Drainage system air inlet device capable of preventing peculiar smell and bacterial aerosol from flowing backwards

Abstract

The drainage system air inlet device comprises a valve seat, a valve cover and a valve element, the valve cover covers the valve seat, the valve element is arranged on the valve seat, an air inlet hole is formed in the valve cover, the air inlet hole corresponds to the valve element, the valve element comprises a valve rod, a spring and a sealing block, a vent hole and an installation hole are formed in the valve seat, and the valve rod corresponds to the valve rod. One end of the valve rod is located below the mounting hole, the other end of the valve rod penetrates through the mounting hole and then extends upwards, the vent hole is located on the periphery of the mounting hole, the sealing block is arranged on the valve rod in a sleeving mode and located below the vent hole, and the spring is arranged on the valve rod in a sleeving mode and located above the vent hole. When the trap of the drainage pipeline is in a negative pressure state, external air enters through the air inlet hole and then enters the valve seat and the drainage pipeline through the vent hole, so that the air pressure of the drainage pipeline and the external air pressure are kept balanced, and the situation that a water seal is evacuated and damaged by negative pressure in the pipeline is avoided; therefore, peculiar smell and bacterial aerosol of the drainage pipeline are prevented from flowing back into a room.

Description

Technical Field

[0001] This utility model relates to an air intake valve device, and more particularly to an air intake device for a drainage system that prevents odors and bacterial aerosol backflow. Background Technology

[0002] To prevent sewage gases from entering buildings, plumbing regulations mandate the installation of water traps in all sanitary fixtures. The purpose of these traps is to create a barrier between the building and the sewage system using the water seal within the trap. However, the water seal can be compromised in two situations: excessively high positive pressure within the pipes and excessively low negative pressure (i.e., excessive vacuum). When the pressure exceeds the critical value that the water seal can withstand, the barrier fails. At this point, harmful gases, bacteria, and viruses from the drainage system can invade the building, endangering human health. Especially during pandemics, sewers become a significant channel for virus transmission, making residents in the same building highly susceptible to infection from bacteria and viruses spread through the drainage system.

[0003] Currently, many newly constructed buildings typically install dedicated vent pipes (independent vent pipes), which effectively release the positive pressure exerted on lower floors during drainage from higher floors. However, while this method eliminates the damage to the water seal in the trap caused by positive pressure, it still cannot solve the problem of negative pressure during indoor drainage damaging the water seal, leading to the disappearance of the water seal barrier. Currently, to address the damage to the trap caused by negative pressure, some domestic practices involve installing one-way valves at the drain outlet for protection. For example, application number 200680034547.7 discloses an air inlet valve. This air inlet valve has a relatively complex structure and is easily contaminated by dirt, affecting the sealing effect under normal conditions and causing odors to be emitted from the pipes. Utility Model Content

[0004] The purpose of this utility model is to provide an air intake device for a drainage system that can solve at least one of the above problems, preventing odor and bacterial aerosol backflow.

[0005] According to one aspect of this utility model, an air intake device for a drainage system that prevents odor and bacterial aerosol backflow is provided, including a valve seat, a valve cover, and a valve core. The valve cover is disposed on the valve seat, and the valve core is disposed on the valve seat. The valve cover has an air inlet hole corresponding to the valve core. The valve core includes a valve stem, a spring, and a sealing block. The valve seat has a vent hole and a mounting hole. One end of the valve stem is located below the mounting hole, and the other end extends upward through the mounting hole. The vent hole is located on the outer periphery of the mounting hole. The sealing block is sleeved on the valve stem and located below the vent hole. The spring is sleeved on the valve stem and located above the vent hole.

[0006] The beneficial effects of this utility model are as follows: By providing a valve seat, the entire unit can be easily fixed to the corresponding position in the water trap of the drain pipe. With springs and sealing blocks at the upper and lower ends of the vent, when the water trap is under negative pressure, outside air enters through the air inlet and then through the vent into the valve seat, thus entering the drain pipe. This maintains a balance between the air pressure in the drain pipe and the outside air pressure, preventing the negative pressure inside the pipe from emptying and destroying the water seal. This ensures the water trap maintains a normal water seal, preventing odors and bacterial aerosols from flowing back into the room. Simultaneously, when the water trap is not draining, the spring's rebound force keeps the sealing block tightly against the vent, ensuring the entire air intake device is sealed and preventing odors from escaping the pipe.

