Anti-siphon structure and multi-stage protection anti-reflux vacuum breaker device with same

Abstract

This invention proposes an anti-siphon structure and a multi-stage protection device for preventing backflow and vacuum disruption. The anti-siphon structure includes a flow channel and a suction stop. The flow channel is located inside the valve body and has an abutment portion with a flow opening on its periphery. The suction stop is made of elastic material and includes a suction stop body and an elastic diaphragm disposed on the outer periphery of the suction stop body. The outer periphery of the elastic diaphragm is sealed to the valve body to separate the flow channel. The elastic diaphragm corresponds axially to the flow opening. The suction stop body has an axially penetrating conveying channel. The first end of the suction stop body faces the abutment portion, and the second end has multiple elastic valves that can converge. In natural or negative pressure conditions, the anti-siphon structure forms a first seal between the first end of the suction stop body and the abutment portion through the elastic diaphragm, while simultaneously forming a second seal by automatically converging the multiple elastic valves at the second end of the suction stop body. The two seals improve the redundancy and overall stability of the anti-siphon system.

Description

Technical Field

[0001] This invention relates to the field of media conveying technology, and in particular to an anti-siphon structure and a multi-level protection device for preventing backflow and vacuum disruption. Background Technology

[0002] In the water supply and drainage systems of civil and public buildings, the safety of sanitary ware is directly related to the water quality assurance and public health level of the water supply system. When the water supply network experiences pressure fluctuations due to maintenance, water outages, or peak water usage, a negative pressure state may occur within the network. Under such circumstances, if the inlet of toilets and other sanitary ware cannot effectively isolate the water in the tank from the water supply pipeline, the siphon effect may cause the used water in the tank to flow back into the municipal pipeline along the inlet pipe, thus potentially affecting the public water supply system. Current relevant industry standards have incorporated anti-siphon performance into one of the core technical requirements for products such as smart toilets and sanitary ceramics, clearly stipulating that water in the toilet tank must not flow back into the water supply pipeline under negative pressure conditions.

[0003] To meet the aforementioned safety requirements, existing sanitary ware products generally employ anti-siphon devices such as vacuum breaker or one-way check valves. However, in practical applications: on the one hand, some anti-siphon devices rely primarily on a single sealing interface to block backflow, lacking redundancy in their protective capabilities. If this sealing interface fails to seal properly due to impurities, deformation, or other factors, the anti-backflow effect may be affected. On the other hand, some solutions providing multiple layers of protection often require numerous independent components to work together, resulting in a more complex structure. This not only increases the difficulty of manufacturing and assembly but also makes it inconvenient to selectively install one or more anti-siphon units in the valve body's flow channel according to different application scenarios, thus requiring improved layout flexibility.

[0004] Therefore, how to design an anti-siphon technology solution that ensures backflow stability while having a relatively simple structure and high sealing redundancy is a problem worthy of attention in this field. Summary of the Invention

[0005] In view of this, the present invention proposes an anti-siphon structure and a multi-level protection anti-backflow vacuum destruction device, the purpose of which is to improve the sealing redundancy and stability of the anti-siphon structure and reduce the structural complexity.

[0006] Firstly, the technical solution of the present invention is implemented as follows:

[0007] An anti-siphon structure, comprising:

[0008] A flow channel is provided inside the valve body for the flow of medium. The flow channel is provided with an abutment part, and the periphery of the abutment part is provided with a flow opening for the medium to pass through.

[0009] A suction stop is disposed within the flow channel and located behind the flow opening. The suction stop is made of elastic material and includes a suction stop body and an elastic diaphragm disposed on the outer periphery of the suction stop body. The outer periphery of the elastic diaphragm is sealed to the valve body to separate the flow channel. The elastic diaphragm corresponds to the flow opening in the axial direction. The suction stop body has an axially penetrating conveying channel. The first end of the suction stop body faces the abutment portion, and its second end has multiple elastic valves that can be brought together.

[0010] Under natural or negative pressure conditions, the elastic diaphragm seals the first end of the anti-sucking body against the abutment portion, thereby sealing the first end of the delivery channel; and the elastic valves of the sealing portion converge to seal the second end of the delivery channel.

[0011] Under positive pressure, the elastic diaphragm deforms under the medium pressure, causing the first end of the anti-sucking body to separate from the abutting part; and the elastic valve of the sealing plate opens under the medium pressure.

