Vacuum-breaking pressure relief valve

Abstract

This utility model discloses a vacuum-breaking pressure relief valve. Through an integrated structural design that combines vacuum breaking and pressure relief functions, it achieves automatic switching between three operating states within a single valve body. The valve body features an upper and lower interconnected structure for the flow chamber and the pressure relief / drainage chamber, creating a spatially isolated yet controllably connected layout between the water flow channel and the air channel. The lifting and lowering movement of the first valve core within the pressure relief / drainage chamber controls the opening and closing of the flow gap, and its built-in air passage forms an air compensation pathway during vacuum breaking. The second valve core employs an upper and lower valve plate linkage structure. A rigid connection via the valve stem enables the upper valve plate to open and close the air passage in reverse, while the lower valve plate opens and closes the water inlet, ensuring complete water flow cut-off and air passage opening during vacuum breaking. In the switching mechanism of the three operating states, the pressure relief state achieves coordinated action of the two valve cores through the mechanical linkage of the second valve core lifting the first valve core, rapidly establishing a pressure relief channel while maintaining normal water flow.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief valve technology, and in particular to a pressure relief valve that can break a vacuum. Background Technology

[0002] The function of a pressure relief valve is to ensure that the water pressure does not exceed the rated value, thereby protecting the various components connected in the water circuit from damage due to excessive water pressure. As consumers place increasing emphasis on quality of life, smart bathroom products are entering more and more homes. Smart toilets, as a typical example, are becoming increasingly popular in homes due to their health, comfort, and hygiene features. The water circuit inside a smart toilet, which provides the bidet function, is directly connected to the municipal water supply and must be equipped with a vacuum breaker valve. The function of the vacuum breaker valve is to prevent siphoning in the water circuit during water outages. In related technologies, pressure relief valves only have a pressure relief function, while preventing siphoning requires an additional vacuum breaker valve, increasing the space occupied by the water circuit and the installation difficulty. Furthermore, there is a fluid transmission delay between the pressure relief valve and the vacuum breaker valve; when the water pressure suddenly increases, the pressure relief may not be timely, potentially damaging the vacuum breaker valve. Utility Model Content

[0003] The main purpose of this invention is to propose a pressure relief valve that can break a vacuum, aiming to solve the technical problems of how to reduce the space occupied by the water circuit in which the pressure relief valve is applied and the difficulty of installation, as well as the stability of the vacuum breaking function.

[0004] To achieve the above objectives, the vacuum-breaking pressure relief valve proposed in this utility model includes:

[0005] The valve body includes an inlet, an outlet, a shared inlet for vacuum breaking air intake and pressure relief water outlet, a flow passage, and a pressure relief drain chamber. The pressure relief drain chamber is located above the flow passage and is connected to it. The connection between the pressure relief drain chamber and the flow passage forms a communication port. The inlet is connected to the bottom of the flow passage, the shared inlet for vacuum breaking air intake and pressure relief water outlet is connected to the top of the pressure relief drain chamber, and the outlet is connected to the flow passage. The height of the outlet is located between the inlet and the communication port.

[0006] A first valve core is vertically mounted in the pressure relief drain chamber. The first valve core has a first position and a second position on its vertical path. When the first valve core is in the first position, the lower end of the first valve core abuts against the periphery of the communication port. When the first valve core is in the second position, a flow gap is formed between the lower end of the first valve core and the periphery of the communication port. The flow gap is used to allow water to flow from the flow chamber to the pressure relief drain chamber.

[0007] The first valve core is provided with an air passage that runs through the upper and lower ends of the first valve core, so that air entering the pressure relief drain chamber from the common inlet of the vacuum break air intake and the pressure relief water outlet can flow to the flow chamber through the air passage;

[0008] The second valve core is vertically and flexibly installed in the flow chamber. The second valve core includes an upper valve plate, a lower valve plate, and a valve stem. The upper and lower valve plates are respectively connected to the upper and lower ends of the valve stem. The upper valve plate is used to open or block the air passage, and the lower valve plate is used to open or block the water inlet. When the upper valve plate opens the air passage, the lower valve plate blocks the water inlet; when the upper valve plate blocks the air passage, the lower valve plate opens the water inlet.

[0009] The vacuum-breaking pressure relief valve has a vacuum-breaking state, a conduction state, and a pressure-relieving state;

[0010] In the vacuum-breaking state, the upper valve plate opens the gas passage, and the first valve core blocks the flow gap;

[0011] In the conducting state, the lower valve plate opens the water inlet, the upper valve plate blocks the air passage, and the first valve core blocks the flow gap;

[0012] In the depressurization state, the lower valve plate opens the water inlet, the upper valve plate blocks the air passage, and the second valve core lifts the first valve core so that the first valve core opens the flow gap.

[0013] Optionally, the width of the connecting port is smaller than the width of the pressure relief drainage chamber, and an annular boss is provided at the lower end of the outer peripheral wall of the first valve core. When the first valve core is in the first position, the annular boss abuts against the periphery of the connecting port to block the flow gap; when the first valve core is in the second position, the annular boss moves upward away from the periphery of the connecting port to open the flow gap.

[0014] Optionally, the vacuum-breaking pressure relief valve further includes a pressure relief spring, which is sleeved on the first valve core. One end of the pressure relief spring abuts against or is connected to the annular boss, and the other end abuts against or is connected to the inner wall of the valve body. The pressure relief spring is used to reset the first valve core from the second position to the first position.

