A vacuum disrupter

Abstract

This utility model relates to the field of intelligent toilet vacuum breaker technology, and more specifically, to a vacuum breaker, including a valve body. The valve body is divided into a water inlet chamber and an installation chamber. A vacuum breaker device is provided at the top of the water inlet chamber. The water inlet chamber and the installation chamber are connected through a water passage hole. The vacuum breaker device is connected to the outside. The installation chamber is provided with a pressure relief pipe, an elastic element, and a first sealing cover. The pressure relief pipe is provided with a pressure relief port. One end of the elastic element abuts against the first sealing cover, and the other end abuts against the end face of the pressure relief port. The first sealing cover seals the water passage hole. This utility model can relieve pressure when the actual pressure of the pipeline exceeds the upper limit of the design pressure, thus preventing the hose from rupturing.

Description

Technical Field

[0001] This utility model relates to the field of toilet technology, and more specifically, to a vacuum breaker. Background Technology

[0002] In modern smart toilet designs, to enhance the user experience, functions such as heated seats, warm water washing, and warm air drying are commonly integrated. These functions rely on a built-in heating system, which typically requires a complex plumbing system to deliver the heated water. To accommodate the limited and irregular installation space inside the toilet and to facilitate on-site assembly and adjustments, designers often prefer flexible and malleable tubing (such as silicone tubing or rubber tubing) as the primary material for the plumbing. This type of tubing is easy to bend and maneuver around obstacles, significantly reducing installation difficulty.

[0003] However, smart toilet water systems face the problem of internal water pressure fluctuations during actual operation. These fluctuations may stem from unstable municipal water supply pressure, the impact of opening and closing the inlet valve, potential vaporization during heating, or abnormal operation of other components. To address this potential pressure instability, a conventional design strategy is to increase the wall thickness of the flexible hose. Typical design standards require the pipe to withstand pressures exceeding twice the normal operating pressure without rupturing, aiming to provide a certain safety margin.

[0004] Although the cost of thicker flexible hoses is not high, under extreme operating conditions or specific malfunctions (such as abnormally high water supply pressure, temperature control system failure leading to excessively high water pressure due to continuous heating, or unexpected blockage in the water system), the actual pressure inside the pipes may still exceed the design pressure limit. If this happens, even thicker flexible hoses may rupture due to the overload, resulting in hot water leakage.

[0005] For example, Chinese patent document CN210716093U discloses a vacuum breaker structure. This breaker mainly includes a main body, an isolation component (with a through hole and a support ring), and a first movable component and a second movable component (the latter with an elastic cover) that can move up and down. Its main function is to prevent unclean water from flowing back and contaminating the water source due to siphoning or negative pressure, but it does not provide an effective active pressure relief or pressure limiting protection mechanism for abnormal increases in positive pressure inside the pipeline. Utility Model Content

[0006] The purpose of this invention is to overcome the problem that existing vacuum breaker devices may cause hot water leakage due to the soft rubber hose rupture under extreme pipeline pressure conditions because it cannot withstand the overload. The invention provides a vacuum breaker that can release pressure when the actual pipeline pressure exceeds the upper limit of the design pressure, thereby preventing the hose from rupturing.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A vacuum breaker is provided, comprising a valve body, the valve body being divided into a water inlet chamber and an installation chamber. A vacuum breaker device is provided at the top of the water inlet chamber. The water inlet chamber and the installation chamber are connected through a water passage hole. The vacuum breaker device is connected to the outside. The installation chamber is provided with a pressure relief pipe, an elastic element, and a first sealing cover. The pressure relief pipe is provided with a pressure relief port. One end of the elastic element abuts against the first sealing cover, and the other end abuts against the end face of the pressure relief port. The first sealing cover seals the water passage hole.

