Large flow cyclone tee for single riser drainage system

Abstract

The application discloses a cyclone tee for a large-flow single riser drainage system, and mainly solves the problem that the existing cyclone and Sulto of the single riser drainage system cannot effectively apply to large drainage load or high instantaneous flow conditions. The cyclone tee comprises a multi-pass body, a socket for socketing a drainage riser fixed at a top water inlet of the multi-pass body; the multi-pass body comprises an equal-diameter part provided with a transverse water inlet, a reduced-diameter part connected to a bottom position of the equal-diameter part, and a guide plate provided on an inner edge surface of the reduced-diameter part and corresponding to the transverse water inlet and in a spiral shape. Through the combined action of the special structure defined by the tapering spiral flow channel, the single guide plate, the transverse water inlet spiral part, the inclined drainage part and the socket provided with a guide part, the technical problems of large air pressure fluctuation and limited drainage capacity of the traditional single riser system are solved.

Description

Technical Field

[0001] This invention relates to the field of water supply and drainage technology, specifically to a vortex tee for a high-flow single-pipe drainage system. Background Technology

[0002] In building drainage systems, risers are the core channels for the vertical collection and discharge of sewage from each floor. Traditional drainage systems often employ dual-riser systems (with separate drainage risers and dedicated venting risers) or even triple-riser systems. Independent venting lines balance the air pressure within the pipes during drainage, ensuring smooth flow and preventing water seal disruption. However, these systems suffer from drawbacks such as high pipe material consumption, large building space requirements, complex pipe installation, and high overall cost. Therefore, single-riser drainage systems have emerged. These systems use only one drainage riser, simultaneously handling sewage discharge and airflow balancing, offering advantages such as simplified structure and savings in pipe materials and space.

[0003] However, in a single riser system, when sewage discharged from the upper-floor residents falls through the riser, it compresses the air in the lower pipe like a piston, resulting in positive pressure in the lower part of the pipe. At the same time, the local negative pressure suction effect created by the water flow in the upper floor makes it easier for negative pressure to be generated in the upper part of the pipe. This frequent fluctuation of positive and negative pressure will seriously interfere with the normal discharge of water in the horizontal branch pipes of each floor, and the violent air pressure fluctuations will hinder the free fall of sewage in the riser, making it difficult to increase the actual drainage flow of the riser.

[0004] To address the aforementioned issues, the industry typically installs cyclones or suvius (air-water mixing joints for building drainage systems) at key nodes in single-rise systems. These guide the incoming water to swirl tangentially down the inner wall of the riser, reducing the impact of the water flow on the central air column and promoting a stable air-water mixture, thus stabilizing the air pressure to some extent. However, through long-term practice and research, the inventors have found that existing conventional cyclone tees and suvius, in practical applications, especially under conditions of high drainage load or high instantaneous flow, still exhibit insufficient flow stabilization and pressure reduction effects, making them unsuitable for high-flow-rate single-rise drainage systems.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, this disclosure provides a vortex tee for a high-flow single-pipe drainage system, which mainly solves the problem that existing vortex generators and sovittos for single-pipe drainage systems cannot be effectively applied to high drainage loads or high instantaneous flow conditions.

[0007] According to one aspect of this disclosure, a vortex tee for a high-flow-rate single-pipe drainage system is provided, comprising a multi-way body and a socket fixed at the top inlet of the multi-way body for receiving a drainage riser; the multi-way body includes a constant-diameter section with a transverse inlet, a reduced-diameter section connected to the bottom of the constant-diameter section, and a spiral guide plate located on the inner edge of the reduced-diameter section corresponding to the transverse inlet; the transverse inlet includes a spiral section with the same spiral direction as the guide plate, and an oblique guide section located on the side opposite to the spiral direction of the spiral section for guiding the water flow in the transverse inlet toward the spiral section; the width of the guide plate gradually decreases along the reduced-diameter direction of the reduced-diameter section, and the angle between the guide plate and the inner edge of the reduced-diameter section gradually increases along the reduced-diameter direction of the reduced-diameter section, with the initial angle being an acute angle; the socket includes an arc-shaped guide section for guiding the water flow direction, and the water outlet direction of the guide section is correspondingly arranged toward the transverse inlet direction.