[0007] In some embodiments, the valve stem is T-shaped, with the larger end of the stem positioned above the vent. A horizontal plate is provided on the valve seat, with both the vent and mounting holes located on the horizontal plate. The top end of the spring abuts against the larger end of the valve stem, and the bottom end abuts against the horizontal plate. This structural design of the valve stem facilitates the installation of the spring.

[0008] In some embodiments, there are multiple vent holes, with partitions between adjacent vent holes. A limiting protrusion is provided below the horizontal plate, and the vent holes are located inside the limiting protrusions. The sealing block is located below the vent holes, and the outer periphery of the sealing block is tightly fitted against the inner wall of the limiting protrusion. Thus, by providing partitions, the overall strength can be ensured, and it is beneficial for the sealing block to fit tightly against the partitions.

[0009] In some embodiments, the lower end face of the partition is inclined, and the lower end face of the partition gradually concaves from the outside to the inside. Therefore, when the positive pressure inside the drainage pipe is large, that is, greater than the external atmospheric pressure, the sealing block is pressed tightly against the lower end face of the partition under the action of positive pressure. By inclining the lower end face of the partition, the sealing block can better fit the partition, thereby achieving a sealing effect.

[0010] In some embodiments, the upper end face of the sealing block is tapered, and the upper end face of the sealing block fits against the lower end face of the partition. This ensures that even under high positive pressure within the pipeline, the sealing block remains firmly attached to the lower end face of the partition, preventing separation between the sealing block and the vent, thus guaranteeing a sealing effect.

[0011] In some embodiments, the valve stem is provided with a mounting groove, and the sealing block is fitted into the mounting groove. Therefore, the mounting groove facilitates the installation of the sealing block.

[0012] In some embodiments, a waterproof cover is provided above the horizontal plate, positioned above the outer periphery of the vent, with its top end higher than the top end of the air inlet. This height of the waterproof cover prevents water droplets or dust impurities from entering the air inlet from directly entering the vent, effectively preventing water droplets or dirt from falling into the sealing block and vent, thus ensuring the sealing effect of the sealing block, improving the overall service life, and eliminating the need for frequent replacement and cleaning.

[0013] In some embodiments, the sealing block has a through hole in the middle, through which it is fitted onto the valve stem. A reinforcing step is provided on the upper surface of the sealing block, located on the outer periphery of the through hole. Thus, by providing the reinforcing step, cracking at the through hole of the sealing block is effectively prevented, ensuring its normal use and improving the sealing effect.

[0014] In some embodiments, there are multiple air inlets, and a flange is provided on the upper part of the valve cover. The flange is located above the air inlets, and the bottom of the air inlets is lower than the upper surface of the horizontal plate. Therefore, by providing a flange, the amount of water droplets entering the air inlets can be reduced, which can play a certain role in shielding; by the bottom of the air inlets being lower than the upper surface of the horizontal plate, the formation of water accumulation on the valve seat can be effectively prevented, which can facilitate the timely drainage of water inside the valve seat and thus reduce the formation of dirt.

[0015] In some embodiments, the valve seat has a mounting position, and the valve cover is fitted onto the outside of the mounting position. A snap fastener is provided on the outer wall of the mounting position, and a latch is provided on the inner wall of the valve cover. The latch engages with the snap fastener. Thus, the engagement of the latch and snap fastener facilitates a tight fit between the valve cover and the valve seat. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the air intake device of a drainage system for preventing odor and bacterial aerosol backflow according to this utility model.

[0017] Figure 2 This is a cross-sectional structural diagram of the air intake device of a drainage system for preventing odor and bacterial aerosol backflow according to this utility model.

[0018] Figure 3 This is a schematic diagram of the valve seat in the air intake device of a drainage system for preventing odor and bacterial aerosol backflow, according to this utility model.

[0019] Figure 4 yes Figure 3 A top-view structural diagram.

[0020] Figure 5 yes Figure 3 A cross-sectional structural diagram.