[0008] During the operation of the above scheme, when negative pressure occurs in the water pressure inside the flexible hose connected to the water inlet chamber, the vacuum breaking device activates and draws in the negative pressure from the outside air balancing valve body. When the water pressure inside the flexible hose connected to the water inlet chamber is normal, the pre-tightening force of the elastic element (such as a spring) pushes the first sealing cover tightly against the outer circumferential surface of the water passage, completely sealing the water passage and preventing water from entering the installation chamber. Once the water pressure in the flexible hose and the water inlet chamber rises abnormally and exceeds the set threshold (i.e., the pre-tightening force of the elastic element), the force of the high-pressure water acting on the first sealing cover will overcome the resistance of the elastic element, pushing the first sealing cover to move away from the outer circumferential surface of the water passage, thereby opening the water passage. At this time, the high-pressure water flows into the pressure relief pipe in the installation chamber through the opened water passage and is finally discharged to the outside from the pressure relief port of the pressure relief pipe, realizing automatic pressure relief and effectively preventing the flexible hose from rupturing due to overpressure. When the internal pressure drops back to a safe range, the elastic element pushes the first sealing cover to reset, resealing and closing the water passage, and the device returns to its initial closed state.

[0009] Furthermore, the pressure relief fitting is provided with a pressure relief chamber, which communicates with the outside through the pressure relief port. A cover groove is provided on one side of the first sealing cover. One end of the elastic element is located inside the pressure relief chamber and abuts against the end face of the pressure relief port, while the other end is inserted into the cover groove. The elastic element is a spring, and this design provides precise axial guidance for the compression and tension of the elastic element. When water pressure pushes the first sealing cover to move, the elastic element is constrained between the cover groove and the bottom of the pressure relief chamber, and can only extend and retract along a preset axial direction, effectively preventing the elastic element from bending, twisting, or significantly shifting laterally during operation. This ensures that the movement trajectory of the first sealing cover is straight and perpendicular to the sealing surface, avoiding problems such as incomplete sealing (when closed) or jamming (when open) due to skewness.

[0010] Furthermore, it also includes a sealing ring installed on the first sealing cover. A first sealing protrusion is provided on the outer periphery of the water passage near the first sealing cover, and the sealing ring abuts against the first sealing protrusion. Compared to pressing the sealing ring directly onto the flat outer periphery of the orifice or a wide plane, this protruding structure results in a smaller and more concentrated contact area for the sealing ring. According to the sealing principle, under the same preload (provided by the elastic element), the smaller the contact area, the greater the contact pressure per unit area (sealing specific pressure). A higher sealing specific pressure means a more effective seal, better resistance to water pressure penetration, and a significant reduction in the risk of leakage in the closed state.

[0011] Furthermore, the first sealing cover has an installation protrusion on the side away from the cover groove, and the installation protrusion is inserted into the center hole of the sealing ring; the installation protrusion is directly connected to the center hole of the sealing ring by interference fit to achieve radial fixation of the sealing ring and prevent the sealing ring from sliding under the action of water flow.

[0012] Furthermore, it also includes a water guide component installed inside the valve body. An inlet pipe and an outlet pipe are connected to the side wall of the valve body. The water guide component includes a partition portion and a filter cartridge portion. The partition portion seals against the inner wall of the valve body and divides the valve body cavity into an inlet cavity and an installation cavity. A water passage hole is located on the partition portion. The inlet pipe communicates with the annular cavity formed by the inner wall of the valve body and the outer wall of the filter cartridge. The outlet pipe communicates with the cavity inside the filter cartridge. To add a filtration function to the valve body, the water passage hole is located on the partition portion of the water guide component. The side wall of the filter cartridge portion is configured as a filter screen. Water enters the inlet cavity from the inlet pipe on the side wall of the valve body. The filter screen filters impurities in the water, which are blocked within the space formed by the filter screen and the inner wall of the inlet cavity, thus achieving a filtration effect.

[0013] Furthermore, the outer wall of the filter cartridge is provided with a protrusion, and the wall of the water inlet chamber is provided with a step. The protrusion and the step are sealed together. The first function of the protrusion is to abut against the step to realize the axial limitation of the entire water guide, preventing the water guide from moving upward under the buoyancy of the water. The second function is to form a closed annular impurity storage space together with the baffle, so as to prevent impurities from continuing to mix with the filtered water under the action of water flow.

