Groove type high spiral rib inner spiral pipe for building drainage

Abstract

The utility model relates to a mute internal spiral drain pipe. The technical problem to be solved is to overcome the defects in the prior art and provide the high-spiral rib internal spiral pipe which can change the form of falling water flow in a drainage vertical pipe, effectively reduce the fluctuation amplitude of air pressure in the pipe and improve the drainage capacity of the drainage vertical pipe. In order to achieve the purpose of the utility model, the utility model provides the groove type high spiral rib internal spiral pipe for building drainage, which comprises a pipe body and at least one spiral rib which is arranged on the inner wall of the pipe body and is coaxial with the pipe axis, and is characterized in that at least two grooves are arranged on the upstream face of the spiral rib. The spiral wall-attached water flow has the beneficial effects that the spiral wall-attached water flow which is formed by scattering and splashing part of water flow to the center of the pipe during drainage of a traditional inner spiral pipe and a high-spiral rib inner spiral pipe is changed into the completely continuous spiral wall-attached water flow which is free of scattering and splashing water foam in the center of the pipe and is tightly attached to the inner wall of the pipe; therefore, the unique effects of increasing the thickness of a spiral wall-attached water flow water film and reducing the fluctuation amplitude of gas pressure in the pipe are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pipe material of building drainage system, specifically relates to a mute inner spiral drainage pipe. BACKGROUND

[0002] When building drainage vertical pipe drains, there is a gas-liquid two-phase gravity flow state, that is, the water flow flows downward by gravity and carries the air flow downward at the same time. A drainage vertical pipe with excellent performance needs to have a larger drainage flow rate for the same caliber under the condition that the system water seal is not damaged, so that the water trap on the residential bathroom and kitchen drainage branch pipe does not cause a return smell due to water seal damage under a larger drainage capacity (drainage flow rate), ensuring residential health and safety. The key to preventing water seal damage is to ensure that the air flow pressure fluctuation value caused by water seal oscillation loss in the drainage vertical pipe within the maximum drainage capacity (drainage flow rate) range is controlled within the specified range (±400Pa according to CJJ / T 245-2016 "Residential Life Drainage System Vertical Pipe Drainage Capacity Test Standard"), so as to control the water seal loss of the water trap within 25mm. However, when the drainage flow rate of the drainage vertical pipe increases, the water film thickness of the wall-attached water flow increases, the influence of the frictional resistance of the inner wall is weakened, the falling water flow rate increases, and the air flow rate in the pipe carried by the water flow also increases, thereby causing the air pressure fluctuation amplitude in the pipe to increase. Therefore, increasing the drainage flow rate of the vertical pipe and reducing the pressure fluctuation amplitude in the pipe are contradictory.

[0003] The specific description is as follows: referring to Figure 1 , when the smooth-wall drainage vertical pipe drains under the gravity flow state, the water flow flows downward in the wall-attached water flow state, Figure 1 A1 is a smooth-wall pipe body, A2 is a wall-attached water flow, and A3 is an air flow. As the drainage flow rate increases, the water film thickness of the wall-attached water flow increases, gradually forming a water plug flow (see Figure 2 , Figure 2 A4 is a water plug flow), and until a full-pipe flow is formed. When the water plug flow is formed in the pipe as the drainage flow rate increases, the water plug flow blocks the passage of the downward air flow, a high-pressure area of positive pressure is formed above the water plug flow, and a low-pressure area of negative pressure is formed below the water plug flow, causing a large pressure fluctuation in the drainage vertical pipe. The drainage horizontal branch pipe in the high-pressure area above the water plug flow of the drainage vertical pipe will cause the water seal of the water trap to splash due to the high pressure, causing the foul gas in the pipe to overflow. The drainage horizontal branch pipe in the low-pressure area below the water plug flow of the drainage vertical pipe will cause the water seal of the water trap to be sucked due to the negative pressure, causing the water seal protection function to fail. Therefore, when designing the drainage vertical pipe of the building life drainage system, the water flow state in the vertical pipe should be controlled in the wall-attached water flow state to avoid the occurrence of water plug flow and full-pipe flow.