[0012] As a further optional solution, the first end of the anti-sucking body is provided with an abutment ring, which is arranged around the outer periphery of the end opening of the conveying channel;

[0013] The abutting part includes a cone protruding in the direction of the anti-suction member and a retaining ring surrounding the outside of the cone. A groove is formed between the retaining ring and the cone, and the abutting ring abuts against the bottom of the groove.

[0014] As a further alternative, the anti-absorption body is cylindrical, and the elastic valve is provided in two pieces, with the ends of the elastic valves extending outside the delivery channel, so that the convergence point of the multiple elastic valves is located outside the delivery channel.

[0015] As a further optional solution, the anti-sucking component also includes a fixing ring disposed on the outer periphery of the elastic diaphragm. The fixing ring is integrally formed with the elastic diaphragm and the anti-sucking body, and the thickness of the fixing ring is greater than that of the elastic diaphragm.

[0016] Compared with the prior art, the anti-siphon structure of the present invention has the following technical effects:

[0017] 1. High sealing redundancy and good backflow prevention stability: Under natural or negative pressure conditions, the anti-siphon structure uses the pressure applied by the elastic diaphragm to form a first seal between the first end of the anti-siphon body and the contact part. Simultaneously, multiple elastic valves at the second end of the anti-siphon body automatically converge to form a second seal. The two seals are independent of each other. Even if the sealing performance of one seal deteriorates due to impurities, deformation, or other factors, the other seal can still maintain effective blocking, thereby improving the redundancy and overall stability of the anti-siphon system.

[0018] 2. The structure is relatively simple, which helps to reduce the difficulty of manufacturing and assembly: The anti-suction component is a one-piece molded structure, which integrates multiple functional features such as elastic diaphragm, anti-suction body and multiple elastic valves on a single component. It can achieve double sealing by cooperating with the abutment part in the valve body without assembling multiple independent components.

[0019] 3. Easy to arrange flexibly in the valve body: This anti-siphon structure relies only on the abutment and anti-sucking components in the flow channel. Therefore, one or more anti-siphon structures can be easily installed in the flow channel of the valve body according to different anti-backflow requirements without significantly increasing the overall complexity. This flexibility allows it to adapt to various application scenarios from single-stage protection to multi-stage protection.

[0020] Secondly, the technical solution of the present invention is implemented as follows:

[0021] A multi-level protective anti-backflow vacuum breaking device includes the aforementioned anti-siphon structure.

[0022] As a further optional solution, the multi-stage protection anti-backflow vacuum rupture device includes a valve body, the valve body having a flow channel, the flow channel including a medium inlet, a medium outlet, an air inlet, and a cavity where the three meet; the cavity has an abutment part, the medium inlet being located on the periphery of the abutment part; the cavity has a suction-stopping component, a transmission component, and a valve core; the cavity and its internal suction-stopping component and abutment part form the anti-siphon structure;

[0023] The anti-suction component includes an anti-suction body and an elastic diaphragm disposed on the outer periphery of the anti-suction body. The outer periphery of the elastic diaphragm is sealed to the valve body to separate the cavity. The medium inlet is located on one side of the elastic diaphragm, and the medium outlet and air inlet are located on the other side of the elastic diaphragm. The elastic diaphragm corresponds axially to the opening position of the medium inlet. The anti-suction body has an axially penetrating conveying channel. The first end of the anti-suction body faces the abutment portion, and its second end has multiple elastic valves that can be converged.

[0024] The transmission element is used to transmit the elastic deformation motion of the elastic diaphragm to the valve core, so as to drive the valve core to move;

[0025] Under natural or negative pressure conditions, the elastic diaphragm seals the first end of the anti-suction body against the abutment portion, thereby sealing the first end of the delivery channel; and the elastic valves of the sealing portion converge to seal the second end of the delivery channel; the medium inlet and medium outlet are disconnected, and the air inlet is open;

[0026] Under positive pressure, the elastic diaphragm deforms under the medium pressure, causing the first end of the anti-suction body to separate from the abutting part, and causing the valve core to block the air inlet; the elastic valve of the sealing plate opens under the medium pressure; the medium inlet and the medium outlet are connected.

[0027] As a further optional solution, the medium inlet and the air inlet are arranged opposite to each other within the cavity;

[0028] The transmission component is a spring, one end of which is sleeved on the outside of the anti-suction body and abuts against the elastic diaphragm, and the other end abuts against the valve core.

[0029] As a further optional solution, the air inlet is provided with a guide structure, and the valve core is slidably engaged with the guide structure so that the valve core slides axially.