[0021] Figure 6This is a cross-sectional view of the sealing block in the air intake device of a drainage system for preventing odor and bacterial aerosol backflow, according to this utility model. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] Reference Figures 1-6 An air intake device for a drainage system designed to prevent odor and bacterial aerosol backflow includes a valve seat 1, a valve cover 2, and a valve core 3. The valve cover 2 is mounted on the valve seat 1, and the valve core 3 is mounted on the valve seat 1. The valve cover 2 has an air inlet 21 corresponding to the valve core 3. The valve core 3 includes a valve stem 31, a spring 32, and a sealing block 33. The valve seat 1 has a vent hole 11 and a mounting hole 12. One end of the valve stem 31 is located below the mounting hole 12, and the other end extends upward through the mounting hole 12. The vent hole 11 is located on the outer periphery of the mounting hole 12. The sealing block 33 is sleeved on the valve stem 31 and located below the vent hole 11. The spring 32 is sleeved on the valve stem 31 and located above the vent hole 11. The valve cover 2 and the valve seat 1 are both integrally injection molded structures.

[0024] In practical use, the sealing block 33 can be made of rubber to meet the deformation and strength requirements of the sealing block under pressure. There are multiple air inlets 21, which helps to reduce the diameter of a single air inlet 21 while still meeting the air intake requirements. When the diameter of the air inlet 21 is reduced, it can prevent mosquitoes and other insects from entering through the air inlet 21 to a certain extent, thereby preventing mosquitoes and other insects from entering between the vent 11 and the sealing block 33, thus helping to maintain the sealing effect of the sealing block 33.

[0025] In order to facilitate the installation of the whole unit and the drainage pipe, the air intake device of the drainage system of this utility model for preventing odor and bacterial aerosol backflow has threads formed on the lower outer side of the valve seat 1. There are corresponding threaded installation holes at the corresponding positions of the water trap of the drainage pipe. Thus, the valve seat 1 can be directly tightened and fixed on the drainage pipe by the threads, which is convenient for installation.

[0026] When the pressure inside the drainage pipe is greater than the external atmospheric pressure, that is, when the sealing block 33 is under positive pressure, the sealing block 33 adheres tightly to the vent 11 under the action of positive pressure, sealing the vent 11 and preventing odors, bacterial aerosols, etc. from being discharged into the room, thereby helping to reduce the spread of diseases through the drainage pipe.

[0027] When the pressure inside the drainage pipe is the same as the external atmospheric pressure, under the action of the spring 32's rebound force, the spring 32 pushes the valve stem 31 upward, thereby pulling the sealing block 33 on the valve stem 31 upward, so that the sealing block 33 can be tightly attached to the bottom of the vent hole 11, maintaining the sealing effect of the vent hole 11.

[0028] When the drainage pipe is under negative pressure, outside air enters through the air inlet 21 under the action of atmospheric pressure. Under the action of air pressure, the sealing block 33 is pushed downward, releasing the sealing effect of the sealing block 33 on the vent 11, allowing outside air to enter the drainage pipe through the vent 11. This allows the air pressure inside the drainage pipe to gradually reach equilibrium with the atmospheric pressure, thus preventing the water seal in the trap from being destroyed under the negative pressure during drainage. In other words, it prevents the drainage pipe from destroying the water seal under the siphon effect. Therefore, it ensures that there is always a water seal at the trap, preventing bacteria and odors in the drainage pipe from entering the room through the pipe, thereby effectively reducing the spread of bacteria in the same building through the drainage pipe.

[0029] The valve stem 31 is T-shaped, with the larger end of the valve stem 31 located above the vent hole 11. The valve seat 1 is provided with a horizontal plate 13, and the vent hole 11 and the mounting hole 12 are both located on the horizontal plate 13. The top end of the spring 32 abuts against the larger end of the valve stem 31, and the bottom end abuts against the horizontal plate 13.

