Device for improving air pressure fluctuation of drainage transverse branch pipe

Abstract

The utility model discloses a device for improving air pressure fluctuation of a drainage transverse branch pipe, which relates to the technical field of building water supply and drainage and comprises the drainage transverse branch pipe communicated with a plurality of sanitary ware, a transverse branch pipe air pressure balance pipe and a plurality of connecting pipes. The starting end of the drainage transverse branch pipe is closed or provided with a closed cleaning opening, and the tail end of the drainage transverse branch pipe is communicated with the drainage vertical pipe. Sewage of the sanitary ware is discharged into the drainage transverse branch pipe and then is discharged through the drainage vertical pipe; a plurality of connecting pipes are arranged on the drainage transverse branch pipe, and 1-2 drainage pipes of the sanitary ware are connected between every two adjacent connecting pipes; the connecting pipes are all communicated with the transverse branch pipe air pressure balance pipe, and the connecting pipes close to the starting end and the tail end of the drainage transverse branch pipe are communicated with the two ends of the transverse branch pipe air pressure balance pipe respectively. According to the utility model, the problem of overlarge air pressure fluctuation of the drainage transverse branch pipe caused by unfavorable drainage of multiple sanitary wares, especially combined drainage of multiple sanitary wares, can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of building water supply and drainage, in particular to a device for improving air pressure fluctuations in drainage transverse branch pipes. Background Art

[0002] When multiple sanitary appliances are draining water at the same time and the flow rate of the building drainage lateral branch pipe is large, the water flow forms a hydraulic jump at different parts of the drainage lateral branch pipe, affecting the air pressure balance in the pipe. When the sanitary appliances are draining water, the air flow at the beginning of the drainage lateral branch pipe cannot flow due to the closure of the beginning of the drainage lateral branch pipe, and the gas is compressed to form a positive pressure area; when the drainage is completed, part of the gas at the beginning of the drainage lateral branch pipe will be carried away with the water flow, thus forming a negative pressure area at the beginning of the lateral branch pipe.

[0003] As the drainage flow rate continues to increase, the air pressure fluctuations in the drainage branch pipes become larger and larger, causing the water seals of sanitary appliances and floor drains to be destroyed. The drainage capacity of the pipeline depends on the maximum allowable air pressure fluctuations and the maximum allowable drainage volume under the condition that the water seal is not destroyed. The "Standard for Testing the Drainage Capacity of Riser Pipes in Residential Drainage Systems" (CJJ / T 245-2016) issued by the Ministry of Housing and Urban-Rural Development in 2016 also uses the relative pressure value when the water seal loss is 25mm as the pressure judgment value. The maximum pressure judgment value when using the instantaneous flow method for drainage testing is ±300Pa, and the maximum pressure judgment value when using the constant flow method for drainage is ±400Pa.

[0004] Therefore, ventilation is an important measure for the building drainage system to ensure smooth drainage and stable air pressure. Ventilation is used to ensure the pressure balance in the drainage branch pipe, so that the drainage in the pipe is smooth, thereby maintaining the water seal height of the water trap of the sanitary appliance, and preventing harmful gases and potential pathogens from spreading into the room.

[0005] At present, the building drainage system mainly focuses on the stability of the vertical pipe air pressure, and adopts ventilation measures such as special vent pipes and combined vent pipes to reduce the pressure fluctuations in the vertical pipe. For the horizontal branch pipe, according to the "Design Standard for Building Water Supply and Drainage" (GB50015-2019), the drainage horizontal branch pipes that connect 4 or more sanitary appliances and the length of the horizontal branch pipe is greater than 12m and the sewage horizontal branch pipes that connect 6 or more toilets should be equipped with annular vent pipes. When more than six sanitary appliances are draining, the water flow and air pressure in the drainage horizontal branch pipe are complex and changeable. The use of annular vent pipes can reduce the amplitude of air pressure fluctuations in the pipe and maintain air pressure stability. However, in practice, the setting of special annular vent pipes needs to consider factors such as the location of the pipe, and the setting and installation are relatively complicated.