[0015] Optionally, the vacuum-breaking pressure relief valve further includes a first sealing ring, which is sleeved on the first valve core and located below the annular boss. When the first valve core is in the first position, the first sealing ring abuts against the periphery of the communication port.

[0016] Optionally, the periphery of the communication port is provided with an annular sealing rib protruding towards the pressure relief drainage cavity, and when the first valve core is in the first position, the first sealing ring abuts against the sealing rib.

[0017] Optionally, the upper surface of the upper valve plate is provided with a first guide member, which is slidably engaged with the air passage, and the cross-section of the first guide member is smaller than the cross-section of the air passage.

[0018] Optionally, the vacuum-breaking pressure relief valve further includes a second sealing ring, which is connected to the upper surface of the upper valve plate. When the upper valve plate blocks the air passage, the second sealing ring seals the gap between the upper valve plate and the air passage.

[0019] Optionally, a second guide is provided on the lower surface of the lower valve plate, the second guide being slidably engaged with the water inlet, and the cross-section of the second guide being smaller than the cross-section of the water inlet.

[0020] Optionally, an annular support boss is provided between the water inlet and the flow chamber. The support boss is provided with an annular support rib. The support rib has a flow notch. When the vacuum-breaking pressure relief valve is in the vacuum-breaking state, the lower valve plate abuts against the support rib. The flow notch connects the water inlet and the flow chamber so that air from the vacuum-breaking air intake and pressure relief water outlet can flow to the water inlet.

[0021] Optionally, the bottom end of the first valve core is provided with a guide rib protruding downwards, and the guide rib is slidably engaged with the flow cavity.

[0022] This utility model's vacuum-breaking pressure relief valve integrates vacuum breaking and pressure relief functions into a single structure, enabling automatic switching between three operating states within a single valve body. The valve body features an upper and lower interconnected flow chamber and pressure relief / drainage chamber, creating a spatially isolated yet controllably connected layout between the water flow channel and the air channel. The lifting and lowering movement of the first valve core within the pressure relief / drainage chamber controls the opening and closing of the flow gap, and its built-in air passage forms an air compensation pathway during vacuum breaking. The second valve core employs an upper and lower valve plate linkage structure, with a rigid valve stem connection enabling the upper valve plate to open and close the air passage while the lower valve plate opens and closes the water inlet, creating a reverse linkage that ensures complete water flow cut-off and air passage opening during vacuum breaking. In the switching mechanism of the three operating states, the pressure relief state utilizes the mechanical linkage of the second valve core lifting the first valve core to achieve coordinated action of the two valve cores, rapidly establishing a pressure relief channel while maintaining normal water flow. The outlet is positioned at a height between the inlet and the connecting port, creating physical isolation for water level control and preventing backflow during siphoning. This structure integrates pressure relief and vacuum breaking functions within a single valve body through a combination of mechanical linkage and spatial layout. This reduces the space occupied by the water circuit in the pressure relief valve and the installation difficulty, while improving the stability of the vacuum breaking function. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the vacuum-breaking pressure relief valve of this utility model;

[0025] Figure 2 This is a cross-sectional view of the vacuum-breaking pressure relief valve of this utility model in a vacuum-breaking state;

[0026] Figure 3 This is a cross-sectional view of the vacuum-breaking pressure relief valve of this utility model in the conducting state;

[0027] Figure 4 This is a cross-sectional view of the vacuum-breaking pressure relief valve of this utility model in the pressure relief state;

[0028] Figure 5 This is an exploded view of an embodiment of the vacuum-breaking pressure relief valve of this utility model;

[0029] Figure 6 This is a structural cutaway view of an embodiment of the vacuum-breaking pressure relief valve of this utility model;

[0030] Figure 7 This is a structural cross-sectional view of another embodiment of the vacuum-breaking pressure relief valve of this utility model.

[0031] Explanation of icon numbers:

[0032]

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text is to include three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] This invention proposes a pressure relief valve capable of breaking vacuum, aiming to solve the technical problems of how to reduce the space occupied by the water circuit in which the pressure relief valve is applied and the difficulty of installation, as well as maintaining the stability of the vacuum breaking function.

[0038] In the embodiments of this utility model, such as Figures 1 to 6As shown, the vacuum-breaking pressure relief valve includes: a valve body 10, which has an inlet 11, an outlet 12, a shared inlet 13 for vacuum breaking air intake and pressure relief water outlet, a flow chamber 14, and a pressure relief drain chamber 15. The pressure relief drain chamber 15 is located above the flow chamber 14 and is connected to the flow chamber 14. The connection between the pressure relief drain chamber 15 and the flow chamber 14 forms a connecting port 16. The inlet 11 is connected to the bottom end of the flow chamber 14, and the outlet 12 is connected to the flow chamber 14. The height of the outlet 12 is located between the inlet 11 and the connecting port 16.

[0039] A first valve core 20 is movably mounted in the pressure relief drain chamber 15. The first valve core 20 has a first position and a second position on its lifting path. When the first valve core 20 is in the first position, the lower end of the first valve core 20 abuts against the periphery of the connecting port 16. When the first valve core 20 is in the second position, a flow gap 21 is formed between the lower end of the first valve core 20 and the periphery of the connecting port 16. The flow gap 21 is used to allow water to flow from the flow chamber 14 to the pressure relief drain chamber 15.