[0008] In some embodiments of this disclosure, a plurality of water-retaining rings are provided on the outer edge surface at the junction of the equal diameter portion and the reduced diameter portion for pre-embedding into the floor slab to prevent water seepage; the lower part of the reduced diameter portion is provided with reinforcing ribs for installing fire-resistant rings.

[0009] In some embodiments of this disclosure, the lateral inlet opening at the equal diameter section is projected onto a horizontal plane perpendicular to the axis of the multi-channel body, within the projection range of the corresponding guide plate on that horizontal plane.

[0010] In some embodiments of this disclosure, the pitch of the helical portion is smaller than the pitch of the guide plate.

[0011] In some embodiments of this disclosure, the helix angle of the spiral portion is 35° to 45°, and the rotation angle of the guide plate along the axis of the multi-pass body is 160° to 180°.

[0012] In some embodiments of this disclosure, the angle between the drainage plane of the oblique drainage section and the inlet center line of the spiral section is 0° to 10°.

[0013] In some embodiments of this disclosure, the angle between the plane where the exit of the guide portion is located and the horizontal plane perpendicular to the axis of the multi-pass body is 30° to 40°.

[0014] In some embodiments of this disclosure, the socket further includes a fixing part for fixed connection with the equal diameter portion, the fixing part having a boss at the top outer edge, and the equal diameter portion having a positioning shoulder at the top inner edge that matches the boss and is used to limit the insertion depth of the socket.

[0015] In some embodiments of this disclosure, the inner diameter of the guide portion matches the inner diameter of the drainage riser, and a limiting shoulder is formed at the connection position between the guide portion and the fixing portion to limit the insertion depth of the drainage riser.

[0016] One or more technical solutions provided in this application embodiment have at least one of the following technical effects or advantages: Through the indispensable cooperation of the specially structured tapered spiral flow channel, single guide plate, transverse inlet spiral part and oblique drainage part, and the socket with guide part, the technical problems of large air pressure fluctuation and limited drainage capacity of traditional single riser systems are solved. Based on the socket, the water inlet of the drainage riser is guided, reducing the initial kinetic energy in the water flow and the adverse effects on the air core; at the same time, based on the special pre-swirl angle of the transverse inlet and the special angled drainage part, the water flow is smoothly guided, smoothly cuts into the guide plate and continues to flow with low resistance against the wall in the narrow diameter structure; thus, the upper water flow and the transverse water flow form an orderly confluence, which is conducive to increasing the drainage flow of the single riser system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the exploded structure of a vortex tee in one embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the structure of a multi-channel body in one embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the structure of a multi-channel body from another perspective in one embodiment of this application.

[0020] Figure 4 This is a cross-sectional schematic diagram of a multi-channel body structure in one embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the socket structure in one embodiment of this application.

[0022] Figure 6 This is a schematic diagram of the assembly of a vortex tee in another embodiment of this application.

[0023] Figure 7 This is the actual test result of a single-pipe drainage system with a vortex tee in one embodiment of this application.

[0024] In the above figures, 1 is the multi-channel body, 11 is the equal diameter section, 12 is the reduced diameter section, 13 is the transverse water inlet, 131 is the spiral section, 132 is the oblique flow guide section, 14 is the guide plate, 2 is the socket, 21 is the guide section, 22 is the fixing section, 3 is the wing water ring, and 4 is the reinforcing rib. Detailed Implementation

[0025] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0026] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] To address the issue that existing cyclone separators and sovitas in single-pipe drainage systems are not effectively suited for high drainage loads or high instantaneous flow conditions, this example discloses a cyclone tee for high-flow-rate single-pipe drainage systems. In this example, a cyclone tee is used... Figure 1 Taking the vortex tee shown as an example, it includes a multi-way body 1 and a socket 2 fixed at the water inlet at the top of the multi-way body 1.

[0028] In this embodiment, see Figures 1 to 3 The multi-way body 1 includes a constant-diameter section 11 with a diameter larger than that of a single riser in a single-pipe drainage system. A reducing section 12 is connected to the bottom of this constant-diameter section 11, thereby gradually reducing the diameter of the constant-diameter section 11 to match the diameter of the drainage riser, thus facilitating the connection between the vortex tee and the drainage riser. See also... Figures 1 to 3 The side of the equal diameter section 11 of the multi-port body is provided with a transverse inlet 13 for connecting the transverse drainage branch pipe. Water in the transverse drainage branch pipe enters the interior of the multi-port body 1 through the transverse inlet 13.

