30) along the second fluid passage 204, the spiral blades guide the water flow from the second fluid passage 204 to the center of the first fluid passage 30, preventing the formation of a water tongue at the confluence of the riser pipe, ensuring the drainage capacity of the pipe, and avoiding the phenomenon that the spiral water flow of the main riser pipe is cut off due to the easy generation of water tongue flow at the connection between the riser pipe and the horizontal branch pipe.

[0036] In addition, the number of spiral vanes in each layer of the second spiral flow guiding structure 60 is multiple, and they are distributed on the inner wall of the first fluid channel 30 at uniform intervals; this distribution method ensures that the vanes can uniformly exert a guiding effect, enabling the fluid to be in a controlled state at all times when flowing through the channel. In addition, the superimposed design of multiple layers of spiral vanes further enhances the flow guiding effect, optimizing the flow state by adjusting the fluid direction and velocity multiple times. The number and angle of spiral vanes in each layer can be optimized according to specific fluid characteristics to achieve the best flow guiding effect.

[0037] In some alternative embodiments of the present embodiment, the spiral vanes are all configured with drainage tips 601, and the drainage tips 601 of the spiral vanes in each layer all point to the central region of the first fluid channel. Specifically, the design of the drainage tip 601 is based on the tip effect in fluid mechanics, and its function is to guide the fluid flow towards the center of the channel, thereby reducing the impact of the fluid on the pipe wall. The guiding effect of the tip on the fluid can concentrate the fluid flow path, reduce the formation of turbulent regions, and further reduce noise and energy loss by forming a stable swirl in the central region. That is to say, through the tip directivity and uniformly distributed structure of the spiral vanes, the fluid can be continuously and smoothly guided to the central region, thereby forming a stable rotational flow. This design not only optimizes the fluid flow path but also effectively reduces the friction and collision between the pipe wall and the fluid.

[0038] Please continue to refer to Figure 2 and Figure 4 , in some alternative embodiments of the present embodiment, the inner wall of the second fluid channel is provided with a plurality of uniformly distributed flow blocking structures 80 that protrude away from the inner wall of the second fluid channel. Specifically, the flow blocking structure 80 is inclined from the outside to the inside at the second input port, with a length of one-fifth of the inner diameter of the pipe, and is symmetrically arranged on both sides inside the pipe to reduce the flow velocity of the water flow at the riser, and reduce the force at the connection between the main riser and the horizontal branch pipe. That is to say, the key design of the flow blocking structure 80 lies in its protrusion and arrangement away from the inner wall, and this design enables the flow blocking structure to produce a uniform resistance effect on the fluid. The number and distribution density of the flow blocking structures can be adjusted according to actual needs to achieve precise control of the fluid flow state. The uniformly distributed flow blocking structures form a stable flow blocking field in the fluid channel, which can effectively reduce the formation of turbulence and provide sufficient flow guiding and flow blocking effects when the fluid contacts the inner wall, thereby optimizing the overall flow state of the fluid.

[0039] In some alternative embodiments of the present embodiment, the upper arc 202 and the lower arc 203 at the connection of the horizontal pipe connector 20 and the riser connector 10 are concentric circles, greatly improving the smoothness of the inner wall of the pipe fitting and reducing the flow resistance of the water flow.

[0040] In a second aspect of the present utility model, a building drainage system is provided, which includes an upper vertical pipe, a lower vertical pipe, a horizontal pipe, and a pollution-blocking and noise-reducing swirl three-way joint; the upper vertical pipe is connected to the first input port of the vertical pipe connection body of the pollution-blocking and noise-reducing swirl three-way joint, the lower vertical pipe is connected to the first output port of the vertical pipe connection body of the pollution-blocking and noise-reducing swirl three-way joint, and the horizontal pipe is connected to the second input port of the horizontal pipe connection body of the pollution-blocking and noise-reducing swirl three-way joint.

[0041] The pollution-blocking and noise-reducing swirl three-way joint and the building drainage system provided by the present utility model design a spiral flow guiding structure inside the vertical pipe connection body, which skillfully guides the water flow to rotate and fall along the pipe wall, and forms a stable air column in the center of the pipe, thereby effectively reducing the direct collision between the water flow and the pipe wall and reducing the generation of noise. At the same time, the first spiral flow guiding structure and the second spiral flow guiding structure are designed at the upper and lower positions of the first fluid channel, so that the fluid can smoothly flow from the upper vertical pipe into the lower vertical pipe, and the water flow in the main vertical pipe will not be disturbed when flowing from the horizontal pipe into the vertical pipe, thereby improving the overall drainage efficiency.