[0014] Furthermore, the valve body is provided with a locking protrusion, and the pressure relief pipe is provided with a buckle, which is connected to the locking protrusion; the pressure relief pipe adopts a detachable connection method with a buckle, so that when the storage space is full of impurities, the pressure relief pipe can be removed, and the water guide can be slid out and the impurities can be cleaned.

[0015] Furthermore, the vacuum breaking device includes a vent pipe and a second sealing cap. The top of the water guide is open, and the second sealing cap abuts against the top of the water guide. When there is a lot of water, the second sealing cap rises under the buoyancy of the water to abut against the top of the valve body, sealing the vent pipe. When there is little water or no water enters, the second sealing cap falls to abut against the top of the water guide, opening the vent pipe and allowing air to enter the valve body. Similarly, when the second sealing cap floats to the point of sealing the vent pipe, if there is negative pressure in the water inlet chamber, external air can push open the second sealing cap through the vent pipe and fill the water inlet chamber to balance the negative pressure.

[0016] Furthermore, the vacuum breaking device also includes a connecting cavity, which connects the cavity of the valve body and the air exchange pipe. The second sealing cover includes a sealing convex ring and a guide post. A second sealing protrusion is provided on the end face of the connecting cavity near the second sealing cover. The diameter of the connecting cavity is larger than the diameter of the guide post and smaller than the outer diameter of the sealing convex ring. The guide post is inserted into the connecting cavity to guide the movement of the second sealing cover. Under the action of the filter cartridge, although large particles of foreign matter in the water have been filtered out, some mucus-like substances may still grow in the water and stick to the second sealing cover. Therefore, a large movement gap should be provided between the guide post and the connecting cavity to ensure that the second sealing cover is not stuck.

[0017] Furthermore, the inlet pipe is located on the side of the valve body closer to the mounting cavity, and the outlet pipe is located on the side of the valve body away from the mounting cavity. The inlet pipe is located below the outlet pipe, and the whole structure adopts a bottom-in, top-out configuration. On the one hand, the inlet pipe and the outlet pipe need to be set on both sides of the stepped part to achieve normal filtration function. On the other hand, the inlet pipe cannot be set above the outlet pipe, otherwise water may flow into the ventilation pipe through the connecting cavity.

[0018] Compared with the prior art, the beneficial effects of this utility model are: 1. The water inlet chamber and the installation chamber are connected through a water passage hole. The installation chamber is equipped with a pressure relief pipe fitting, as well as an elastic element and a first sealing cap. The pressure relief pipe fitting is equipped with a pressure relief port. One end of the elastic element abuts against the first sealing cap, and the other end abuts against the end face of the pressure relief pipe port. The first sealing cap abuts against the outer peripheral surface of the water passage hole and seals the water passage hole. High-pressure water can flow into the pressure relief pipe fitting in the installation chamber through the open water passage hole and finally be discharged to the outside from the pressure relief port of the pressure relief pipe fitting, realizing automatic pressure relief and effectively preventing the soft rubber hose from rupturing due to overpressure.

[0019] 2. The water guiding component includes a baffle section and a filter cartridge section. The outer wall of the filter cartridge section is also provided with a protrusion. The wall of the water inlet chamber is provided with a step section. The protrusion and the step section are sealed together. The protrusion and the baffle section together form a closed annular impurity storage space to achieve the filtration effect of the valve body. Attached Figure Description

[0020] Figure 1 A three-dimensional diagram of a vacuum breaker; Figure 2 An exploded view of a vacuum breaker; Figure 3 This is a top plan view of a vacuum breaker; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 for Figure 3 Cross-sectional view along the BB direction.

