Air and water shunt anti-siphon device

Abstract

The application discloses a gas-water diversion anti-siphon device, which comprises a water storage tank body, a water inlet pipe joint, a water outlet pressure-limiting backflow valve assembly, a pressure-loss air inlet valve assembly and a pressure-loss water outlet valve assembly. The water inlet pipe joint is arranged at the upper half of the water storage tank body and is connected with a water supply pipe network. The water outlet pressure-limiting backflow valve assembly is arranged at the lower half of the water storage tank body and is connected with downstream water using appliances. The pressure-loss air inlet valve assembly and the pressure-loss water outlet valve assembly are arranged at the top end and the bottom end of the water storage tank body, respectively. When the water supply pipe network is shut down and negative pressure is generated, the pressure-loss air inlet valve assembly is opened to enable air to enter the water storage tank body and flow into the water supply pipe network through the water inlet pipe joint. Meanwhile, the pressure-loss water outlet valve assembly is opened to discharge the accumulated water in the water storage tank body. Meanwhile, the water outlet pressure-limiting backflow valve assembly is closed to prevent downstream water from flowing back into the water storage tank body.

Description

Technical Field

[0001] This invention relates to the field of bathroom technology, specifically to an air-water diversion anti-siphon device. Background Technology

[0002] The safety of urban water supply networks is directly related to public health, and countries around the world have strict mandatory requirements for the anti-siphon function of water appliances. Anti-siphon refers to preventing wastewater from downstream water appliances from flowing back into the water supply network due to negative pressure caused by water outages or other reasons, thus preventing water pollution. In recent years, with increasingly stringent requirements for water safety, especially in Europe and the United States where more stringent anti-siphon testing standards have been introduced, many innovative water appliances have been unable to enter the market due to their inability to meet anti-siphon standards, with the water fittings of toilets being particularly problematic.

[0003] Existing anti-siphon technologies largely rely on the one-way sealing function of check valves. However, in practical use, impurities are unavoidable in water supply networks, and the valve core of the check valve can easily become stuck, leading to sealing failure. Once the check valve fails, when the water supply is interrupted and negative pressure is generated, downstream sewage will continuously flow back into the water supply network through the failed check valve, causing serious water pollution incidents. Therefore, how to provide a device that can reliably achieve anti-siphon function even when the check valve fails due to sticking is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a gas-water diversion anti-siphon device to solve the problem of downstream sewage backflow and pollution of the water supply network caused by the check valve being easily blocked by impurities and failing, resulting in negative pressure during water outages.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A gas-water diversion anti-siphon device includes a water storage tank, an inlet pipe connector, an outlet pressure limiting backflow valve assembly, a pressure-reducing air inlet valve assembly, and a pressure-reducing outlet valve assembly. The inlet pipe connector is located in the upper half of the water storage tank and connected to a water supply network. The outlet pressure limiting backflow valve assembly is located in the lower half of the water storage tank and connected to downstream water appliances. The pressure-reducing air inlet valve assembly and the pressure-reducing outlet valve assembly are respectively located at the top and bottom of the water storage tank. When the water supply network is interrupted and negative pressure is generated, the pressure-reducing air inlet valve assembly opens to allow air to enter the water storage tank and flow into the water supply network through the inlet pipe connector. At the same time, the pressure-reducing outlet valve assembly opens to discharge the accumulated water in the water storage tank, and the outlet pressure limiting backflow valve assembly closes to prevent downstream water from flowing back into the water storage tank.

[0006] Preferably, the internal diameter area of ​​the outlet of the pressure-limiting backflow valve assembly is smaller than the diameter area of ​​the outlet of the pressure-loss outlet valve assembly, and the air passage area of ​​the pressure-loss air inlet valve assembly is larger than the water inlet diameter area of ​​the inlet pipe joint.

[0007] Preferably, the water inlet pipe connector is positioned on the side of the water storage tank at a position higher than the drain outlet of the pressure-reduced outlet valve assembly.

[0008] Preferably, the overall structural dimensions of the air-water diversion anti-siphon device can be enlarged or reduced according to water supply requirements.

[0009] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: 1. This invention provides an air-water diversion anti-siphon device. Under normal circumstances, through the pressure loss air inlet valve assembly at the top of the water storage tank, the pressure loss water outlet valve assembly at the bottom, and the water outlet pressure limiting backflow valve assembly, when the water supply network stops and negative pressure is generated, the three components work together: the air inlet valve opens to introduce air to break the negative pressure, the water outlet valve opens to discharge the water in the tank, and the backflow valve closes to prevent downstream water backflow, forming an air-water diversion effect where air enters from the top, water is discharged from the bottom, and sewage is intercepted, effectively preventing siphoning.