[0030] There are multiple vent holes 11, with partitions 14 between adjacent vent holes 11. A limiting protrusion 15 is located below the horizontal plate 13, and the vent holes 11 are located inside the limiting protrusion 15. A sealing block 33 is located below the vent holes 11, and the outer periphery of the sealing block 33 is tightly fitted against the inner wall of the limiting protrusion 15. The vent holes 11 can be triangular, circular, or other shapes, as long as the air intake meets the requirements. The partitions 14 ensure strong contact with the sealing block 33. With multiple vents 11, air entering through the air inlet can easily enter the drainage pipe under air pressure, balancing the air pressure. When the negative pressure in the drainage pipe is -249 Pa, the air intake flow rate can reach 38.8 liters / minute; when the negative pressure in the drainage pipe is -504 Pa, the air intake flow rate can reach 59.6 liters / minute; and when the negative pressure in the drainage pipe is -12000 Pa, the air intake flow rate can reach 370 liters / minute, which is sufficient to meet the usage requirements. Therefore, it can be applied to building indoor drainage pipe systems, RVs, and mobile facilities such as ships and high-speed trains.

[0031] The lower end face of the partition 14 is inclined and gradually concave from the outside to the inside. The upper end face of the sealing block 33 is conical and fits against the lower end face of the partition 14. When the sealing block 33 is subjected to positive pressure, the upper end face of the sealing block 33 is pressed tightly against the lower end face of the partition 14, and the sealing block 33 deforms accordingly, pressing tightly against the vent hole 11. The edge of the sealing block 33 is pressed against the inner wall of the limiting protrusion 15, maintaining the sealing effect of the sealing block 33 on the vent hole 11. Under a relatively small positive pressure environment, with a 10 mm water column, there is no change in the water column after 15 minutes of sealing; with a 73 mm water column, there is no change in the water column after 24 hours of sealing; when the positive pressure reaches 65 kPa, there is no leakage of water column after 15 minutes, indicating a very good sealing effect.

[0032] The valve stem 31 has a mounting groove 311, and the sealing block 33 is fitted into the mounting groove 311. The mounting groove 311 facilitates the limiting installation of the sealing block 33.

[0033] A waterproof cover 16 is installed above the horizontal plate 13. The waterproof cover 16 is located above the outer periphery of the vent 11, and its top is higher than the top of the air inlet 21. The waterproof cover 16 is a hollow vertical cylindrical structure. Air entering through the air inlet 21 passes through the top of the waterproof cover 16 before entering the vent 11. With the waterproof cover 16, when the entire device is used outdoors, water droplets entering through the air inlet 21 are blocked by the waterproof cover 16 and cannot fall directly onto the sealing block, ensuring the sealing effect of the sealing block.

[0034] A through hole 331 is provided in the middle of the sealing block 33. The sealing block 33 is fitted onto the valve stem 31 through the through hole 331. A reinforcing step 332 is provided on the upper end face of the sealing block 33, located on the outer periphery of the through hole 331. By providing the reinforcing step 332, the thickness of the through hole 331 can be increased. Therefore, when the sealing block 33 is installed on and removed from the valve stem 31, it can effectively prevent the through hole 331 from being torn under tensile force, thus ensuring the service life of the sealing block 33. At the same time, by providing the reinforcing step 332, the sealing performance at the mating point between the valve stem 31 and the sealing block 33 can be enhanced, preventing gaps from appearing at the mating point.

[0035] The upper part of the valve cover 2 is formed with a flange 22, which is located above the air inlet 21. The bottom of the air inlet 21 is lower than the upper surface of the horizontal plate 13. The flange 22 provides a certain degree of shielding, preventing water from the top of the valve cover from flowing down the outer wall of the valve cover 2 and entering the air inlet 21. Since the bottom of the air inlet 21 is lower than the upper surface of the horizontal plate 13, water entering through the side air inlet 21 can be discharged through the air inlet 21, avoiding water accumulation inside the device and thus greatly preventing the formation of dirt and improving the overall service life.

[0036] The valve seat 1 has a mounting position 17 formed on it. The valve cover 2 is fitted onto the outside of the mounting position 17. A snap fastener 18 is provided on the outer wall of the mounting position 17, and a latch 23 is provided on the inner wall of the valve cover 2. The latch 23 engages with the snap fastener 18. When the valve cover 2 is installed, its bottom is fitted onto the mounting position 17, aligning the latch 23 with the snap fastener 18, so that the snap fastener 18 engages within the latch 23. Multiple latches 23 are provided, and multiple snap fasteners 18 are provided to increase the stability of the fit between the valve cover 2 and the valve seat 1. When the snap fastener 18 engages with the latch 23, it effectively prevents the valve cover 2 from being removed, improving overall integrity.