[0040] The first valve core 20 is provided with an air passage 22, which passes through the upper and lower ends of the first valve core 20 so that air entering the pressure relief and drainage chamber 15 from the vacuum breaking air inlet 13 can flow through the air passage 22 to the flow chamber 14.

[0041] The second valve core 30 is vertically mounted in the flow chamber 14. The second valve core 30 includes an upper valve plate 31, a lower valve plate 32, and a valve stem 33. The upper valve plate 31 and the lower valve plate 32 are respectively connected to the upper and lower ends of the valve stem 33. The upper valve plate 31 is used to open or block the air passage 22, and the lower valve plate 32 is used to open or block the water inlet 11. When the upper valve plate 31 opens the air passage 22, or when the upper valve plate 31 blocks the air passage 22, the lower valve plate 32 opens the water inlet 11.

[0042] The vacuum-breaking pressure relief valve has a vacuum-breaking state, a conducting state, and a pressure-relieving state. In the vacuum-breaking state, when the water inlet 11 stops supplying water, the water pressure decreases or even becomes negative. At this time, the second valve core 30 moves downward under the action of gravity or negative pressure. The upper valve plate 31 opens the air passage 22, and the first valve core 20 blocks the flow gap 21 under the action of the pressure relief spring 40. In the conducting state, when water enters the water inlet 11, the second valve core 30 will move upward under the action of water pressure. The lower valve plate 32 opens the water inlet 11, the upper valve plate 31 blocks the air passage 22, and the first valve core 20 blocks the flow gap 21. In the depressurization state, when the water pressure in the water inlet 11 is higher than the normal working water pressure and reaches the pressure value of the pressure relief spring 40, the lower valve plate 32 opens the water inlet 11, the upper valve plate 31 blocks the air passage 22, and the second valve core 30 lifts the first valve core 20 so that the first valve core 20 opens the flow gap 21.

[0043] It should be noted that in this embodiment, the vacuum breaking inlet 13 and the pressure relief outlet 13 are the same opening, serving different functions under different operating states of the pressure relief valve. In the vacuum breaking state, this opening acts as the vacuum breaking inlet 13 to allow airflow in. In the pressure relief state, this opening acts as the pressure relief outlet 13 to allow water to flow out.

[0044] In this embodiment, the flow passage 14 refers to the chamber structure for water supply, and the pressure relief drainage chamber 15 is the chamber structure for guiding the pressure-relieved water flow to the outlet 12 during pressure relief. Specifically, it can be implemented by setting an enlarged cavity structure above the flow passage 14, forming a fluid interaction space with the flow passage 14 through the connecting port 16. The height position of the outlet 12 refers to the vertical positioning of the water channel on the valve body. Specifically, it can be set above the inlet 11 and below the connecting port 16, forming a water level isolation barrier through the physical height difference. The lifting and lowering movement of the first valve core 20 refers to the displacement movement along the axial direction of the pressure relief drainage chamber 15, controlling the opening and closing state of the flow gap 21 through position changes. The air passage 22 refers to the fluid passage penetrating the valve core, specifically implemented by an axial through-hole structure, forming an air compensation path in the vacuum breaking state. The linkage structure of the second valve core 30 refers to a mechanical device in which the upper and lower valve plates move in opposite directions through the rigid valve stem 33. The weight of the second valve core 30 should be controlled within a preset range. If the weight of the second valve core 30 is too large, it will be difficult to lift the second valve core 30 upward to open the inlet 11 when the inlet water pressure is low, and the upper valve plate 31 will also be difficult to effectively block the air passage 22, which may easily lead to leakage at the pressure relief outlet 13. The alternating opening and closing of the inlet 11 and the air passage 22 is achieved through displacement synchronization. The vacuum breaking state refers to the operating mode to prevent the siphon effect. The combined action of the lower valve plate 32 closing the inlet 11 and the upper valve plate 31 opening the air passage 22 cuts off the water flow and introduces atmospheric pressure to balance the negative pressure in the pipeline. The pressure relief state refers to the operating mode to release overpressure. The second valve core 30 lifts the first valve core 20 to form a flow gap 21, allowing high-pressure water to flow out through the pressure relief drain chamber 15 and the pressure relief outlet 13 to achieve pressure release.

[0045] Through the coordinated design of the dual-valve-core linkage structure and the chamber spatial layout, three functions—vacuum breaking, normal water flow, and overpressure relief—are integrated within a single valve body. The inlet 11 and the air passage 22 are synchronously controlled by the reverse movements of the upper and lower valve plates of the second valve core 30. Combined with the flow gap 21 formed by the lifting of the first valve core 20, a mechanical linkage state switching mechanism is constructed. The intermediate height of the outlet 12, in conjunction with the spatial position of the connecting port 16, forms a physical water level isolation layer, effectively blocking the conditions for the siphon effect. This structure achieves an organic unity of pressure protection and vacuum breaking functions while maintaining a compact volume.