[0030] As a further optional solution, the valve core is provided with a sealing gasket to achieve a sealed connection with the air inlet.

[0031] As a further optional solution, the medium outlet is located on the periphery of an abutment portion, and a suction-stopping element is provided behind the medium outlet so that the location of the medium outlet forms the anti-siphon structure.

[0032] Compared with the prior art, the multi-stage protection anti-backflow vacuum breaking device of the present invention has the following technical effects:

[0033] 1. Multi-level protection mechanism enhances safety: Under natural or negative pressure conditions, the air inlet opens, allowing external air to enter and actively disrupt the siphon effect. Simultaneously, the first end of the anti-siphon component seals against the contact portion, and the elastic valve at the second end converges, forming two seals to block backflow. This creates a composite protection mechanism combining "air entry disrupting the vacuum" and "two seals blocking backflow in the anti-siphon structure." Under positive pressure conditions, the elastic diaphragm deforms, causing the first end of the anti-siphon body to separate from the contact portion, and the elastic valve opens, allowing the medium to flow. Simultaneously, the valve core is driven by the transmission component to seal the air inlet, preventing medium leakage. This multi-level, multi-mechanism protection design better addresses complex operating conditions such as pipeline pressure fluctuations and impurities, reducing the risk caused by the failure of a single protection element.

[0034] 2. Automatic synchronization of linkage actions without additional control: The transmission component (e.g., spring) directly transmits the deformation movement of the elastic diaphragm to the valve core, so that the opening and closing of the air inlet is automatically linked with the conduction / sealing state of the anti-siphon structure: when the pressure is negative, the anti-siphon structure is sealed and the air inlet is open; when the pressure is positive, the anti-siphon structure is open and the air inlet is closed. Attached Figure Description

[0035] Figure 1This is a cross-sectional schematic diagram (in natural state or negative pressure state) of an anti-siphon structure provided in an embodiment of the present invention.

[0036] Figure 2 This is a cross-sectional schematic diagram (positive pressure state) of an anti-siphon structure provided in an embodiment of the present invention.

[0037] Figure 3 This is an exploded view of the anti-suction member and the abutment portion provided in an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of a multi-level protection anti-backflow vacuum destruction device provided in an embodiment of the present invention;

[0039] Figure 5 This is an explosion diagram of a multi-level protection anti-backflow vacuum destruction device provided in an embodiment of the present invention;

[0040] Figure 6 yes Figure 4 Schematic diagram of the cross section of AA;

[0041] Figure 7 yes Figure 4 Cross-sectional view of BB;

[0042] Figure 8 yes Figure 4 A cross-sectional view of the C-section.

[0043] In the diagram: 1. Valve body;

[0044] 2. Flow channel; 21. Medium inlet; 22. Medium outlet; 23. Air inlet; 24. Cavity;

[0045] 3. Flow opening;

[0046] 4. Abutting part; 41. Cone; 42. Retaining ring; 43. Slot;

[0047] 5. Anti-suction component; 51. Anti-suction body; 511. Conveying channel; 512. Elastic valve; 513. Abutment ring; 52. Elastic diaphragm; 53. Fixing ring;

[0048] 6. Transmitted items;

[0049] 7. Valve core; 71. Sealing gasket;

[0050] 8. Guiding structure. Detailed Implementation

[0051] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0052] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0055] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0056] Example 1

[0057] refer to Figures 1 to 3 This illustrates an anti-siphon structure, including a flow channel 2 and a suction stop 5;

[0058] The flow channel 2 is located inside the valve body 1 to allow the medium to flow. The flow channel 2 is provided with an abutment part 4, and the periphery of the abutment part 4 is provided with a flow opening 3 for the medium to pass through.

[0059] The anti-suction element 5 is disposed within the flow channel 2 and located behind the flow opening 3. The anti-suction element 5 is made of elastic material and includes an anti-suction body 51 and an elastic diaphragm 52 disposed on the outer periphery of the anti-suction body 51. The outer periphery of the elastic diaphragm 52 is sealed to the valve body 1 to separate the flow channel 2. The elastic diaphragm 52 corresponds to the flow opening 3 in the axial direction. The anti-suction body 51 is provided with an axially penetrating conveying channel 511. The first end of the anti-suction body 51 faces the abutment portion 4, and its second end is provided with multiple elastic valves 512 that can be gathered together.