[0029] Considering that in a single riser system, the vortex tee also needs to function as an air vent during drainage, existing technologies often employ multiple spiral guide plates inside the vortex tube to forcibly transform the impacting water flow into a spiral, wall-adhering flow along the pipe wall. As the spiral water flow rotates and falls along the pipe wall, a relatively stable low-pressure air column (air core) forms in the center of the riser system, thus achieving air venting. Through long-term practice, the inventors have found that those skilled in the art generally believe that multiple guide plates are more beneficial for the flow guidance of the vortex tee. Therefore, from a static perspective, a greater number of guide plates means a larger contact area with the water flow, allowing for a faster and more forceful correction of turbulent water flow into a vortex state, quickly achieving a change in the flow direction. Furthermore, by using multiple guide plates, the water flow can adhere more evenly to the pipe wall, avoiding unilateral wear or single-point stress. Even if one guide plate fails due to obstruction, the others can still function normally, thus serving as a redundant design.

[0030] However, through practical research, the inventors discovered that while the existing design with multiple guide vanes can intuitively achieve rapid changes in water flow, thus increasing the drainage flow of the hydrocyclone, in reality, multiple guide vanes mechanically divide the continuous falling water flow into several independent spiral streams. During their downward movement, especially at high drainage flow rates, these spiral streams risk interfering with each other at their flow boundaries or generating severe secondary turbulence upon re-merging downstream. This internal turbulence disrupts the stable air core in the center of the riser, exacerbating air-water mixing and failing to effectively suppress air pressure fluctuations, which is detrimental to drainage in high-flow-rate scenarios. Furthermore, on the one hand, the multiple guide vanes increase the wall area in contact with the water flow, significantly increasing the frictional resistance along the flow path; on the other hand, the narrow channels formed between the multiple guide vanes create multiple local diameter reductions, resulting in a series of head losses that limit the flow rate increase in high-flow-rate scenarios. In addition, multiple deflectors create more sharp edges and dead zones, making it easy for hair, fibers and other debris to get stuck. After long-term use, some flow channels may become blocked, reducing the effective flow surface and drastically decreasing drainage capacity.

[0031] Therefore, in this embodiment, a special single-spiral guide vane design with continuously varying width and corresponding included angle is adopted. For details, see... Figure 4A spiral-shaped guide plate 14 is provided on the inner edge of the reduced diameter section 12. In this embodiment, the width of the guide plate 14 gradually decreases along the spiral direction of the reduced diameter section 12. Thus, the guide plate 14, with its gradually decreasing width, and the pipe wall of the reduced diameter section 12 together form a spiral flow channel with a continuous and smoothly contracting cross-sectional area. According to the law of fluid continuity, under a constant flow rate, the reduction in the effective area of ​​the flow channel will inevitably lead to an increase in flow velocity. Therefore, the water flow is smoothly and forcibly accelerated when passing through this section. In addition, in this embodiment, the angle between the guide plate 14 and the inner edge of the reduced diameter section 12 is not fixed, but gradually increases along the spiral direction of the reduced diameter section 12. Furthermore, the angle between the starting end of the guide plate 14 and the inner edge of the reduced diameter section 12 is an acute angle. Therefore, the acute angle setting at the starting end ensures that the initial section of the guide plate can guide the water flow with a small angle of attack, thereby reducing initial disturbance and energy loss. Furthermore, as the water flows, the angle between the guide plate 14 and the inner edge of the reduced diameter section 12 gradually increases, thus matching the gradually increasing water flow velocity. Specifically, traditional guide plates with equal width and equal angle tend to cause local flow separation or eddies, resulting in significant local resistance. In contrast, the gradually changing structure guide plate in this example effectively guides the water flow into a streamlined and non-separating accelerated flow. The higher the water flow velocity, the greater the inertia of the water flow, and thus a larger guiding angle can provide sufficient normal force to maintain the water flow's tendency to rotate along the wall, maximizing the conversion of the water's gravitational potential energy into the kinetic energy of the water's rotation along the wall, preventing the water flow from detaching from the inner wall of the multi-channel body 1 and shooting towards the core, thereby destroying the established air core. Additionally, in this embodiment, see... Figure 4 The starting end of the guide plate 14 is also set in a smooth arc shape, which ensures that the water can smoothly transition and adhere to the curved surface of the guide plate compared to sharp edges, and then start the spiral motion, thus guiding the water flow.