[0046] Through an integrated structural design that combines vacuum breaking and pressure relief functions, three operating states can be automatically switched within a single valve body. The valve body 10 features a vertically connected structure between the flow chamber 14 and the pressure relief / drainage chamber 15, creating a spatially isolated yet controllably connected layout between the water flow channel and the air channel. In the pressure relief state, the lifting and lowering movement of the first valve core 20 within the pressure relief / drainage chamber 15 controls the opening and closing of the flow gap 21. In the vacuum breaking state, the air passage 22 built into the second valve core 20 forms an air compensation path during vacuum breaking. The second valve core 30 employs an upper and lower valve plate linkage structure, with the upper valve plate 31 rigidly connected to the valve stem 33 to open and close the air passage 22.

[0047] Under vacuum breaking conditions, the upper valve plate 31 opens the air passage 22, and the first valve core 20 seals the flow gap 21. At this time, external air can enter the pressure relief and drainage chamber 15 through the vacuum breaking air inlet 13, and then flow to the flow chamber 14 through the air passage 22 of the first valve core 20, thereby breaking the vacuum state in the water system and preventing siphoning.

[0048] In the conducting state, the lower valve plate 32 opens the water inlet 11, the upper valve plate 31 blocks the air passage 22, and the first valve core 20 blocks the flow gap 21. Water can enter the flow chamber 14 from the water inlet 11 and then flow out through the water outlet 12, realizing the normal water flow conduction function.

[0049] In the depressurized state, the lower valve plate 32 opens the inlet 11, the upper valve plate 31 blocks the air passage 22, and the second valve core 30 lifts the first valve core 20, causing the first valve core 20 to open the flow gap 21. When the water pressure is too high, the water can flow through the open flow gap 21 from the flow chamber 14 to the pressure relief drain chamber 15, and then be discharged through the pressure relief outlet 13, thus achieving the depressurization function.

[0050] The outlet 12 is positioned at a height between the inlet 11 and the connecting port 16, forming a physical isolation condition for water level control and preventing backflow when siphoning occurs. This structure, through the coordination of mechanical linkage and spatial layout, integrates the dual functions of pressure release and vacuum disruption within a single valve body.

[0051] The above solution integrates pressure relief and vacuum breaking functions into a single valve body, solving the problems of large space occupation, complex installation, and untimely pressure relief caused by traditional split designs. Through ingenious structural design and mechanical linkage mechanism, this solution ensures rapid switching and precise control of the three states: vacuum breaking, conduction, and pressure relief. By eliminating fluid transmission delays between split structures, the pressure relief response speed is significantly improved, effectively preventing potential damage to the system from sudden increases in water pressure. Simultaneously, the special positioning of outlet 12 forms a water level isolation barrier, further enhancing anti-siphon capability. This integrated design not only simplifies the water system structure and reduces installation difficulty but also improves the overall reliability and safety of the system.

[0052] For example, such as Figure 2 , Figure 6 and Figure 7 As shown, an annular support boss 17 is provided between the inlet 11 and the flow chamber 14. The support boss 17 has an annular support rib 171 protruding from it, and the support rib has a flow notch 172. When the vacuum-breaking pressure relief valve is in the vacuum-breaking state, the lower valve plate 32 abuts against the support rib 171, and the flow notch 172 connects the inlet 11 and the flow chamber 14, so that air from the vacuum-breaking air inlet 13 can flow to the inlet 11. Thus, in the vacuum-breaking state, the air flowing into the pressure relief valve from the vacuum-breaking air inlet 13 can flow to both the inlet 11 and the outlet 12, thereby simultaneously breaking the vacuum in the water path upstream and downstream of the pressure relief valve.

[0053] Specifically, such as Figure 6 As shown, the width of the connecting port 16 is smaller than the width of the pressure relief drainage chamber 15. The lower end of the outer peripheral wall of the first valve core 20 is provided with an annular boss 23. When the first valve core 20 is in the first position, the annular boss 23 abuts against the periphery of the connecting port 16 and blocks the flow gap 21 under the action of the first sealing ring 51. When the first valve core 20 is in the second position, the annular boss 23 moves upward away from the periphery of the connecting port 16 to open the flow gap 21.

[0054] When the first valve core 20 is in the first position, the annular boss 23 achieves a seal by contacting the plane around the periphery of the connecting port 16 through the first sealing ring 51 on its bottom surface. At this time, the pressure relief drainage chamber 15 is completely isolated from the flow chamber 14. Since the width of the connecting port 16 is smaller than that of the pressure relief drainage chamber 15, the coverage area of ​​the annular boss 23 and the first sealing ring 51 can completely enclose the edge area of ​​the connecting port 16, avoiding sealing failure due to dimensional deviation.

[0055] When the water pressure pushes the first valve core 20 to the second position, the annular boss 23 disengages from the periphery of the connecting port 16, and the maximum height of the resulting flow gap 21 is 0.5-2mm, for example, 1mm.

[0056] The annular boss 23 is integrally molded with the first valve core 20, and the material can be a wear-resistant engineering plastic. The cross-section of the annular boss 23 can be designed as rectangular or trapezoidal to increase the contact area with the periphery of the communication port 16. The lifting stroke of the first valve core 20 can be adjusted according to actual needs to ensure that the annular boss 23 can completely disengage from the periphery of the communication port 16.