[0021] In the attached diagram: 100, valve body; 110, water inlet chamber; 111, stepped portion; 120, mounting cavity; 130, water passage hole; 131, first sealing protrusion; 140, water inlet pipe; 150, water outlet pipe; 160, engaging protrusion; 170, air exchange pipe; 180, connecting cavity; 181, second sealing protrusion; 200, pressure relief fitting; 210, pressure relief port; 220, pressure relief cavity; 230, snap fastener; 300, elastic element; 400, first sealing cover; 410, cover groove; 420, sealing ring; 430, mounting protrusion; 500, water guide element; 510, partition portion; 520, filter cartridge portion; 521, protrusion portion; 600, second sealing cover; 610, sealing protrusion ring; 620, guide post; 700, sealing element. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] Example 1 This embodiment is a first embodiment of a vacuum breaker, such as... Figures 1 to 5As shown, the device includes a valve body 100, which is internally divided into a water inlet chamber 110 and a mounting chamber 120. The top of the water inlet chamber 110 is equipped with a vacuum breaking device. The water inlet chamber 110 and the mounting chamber 120 are connected through a water passage hole 130. The vacuum breaking device is connected to the outside. The mounting chamber 120 is equipped with a pressure relief pipe 200, an elastic element 300, and a first sealing cover 400. The pressure relief pipe 200 is equipped with a pressure relief port 210. One end of the elastic element 300 abuts against the first sealing cover 400, and the other end abuts against the end face of the pressure relief port 210. The first sealing cover 400 closes the water passage hole 130.

[0025] Specifically, the pressure relief fitting 200 is provided with a pressure relief chamber 220, which is connected to the outside through a pressure relief port 210. A cover groove 410 is provided on one side of the first sealing cover 400. One end of the elastic element 300 is located inside the pressure relief chamber 220 and abuts against the end face of the pressure relief port 210, while the other end is inserted into the cover groove 410. The elastic element 300 is a spring, and this design provides precise axial guidance for the compression and tension of the elastic element 300. When water pressure pushes the first sealing cover 400 to move, the elastic element 300 is constrained between the cover groove 410 and the bottom of the pressure relief chamber 220, and can only extend and retract along a preset axial direction, effectively preventing the elastic element 300 from bending, twisting, or significantly shifting laterally during operation. This ensures that the movement trajectory of the first sealing cover 400 is straight and perpendicular to the sealing surface, avoiding problems such as incomplete sealing (when closed) or jamming (when open) due to skewness.

[0026] Specifically, this includes a sealing ring 420 installed on the first sealing cover 400, and a first sealing protrusion 131 provided on the outer periphery of the water passage 130 near the first sealing cover 400, with the sealing ring 420 abutting against the first sealing protrusion 131. Compared to pressing the sealing ring 420 directly onto the flat outer periphery of the orifice or a wide plane, this protruding structure makes the contact area of ​​the sealing ring 420 smaller and more concentrated. According to the sealing principle, under the same preload (provided by the elastic element 300), the smaller the contact area, the greater the contact pressure per unit area (sealing specific pressure). A higher sealing specific pressure means a more effective seal, better resistance to water pressure penetration, and a significant reduction in the risk of leakage in the closed state.

[0027] Specifically, the first sealing cover 400 has a mounting protrusion 430 on the side away from the cover groove 410. The mounting protrusion 430 is inserted into the center hole of the sealing ring 420. The mounting protrusion 430 is directly connected to the center hole of the sealing ring 420 by interference fit to achieve radial fixation of the sealing ring 420 and prevent the sealing ring 420 from sliding under the action of water flow.

[0028] The working principle of a vacuum breaker in this embodiment is as follows: When the water pressure inside the flexible hose of the inlet chamber 110 is normal, the pre-tightening force of the elastic element 300 pushes the sealing ring 420 on the first sealing cover 400 to tightly abut against the first sealing protrusion 131 on the outer peripheral surface of the water passage 130, completely sealing the water passage 130 and preventing water from entering the installation chamber 120. When the water pressure inside the flexible hose and the inlet chamber 110 rises abnormally and exceeds the set threshold (i.e., the pre-tightening force of the elastic element 300), the force of the high-pressure water acting on the first sealing cover 400 overcomes the resistance of the elastic element 300, pushing the first sealing cover 400 to move, causing the sealing ring 420 to disengage from the first sealing protrusion 131, thereby opening the water passage 130; the high-pressure water then flows into the pressure relief chamber 220 of the pressure relief pipe fitting 200 through the opened water passage 130, and is finally discharged to the outside from the pressure relief port 210, realizing automatic pressure relief. Once the internal pressure drops to a safe range, the elastic element 300 pushes the first sealing cover 400 to reset, resealing and closing the water inlet 130, and the device returns to its initial closed state.