[0032] In this embodiment, a transverse water inlet 13 is provided on the side of the multi-channel body 1. See also Figures 1 to 3 In this example, in order to enable the vortex tee to effectively adapt to high flow rate scenarios, the transverse inlet 13 includes a spiral part 131 and an oblique drainage part 132.

[0033] Specifically, the spiral direction of the spiral section 131 is the same as that of the guide plate 14. In this example, the opening of the transverse inlet at the equal diameter section is within the projection line of the guide plate on the horizontal plane perpendicular to the axis of the multi-way body. Thus, by setting the spiral section 131, the water flow from the transverse inlet branch pipe into the vortex tee is prevented from directly impacting the opposite pipe wall, thereby avoiding problems such as energy loss, noise, and damage to the central air core. After the water enters the vortex tee from the transverse inlet 13 in the transverse inlet branch pipe, it gains a tangential velocity around its axis at the spiral guide channel of the spiral section 131. Due to the inertia of the water flow itself, it moves closely along the curved surface of the spiral section. Since the corresponding projection ranges of the two overlap, the water flow is released from the end of the spiral section 131 and swirls along the pipe wall of the equal diameter section. It then meets the arc-shaped upstream surface of the guide plate at its starting end. At this point, the rotational momentum of the water flow is smoothly received by the guide plate, and it continues to flow spirally downward along the curved surface of the guide plate. Thus, by guiding the water through the spiral section 131, the flow direction is adapted to the angle of the guide plate before contacting it, which greatly reduces the generation of impact, splashing, and turbulence at the inlet. This achieves a low-disturbance and high-efficiency transition of water flow from the transverse branch pipe to the vortex tee.

[0034] In addition, see Figure 2In this embodiment, the oblique guide section 132 is positioned at the inlet of the transverse inlet, facing the spiral direction of the water flow into the spiral section, to guide the water flow within the transverse inlet toward the spiral section. In this embodiment, the angle between the guide plane of the oblique guide section 132 and the inlet centerline of the spiral section 131 is 0° to 10°. This allows the oblique guide section 132 to guide and correct the direction of the water entering the vortex tee through the transverse inlet, making the water flow direction more biased toward the inlet tangent of the spiral section. This allows the water flow to more effectively contact the spiral surface of the spiral section and begin moving along the spiral surface. Furthermore, the aforementioned angle range design maximizes the water flow guidance effect while reducing kinetic energy loss due to impact. Additionally, in this embodiment, the pitch of the spiral section 131 is smaller than the pitch of the guide plate 14, the spiral helix angle of the spiral section is set within the range of 35° to 45°, and the rotation angle of the guide plate along the axial direction of the multi-way body is set within the range of 160° to 180°. This allows the spiral section 131 to apply a large rotation angle change to the water flow within a short axial distance, enabling the water to quickly and efficiently swirl within the limited space of the spiral section 131, giving it a strong tangential velocity component. This ensures that the water flow gains sufficient rotational momentum after leaving the spiral section 131, allowing it to move closely along the curved surface of the pipe wall and be captured by the guide plate. At the same time, the relatively larger pitch and larger axial rotation angle of the guide plate 14 provide a sufficiently long and continuous guiding surface for the water flow, allowing the spiral flow state of the water to fully develop and stabilize, thereby forming a stable and uniform gas-water two-phase flow structure.