[0060] The aforementioned suction stop 5 is located behind the flow opening 3, meaning behind it in the forward flow direction of the medium. Furthermore, the elastic diaphragm 52 corresponds to the flow opening 3 in the axial direction, meaning that the axial projection range of the flow opening 3 falls on the elastic diaphragm 52. In this way, when the forward-flowing medium flows out of the flow opening 3, it can directly act on the elastic diaphragm 52.

[0061] The anti-sucking element 5 is integrally molded from an elastic material, such as silicone rubber, fluororubber, or thermoplastic elastomer. The anti-sucking body 51 is generally cylindrical or tubular, with an axially continuous conveying channel 511 inside. An elastic diaphragm 52 extends outward from the outer periphery of the anti-sucking body 51 in a sheet-like shape, and its outer edge is sealed to the inner wall of the valve body 1, thereby dividing the flow channel 2 into two regions located upstream and downstream of the elastic diaphragm 52. The medium needs to cross the upstream and downstream sides through the conveying channel 511. The end face of the first end of the anti-sucking body 51 (i.e., the end facing the abutment portion 4) is constructed as a sealing surface that can tightly fit with the abutment portion 4. The second end of the anti-sucking body 51 is provided with multiple elastic valves 512, which, when not subjected to positive medium pressure, rely on their own elasticity to converge and close the second end of the conveying channel 511.

[0062] Under natural or negative pressure conditions, there is no positive pressure within the flow channel 2 sufficient to cause significant deformation of the elastic diaphragm 52; in fact, a reverse pressure differential may even occur. In this state, the elastic diaphragm 52 remains in its initial position due to its own elastic restoring force and applies a pushing force towards the abutment portion 4 to the anti-suction body 51, causing the first end of the anti-suction body 51 to tightly abut against the abutment portion 4, thereby sealing the first end of the conveying channel 511. Simultaneously, the elastic valve 512 at the second end of the anti-suction body 51 naturally converges under its own elasticity, sealing the second end of the conveying channel 511. Thus, both ends of the conveying channel 511 are sealed, preventing the medium from flowing backwards to the upstream side even if negative pressure or a siphon effect occurs downstream.

[0063] Under positive pressure, the upstream medium has a certain pressure. The medium first passes through the flow opening 3 on the periphery of the contact part 4, and then directly impacts the surface of the elastic diaphragm 52. The medium pressure overcomes the elastic restoring force of the elastic diaphragm 52, causing the elastic diaphragm 52 to deform away from the contact part 4. Since the anti-suction body 51 is connected to the elastic diaphragm 52, the deformation of the elastic diaphragm 52 causes the anti-suction body 51 to move together, causing the first end of the anti-suction body 51 to separate from the contact part 4, thereby opening the first end of the delivery channel 511. At the same time, the pressure of the forward-flowing medium acts on the inner side of the elastic valve 512, forcing multiple elastic valves 512 to open outward, and the second end of the delivery channel 511 opens accordingly. The medium can then flow from the upstream side through the flow opening 3 and the delivery channel 511 in sequence to the second end of the anti-suction member 5 and enter the downstream side. When the positive pressure state ends, the elastic diaphragm 52 and the elastic valve 512 automatically reset under the action of their own elastic restoring force, returning to their natural closed position.

[0064] Preferably, refer to Figure 3 The first end of the anti-suction body 51 is provided with an abutment ring 513, which is arranged around the outer periphery of the end opening of the conveying channel 511; the abutment part 4 includes a cone 41 protruding in the direction of the anti-suction member 5 and a retaining ring 42 surrounding the outside of the cone 41, and a groove 43 is formed between the retaining ring 42 and the cone 41, and the abutment ring 513 abuts against the bottom of the groove 43.

[0065] Specifically, the abutment ring 513 is an annular protrusion extending axially from the end face of the first end of the anti-suction body 51. Its inner diameter is larger than the end opening diameter of the conveying channel 511, so that the opening of the conveying channel 511 is located in the central region of the abutment ring 513. The cone 41 in the abutment part 4 is a conical structure that gradually tapers towards the anti-suction member 5, and its axis is approximately coincident with the axis of the flow channel 2. The retaining ring 42 is an annular wall surrounding the cone 41, and its inner diameter is larger than the maximum outer diameter of the cone 41, thereby forming an annular groove 43 between the cone 41 and the retaining ring 42. The width of the bottom of the groove 43 is adapted to the thickness of the abutment ring 513, so that the abutment ring 513 can fit precisely into the groove 43 and abut tightly against the bottom of the groove.