[0029] The beneficial effects of this embodiment are: the setting of the elastic element 300 and the first sealing cover 400 can actively open the water passage hole 130 to reduce the pressure and protect the soft rubber tube when the actual pressure of the pipeline exceeds the design pressure limit of the elastic element 300, effectively preventing the soft rubber tube from rupturing due to overpressure.

[0030] Example 2 This embodiment is a second embodiment of a vacuum breaker, such as... Figures 2 to 5 As shown, the difference from Embodiment 1 is as follows: Specifically, it also includes a water guide 500, which is installed inside the valve body 100. An inlet pipe 140 and an outlet pipe 150 are connected to the side wall of the valve body 100. The water guide 500 includes a partition portion 510 and a filter cartridge portion 520. The partition portion 510 seals against the inner wall of the valve body 100 and divides the cavity of the valve body 100 into an inlet chamber 110 and an installation chamber 120. A water passage hole 130 is located on the partition portion 510. The inlet pipe 140 and the inner wall of the valve body 100 are connected to the filter cartridge. The annular cavity formed by the outer wall of the cylinder is connected, and the water outlet pipe 150 is connected to the cavity inside the filter cylinder. In order to add a filtration function in the valve body 100, the water passage hole 130 is set on the partition part 510 of the water guide 500, and the side wall of the filter cylinder part 520 is set as a filter screen. Water enters the water inlet chamber 110 from the water inlet pipe 140 on the side wall of the valve body 100. The filter screen filters the impurities in the water. The impurities are blocked in the space formed by the filter screen and the inner wall of the water inlet chamber 110, thereby achieving the filtration effect.

[0031] Specifically, the outer wall of the filter cartridge 520 is provided with a protrusion 521, and the wall of the water inlet chamber 110 is provided with a step 111. The protrusion 521 and the step 111 are sealed together. The first function of the protrusion 521 is to abut against the step 111 to realize the axial limitation of the entire water guide 500 and prevent the water guide 500 from moving upward under the action of water buoyancy. The second function is to form a closed annular impurity storage space together with the baffle 510 to prevent impurities from continuing to mix with the filtered water under the action of water flow.

[0032] like Figure 4 and 5 As shown, in this embodiment, an annular groove is provided on the outer wall of the partition 510, the outer wall of the pressure relief pipe 200, and the top outer wall of the filter cartridge 520. The sealing member 700 is installed in the groove to achieve the sealing installation of the components.

[0033] Specifically, the valve body 100 is provided with a locking protrusion 160, and the pressure relief pipe fitting 200 is provided with a buckle 230, which is connected to the locking protrusion 160. The pressure relief pipe fitting 200 adopts a detachable connection method with the buckle 230. When the storage space is full of impurities, the pressure relief pipe fitting 200 can be removed, and the water guide 500 can be slid out and the impurities can be cleaned.

[0034] The working principle of a vacuum breaker in this embodiment is as follows: Water first enters the inlet chamber 110 through the inlet pipe 140 on the side wall of the valve body 100. A water guide 500 is installed inside the inlet chamber 110. When the inlet chamber 110 is full of water, under pressure, the water is forced through the filter screen sidewall of the filter cartridge 520. The filter screen acts as a separator, blocking large solid particles (such as silt, scale particles, etc.) in the water outside the filter cartridge 520, specifically in the annular space formed between the filter screen and the inner wall of the inlet chamber 110. The purified water then enters the interior of the filter cartridge 520 and flows to the outlet pipe 150 (when the pressure relief valve is not open, the water passage 130 is sealed by the first sealing cap 400). The protrusion 521 on the outer wall of the filter cartridge 520 tightly abuts and seals against the stepped portion 111 on the wall of the inlet chamber 110. This not only axially fixes the water guide 500, preventing it from moving upwards under the impact of water flow or buoyancy, but also, together with the baffle portion 510, forms a closed annular impurity storage space. This closed space effectively traps impurities blocked by the filter screen, preventing impurities from re-entering the filtered water under subsequent water flow disturbance, ensuring the continuity and stability of the filtration effect. When impurities accumulate to a certain extent and need to be cleaned, the pressure relief pipe 200 can be disassembled by releasing the connection between the clip 230 and the protrusion 160 of the valve body 100. Then, the entire water guide 500 (along with the filter cartridge 520 and the impurities it stores) can be slid out of the valve body 100 for cleaning or maintenance.