[0042] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the present utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modification or substitution of the utility model is also within the scope of the present utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principle of the present utility model should be covered within the scope of the present utility model.

Claims

1. A pollution-blocking and noise-reducing swirl tee joint, used in building drainage systems, characterized in that: The pollution-blocking and noise-reducing swirl three-way joint comprises a vertical pipe connection body and a horizontal pipe connection body; The first input port of the riser connection body is used to connect to the upper riser of the building drainage system, and the first output port of the riser connection body is used to connect to the lower riser of the building drainage system. A first fluid channel is formed between the first input port and the first output port, and the first fluid channel is used for the fluid in the upper riser to flow from the first input port to the first output port; The second input port of the horizontal pipe connecting body is used to connect to the horizontal pipe of the building drainage system, and the second output port of the horizontal pipe connecting body is connected to the vertical pipe connecting body. A second fluid channel is formed between the second input port and the second output port, and the second fluid channel is communicated with the first fluid channel. The second fluid channel is used for the fluid in the horizontal pipe to flow from the second input port to the second output port. A first spiral guide structure is formed on the inner wall surface of the first fluid channel close to the first input port and at a height higher than the cross-tube connecting body, and a second spiral guide structure is provided on the inner wall surface of the first fluid channel close to the first output port and at a height lower than the cross-tube connecting body.

2. The pollution-blocking and noise-reducing swirl three-way joint according to claim 1, characterized in that: The vertical pipe connection body and the horizontal pipe connection body are both double-layer structures, and the cross-sections of the vertical pipe connection body and the horizontal pipe connection body are both circular or elliptical.

3. The pollution-blocking and noise-reducing swirl three-way joint according to claim 2 is characterized in that: The vertical pipe connection body and the horizontal pipe connection body are integrally formed through a preset manufacturing process; The preset manufacturing process includes one or a combination of two or more of welding, casting, forging, plastic forming, and laser melting.

4. The pollution-blocking and noise-reducing swirl three-way joint according to claim 1, characterized in that: The first spiral guide structure includes a first guide thread, wherein a first thread starting point of the first guide thread is located on the inner wall of the first fluid channel close to the first input port, and extends toward the first output port in a left-handed or right-handed rotation direction to form a first thread ending point.

5. The pollution-blocking and noise-reducing swirl three-way joint according to claim 4 is characterized in that: The first spiral flow guiding structure further includes a second flow guiding thread, wherein a second thread starting point of the second flow guiding thread is located below a second thread ending point, and the second thread extending in the same rotation direction as the first flow guiding thread toward the direction of the first output port to form a second thread ending point; The sum of the radial length of the first flow-guiding thread and the radial length of the second flow-guiding thread is smaller than the shortest distance between the first input port and the cross-tube connecting body.

6. The pollution-blocking and noise-reducing swirl three-way joint according to claim 4, characterized in that: The first spiral flow-guiding structure further includes a second flow-guiding thread, the second flow-guiding thread is spaced apart from the first flow-guiding thread, a second thread starting point of the second flow-guiding thread is flush with the first thread starting point on the inner wall of the first fluid channel, and extends in the same rotation direction as the first flow-guiding thread in the direction of the first output port to form a second thread termination point; The sum of the radial length of the first flow-guiding thread and the radial length of the second flow-guiding thread is smaller than the shortest distance between the first input port and the cross-tube connecting body.

7. The pollution-blocking and noise-reducing swirl three-way joint according to claim 1, characterized in that: The second spiral flow guiding structure includes at least one layer of spiral blades, and each layer of spiral blades has a plurality of spiral blades which are uniformly distributed on the inner wall of the first fluid channel in a spiral manner.

8. The pollution-blocking and noise-reducing swirl three-way joint according to claim 7, characterized in that: The spiral blades are all provided with drainage tips, and the drainage tips of the spiral blades of each layer are all directed to the central area of ​​the first fluid channel.

9. The pollution-blocking and noise-reducing swirl three-way joint according to claim 1, characterized in that: The inner wall of the second fluid channel is provided with a plurality of evenly distributed flow-blocking structures protruding in a direction away from the inner wall of the second fluid channel.

10. A building drainage system, characterized in that: It comprises an upper riser, a lower riser, a cross pipe and the pollution-blocking, noise-reducing swirl three-way joint as claimed in any one of claims 1 to 9; the upper riser is connected to the first input port of the riser connection body of the pollution-blocking, noise-reducing swirl three-way joint, the lower riser is connected to the first output port of the riser connection body of the pollution-blocking, noise-reducing swirl three-way joint, and the cross pipe is connected to the second input port of the cross pipe connection body of the pollution-blocking, noise-reducing swirl three-way joint.

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