[0004] In the prior art, in order to solve the above contradictions, mainly adopt the structure of setting inner spiral rib in the inner wall of pipe material, increase the friction resistance of the inner wall of the drainage vertical pipe, reduce the falling speed of water flow, increase the water film thickness of the wall-attached water flow, reduce the air flow speed and pressure fluctuation amplitude in the pipe. There are several ways to set the inner spiral rib:

[0005] (1) As shown in FIG. 3(a) and FIG. 3(b), one way is to set a plurality of low spiral ribs B2 with triangular cross section rotating counterclockwise downward along the inner wall of the inner spiral pipe body B1, which is called a plurality of rib inner spiral pipe. For example, the Chinese utility model patent with the publication number CN202220914U discloses a pipe material with spiral protrusions on the inner wall, which includes a pipe body, and a plurality of spiral protrusions are integrally formed on the inner wall of the pipe body. This kind of inner spiral pipe material increases the friction resistance between the falling water flow and the pipe wall, reduces the water flow speed and pressure fluctuation, and its drainage capacity is improved compared with the smooth wall pipe.

[0006] But the defects of this way are: when the drainage flow increases and the water film of the wall-attached water flow is thick, the lower triangular spiral rib B2 cannot effectively block most of the counterclockwise rotating water flow W3, so that the rotating wall-attached water flow W2 flows in a wave shape along the inner wall of the pipe, which cannot effectively reduce the water flow speed, and the inclined angle α° of the water surface of the plurality of triangular spiral ribs B2 towards the center also easily causes the water flow to change direction and move towards the center of the pipe Figure 5 ), with the increase of the drainage capacity, the water flow divided by the ribs has a strong tendency to move away from the rib surface towards the center of the vertical pipe, which will cause the splashing water foam W1 of the several water flows to collide violently in the pipe, forming an alternating impact water plug flow falling on the pipe wall, blocking the air flow channel in the pipe, causing the pressure fluctuation to rise sharply, the noise to increase, and the water seal to be damaged, resulting in the occurrence of the phenomenon of toilet return odor; the more the number of divided water flows, the more the impact points on the pipe wall, and the greater the pipeline vibration and noise. The drainage capacity of the DN100 single vertical pipe with this structure is about 6.5-7.5 liters / second.

[0007] (2) As shown in FIG. 4(a), FIG. 4(b), another way is to provide at least one high spiral rib C2 with a cross-section of an acute triangle and a high height on the inner wall of the inner spiral pipe body C1 rotating downward and counterclockwise. For example, the high rib noise reduction spiral drainage pipe disclosed in the Chinese Utility Model Patent with the publication number CN216520258U adopts a high spiral rib on the inner wall, or the silent spiral drainage pipe disclosed in the Chinese Invention Patent Application with the publication number CN109099230A adopts a high spiral rib as the main rib and an auxiliary rib, which are all designed in this way. The high spiral rib on the inner wall of the inner spiral pipe material blocks part of the wall-attached water flow falling along the pipe wall, forcing part of the wall-attached water flow to rotate and fall along the spiral rib, effectively reducing the water flow speed and pressure fluctuation, and further improving the drainage capacity of the inner spiral pipe.

[0008] However, the defects of this way are that when the drainage flow further increases, the counterclockwise rotating water flow W3 cannot form a continuous rotating wall-attached water flow W2 under the action of the triangular high spiral rib C2, and the triangular high spiral rib C2 still has an inclined angle a° facing the water center, which also easily causes part of the water flow to drift along the edge of the high spiral rib C2 to the center of the pipe, forming water mist and splashing water foam W1( Figure 6 ), which further increases the density of the mixed air containing water foam in the pipe center, increases the air flow resistance in the pipe, and intensifies the air pressure fluctuation in the pipe, which easily causes the water seal of the water trap to be damaged, and also limits the further improvement of the drainage capacity. The drainage capacity of the DN100 single vertical pipe adopting this structure is about 9.5-10.5 liters / second. SUMMARY

[0009] The technical problem to be solved by the utility model is to overcome the defects of the prior art, and provide a high spiral rib inner spiral pipe for changing the falling water flow form in the drainage vertical pipe, effectively reducing the air pressure fluctuation amplitude in the pipe, and improving the drainage capacity of the drainage vertical pipe.

[0010] In order to achieve the above utility model purposes, a trench type high spiral rib inner spiral pipe for building drainage is provided, which comprises a pipe body and at least one spiral rib coaxial with the pipe axis on the inner wall of the pipe body, characterized in that at least two grooves are provided on the water-facing surface of the spiral rib.