[0066] Under natural or negative pressure conditions, the pushing force applied by the elastic diaphragm 52 causes the anti-sucking body 51 to move toward the abutment portion 4. During this process, the cone 41 first contacts the inner side of the abutment ring 513. Since the cone 41 has a gradually contracting slope, it plays a guiding role, automatically guiding the first end of the anti-sucking body 51 to a position coaxial with the abutment portion 4, thus preventing the anti-sucking body 51 from radially shifting after multiple actions.

[0067] Furthermore, the retaining ring 42 restricts the radial displacement of the abutment ring 513 outward. Even if the elastic valve 512 at the second end of the anti-siphon body 51 fails due to long-term use or accidental damage, causing backflow medium to enter the conveying channel 511, the abutment ring 513 remains tightly abutted against the bottom of the slot 43 under the action of the elastic diaphragm 52 (and possibly the effect of negative pressure). The first end of the conveying channel 511 remains sealed. Simultaneously, because the retaining ring 42 radially blocks the abutment ring 513, the backflow medium entering the conveying channel 511 cannot move the anti-siphon body 51 radially, thus preventing the backflow medium from breaking through the sealing structure between the first end of the anti-siphon body 51 and the abutment part 4. This further improves the reliability of the anti-siphon mechanism.

[0068] Specifically, the above plan can be referenced. Figure 3 The anti-absorption body 51 is cylindrical, and the elastic valve 512 is an elastic sheet structure, with its upstream end close to the side wall of the delivery channel 511 and its downstream end close to the axis of the delivery channel 511. The end of the elastic valve 512 (i.e., the downstream end) extends outside the delivery channel 511 so that the convergence point of multiple elastic valves 512 is located outside the delivery channel 511. In this embodiment, there are two elastic valves 512. In other embodiments, the number of elastic valves 512 can be more, such as three, four, etc.

[0069] Specifically, the above plan can be referenced. Figures 1 to 3 The anti-sucking component 5 further includes a fixing ring 53 disposed on the outer periphery of the elastic diaphragm 52. The fixing ring 53 is integrally formed with the elastic diaphragm 52 and the anti-sucking body 51. The thickness of the fixing ring 53 is greater than that of the elastic diaphragm 52.

[0070] The retaining ring 53 is an annular structure located on the outer periphery of the elastic diaphragm 52. Its function is to clamp the valve body 1 to facilitate the installation of the suction stop 5 and to achieve a sealing connection between the outer periphery of the elastic diaphragm 52 and the valve body 1. In practical applications, the valve body 1 is usually composed of multiple parts (such as the upper valve body 1, lower valve body 1, end cap, etc.), and the retaining ring 53 can be clamped at the joints between different parts. To improve installation stability, an annular mounting groove (not marked in the figure) can be provided inside the valve body 1. The size of the mounting groove is adapted to the outer diameter and thickness of the retaining ring 53. After the retaining ring 53 is embedded in the mounting groove, it is pressed and fixed by the various parts of the valve body 1. Since the thickness of the retaining ring 53 is greater than that of the elastic diaphragm 52, it has higher compressive strength and is not easily deformed or damaged under clamping force, thus reliably maintaining its predetermined position. At the same time, the thinner elastic diaphragm 52 maintains good flexibility and can sensitively deform under the action of medium pressure.

[0071] Thus, in this embodiment, the anti-siphon structure, under natural or negative pressure conditions, forms a first seal between the first end of the anti-siphon body 51 and the abutment portion 4 through the pressure applied by the elastic diaphragm 52. Simultaneously, multiple elastic valves 512 at the second end of the anti-siphon body 51 automatically converge to form a second seal. The two seals are independent of each other; even if one seal's sealing performance deteriorates due to impurities, deformation, or other factors, the other seal can still maintain effective blocking, thereby improving the redundancy and overall stability of the anti-siphon system.

[0072] Furthermore, the anti-siphon component 5 is a one-piece molded structure, integrating multiple functional features such as the elastic diaphragm 52, the anti-siphon body 51, and multiple elastic valves 512 into a single component. It can achieve double sealing by engaging with the abutment part 4 within the valve body 1 without assembling multiple independent components. The structure is relatively simple, reducing manufacturing and assembly difficulty. In addition, this anti-siphon structure relies solely on the abutment part 4 and the anti-siphon component 5 in the flow channel 2. Therefore, one or more anti-siphon structures can be conveniently installed in the flow channel 2 of the valve body 1 according to different anti-backflow requirements without significantly increasing the overall complexity, facilitating flexible arrangement within the valve body 1.