[0010] 2. This invention provides a gas-water diversion anti-siphon device. Under abnormal conditions, the inlet pipe connector is located in the upper half of the water storage tank. When the outlet pressure limiting backflow valve assembly fails due to foreign object blockage, the downstream backflow water will be discharged directly from the bottom of the tank through the pressure loss outlet valve assembly, and will not be able to rise to the height of the inlet located in the upper half. This completely eliminates the possibility of sewage backflow into the water supply network and solves the fundamental problem of the complete loss of anti-siphon function due to check valve blockage in the prior art. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a diagram illustrating the normal anti-siphon operation of the present invention. Figure 3 This is a diagram illustrating the normal water outage conditions of this invention. Figure 4 This is a diagram illustrating the abnormal anti-siphon working condition of the present invention. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0013] It should be noted that in this invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element of this invention must have a specific orientation, and therefore should not be construed as a limitation of this invention. Example

[0014] Please refer to Figures 1 to 4 As shown, this invention discloses an air-water splitting anti-siphon device, comprising a water storage tank 1, a pressure-reducing air inlet valve assembly 2, a pressure-reducing water outlet valve assembly 3, an inlet pipe connector 4, and an outlet pressure-limiting backflow valve assembly 5. The inlet pipe connector 4 is fixedly installed on the upper half of the side of the water storage tank 1, and its outer end is used to connect to the water supply network. The outlet pressure-limiting backflow valve assembly 5 is fixedly installed on the lower half of the side of the water storage tank 1, and its outlet end is used to connect to downstream water appliances 6 such as toilets, faucets, etc. The pressure-reducing air inlet valve assembly 2 is installed at the top of the water storage tank 1, and the pressure-reducing water outlet valve assembly 3 is installed at the bottom of the water storage tank 1.

[0015] The pressure-reducing air intake valve assembly 2 adopts a gravity-type valve core structure, which contains a valve core that can move up and down. During normal water supply, the valve core is pushed up by water pressure to seal the air intake port. In the event of pressure loss, it falls under its own weight to open the air intake port. The pressure-reducing water outlet valve assembly 3 is a normally closed drain valve. Its valve core is pressed shut by water pressure to close the drain port during normal water supply, and automatically opens in the event of pressure loss. The water outlet pressure-limiting backflow valve assembly 5 integrates a resilient reset check valve. This check valve opens against spring force under positive water pressure from the inlet pipe joint side, and automatically closes under reverse water pressure or pressure loss due to spring force.

[0016] The pressure loss inlet valve assembly 2 is not limited to a gravity-operated valve core; a spring-reset valve core can also be used, as long as it is closed by water pressure during normal water supply and automatically opens when pressure is lost. Similarly, the check valve of the outlet pressure limiting backflow valve assembly 5 is not limited to a helical spring reset; other elastic reset structures such as leaf springs and torsion springs can be used.

[0017] A normal water supply condition When the water supply network is supplying water normally, water flows into the water storage tank 1 through the inlet pipe joint 4. Water pressure simultaneously acts on the pressure loss inlet valve assembly 2, the pressure loss outlet valve assembly 3, and the outlet pressure limiting backflow valve assembly 5. Specifically: water pressure pushes upwards to lift the valve core of the pressure loss inlet valve assembly 2, sealing the inlet and preventing water from overflowing from the top; water pressure presses downwards to tighten the valve core of the pressure loss outlet valve assembly 3, sealing the outlet and preventing water leakage from the bottom; simultaneously, water pressure overcomes the elastic restoring force of the check valve inside the outlet pressure limiting backflow valve assembly 5, pushing open the check valve and allowing water to flow smoothly and supply water normally to downstream water appliances.

[0018] Two normal water outages generate negative pressure conditions When the water supply network experiences a water outage due to maintenance, pipe bursts, or other reasons, creating negative pressure, water in storage tank 1 will flow back towards inlet pipe connector 4. At this time, the valve core of the pressure-reducing air inlet valve assembly 2, losing water pressure support, immediately falls under its own weight, opening the air inlet. Outside air quickly enters storage tank 1 and replenishes the water supply network via inlet pipe connector 4, thus breaking the negative pressure and preventing siphoning. Simultaneously, the check valve inside the outlet pressure-limiting backflow valve assembly 5, losing positive water pressure, immediately closes under spring force, preventing water from downstream appliances from flowing back into storage tank 1. Furthermore, the pressure-reducing outlet valve assembly 3 automatically opens its drain outlet due to pressure loss, quickly discharging any remaining water at the bottom of storage tank 1. Thus, the device achieves a "gas in from the top, water out from the bottom, and wastewater intercepted" air-water separation anti-siphoning effect.