[0011] Further, the rib height h1 of the outermost edge groove of the spiral rib farthest from the pipe wall is greater than the rib height h2 of the other inner grooves.

[0012] Preferably, the height difference between the rib height h1 of the outermost edge groove of the spiral rib farthest from the pipe wall and the rib height h2 of the other inner grooves is at least 1.0 mm.

[0013] Further, the height h of the spiral rib is 8.5mm-16mm.

[0014] Further, the spiral rib is inclined to the pipe wall.

[0015] Preferably, the included angle β° between the spiral rib and the tangent of the outer edge of the pipe body is 50°-85°.

[0016] Further, the helix angle a of the spiral rib is 55°-70°.

[0017] Preferably, the spiral rib is counterclockwise downward rotation.

[0018] Preferably, the spiral rib is an integral structure formed by one-time extrusion of the pipe material.

[0019] The utility model discloses the beneficial effects are:

[0020] (1) the groove design on the water surface of spiral rib, can effectively increase the surface area of the water surface of spiral rib and water flow contact, thereby increasing the frictional resistance between the water surface and the wall-attached spiral water flow, effectively retarding the flow rate of the spiral wall-attached water flow, slowing down the flow rate of the air carried by the spiral wall-attached water flow in the pipe, reducing the amplitude of the gas pressure fluctuation in the pipe, so that the drainage vertical pipe is in the standard allowable pressure fluctuation range, bears greater drainage flow (drainage capacity).

[0021] (2) the height difference setting of the outer high and inner low groove can further effectively block the drift and splash of the falling spiral wall-attached water flow to the pipe center, reduce the content of water mist in the downward airflow in the middle of the vertical pipe and the density of the mixed airflow, greatly reduce the ventilation resistance and pressure fluctuation amplitude, help to further improve the drainage capacity.

[0022] (3) the design of the water surface of the spiral rib being inclined to the pipe wall makes the falling spiral wall-attached water flow receive a reaction force F directed to the pipe wall when encountering the water surface of the groove type high spiral rib, further enhances the wall-attached effect of the falling spiral water flow, prevents the drift of water mist to the pipe center, reduces the pressure fluctuation amplitude in the pipe, increases the water film thickness of the wall-attached water flow, and greatly improves the drainage capacity (drainage flow) of the drainage vertical pipe.

[0023] In conclusion, the groove type high spiral rib structure design is adopted in the utility model, compared with the traditional inner spiral pipe and the high spiral rib inner spiral pipe, when used for the drainage vertical pipe, the water flow form flowing through the vertical pipe is fundamentally changed, the spiral wall-attached water flow scattered and splashed to the pipe center when the drainage is performed by the traditional inner spiral pipe and the high spiral rib inner spiral pipe is changed into the spiral wall-attached water flow without scattered and splashed water foam in the pipe center, which is completely continuous and close to the inner wall of the pipe. The density of the air flow in the pipe center is reduced, the wall-attached water flow with a thicker wall-attached water film thickness (larger drainage flow) can be intercepted, the flow speed of the spiral wall-attached water flow and the air flow speed in the pipe carried by the water flow are reduced. Therefore, the unique effects of the increased wall-attached water film thickness of the spiral wall-attached water flow and the reduced air pressure fluctuation range in the pipe are brought, so that the drainage vertical pipe system can bear larger drainage flow within the pressure fluctuation range of ±400Pa specified in the standard, and the drainage capacity can be increased by more than 30%. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model will be explained in further detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0025] Figure 1 It is a drainage vertical pipe wall-attached water flow schematic view;

[0026] Figure 2 It is a drainage vertical pipe water plug flow schematic view;

[0027] Fig. 3 (a) is the structure schematic view of the multiple rib inner spiral pipe in the prior art;

[0028] Fig. 3 (b) is the sectional schematic view of the multiple rib inner spiral pipe in the prior art;

[0029] Fig. 4 (a) is the structure schematic view of the high spiral rib inner spiral pipe in the prior art;

[0030] Fig. 4 (b) is the sectional schematic view of the high spiral rib inner spiral pipe in the prior art;

[0031] Figure 5 It is the drainage vertical pipe water flow form schematic view of the multiple rib inner spiral pipe in the prior art;