[0073] Example 2

[0074] refer to Figures 4 to 8 This paper presents a multi-level protection anti-backflow vacuum breaking device, which includes the anti-siphon structure of Embodiment 1.

[0075] Specifically, the multi-stage protection anti-backflow vacuum disruption device includes a valve body 1, with a flow channel 2 inside the valve body 1. The flow channel 2 includes a medium inlet 21, a medium outlet 22, an air inlet 23, and a cavity 24 where the three meet. An abutment part 4 is provided inside the cavity 24, and the medium inlet 21 is located on the periphery of the abutment part 4. A suction-stopping component 5, a transmission component 6, and a valve core 7 are provided inside the cavity 24. The cavity 24 and the suction-stopping component 5 and the abutment part 4 inside it form the anti-siphon structure.

[0076] The anti-sucking component 5 includes an anti-sucking body 51 and an elastic diaphragm 52 disposed on the outer periphery of the anti-sucking body 51. The outer periphery of the elastic diaphragm 52 is sealed to the valve body 1 to separate the cavity 24. The medium inlet 21 is located on one side of the elastic diaphragm 52, and the medium outlet 22 and air inlet 23 are located on the other side of the elastic diaphragm 52. The elastic diaphragm 52 corresponds axially to the opening position of the medium inlet 21. The anti-sucking body 51 is provided with an axially penetrating conveying channel 511. The first end of the anti-sucking body 51 faces the abutment portion 4, and its second end is provided with multiple elastic valves 512 that can be gathered together.

[0077] The aforementioned medium inlet 21 is equivalent to the flow opening 3 described in Embodiment 1. The working principle of the suction stop 5 can be found in Embodiment 1 and will not be repeated here.

[0078] In this embodiment, the elastic deformation motion of the elastic diaphragm 52 can be transmitted to the valve core 7 through the transmission member 6 to drive the valve core 7 to move.

[0079] Therefore, in either a natural or negative pressure state, the multi-stage protective anti-backflow vacuum breaking device uses the elastic diaphragm 52 to seal the first end of the anti-suction body 51 against the abutment part 4, thus sealing the first end of the conveying channel 511. Furthermore, the elastic valve 512 of the sealing part converges to seal the second end of the conveying channel 511. At this time, the medium inlet 21 and medium outlet 22 are completely blocked by the anti-suction member 5, preventing reverse flow of the medium even if a siphon effect occurs downstream. In addition, since the elastic diaphragm 52 is not pushed by the medium pressure, the transmission member 6 does not apply a thrust to the valve core 7, keeping the valve core 7 away from the air inlet 23, which remains open. This allows external air to enter the cavity 24 through the air inlet 23, disrupting any potential negative pressure environment and further preventing siphon formation.

[0080] In this multi-stage protection anti-backflow vacuum breaking device, under positive pressure, the medium enters from the medium inlet 21 and impacts the elastic diaphragm 52. The medium pressure overcomes the elastic restoring force of the elastic diaphragm 52, causing it to deform away from the contact part 4. This deformation drives the anti-suction body 51 to move, separating its first end from the contact part 4, thereby opening the first end of the conveying channel 511. Simultaneously, the positive medium pressure causes the elastic valve 512 to open outward, opening the second end of the conveying channel 511. The medium can then flow into the cavity 24 from the medium inlet 21 and the conveying channel 511. At the same time, the deformation of the elastic diaphragm 52 is transmitted to the valve core 7 through the transmission member 6, pushing the valve core 7 towards the air inlet 23 until it blocks the air inlet 23, preventing the medium in the cavity 24 from leaking out through the air inlet 23, allowing the medium in the cavity 24 to flow out from the medium outlet 22. When the positive pressure state ends, the elastic diaphragm 52 and elastic valve 512 reset under their own elastic restoring force, the transmission component 6 resets accordingly, the valve core 7 leaves the air inlet 23, the air inlet 23 reopens, and the device returns to its natural state.

[0081] In this embodiment, the multi-level protection anti-backflow vacuum breaking device integrates an anti-siphon structure (which itself has two seals) and an air inlet 23 for air replenishment. Under negative pressure, it simultaneously blocks backflow and breaks the vacuum, forming a multi-level, multi-mechanism protection system that significantly improves the safety margin against backflow.

[0082] Preferably, such as Figure 6 and Figure 7 As shown, the medium inlet 21 and the air inlet 23 are arranged opposite to each other in the cavity 24; the transmission member 6 is a spring, one end of which is sleeved on the outside of the anti-suction body 51 and abuts against the elastic diaphragm 52, and the other end abuts against the valve core 7.