[0037] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. An air intake device for a drainage system that prevents odor and bacterial aerosol backflow, characterized in that, The valve includes a valve seat (1), a valve cover (2), and a valve core (3). The valve cover (2) is placed on the valve seat (1), and the valve core (3) is placed on the valve seat (1). The valve cover (2) has an air inlet (21) corresponding to the valve core (3). The valve core (3) includes a valve stem (31), a spring (32), and a sealing block (33). The valve seat (1) has a vent hole (11) and a mounting hole (12). One end of the valve stem (31) is located below the mounting hole (12), and the other end extends upward through the mounting hole (12). The vent hole (11) is located on the outer periphery of the mounting hole (12). The sealing block (33) is sleeved on the valve stem (31) and located below the vent hole (11). The spring (32) is sleeved on the valve stem (31) and located above the vent hole (11).

2. The air intake device for a drainage system to prevent odor and bacterial aerosol backflow according to claim 1, characterized in that, The valve stem (31) is T-shaped, with the large end of the valve stem (31) located above the vent hole (11). The valve seat (1) is provided with a horizontal plate (13), and the vent hole (11) and the mounting hole (12) are both located on the horizontal plate (13). The top end of the spring (32) abuts against the large end of the valve stem (31), and the bottom end abuts against the horizontal plate (13).

3. The air intake device for a drainage system to prevent odor and bacterial aerosol backflow according to claim 2, characterized in that, There are multiple vent holes (11), and a partition (14) is provided between adjacent vent holes (11). A limiting protrusion (15) is provided below the horizontal plate (13). The vent holes (11) are located inside the limiting protrusion (15). The sealing block (33) is located below the vent holes (11). The outer periphery of the sealing block (33) is in close contact with the inner wall of the limiting protrusion (15).

4. The air intake device for a drainage system that prevents odor and bacterial aerosol backflow according to claim 3, characterized in that, The lower end face of the partition (14) is inclined, and the lower end face of the partition (14) gradually concave from the outside to the inside.

5. The air intake device for a drainage system to prevent odor and bacterial aerosol backflow according to claim 4, characterized in that, The upper end face of the sealing block (33) is tapered, and the upper end face of the sealing block (33) is in contact with the lower end face of the partition (14).

6. An air intake device for a drainage system that prevents odor and bacterial aerosol backflow according to any one of claims 1 to 5, characterized in that, The valve stem (31) is provided with an installation groove (311), and the sealing block (33) is fitted into the installation groove (311).

7. An air intake device for a drainage system that prevents odor and bacterial aerosol backflow according to any one of claims 2 to 5, characterized in that, A waterproof cover (16) is provided above the horizontal plate (13). The waterproof cover (16) is located above the outer periphery of the vent (11), and the top of the waterproof cover (16) is higher than the top of the air inlet (21).

8. The air intake device for a drainage system to prevent odor and bacterial aerosol backflow according to claim 5, characterized in that, The sealing block (33) has a through hole (331) in the middle. The sealing block (33) is sleeved on the valve stem (31) through the through hole (331). The upper end face of the sealing block (33) has a reinforcing step (332), which is located on the outer periphery of the through hole (331).

9. The air intake device for a drainage system to prevent odor and bacterial aerosol backflow according to claim 7, characterized in that, There are multiple air inlets (21), and the upper part of the valve cover (2) is provided with a flange (22). The flange (22) is located above the air inlets (21), and the bottom of the air inlets (21) is lower than the upper surface of the horizontal plate (13).

10. An air intake device for a drainage system that prevents odor and bacterial aerosol backflow according to any one of claims 1 to 5, characterized in that, The valve seat (1) is provided with an installation position (17), the valve cover (2) is sleeved on the outside of the installation position (17), the outer wall of the installation position (17) is provided with a buckle (18), the inner wall of the valve cover (2) is provided with a slot (23), and the slot (23) cooperates with the buckle (18).

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