[0006] In addition, the Chinese patent with the authorization announcement number CN204492108U in the existing patents discloses a side wall ventilation device for public toilets, in which a through hole for the ventilation pipe to pass through is provided on the wall of the side wall of the public toilet, and the ventilation pipe is bent upward outside the wall. When the outdoor wind direction is perpendicular to the wall body, the harmful gas in the drainage pipe will not flow back into the room, and it has good ventilation performance. However, it does not take into account the complexity and variability of the water flow and air pressure in the long drainage transverse branch pipe and affects the aesthetics of the building. When the sanitary ware adjacent to the side wall ventilation pipe is drained, the water jump caused by the discharge water flow will block the gas in the drainage transverse branch pipe from communicating with each other, and the air pressure in the transverse branch pipe far away from one end of the side wall ventilation pipe cannot be maintained, so the application is limited. Utility Model Content

[0007] Purpose of the utility model: In view of the problems in the prior art, the utility model provides a device for improving the air pressure fluctuation in the drainage lateral branch pipe. By adding a lateral branch pipe air pressure balance pipe, the air pressure fluctuation in various places in the drainage lateral branch pipe is improved, the drainage capacity is improved, and harmful gases and potential pathogens can be effectively prevented from diffusing into the room while ensuring the beauty of the building.

[0008] Technical solution: A device for improving the air pressure fluctuation of drainage horizontal branch pipes, comprising drainage horizontal branch pipes connected to a plurality of sanitary appliances, horizontal branch pipe air pressure balance pipes, and a plurality of connecting pipes. The beginning of the drainage horizontal branch pipes is closed or provided with a closed cleaning port, and the end of the drainage horizontal branch pipes is connected to the drainage vertical pipe; the sewage of the sanitary appliances is discharged into the drainage horizontal branch pipes and then discharged through the drainage vertical pipes;

[0009] The drainage transverse branch pipe is provided with multiple connecting pipes, and the drainage pipes of 1-2 sanitary appliances are connected between two adjacent connecting pipes; the multiple connecting pipes are all connected to the transverse branch pipe air pressure balance pipe, and the connecting pipes close to the starting and end of the drainage transverse branch pipe are respectively connected to the two ends of the transverse branch pipe air pressure balance pipe.

[0010] Furthermore, the angle between the connecting pipe and the drainage lateral branch pipe is 30 to 60 degrees.

[0011] Furthermore, the horizontal branch pipe air pressure balance pipe is suspended and installed 10 to 30 cm above the drainage horizontal branch pipe.

[0012] Furthermore, both ends of the connecting pipe are connected to the transverse branch pipe air pressure balance pipe and the drainage transverse branch pipe through a sealing interface.

[0013] Furthermore, the diameters of the air pressure balance pipe of the horizontal branch pipe and the connecting pipe are the same, not larger than the diameter of the drainage horizontal branch pipe and not less than 25 mm.

[0014] Beneficial effects:

[0015] 1) The utility model can reduce the problem of excessive pressure fluctuation in drainage lateral branches caused by drainage of multiple sanitary appliances, especially in the case of unfavorable combined drainage of multiple sanitary appliances. After adding a lateral branch pressure balance pipe, when multiple sanitary appliances are draining at the same time, the positive pressure or negative pressure state formed by the water jump at different parts of the drainage lateral branch can be self-balanced through the lateral branch pressure balance pipe, and the gas can supplement the negative pressure area from the positive pressure area through the lateral branch pressure balance pipe, thereby reducing the pressure fluctuation in the pipe and improving the water flow capacity.

[0016] 2) Compared with the annular vent pipe, the device of the utility model has the advantages of being simple and easy to use, with a shorter pipeline, simple installation and processing, low cost and simple maintenance. Compared with the side wall vent pipe, the utility model maintains the beauty of the building. The utility model has a significant effect on maintaining the air pressure balance in the drainage transverse branch pipe and improving the drainage capacity in the pipe. The air pressure fluctuation in the drainage transverse branch pipe is reduced by the transverse branch pipe air pressure balance pipe, thereby avoiding the damage of the water seal of sanitary appliances and floor drains. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a device for improving the air pressure fluctuation of a drainage transverse branch pipe when the air pressure balance pipe of the transverse branch pipe is balanced at three points in Example 1 of the utility model;

[0018] Figure 2 It is a structural schematic diagram of a device for improving the air pressure fluctuation of a drainage transverse branch pipe when the air pressure balance pipe of the transverse branch pipe is balanced at two points in Example 2 of the utility model;

[0019] Figure 3 This is a relationship diagram between the drainage flow rate of the horizontal branch air pressure balance pipe and the peak air pressure in Example 1 of the utility model;

[0020] Figure 4 This is a relationship diagram between the drainage flow rate of the horizontal branch air pressure balance pipe and the peak air pressure in Example 2 of the utility model;

[0021] In the figure: 1- drainage horizontal branch pipe; 2- horizontal branch pipe air pressure balance pipe; 3- connecting pipe; 4- sanitary ware No. 1; 5- sanitary ware No. 2; 6- sanitary ware No. 3. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is described in detail below with reference to the accompanying drawings, but the protection scope of the utility model is not limited to the embodiments.