[0035] However, the inventors discovered through actual testing that the aforementioned structural design of the multi-way body alone could not significantly increase the drainage flow rate of the vortex tee. Further details can be found in [link to documentation]. Figure 1 In this embodiment, the vortex tee also includes a socket 2 fixed at the top of the multi-way body 1 for inserting the drainage riser. See details below. Figure 5In this example, the socket 2 specifically includes a guide section 21 with an arc-shaped bend structure. This guide section 21 guides the nearly vertically downward water flow from the drainage riser, forcibly and smoothly changing its flow direction through a smooth, continuous curved surface. Furthermore, in this example, the outlet of the guide section 21 is positioned opposite the transverse inlet. This actively avoids the impact zone of the transverse water flow entering at the transverse inlet by guiding the incoming water to the opposite side of the transverse inlet. Simultaneously, the vertical water flow from the upper riser has significant kinetic energy, which compresses the lower air, causing positive pressure fluctuations. In this example, by using the socket 2 and its guide section 21 to change the water flow direction and guide the impact, this vertical kinetic energy is consumed and dispersed through contact between the water flow and the pipe wall. This allows the water flow to enter the flow field dominated by the guide plate at a lower speed and in a more dispersed state, thereby reducing the adverse effects of the water flow on the air core inside the tee. Furthermore, in this embodiment, the angle between the plane where the outlet of the guide section 21 is located and the horizontal plane perpendicular to the axis of the multi-channel body 1 is specifically set within the range of 30° to 40°, so that the water flow from the upper riser can rush towards the pipe wall of the equal diameter section of the multi-channel body at a suitable tilt angle, so that the water flow has a tendency to stick to the wall before contacting the guide plate, thereby reducing interference to the central air core area.

[0036] In this embodiment, to achieve a fixed connection at a specific position and angle between the socket 2 and the multi-port body 1, a friction welding machine is used to perform rotary friction welding between the socket 1 and the multi-port body 1. Furthermore, based on the tooling positioning of the friction welding machine, the guide portion of the socket is positioned towards the opposite side of the transverse inlet. For details, see [link to documentation]. Figure 5 In addition to the guide portion 21, the socket 2 also includes a fixing portion 22. The outer diameter of the fixing portion 22 matches the inner diameter of the equal-diameter portion of the multi-port body 1. The fixing portion 22 is then inserted into the top of the multi-port body 1 and fixed using a friction welding machine. Furthermore, to prevent the socket 2 from sinking into the multi-port body 1 in case of welding failure or loosening, a boss is provided at the top outer edge of the fixing portion 22 in this example. Correspondingly, a positioning shoulder matching the boss is provided at the top inner edge of the equal-diameter portion of the multi-port body. Thus, the socket is limited by the contact between the boss at the socket and the positioning shoulder at the multi-port body.

[0037] Furthermore, in this example, the connection between the socket 2 and the drainage riser adopts a sealing cap-type connection structure. In other embodiments, the port of the socket used to connect the drainage riser can be a socket or other interface type. In this example, during installation, since the sealing ring and cap are already fixed inside the socket, the drainage riser only needs to be inserted into the socket 2 to complete the installation. In order to limit the insertion depth of the drainage riser, in this embodiment, the inner diameter of the guide part 21 is the same as the inner diameter of the drainage riser, and a limiting shoulder is formed at the connection position between the guide part and the fixing part of the socket using the diameter difference between the two. Thus, the depth and position of the drainage riser inserted into the socket are limited by the contact between the limiting shoulder and the end of the plastering riser.

[0038] See Figures 1 to 3 Considering the actual installation requirements of the vortex tee, in this embodiment, a water-retaining ring 3 with several annular protrusions is provided on the outer edge surface at the junction of the equal-diameter section and the reduced-diameter section of the vortex body. This allows the water-retaining ring to be tightly wrapped by concrete after the vortex tee is embedded in the building floor slab, forming multiple physical barriers. This effectively prevents water from the upper layer from seeping down to the lower layer along the gap between the pipe fitting's outer wall and the floor slab. It also increases the contact area and interlocking force between the pipe fitting and the concrete, improving the stability of the piping system within the building structure. Furthermore, in this example, a reinforcing structure with several annular or strip-shaped protrusions is provided on the lower outer edge surface of the reduced-diameter section of the vortex body as a reinforcing rib 4. This enhances the local rigidity and compressive strength of the vortex body while reliably supporting and fixing the fire-resistant ring, preventing displacement or detachment during long-term use or in the event of a fire.

[0039] In this embodiment, the horizontal inlet and the outlet at the bottom of the multi-port body use a flange connection. In other embodiments, the horizontal inlet and the outlet at the bottom of the multi-port body use a threaded socket, a fixed cap, or a heat-fused socket. For example, in some embodiments, see... Figure 6 Both the horizontal water inlet and the water inlet at the bottom of the multi-port body are socket-type, and in this example, the socket used to connect to the drainage riser is also a socket-type. Furthermore, in this embodiment, considering the need for pre-embedded components in floors or walls in some construction scenarios, to facilitate the connection between the socket and the drainage riser, see [reference needed]. Figure 6 In this example, the socket used to connect the drainage riser has a neck of a certain length along the axial direction of the vortex tee, which is used for burying to the floor.