[0057] Through the above technical solution, the first valve core 20 achieves precise sealing of the connecting port 16. The design of the annular boss 23 increases the contact area between the first valve core 20 and the periphery of the connecting port 16, improving the sealing effect. When the first valve core 20 is in the first position, the annular boss 23 can completely cover the periphery of the connecting port 16 through the first sealing ring 51, effectively isolating the flow chamber 14 from the pressure relief drainage chamber 15. When the first valve core 20 rises to the second position, the annular boss 23 completely disengages from the periphery of the connecting port 16, forming a uniform flow gap 21, ensuring stable water flow. This structural design not only strengthens the contact strength of the sealing interface but also improves the stability of the valve core movement through the geometry of the boss, thereby achieving more precise fluid control when switching between pressure relief and vacuum breaking states, and improving the reliability of the pressure relief valve in the vacuum breaking state.

[0058] When the water pressure decreases and the pressure relief state ends, the first valve core 20 can be reset from the second position to the first position under the action of the pressure relief spring 40, or it can be reset from the second position to the first position under the action of the reset structure.

[0059] In practical applications, such as Figures 2 to 6 As shown, the vacuum-breaking pressure relief valve also includes a pressure relief spring 40, which is sleeved on the first valve core 20. One end of the pressure relief spring 40 abuts against or is connected to the annular boss 23, and the other end abuts against or is connected to the inner wall of the valve body 10. The pressure relief spring 40 is used to reset the first valve core 20 from the second position to the first position.

[0060] The pressure relief spring 40 is configured as an annular structure surrounding the outer periphery of the first valve core 20, such as a spring or elastic rubber ring. One end is fixed to the upper surface of the annular boss 23, and the other end contacts the inner wall of the valve body 10 at the top of the pressure relief drain chamber 15, for example, by means of a groove or a limiting protrusion to achieve axial constraint.

[0061] After the pressure relief state ends, the pressure relief spring 40 releases its stored elastic potential energy, driving the first valve core 20 to move axially downwards through the reaction forces acting on the annular boss 23 and the inner wall of the valve body 10 at both ends. During the reset process, the compression deformation of the pressure relief spring 40 decreases linearly with the displacement of the first valve core 20, and the spring compression returns to the initial pre-compression state. Since the pressure relief spring 40 acts directly on the annular boss 23, the reset force transmission path avoids the sliding gap between the first valve core 20 and the valve body 10, and the force transmission efficiency can be improved to over 90%.

[0062] Through the above technical solution, reliable reset of the first valve core 20 is achieved. The design of the pressure relief spring 40 sleeved on the first valve core 20 ensures direct transmission of the reset force and avoids force transmission loss caused by structural gaps. One end of the pressure relief spring 40 acts on the annular boss 23, so that the reset force is precisely applied to the key sealing part of the first valve core 20, and the other end is fixed to the inner wall of the valve body 10, forming a stable supporting reaction force. Thus, after the pressure relief state ends, the first valve core 20 can quickly return from the second position to the first position, ensuring the sealing reliability of the pressure relief valve under non-pressure relief conditions, while improving the response efficiency of the reset action.

[0063] For example, such as Figures 4 to 6 As shown, the vacuum-breaking pressure relief valve also includes a first sealing ring 51, which is sleeved on the first valve core 20 and located below the annular boss 23. When the first valve core 20 is in the first position, the first sealing ring 51 abuts against the periphery of the communication port 16.

[0064] The first sealing ring 51 is made of an elastic material, such as rubber or silicone. Its inner diameter forms an interference fit with the outer peripheral wall of the first valve core 20, and its outer diameter can cover the contact area around the periphery of the communication port 16. When the first valve core 20 is in the first position, the first sealing ring 51 is deformed under pressure and forms a seal with the periphery of the communication port 16.

[0065] When the pressure relief valve is in a vacuum-breaking or conducting state, the first valve core 20 is in the first position under the action of fluid pressure or the pressure relief spring 40. At this time, the mechanical contact between the annular boss 23 and the periphery of the connecting port 16 prevents fluid from passing through the flow gap 21, while the force exerted by the pressure relief spring 40 on the first sealing ring 51 is greater than the pressure of the water flow, so that the first sealing ring 51 tightly fits the annular sealing surface around the periphery of the connecting port 16. During the pressure relief state switching process, the first valve core 20 is lifted to the second position, and the first sealing ring 51 rises synchronously with the valve core and disengages from the connecting port 16. At this time, the flow gap 21 is fully opened, and the fluid can be discharged through the pressure relief drain chamber 15. Since the first sealing ring 51 is always fitted on the outer periphery of the valve core, its rising and falling trajectory remains coaxial with the valve core axis, avoiding sealing failure caused by uneven wear.

[0066] A first sealing ring 51 is added below the annular boss 23 of the first valve core 20, forming a double sealing mechanism. This design effectively compensates for the leakage problems caused by small gaps or surface unevenness that may exist when relying solely on the mechanical contact of the annular boss 23. The tight contact between the first sealing ring 51 and the periphery of the connecting port 16 significantly improves the sealing performance between the pressure relief drainage chamber 15 and the flow chamber 14. This improvement ensures the functional stability when switching between vacuum breaking and pressure relief states, prevents leakage between the pressure relief drainage chamber 15 and the flow chamber 14, and thus improves the reliability of the vacuum breaking or pressure relief function. At the same time, the layout of the first sealing ring 51 below the annular boss 23 does not interfere with the lifting and lowering movement of the first valve core 20, and makes full use of the contact surface around the periphery of the connecting port 16, enhancing the durability and pressure resistance of the sealing effect.