[0023] Example 1

[0024] The device for improving the pressure fluctuation of the drainage branch pipe in Example 1 is as follows: Figure 1As shown, there are three sanitary appliances on the drainage horizontal branch pipe 1, namely, sanitary appliance No. 1 4, sanitary appliance No. 2 5, and sanitary appliance No. 3 6, all of which are toilets; the horizontal branch pipe air pressure balance pipe 2 is installed in parallel above the drainage horizontal branch pipe 1, with a suspension distance of 20 cm; there are connecting pipes 3 between the sanitary appliance No. 1 4 and the sanitary appliance No. 2 5, between the sanitary appliance No. 2 5 and the sanitary appliance No. 3 6, and between the sanitary appliance No. 3 6 and the drainage vertical pipe, and these three connecting pipes 3 are connected with the beginning, middle, and end of the horizontal branch pipe air pressure balance pipe 2. There are three interconnections between the drainage horizontal branch pipe and the horizontal branch pipe air pressure balance pipe. The angle between the connecting pipe 3 and the drainage horizontal branch pipe 1 is 45°.

[0025] The drainage lateral branch pipe 1 is made of UPVC pipe with a diameter of 100 mm; the lateral branch pipe air pressure balance pipe 2 is made of UPVC pipe with a diameter of 40 mm; the connecting pipe 3 is made of UPVC pipe with a diameter of 40 mm.

[0026] Pressure measuring tubes were set at different positions on the drainage lateral branch pipes, and the maximum flow rate that could pass was tested under the control condition that the pressure fluctuation in the pressure measuring tube did not exceed +400Pa. The tests were conducted separately with and without the pressure balancing tubes on the lateral branch pipes, and the relationship between the maximum positive pressure in the drainage lateral branch pipe and the drainage flow rate was measured when the No. 2 and No. 3 sanitary appliances were draining water at the same time. The results are as follows: Figure 3 As shown, compared Figure 3 From the relationship between the maximum positive pressure and drainage flow in the drainage transverse branch pipe without and with a transverse branch pipe air pressure balance pipe, it can be seen that the drainage system using a DN100 (pipe diameter is 100mm) drainage transverse branch pipe and an additional DN40 (pipe diameter is 40mm) transverse branch pipe air pressure balance pipe has an average drainage capacity of 1.52L / s higher than that without a transverse branch pipe air pressure balance pipe under the condition of maximum air pressure allowance.

[0027] Example 2

[0028] The device for improving the pressure fluctuation of the drainage branch pipe in Example 1 is as follows: Figure 1 As shown, there are three sanitary appliances on the drainage transverse branch pipe 1, namely, sanitary appliance No. 1 4, sanitary appliance No. 2 5, and sanitary appliance No. 3 6, all of which are toilets; the transverse branch pipe air pressure balance pipe 2 is installed in parallel above the drainage transverse branch pipe 1, with a suspension distance of 30cm; there are connecting pipes 3 between sanitary appliance No. 1 4 and sanitary appliance No. 2 5, and between sanitary appliance No. 2 5 and sanitary appliance No. 3 6, respectively, and these two connecting pipes 3 are connected to the beginning and end of the transverse branch pipe air pressure balance pipe 2. There are two places of interconnection between the drainage transverse branch pipe and the transverse branch pipe air pressure balance pipe. The angle between the connecting pipe 3 and the drainage transverse branch pipe 1 is 45°.

[0029] The drainage lateral branch pipe 1 is made of UPVC pipe with a diameter of 100mm; the lateral branch pipe air pressure balance pipe 2 is made of UPVC pipe with a diameter of 50mm; the connecting pipe 3 is made of UPVC pipe with a diameter of 50mm.