[0083] In this cavity 24, the medium inlet 21 and the air inlet 23 are arranged opposite each other along the same axis, allowing the suction stop 5, the transmission element 6, and the valve core 7 to be arranged in the same straight line. The transmission element 6 is a compression spring or a coil spring. In the natural or negative pressure state, the elastic diaphragm 52 is not pushed by the medium pressure, and the transmission element 6 can be considered as being in an uncompressed natural state. At this time, the valve core 7 does not block the air inlet 23. When the positive pressure state arrives, the medium pressure pushes the elastic diaphragm 52 to deform, and the elastic diaphragm 52 will provide a thrust to the transmission element 6, causing the transmission element 6 and the valve core 7 to move towards the air inlet 23. When the valve core 7 moves to contact the air inlet 23 and forms a blockage, the passage between the cavity 24 and the air inlet 23 is cut off. It should be noted that since the transmission element 6 is a spring, it is compressible. Therefore, if the medium pressure continues to increase and the elastic diaphragm 52 is further deformed when the valve core 7 has already blocked the air inlet 23, the spring can be further compressed, thereby allowing the elastic diaphragm 52 to continue to deform and the valve core 7 to remain blocked.

[0084] Preferably, such as Figure 6 and Figure 7 As shown, the air inlet 23 is provided with a guide structure 8, and the valve core 7 is slidably engaged with the guide structure 8 so that the valve core 7 slides axially.

[0085] The guide structure 8 can be a cylindrical guide hole, a guide sleeve, or several guide ribs extending axially along the air inlet 23. Its inner diameter is adapted to the outer diameter of the valve core 7, allowing the valve core 7 to slide freely along the axial direction of the air inlet 23 without radial wobble or jamming. The guide structure 8 can be integrally formed with the valve body 1. The form of the guide structure 8 can also refer to the prior art CN120466504A.

[0086] Preferably, to improve the sealing between the valve core 7 and the air inlet 23, refer to Figure 6 or Figure 7 The valve core 7 is provided with a sealing gasket 71 to achieve a sealed connection with the air inlet 23. In this way, the valve core 7 contacts the air inlet 23 through the sealing gasket 71, forming a reliable sealing interface.

[0087] Thus, this embodiment realizes the linkage between the anti-siphon structure and the air replenishment function in Embodiment 1.

[0088] Example 3

[0089] refer to Figures 4 to 8 In Example 3, an anti-siphon structure is further provided at the medium inlet 21 based on Example 2.

[0090] Specifically, the medium outlet 22 is disposed on the periphery of an abutment portion 4, and a suction stop 5 is provided behind the medium outlet 22 so that the location of the medium outlet 22 forms the anti-siphon structure.

[0091] The medium outlet 22 is equivalent to the flow opening 3 in Embodiment 1. The working principle of the anti-siphon structure at the medium outlet 22 can be found in Embodiments 1 and 2, and will not be repeated here.

[0092] This embodiment is equivalent to setting up two anti-siphon structures as in Embodiment 1, realizing the series protection of multiple anti-siphon structures inside the device. At the same time, each anti-siphon structure can form two sealing structures. This further increases the reliability of this multi-level protection anti-backflow vacuum destruction device.

[0093] This embodiment also illustrates the flexibility of the anti-siphon structure arrangement in Embodiment 1, enabling it to adapt to application scenarios with different protection levels. It is understood that those skilled in the art can, according to actual protection requirements, set three or more anti-siphon structures in the flow channel 2 of the valve body 1, and are not limited to the two-channel configuration listed in this embodiment. This flexible arrangement reflects the advantages of the anti-siphon structure of this application, namely its simple structure and ease of series integration.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0095] To highlight the key technical aspects of this application, the specification and accompanying drawings omit or omit structural, step, or operational features not directly related to solving the technical problems of this application when describing the embodiments. Such omissions do not affect the understanding of the technical solution of this application by those skilled in the art, nor do they constitute a limitation on the embodiments. Those skilled in the art can supplement or replace relevant content based on conventional technical knowledge without affecting the completeness and feasibility of the technical solution of this application.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anti-siphon structure, characterized in that, include: A flow channel is provided inside the valve body for the flow of medium. The flow channel is provided with an abutment part, and the periphery of the abutment part is provided with a flow opening for the medium to pass through. A suction stop is disposed within the flow channel and located behind the flow opening. The suction stop is made of elastic material and includes a suction stop body and an elastic diaphragm disposed on the outer periphery of the suction stop body. The outer periphery of the elastic diaphragm is sealed to the valve body to separate the flow channel. The elastic diaphragm corresponds to the flow opening in the axial direction. The suction stop body has an axially penetrating conveying channel. The first end of the suction stop body faces the abutment portion, and its second end has multiple elastic valves that can be brought together. Under natural or negative pressure conditions, the elastic diaphragm seals the first end of the anti-sucking body against the abutment portion, thereby sealing the first end of the delivery channel; and the elastic valves of the sealing portion converge to seal the second end of the delivery channel. Under positive pressure, the elastic diaphragm deforms under the medium pressure, causing the first end of the anti-sucking body to separate from the abutting part; and the elastic valve of the sealing plate opens under the medium pressure.