[0032] Figure 6 It is the drainage vertical pipe water flow form schematic view of the high spiral rib inner spiral pipe in the prior art;

[0033] Fig. 7 (a) is the sectional view of the groove type high spiral rib inner spiral pipe of one preferred embodiment of the utility model;

[0034] Fig. 7 (b) is the local structure enlarged schematic view of the embodiment shown in Fig. 7 (a);

[0035] Figure 7(c) is a schematic view of the elevation of the embodiment shown in Figure 7(a);

[0036] Figure 8 Figure 7(c) is a schematic view of the elevation of the embodiment shown in Figure 7(a);

[0037] Figure 9 Figure 7(c) is a schematic view of the elevation of the embodiment shown in Figure 7(a);

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] A1, light wall tube; A2, wall water flow; A3, air flow; A4, water plug flow;

[0040] B1, inner spiral tube; B2, low spiral rib; C1, high rib inner spiral tube; C2, high spiral rib;

[0041] W1, splash water; W2, rotating wall water flow; W3, counterclockwise rotating water flow;

[0042] 1, tube; 2, grooved high spiral rib; 3, high spiral rib water surface; 4, outer edge groove rib; 5, inner side groove rib. DETAILED DESCRIPTION

[0043] The preferred embodiment of the grooved high spiral rib inner spiral tube for building drainage of the utility model, please see Figure 7(a), Figure 7(b), Figure 7(c) in conjunction with. The preferred embodiment is integrally formed by hot plastic extrusion, and in structure, a grooved high spiral rib inner spiral tube is arranged on the inner wall of the drainage vertical pipe, which is coaxial with the pipe axis and rotates counterclockwise downward; when a plurality of grooved high spiral ribs or a grooved high spiral rib and other auxiliary spiral ribs are used in the inner spiral tube, the hydraulic characteristics of the structure of the utility model are achieved, and this still belongs to the protection scope of the utility model. The grooved high spiral rib is integrally formed by one-time extrusion molding with the pipe material; when injection molding or other materials or other molding processes are used to achieve the structural characteristics of the utility model, this still belongs to the protection scope of the utility model.

[0044] The preferred method uses high spiral ribs with an overall height h ranging from 8.5mm to 16mm, and 2 to 3 grooves are provided on the water-facing surface of the high spiral ribs. The increased height of the grooved high spiral ribs can handle a larger drainage flow (greater water film thickness). The groove design increases the surface area of ​​the grooved high spiral ribs in contact with the water flow by 2 to 2.5 times compared to traditional high spiral ribs, increasing the frictional resistance between the water-facing surface of the grooved high spiral ribs and the spiral water flow attached to the wall. This effectively slows down the flow velocity of the spiral water flow attached to the wall, reduces the flow velocity of the air entrained in the pipe by the spiral water flow, and reduces the amplitude of air pressure fluctuations in the pipe. This allows the drainage riser to handle a larger drainage flow (drainage capacity) within the standard allowable pressure fluctuation range. The embodiments shown in Figures 7(a), 7(b), and 7(c) are high spiral rib inner spiral pipes with 3 grooves.

[0045] Preferably, the grooved ribs of the outer edge of the high spiral rib are of higher height (h1) than the inner grooved ribs (h2). The height difference between the outer and inner grooved ribs effectively prevents the falling spiral water from drifting and splashing towards the center of the pipe, reducing the water droplet content and the density of the mixed airflow in the middle of the riser. This significantly reduces ventilation resistance and pressure fluctuations, contributing to further improvement in drainage capacity. In the embodiments shown in Figures 7(a), 7(b), and 7(c), the grooved rib height (h1) of the outer spiral pipe is approximately 2.0 mm to 2.5 mm, and the inner grooved rib height (h2) is approximately 1 mm.

[0046] The preferred design employs a grooved, high-spiral ribbed rib with the water-facing surface inclined towards the pipe wall. The angle β° between the water-facing surface and the tangent to the outer edge of the pipe is designed to be 50°–85°. This ensures that when the falling spiral-attached water flow encounters the water-facing surface of the grooved, high-spiral ribbed rib, it experiences a reaction force F pointing towards the pipe wall (see [reference]). Figure 8 This design enhances the wall adhesion effect of the descending spiral water flow, prevents water droplets from drifting towards the center of the pipe, reduces the pressure fluctuation amplitude inside the pipe, increases the water film thickness of the wall-attached water flow, and greatly improves the drainage capacity (drainage flow rate) of the drainage riser. The angle β° between the water-facing surface and the tangent of the outer edge of the pipe body in the embodiments shown in Figures 7(a), 7(b), and 7(c) is 65°.