[0030] Pressure measuring tubes are set at different positions on the drainage horizontal branch pipe, and the maximum flow rate that can pass is tested under the control condition that the pressure fluctuation in the pressure measuring tube does not exceed +400Pa. The relationship between the maximum positive pressure in the drainage horizontal branch pipe and the drainage flow rate when the No. 2 sanitary ware and the No. 3 sanitary ware are drained at the same time is tested separately with and without the horizontal branch pipe pressure balance pipe. The results are as follows: Figure 4 As shown, compared Figure 4 From the relationship between the maximum positive pressure and drainage flow in the drainage cross branch with and without a cross branch air pressure balance pipe, it can be seen that the drainage system using a DN100 drainage cross branch and an additional DN50 cross branch air pressure balance pipe has an average drainage capacity of 1.14L / s higher than that without a cross branch air pressure balance pipe under the maximum air pressure allowable conditions.

[0031] The test results of the above two embodiments indicate that the device of the present invention can effectively reduce air pressure fluctuations, improve drainage capacity, effectively avoid odor overflow, and reduce the risk of virus transmission.

[0032] The utility model provides a device for improving the air pressure fluctuation of the drainage transverse branch pipe, and the working principle is as follows: when the sanitary ware is draining, the water flows down into the drainage transverse branch pipe, and a water jump is formed on both sides of the water flow falling point in the drainage transverse branch pipe. Since the gas at the beginning of the drainage transverse branch pipe cannot flow, a positive pressure zone is formed at the beginning of the drainage transverse branch pipe. As the drainage flow rate increases, the intensity of the water jump is greater, resulting in negative pressure or positive pressure at different positions in the transverse branch pipe. When the air pressure fluctuation exceeds +400Pa, it will cause the water seal of the sanitary ware to be damaged. After adding a transverse branch pipe air pressure balance pipe, the drainage transverse branch pipe can balance the pressure of various parts in the drainage transverse branch pipe by connecting the transverse branch pipe air pressure balance pipe, thereby achieving the purpose of reducing the air pressure fluctuation in the pipe. The angle between the connecting pipe and the drainage transverse branch pipe is 30 to 60 degrees, which is conducive to the liquid flowing back to the drainage transverse branch pipe by gravity and keeping the transverse branch pipe air pressure balance pipe unobstructed.

[0033] The above embodiments are for the purpose of enabling persons skilled in the art to understand and use the invention. Personnel skilled in the art can obviously easily modify these embodiments and apply the general principles of this description to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by persons skilled in the art based on the principles of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A device for improving air pressure fluctuation in drainage lateral pipes, characterized in that: The device for improving the air pressure fluctuation of the drainage lateral branch pipe comprises a drainage lateral branch pipe connected to a plurality of sanitary appliances, a lateral branch pipe air pressure balance pipe, and a plurality of connecting pipes. The beginning end of the drainage lateral branch pipe is closed or provided with a closed cleaning port, and the end of the drainage lateral branch pipe is connected to the drainage vertical pipe; the sewage of the sanitary appliances is discharged into the drainage lateral branch pipe and then discharged through the drainage vertical pipe; The drainage transverse branch pipe is provided with multiple connecting pipes, and the drainage pipes of 1 to 2 sanitary appliances are connected between two adjacent connecting pipes; the multiple connecting pipes are all connected to the transverse branch pipe air pressure balance pipe, and the connecting pipes close to the starting and ending ends of the drainage transverse branch pipe are respectively connected to the two ends of the transverse branch pipe air pressure balance pipe.

2. A device for improving air pressure fluctuation in drainage lateral pipes according to claim 1, characterized in that: The angle between the connecting pipe and the drainage lateral branch pipe is 30 to 60 degrees.

3. The device for improving air pressure fluctuation in drainage lateral pipes according to claim 1, characterized in that: The air pressure balance pipe of the horizontal branch pipe is suspended and installed 10 to 30 cm above the horizontal drainage branch pipe.

4. The device for improving air pressure fluctuation in drainage lateral branch pipes according to claim 1, characterized in that: The two ends of the connecting pipe are connected to the horizontal branch pipe air pressure balance pipe and the drainage horizontal branch pipe through a sealing interface.

5. The device for improving air pressure fluctuation in drainage lateral pipes according to claim 1, characterized in that: The diameters of the air pressure balance pipe and the connecting pipe of the horizontal branch pipe are the same, not larger than the diameter of the drainage horizontal branch pipe and not less than 25 mm.

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