[0067] Specifically, such as Figures 4 to 6 As shown, the periphery of the connecting port 16 is provided with an annular sealing rib 161 protruding towards the pressure relief drainage chamber 15. When the first valve core 20 is in the first position, the first sealing ring 51 abuts against the sealing rib 161.

[0068] The height of the annular protrusion of the sealing rib 161 can be in the range of 0.5-1.5 mm, and the width can be in the range of 0.3-1.0 mm. The cross-sectional shape of the sealing rib 161 can be semi-circular or trapezoidal. The contact surface between the sealing rib 161 and the first sealing ring 51 can be chamfered or rounded, with a chamfer radius not exceeding 0.2 mm. The material hardness of the sealing rib 161 is higher than that of the first sealing ring 51, and the sealing rib 161 is integrally formed with the housing 10. When the first valve core 20 is impacted by water flow and undergoes lateral displacement, the annular structure of the sealing rib 161 restricts the radial displacement of the first sealing ring 51, concentrating its deformation area within the protrusion range of the sealing rib 161. The annular trajectory of the sealing rib 161 is coaxially arranged with the axis of the pressure relief spring 40, and the direction of the restoring force of the pressure relief spring 40 is perpendicular to the contact surface of the sealing rib 161.

[0069] When the first valve core 20 is in the first position, the first sealing ring 51 is subjected to the axial pressure of the annular boss 23, resulting in radial expansion deformation and pressing the sealing rib 161. When the second valve core 30 pushes up the first valve core 20, the separation process between the sealing rib 161 and the first sealing ring 51 proceeds synchronously along the annular trajectory, preventing the sealing ring from twisting due to unilateral separation. The annular protrusion of the sealing rib 161 also serves as a deformation limiting structure for the first sealing ring 51, restricting permanent deformation caused by excessive compression.

[0070] Through the above technical solution, line contact or partial surface contact is achieved between the first sealing ring 51 and the sealing rib 161. Compared with the planar peripheral structure, the protruding design of the sealing rib 161 can concentrate the contact pressure, forcing the first sealing ring 51 to produce sufficient elastic deformation. When the first sealing ring 51 abuts against the sealing rib 161, the pressure area is limited to the annular protrusion range of the sealing rib 161, and the pressure on the contact surface is significantly increased, thereby effectively eliminating the risk of local sealing failure caused by planar contact. The annular structure of the sealing rib 161 also ensures that the first sealing ring 51 always maintains a dynamic seal with the sealing rib 161 along the same circumferential trajectory during the different position changes of the first valve core 20, avoiding the problem of uneven sealing caused by valve core misalignment. Therefore, this application improves the reliability and stability of the seal and enhances the overall performance of the pressure relief valve.

[0071] For example, such as Figure 5 and Figure 6 As shown, the upper surface of the upper valve plate 31 is provided with a first guide member 34, which is slidably engaged with the air passage 22. The cross-section of the first guide member 34 is smaller than the cross-section of the air passage 22.

[0072] The cross-sectional dimension of the first guide member 34 can be set to a circle or a regular polygon. The first guide member 34 is embedded inside the air passage 22 through a protruding structure, and the two form a clearance fit. This clearance allows fluid to pass through while limiting the lateral displacement of the upper valve plate 31 through geometric constraints. The length of the first guide member 34 can cover 50%-80% of the height of the air passage 22 to ensure the stability of the guiding stroke.

[0073] When the second valve core 30 moves up and down, the first guide member 34 slides along the inner wall of the air passage 22, eliminating lateral offset through clearance fit. In the vacuum-breaking state, the second valve core 30 descends, causing the second sealing ring 52 above the upper valve plate 31 to disengage from the sealing surface of the first valve core 20, thus opening the air passage 22. The first guide member 34 remains partially embedded, ensuring the linearity of the reset action. Fluid can flow continuously through the annular gap, avoiding localized pressure buildup. This structure ensures that the contact surfaces of the upper valve plate 31 and the first valve core 20 remain parallel and aligned, and the sealing ring is subjected to uniform pressure, effectively preventing sealing failure due to misalignment. By reducing sliding resistance and maintaining guiding stability, the reliability of valve core operation is improved, and service life is extended.

[0074] Through the above technical solution, precise guidance is achieved during the lifting and lowering process of the second valve core 30. This effectively controls the alignment deviation between the upper valve plate 31 and the air passage 22 of the first valve core 20. Specifically, after the protruding first guide member 34 is embedded in the air passage 22, it restricts the lateral displacement of the upper valve plate 31 through geometric constraints, ensuring that the upper valve plate 31 moves vertically along the axis of the first valve core 20. The annular gap formed between the first guide member 34 and the air passage 22 maintains guiding stability while avoiding increased frictional resistance due to complete contact. Thus, the valve core jamming problem is effectively solved, and the risk of seal failure is greatly reduced. Furthermore, this design balances smooth operation with structural reliability, improving the overall performance and service life of the pressure relief valve.

[0075] Specifically, such as Figure 5 and Figure 6 As shown, the vacuum-breaking pressure relief valve also includes a second sealing ring, which is connected to the upper surface of the upper valve plate 31. When the upper valve plate 31 blocks the air passage 22, the second sealing ring seals the gap between the upper valve plate 31 and the air passage 22.