[0035] The beneficial effects of this embodiment are as follows: A water guide 500 is installed inside the valve body 100. The water guide 500 includes a baffle portion 510 and a filter cartridge portion 520. The water passage hole 130 is set on the baffle portion 510. The filtration function can be realized without affecting the pressure relief function.

[0036] Example 3 This embodiment is a third embodiment of a vacuum breaker, such as... Figures 2 to 4 As shown, the difference from Example 2 is as follows: Specifically, the vacuum breaking device includes a vent pipe 170 and a second sealing cover 600. The top of the water guide 500 is open, and the second sealing cover 600 abuts against the top of the water guide 500. When there is a lot of water, the second sealing cover 600 rises under the buoyancy of the water to abut against the top of the valve body 100, sealing the vent pipe 170. When there is little water or no water enters, the second sealing cover 600 falls down to abut against the top of the water guide 500, the vent pipe 170 opens, and air can enter the valve body 100. Similarly, when the second sealing cover 600 floats to the state of sealing the vent pipe 170, if there is negative pressure in the water inlet chamber 110, external air can push open the second sealing cover 600 through the vent pipe 170 and fill into the water inlet chamber 110 to balance the negative pressure.

[0037] Specifically, the vacuum breaking device also includes a connecting cavity 180, which connects the cavity of the valve body 100 and the air exchange pipe 170. The second sealing cover 600 includes a sealing protrusion 610 and a guide post 620. A second sealing protrusion 181 is provided on the end face of the connecting cavity 180 near the second sealing cover 600. The diameter of the connecting cavity 180 is larger than the diameter of the guide post 620 and smaller than the outer diameter of the sealing protrusion 610. The guide post 620 is inserted into the connecting cavity 180 to guide the movement of the second sealing cover 600. Under the action of the filter cartridge 520, although large particles of foreign matter in the water have been filtered out, some mucus-like substances may still grow in the water and stick to the second sealing cover 600. Therefore, a large movement gap should be provided between the guide post 620 and the connecting cavity 180 to ensure that the second sealing cover 600 is not stuck.

[0038] Specifically, the inlet pipe 140 is located on the side of the valve body 100 near the mounting cavity 120, and the outlet pipe 150 is located on the side of the valve body 100 away from the mounting cavity 120. The inlet pipe 140 is located below the outlet pipe 150, and the whole adopts the bottom inlet and top outlet method. On the one hand, the inlet pipe 140 and the outlet pipe 150 need to be set on both sides of the step part 111 to achieve normal filtration function. On the other hand, the inlet pipe 140 cannot be set above the outlet pipe 150, otherwise water may rush into the ventilation pipe 170 through the connecting cavity 180.

[0039] The working principle of a vacuum breaker in this embodiment is as follows: When the water inlet chamber 110 is full, the vacuum breaking device is in the closed state. The buoyancy of the water pushes the second sealing cover 600 (its sealing protrusion 610) to float up and tightly abut against the second sealing protrusion 181 of the connecting cavity 180 at the top of the valve body 100, thereby sealing the ventilation pipe 170 and preventing water from rushing into the ventilation pipe 170. When the water volume decreases or there is no water, the second sealing cover 600 falls under the action of gravity and detaches from the second sealing protrusion 181, thereby opening the ventilation pipe 170 and allowing external air to enter the valve body 100. If the water inlet chamber 110 suddenly experiences negative pressure (such as pipeline siphon), the external air pressure can instantly push open the second sealing cover 600, thereby opening the entire vacuum breaking device. Air enters the water inlet chamber 110 through the ventilation pipe 170 and the connecting cavity 180 to balance the negative pressure.