[0019] Abnormal operating condition due to failure of the three-outlet pressure limiting backflow valve assembly In actual use, impurities such as rust and sand are inevitably present in the water supply network. If impurity 6 gets stuck between the valve core and valve seat of the check valve of the outlet pressure limiting backflow valve assembly 5, causing the check valve to fail to close completely, then when the above-mentioned water outage negative pressure occurs, sewage from downstream water appliances will continuously flow back into the bottom of the water storage tank 1 through the failed check valve.

[0020] In this situation, since the pressure-loss outlet valve assembly 3 is already open under pressure-loss conditions, the backflowing sewage will be discharged directly from the drain port at the bottom of the tank, without accumulating inside the water storage tank 1. More importantly, the inlet pipe connector 4 is located on the upper half of the side of the water storage tank 1, and its position is significantly higher than the drain port position of the pressure-loss outlet valve assembly 3 as defined in claim 3. Therefore, even if a small amount of sewage fails to be discharged in time, its water level will be far below the height of the inlet pipe connector 4, making it impossible for it to flow back into the water supply network through the inlet pipe connector 4. This solves the fundamental problem in the prior art where the anti-siphon function is completely lost due to the check valve jamming failure.

[0021] To further optimize the anti-siphon effect, this embodiment features a specially designed flow area. The internal flow area of ​​the outlet of the pressure-limiting backflow valve assembly 5 is designed to be smaller than the flow area of ​​the drain outlet of the pressure-reducing outlet valve assembly 3. This ensures that when the pressure-reducing outlet valve assembly 3 opens, the drainage capacity of the drain outlet is greater than the inlet capacity of the outlet, guaranteeing that backflow water can be discharged promptly and will not accumulate in the tank. Simultaneously, the maximum air passage area of ​​the pressure-reducing air inlet valve assembly 2 is designed to be larger than the inlet flow area of ​​the inlet pipe connector 4. This allows for rapid and sufficient replenishment of outside air into the water supply network during water outages, quickly disrupting the siphon and preventing persistent negative pressure due to insufficient air replenishment.

[0022] The overall structural dimensions of the device of this invention are not fixed. Depending on the actual water supply scenario requirements, such as water supply pipe diameter, design flow rate, and installation space, the volume of the water storage tank 1, the diameter of each interface, and the specifications of each valve assembly can be proportionally enlarged or reduced. As long as it possesses the basic structure of claim 1 and the coordinated operation function of each valve assembly during water outages and negative pressure, it falls within the protection scope of this invention. For example, a smaller size can be selected for single-household water supply, while a larger size can be selected for whole-building or industrial water supply.

[0023] The bottom of the water storage tank 1 is designed to be funnel-shaped or conical, and the drain outlet of the pressure relief valve assembly 3 is located at the lowest point of this bottom. With this design, when the pressure relief valve assembly 3 is opened, the water accumulated in the tank can be completely and quickly discharged, avoiding long-term water accumulation that could breed bacteria or affect the dilution effect during the next use, thus further improving the hygienic performance of the device.

[0024] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A gas-water separation anti-siphon device, characterized in that: The system includes a water storage tank, an inlet pipe connector, an outlet pressure limiting backflow valve assembly, a pressure loss air inlet valve assembly, and a pressure loss outlet valve assembly. The inlet pipe connector is located in the upper half of the water storage tank and is connected to a water supply network. The outlet pressure limiting backflow valve assembly is located in the lower half of the water storage tank and is connected to downstream water appliances. The pressure loss air inlet valve assembly and the pressure loss outlet valve assembly are respectively located at the top and bottom of the water storage tank. When the water supply network is interrupted and negative pressure is generated, the pressure loss air inlet valve assembly opens to allow air to enter the water storage tank and flow into the water supply network through the inlet pipe connector. At the same time, the pressure loss outlet valve assembly opens to discharge the accumulated water in the water storage tank, and the outlet pressure limiting backflow valve assembly closes to prevent downstream water from flowing back into the water storage tank.

2. The gas-water diversion anti-siphon device as described in claim 1, characterized in that: The internal diameter area of ​​the outlet of the pressure-limiting backflow valve assembly is smaller than the diameter area of ​​the drain outlet of the pressure-loss outlet valve assembly, and the air passage area of ​​the pressure-loss air inlet valve assembly is larger than the water inlet diameter area of ​​the inlet pipe joint.

3. The gas-water diversion anti-siphon device as described in claim 1, characterized in that: The inlet pipe connector is positioned on the water storage tank at a position higher than the drain outlet of the pressure-reduced outlet valve assembly.

4. The gas-water diversion anti-siphon device as described in claim 1, characterized in that: The overall structural dimensions of the air-water diversion anti-siphon device can be enlarged or reduced according to water supply requirements.

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