[0076] The second sealing ring is made of a flexible material, such as nitrile rubber or silicone, and its thickness can be set to the range of 0.5-2 mm. When the upper valve plate 31 moves upward to the blocking position, the second sealing ring is compressed and undergoes radial expansion deformation, and its outer edge forms an interference fit with the inner wall of the air passage 22. During this process, the compression of the sealing ring can be controlled within the range of 20%-40%, which ensures the sealing effect while avoiding excessive deformation that could lead to material fatigue.

[0077] Under depressurization, the second valve core 30 moves upward under water pressure, causing the upper valve plate 31 to contact the air passage 22 of the first valve core 20. At this time, the second sealing ring is squeezed against the inlet edge of the air passage 22, and the reaction force generated by its elastic deformation makes the outer surface of the sealing ring tightly adhere to the inner wall of the passage. Through this structural design, gap sealing is achieved by adding only a single sealing element while maintaining the original valve core lifting function.

[0078] The above technical solution effectively solves the problem of fluid leakage caused by minute gaps between the upper valve plate 31 and the air passage 22 due to machining errors or assembly clearances. The second sealing ring enhances the sealing effect of the upper valve plate 31 when blocking the air passage 22, eliminating potential leakage risks. Therefore, the reliability of the pressure relief valve under pressure relief conditions is significantly improved, ensuring the accuracy and stability of the pressure relief function. Simultaneously, this design does not require changes to the original valve core structure; reliable sealing is achieved simply by adding a flexible sealing element, maintaining structural simplicity and facilitating production and assembly. Furthermore, the elastic properties of the second sealing ring can adapt to pressure changes under different operating conditions, maintaining a long-term stable sealing effect and extending the service life of the pressure relief valve.

[0079] For example, such as Figure 5 and Figure 6 As shown, a second guide 35 is protruding from the lower surface of the lower valve plate 32. The second guide 35 is slidably engaged with the water inlet 11. The cross-section of the second guide 35 is smaller than the cross-section of the water inlet 11.

[0080] The second guide member 35 is constructed as a columnar structure extending downward from the lower surface of the lower valve plate 32, with its axis coinciding with the central axis of the inlet 11. The guide member can be made of engineering plastics with self-lubricating properties, such as polytetrafluoroethylene composite material, and its surface can be provided with axial flow channels to reduce fluid resistance.

[0081] When the second valve core 30 moves up and down, the second guide member 35 first enters the interior of the inlet 11 to form a sliding guide. Through the continuous contact between the outer wall of the guide member and the inner wall of the inlet 11, the movement trajectory of the lower valve plate 32 is forcibly constrained on the axis of the inlet 11. When the valve core assembly is subjected to lateral force, the gap between the guide member and the inlet 11 allows for slight elastic deformation, while the continuous sliding friction of the contact surface eliminates movement deviation. In the closed state, the top of the guide member forms a limiting structure to ensure that the lower valve plate 32 and the sealing surface of the inlet 11 remain in parallel contact.

[0082] The above technical solution effectively solves the sealing failure problem caused by the skewness of the lower valve plate 32 during its movement. The clearance fit between the guide post and the inlet 11 ensures the straightness of the movement trajectory, and the chamfered structure avoids interference during initial assembly. Since the cross-sectional dimension of the second guide member 35 is smaller than that of the inlet 11, it reduces movement resistance while ensuring guiding accuracy, making the lower valve plate 32 move more smoothly and reliably when opening or closing the inlet 11. This design forcibly corrects the movement posture of the lower valve plate 32 through physical limiting, eliminating the swaying phenomenon caused by water flow impact or assembly errors, and significantly improving the service life and sealing performance of the valve core assembly.

[0083] In practical applications, such as Figure 5 and Figure 6 As shown, the bottom end of the first valve core 20 has a downward-facing protruding guide rib 24, which is slidably engaged with the flow cavity 14. The protruding position of the guide rib 24 is limited to the bottom end of the first valve core 20, and its extension direction is consistent with the axial movement trajectory of the valve core. The number of guide ribs 24 can be set to multiple evenly distributed circumferentially, for example, 3-6 ribs. The cross-sectional shape of each guide rib 24 can be rectangular, trapezoidal, or semi-circular, and its height can be controlled within the range of 2-5 mm. The sliding fit clearance between the guide rib 24 and the flow cavity 14 can be set to 0.1-0.3 mm to ensure freedom of movement while avoiding radial wobble.

[0084] When the first valve core 20 moves upward under the pressure of water flow, the guide rib 24 slides along the inner wall of the flow cavity 14, limiting the radial displacement of the valve core through multiple circumferentially distributed contact points. The axial extension structure of the guide rib 24 ensures that when the valve core returns to its downward position under the action of the pressure relief spring 40, the annular boss 23 and the sealing surface of the connecting port 16 remain coaxially aligned. In the pressure relief state, the clearance fit between the guide rib 24 and the flow cavity 14 allows water to enter the pressure relief drain cavity 15 through the channel between the guide ribs 24, avoiding the guide structure from hindering fluid transmission efficiency. Through the synergistic action of the guide rib 24 and the annular boss 23, the valve core maintains a stable trajectory during the lifting and lowering process, ensuring effective sealing surface contact and reliable resetting action.