2. The anti-siphon structure according to claim 1, characterized in that: The first end of the anti-suction body is provided with an abutment ring, which is arranged around the outer periphery of the end opening of the conveying channel; The abutting part includes a cone protruding in the direction of the anti-suction member and a retaining ring surrounding the outside of the cone. A groove is formed between the retaining ring and the cone, and the abutting ring abuts against the bottom of the groove.

3. The anti-siphon structure according to claim 1, characterized in that: The anti-absorption body is cylindrical, and there are two elastic valves. The ends of the elastic valves extend outside the delivery channel so that the convergence point of the multiple elastic valves is located outside the delivery channel.

4. The anti-siphon structure according to claim 1, characterized in that: The anti-sucking component also includes a fixing ring disposed on the outer periphery of the elastic diaphragm. The fixing ring, the elastic diaphragm, and the anti-sucking body are integrally formed, and the thickness of the fixing ring is greater than that of the elastic diaphragm.

5. A multi-stage protection anti-backflow vacuum breaking device, characterized in that, It includes the anti-siphon structure as described in any one of claims 1 to 4.

6. The multi-stage protection anti-backflow vacuum destruction device according to claim 5, characterized in that, The valve includes a valve body, which has a flow channel. The flow channel includes a medium inlet, a medium outlet, an air inlet, and a cavity where the three meet. The cavity has an abutment portion, and the medium inlet is located on the periphery of the abutment portion. The cavity has a suction-stopping component, a transmission component, and a valve core. The cavity and the suction-stopping component and the abutment portion inside it form the anti-siphon structure. The anti-suction component includes an anti-suction body and an elastic diaphragm disposed on the outer periphery of the anti-suction body. The outer periphery of the elastic diaphragm is sealed to the valve body to separate the cavity. The medium inlet is located on one side of the elastic diaphragm, and the medium outlet and air inlet are located on the other side of the elastic diaphragm. The elastic diaphragm corresponds axially to the opening position of the medium inlet. The anti-suction body has an axially penetrating conveying channel. The first end of the anti-suction body faces the abutment portion, and its second end has multiple elastic valves that can be converged. The transmission element is used to transmit the elastic deformation motion of the elastic diaphragm to the valve core, so as to drive the valve core to move; Under natural or negative pressure conditions, the elastic diaphragm seals the first end of the anti-suction body against the abutment portion, thereby sealing the first end of the delivery channel; and the elastic valves of the sealing portion converge to seal the second end of the delivery channel; the medium inlet and medium outlet are disconnected, and the air inlet is open; Under positive pressure, the elastic diaphragm deforms under the medium pressure, causing the first end of the anti-suction body to separate from the abutting part, and causing the valve core to block the air inlet; the elastic valve of the sealing plate opens under the medium pressure; the medium inlet and the medium outlet are connected.

7. The multi-stage protection anti-backflow vacuum breaking device according to claim 6, characterized in that: The medium inlet and the air inlet are arranged opposite to each other within the cavity; The transmission component is a spring, one end of which is sleeved on the outside of the anti-suction body and abuts against the elastic diaphragm, and the other end abuts against the valve core.

8. The multi-stage protection anti-backflow vacuum breaking device according to claim 7, characterized in that: The air inlet is provided with a guide structure, and the valve core is slidably engaged with the guide structure so that the valve core slides axially.

9. The multi-stage protection anti-backflow vacuum destruction device according to claim 7, characterized in that: The valve core is equipped with a sealing gasket to achieve a sealed connection with the air inlet.

10. The multi-stage protection anti-backflow vacuum breaking device according to any one of claims 6 to 9, characterized in that: The medium outlet is located on the periphery of an abutment portion, and a suction-stopping element is provided behind the medium outlet so that the location of the medium outlet forms the anti-siphon structure.

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