[0040] To verify the adaptability of the specific structural form of the vortex tee proposed in this embodiment under high flow rate scenarios, this example also tested the vortex tee proposed in this application according to the instantaneous flow method in section 4.2 of CJJ / T 245-2016 "Standard for Testing the Drainage Capacity of Riser Pipes in Residential Domestic Drainage Systems". The test results are shown in [link to test results]. Figure 7As shown, the maximum drainage capacity of the single-pipe system based on the hydrocyclone in this example is 13.41 L / s, which far exceeds the maximum drainage capacity of 6.0 L / s specified in the hydraulic calculation section 3.3 of CECS 287 2011 "Technical Specification for Special Single-Pipe Drainage System with Whirlpool Noise Reduction" for whirlpool noise reduction special single-pipe drainage systems. Furthermore, under the same testing environment and standards, the maximum drainage capacity of the special single-pipe drainage system with an internal spiral tube commissioned by a Shanghai-based industrial development company is 9.57 L / s, and the maximum drainage capacity of the special single-pipe system with a hydrocyclone commissioned by a Shanghai-based technology company is 11.19 L / s. Neither of these can achieve the drainage capacity of the whirlpool tee single-pipe drainage system disclosed in this application. Therefore, the whirlpool tee single-pipe drainage system in this application can meet the high-flow-rate drainage needs under conditions of high drainage load or high instantaneous flow.

[0041] Although some preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0042] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A vortex tee for a high-flow-rate single-pipe drainage system, characterized in that, The multi-port body includes a socket fixed at the top inlet of the multi-port body for receiving and inserting a drainage riser; the multi-port body includes a constant diameter section with a transverse inlet, a reduced diameter section connected at the bottom of the constant diameter section, and a spiral guide plate located on the inner edge of the reduced diameter section corresponding to the transverse inlet. The transverse inlet includes a spiral section with the same spiral direction as the guide plate and an oblique guide section located on the side opposite to the spiral direction of the spiral section, used to guide the water flow in the transverse inlet toward the spiral section; the width of the guide plate gradually decreases along the diameter reduction direction of the diameter reduction section, and the included angle between the guide plate and the inner edge surface of the diameter reduction section gradually increases along the diameter reduction direction of the diameter reduction section, with the initial included angle being an acute angle; the socket includes an arc-shaped guide section used to guide the water flow direction, and the water flow outlet direction of the guide section is correspondingly arranged on the opposite side of the transverse inlet direction.

2. The swirl tee according to claim 1, characterized in that, Several water-retaining rings are provided on the outer edge of the junction between the equal diameter section and the reduced diameter section to prevent water seepage; the lower part of the reduced diameter section is provided with reinforcing ribs for installing fire-resistant rings.

3. The swirl tee according to claim 1, characterized in that, The projection of the transverse inlet opening at the equal diameter section onto a horizontal plane perpendicular to the axis of the multi-channel body falls within the projection range of the corresponding guide plate on that horizontal plane.

4. The swirl tee according to claim 1, characterized in that, The pitch of the spiral section is smaller than the pitch of the guide plate.

5. The swirl tee according to claim 4, characterized in that, The spiral angle of the spiral section is 35° to 45°, and the rotation angle of the guide plate along the axis of the multi-pass body is 160° to 180°.

6. The swirl tee according to claim 1 or 5, characterized in that, The angle between the drainage plane of the oblique drainage section and the inlet center line of the spiral section is 0° to 10°.

7. The swirl tee according to claim 1, characterized in that, The angle between the plane where the exit of the guide is located and the horizontal plane perpendicular to the axis of the multi-pass body is 30° to 40°.

8. The swirl tee according to claim 1, characterized in that, The socket also includes a fixing part for fixed connection with the equal diameter part. The fixing part has a boss at the top outer edge and the equal diameter part has a positioning shoulder at the top inner edge that matches the boss and is used to limit the insertion depth of the socket.

9. The swirl tee according to claim 8, characterized in that, The inner diameter of the guide part matches the inner diameter of the drainage riser, and a limiting shoulder is formed at the connection position between the guide part and the fixing part to limit the insertion depth of the drainage riser.

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