[0085] Through the above technical solution, precise control of the valve core's movement trajectory is achieved. The fit between the guide rib 24 and the guide groove eliminates the possibility of radial displacement of the valve core, ensuring complete alignment between the annular boss 23 and the sealing surface of the connecting port 16. The guiding effect generated by the sliding fit reduces the contact area between the valve core and the valve body 10, and the frictional resistance is controlled within the effective range of the pressure relief spring 40, thereby improving the smoothness and response speed of the valve core's reset action. The spaced distribution design of the guide ribs 24 maintains the fluid passage cross-section of the flow cavity 14, and the influence of internal pressure fluctuations in the valve body 10 on the valve core's movement trajectory is effectively suppressed.

[0086] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A rupturable vacuum relief valve characterized by, include: The valve body includes an inlet, an outlet, a shared inlet for vacuum breaking air intake and pressure relief water outlet, a flow passage, and a pressure relief drain chamber. The pressure relief drain chamber is located above the flow passage and is connected to it. The connection between the pressure relief drain chamber and the flow passage forms a communication port. The inlet is connected to the bottom of the flow passage, the shared inlet for vacuum breaking air intake and pressure relief water outlet is connected to the top of the pressure relief drain chamber, and the outlet is connected to the flow passage. The height of the outlet is located between the inlet and the communication port. A first valve core is vertically mounted in the pressure relief drain chamber. The first valve core has a first position and a second position on its vertical path. When the first valve core is in the first position, the lower end of the first valve core abuts against the periphery of the communication port. When the first valve core is in the second position, a flow gap is formed between the lower end of the first valve core and the periphery of the communication port. The flow gap is used to allow water to flow from the flow chamber to the pressure relief drain chamber. The first valve core is provided with an air passage that runs through the upper and lower ends of the first valve core, so that air entering the pressure relief drain chamber from the common inlet of the vacuum break air intake and the pressure relief water outlet can flow to the flow chamber through the air passage; The second valve core is vertically mounted in the flow chamber. The second valve core includes an upper valve plate, a lower valve plate, and a valve stem. The upper valve plate and the lower valve plate are respectively connected to the upper and lower ends of the valve stem. The upper valve plate is used to open or block the air passage, and the lower valve plate is used to open or block the water inlet. When the upper valve plate opens the air passage, the lower valve plate blocks the water inlet. When the upper valve plate blocks the air passage, the lower valve plate opens the water inlet; The vacuum-breaking pressure relief valve has a vacuum-breaking state, a conduction state, and a pressure-relieving state; In the vacuum-breaking state, the upper valve plate opens the gas passage, and the first valve core blocks the flow gap; In the conducting state, the lower valve plate opens the water inlet, the upper valve plate blocks the air passage, and the first valve core blocks the flow gap; In the depressurization state, the lower valve plate opens the water inlet, the upper valve plate blocks the air passage, and the second valve core lifts the first valve core so that the first valve core opens the flow gap.

2. The rupturable vacuum relief valve of claim 1, wherein The width of the connecting port is smaller than the width of the pressure relief drainage chamber. An annular boss protrudes from the lower end of the outer peripheral wall of the first valve core. When the first valve core is in the first position, the annular boss abuts against the periphery of the connecting port to block the flow gap. When the first valve core is in the second position, the annular boss moves upward away from the periphery of the connecting port to open the flow gap.

3. The rupturable vacuum relief valve of claim 2, wherein, The vacuum-breaking pressure relief valve also includes a pressure relief spring, which is sleeved on the first valve core. One end of the pressure relief spring abuts against or is connected to the annular boss, and the other end abuts against or is connected to the inner wall of the valve body. The pressure relief spring is used to reset the first valve core from the second position to the first position.

4. The rupturable vacuum relief valve of claim 2, wherein The vacuum-breaking pressure relief valve further includes a first sealing ring, which is sleeved on the first valve core and located below the annular boss. When the first valve core is in the first position, the first sealing ring abuts against the periphery of the communication port.

5. The vacuum-breaking pressure relief valve as described in claim 4, characterized in that, The periphery of the connecting port is provided with an annular sealing rib protruding towards the pressure relief and drainage cavity. When the first valve core is in the first position, the first sealing ring abuts against the sealing rib.

6. The rupturable vacuum relief valve of claim 1, wherein The upper surface of the upper valve plate is provided with a first guide member, which is slidably engaged with the air passage, and the cross-section of the first guide member is smaller than the cross-section of the air passage.

7. The rupturable vacuum relief valve of claim 1, wherein The vacuum-breaking pressure relief valve also includes a second sealing ring, which is connected to the upper surface of the upper valve plate. When the upper valve plate blocks the air passage, the second sealing ring seals the gap between the upper valve plate and the air passage.

8. The rupturable vacuum relief valve of claim 1, wherein, The lower surface of the lower valve plate is provided with a second guide member, which is slidably engaged with the water inlet. The cross-section of the second guide member is smaller than the cross-section of the water inlet.

9. The rupturable vacuum relief valve of claim 1, wherein, An annular support boss is provided between the water inlet and the flow chamber. The support boss has an annular support rib. The support rib has a flow notch. When the vacuum-breaking pressure relief valve is in the vacuum-breaking state, the lower valve plate abuts against the support rib. The flow notch connects the water inlet and the flow chamber so that air from the vacuum-breaking air intake and pressure relief water outlet can flow to the water inlet.

10. The rupturable vacuum relief valve of claim 2, wherein The bottom end of the first valve core is provided with a guide rib protruding downwards, and the guide rib is slidably engaged with the flow cavity.

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