[0047] The preferred design employs a grooved, high-spiral rib structure with a downward counter-clockwise rotation of the spiral helix angle α within the range of 55° to 70°, coaxial with the pipe axis. This design achieves optimal spiral wall-attached water flow. The downward counter-clockwise rotation is used to maintain alignment with the Earth's rotation direction, thereby achieving a greater rotational speed. In the Northern Hemisphere, the rotation is counter-clockwise, while in the Southern Hemisphere, it is clockwise. For example... Figure 8 As shown, the helix angle α in this preferred embodiment is 60°.

[0048] See Figure 7(c) in conjunction withFigure 8 , a is the helix angle; t is the pitch; l is the tube circumference; di is the tube inner diameter; De is the tube outer diameter. The formula for calculating the pitch according to the helix angle a is: t=tan a·pi·di.

[0049] As Figure 9 The inner spiral pipe cross section water flow pattern diagram of the utility model shows, the water flow that flows through the stand pipe through the groove type high spiral rib structure function of the utility model, make the water flow pattern change fundamentally, become the spiral wall-attached water flow W2 that the pipe center has no scattering splash water foam, from the spiral wall-attached water flow that part water flow scatters and splashes to the pipe center when the traditional inner spiral pipe and high spiral rib inner spiral pipe drainage. The density of the air flow in the pipe center is reduced, the wall-attached water flow with thicker wall-attached water film thickness (larger drainage flow) can be intercepted, the flow velocity of the spiral wall-attached water flow and the air flow velocity in the pipe carried by the water flow are reduced. Thus bring the unique effect of the water film thickness of the spiral wall-attached water flow increasing and the amplitude of the gas pressure fluctuation in the pipe reducing, so that the drainage stand pipe system can bear larger drainage flow in the pressure fluctuation range of ± 400Pa specified by the standard, the drainage capacity can be improved by more than 30%.

[0050] The above-mentioned embodiments are only used to illustrate the utility model, and are not limited to the utility model. Any skilled person in the art can make various modifications, changes or replacements without departing from the technical scope disclosed by the utility model. Therefore, all equivalent and similar technical methods should be covered in the patent protection scope of the utility model.

Claims

1. A grooved, highly spiral-ribbed inner spiral pipe for building drainage, comprising a pipe body and at least one spiral rib coaxial with the pipe axis disposed on the inner wall of the pipe body, characterized in that: The spiral rib has at least two grooves on its water-facing surface.

2. A grooved, high-spiral-ribbed, inner spiral pipe for building drainage according to claim 1, characterized in that: The height h1 of the outermost groove of the spiral rib, which is furthest from the pipe wall, is greater than the height h2 of the ribs in the other inner grooves.

3. A grooved, high-spiral-ribbed, inner spiral pipe for building drainage according to claim 2, characterized in that: The height difference between the outermost groove of the spiral rib furthest from the pipe wall (h1) and the inner groove of the spiral rib (h2) is at least 1.0 mm.

4. A grooved, high-spiral-ribbed, inner spiral pipe for building drainage according to claim 1, 2, or 3, characterized in that: The height h of the spiral rib is 8.5mm to 16mm.

5. A grooved, high-spiral-ribbed, inner spiral pipe for building drainage according to claim 4, characterized in that: The spiral ribs are inclined toward the tube wall.

6. A grooved, high-spiral-ribbed, inner spiral pipe for building drainage according to claim 5, characterized in that: The angle β° between the spiral rib and the tangent to the outer edge of the tube is 50° to 85°.

7. A grooved, high-spiral-ribbed, inner spiral pipe for building drainage according to claim 6, characterized in that: The spiral helix angle α of the spiral rib is 55° to 70°.

8. A grooved, high-spiral-ribbed, inner spiral pipe for building drainage according to claim 7, characterized in that: The spiral ribs rotate counterclockwise downwards.

9. A grooved, high-spiral-ribbed, inner spiral pipe for building drainage according to claim 8, characterized in that: The spiral ribs are an integral structure formed by one-time extrusion of the tube.

Images