[0040] The beneficial effects of this embodiment are: by using buoyancy to close the ventilation pipe 170, when negative pressure occurs in the water inlet chamber 110, the outside air can easily and instantly push open the second sealing cover 600 to balance the negative pressure, effectively avoiding siphon pollution.

[0041] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A vacuum breaker, comprising a valve body (100), wherein the valve body (100) is internally divided into a water inlet chamber (110) and a mounting chamber (120), a vacuum breaker device is provided at the top of the water inlet chamber (110), the water inlet chamber (110) and the mounting chamber (120) are connected through a water passage (130), and the vacuum breaker device is connected to the outside, characterized in that, The mounting cavity (120) is provided with a pressure relief pipe (200), an elastic element (300) and a first sealing cap (400). The pressure relief pipe (200) is provided with a pressure relief port (210). One end of the elastic element (300) abuts against the first sealing cap (400), and the other end abuts against the end face of the pressure relief port (210). The first sealing cap (400) closes the water passage hole (130).

2. The vacuum breaker according to claim 1, characterized in that, The pressure relief fitting (200) is provided with a pressure relief cavity (220), which is connected to the outside through the pressure relief port (210). The first sealing cover (400) is provided with a cover groove (410) on one side. One end of the elastic member (300) is located in the pressure relief cavity (220) and abuts against the end face of the pressure relief port (210), while the other end is inserted into the cover groove (410).

3. A vacuum breaker according to claim 2, characterized in that, It also includes a sealing ring (420) installed on the first sealing cover (400), and a first sealing protrusion (131) is provided on the outer periphery of the water passage (130) near the first sealing cover (400), and the sealing ring (420) abuts against the first sealing protrusion (131).

4. A vacuum breaker according to claim 3, characterized in that, The first sealing cap (400) has a mounting protrusion (430) on the side away from the cover groove (410), and the mounting protrusion (430) is inserted into the center hole of the sealing ring (420).

5. A vacuum breaker according to claim 1, characterized in that, It also includes a water guide (500), which is installed inside the valve body (100). The side wall of the valve body (100) is connected to an inlet pipe (140) and an outlet pipe (150). The water guide (500) includes a partition part (510) and a filter cartridge part (520). The partition part (510) is sealed against the inner wall of the valve body (100) and divides the cavity of the valve body (100) into the inlet cavity (110) and the mounting cavity (120). The water passage hole (130) is located on the partition part (510). The inlet pipe (140) is connected to the annular cavity formed by the inner wall of the valve body (100) and the outer wall of the filter cartridge part (520). The outlet pipe (150) is connected to the cavity inside the filter cartridge part (520).

6. A vacuum breaker according to claim 5, characterized in that, The outer wall of the filter cartridge (520) is also provided with a protrusion (521), and the wall of the water inlet chamber (110) is provided with a step (111), and the protrusion (521) and the step (111) are sealed together.

7. A vacuum breaker according to any one of claims 1-6, characterized in that, The valve body (100) is provided with a locking protrusion (160), and the pressure relief fitting (200) is provided with a buckle (230), which is connected to the locking protrusion (160).

8. A vacuum breaker according to claim 5, characterized in that, The vacuum breaking device includes an air exchange pipe (170) and a second sealing cover (600). The top of the water guide (500) is open, and the second sealing cover (600) abuts against the top of the water guide (500).

9. A vacuum breaker according to claim 8, characterized in that, The vacuum breaking device further includes a connecting cavity (180), which connects the cavity of the valve body (100) and the air exchange pipe (170). The second sealing cover (600) includes a sealing protrusion (610) and a guide post (620). A second sealing protrusion (181) is provided on the end face of the connecting cavity (180) near the second sealing cover (600). The diameter of the connecting cavity (180) is larger than the diameter of the guide post (620) and smaller than the outer diameter of the sealing protrusion (610).

10. A vacuum breaker according to claim 5, characterized in that, The inlet pipe (140) is located on the side of the valve body (100) closer to the mounting cavity (120), and the outlet pipe (150) is located on the side of the valve body (100) away from the mounting cavity (120).

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