Vacuum breaker device with self-adaptive variable stroke and backflow prevention

Abstract

The invention discloses a vacuum breaker device with a self-adaptive variable stroke and an anti-backflow function, and relates to the technical field of valve switches, the vacuum breaker device comprises a valve body and an anti-siphon assembly, a flow channel, an inlet, an outlet and a supplementary air inlet are formed in the valve body, and the inlet, the outlet and the supplementary air inlet are communicated with the flow channel; the anti-siphon assembly comprises a first sealing core, a second sealing core and an elastic piece, and the first sealing core is connected with the second sealing core through the elastic piece, so that the vacuum breaker device has an initial state, a positive pressure state and a siphon state; in an initial state, the first sealing core blocks the air supplementing inlet, and the second sealing core blocks the inlet; in a positive pressure state, the first sealing core blocks the supplementary air inlet, and the inlet communicates with the outlet; in a siphon state, the second sealing core blocks the inlet, and the supplementary air inlet communicates with the outlet; according to the technical scheme provided by the invention, the structure of the vacuum breaker device can be simplified, and meanwhile, the self-adaptability of the vacuum breaker device under different working conditions is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of valve switches, and in particular to a vacuum breaker device with adaptive variable stroke and backflow prevention. Background Art

[0002] The vacuum breaker device is an important device widely used in water supply and drainage systems, pipeline projects and various fluid conveying systems. Its main function is to prevent the formation of a vacuum state in the system, avoid adverse phenomena such as siphoning, cavitation, pipeline damage and backflow of contaminated media caused by vacuum, which may cause public health accidents and affect the normal operation and safety of the system.

[0003] In the prior art, vacuum breaker devices are usually independent of the valve settings in the system and mostly adopt a fixed opening pressure design. In addition, due to slight leakage during the instantaneous closing of the air replenishment port during the use of the vacuum breaker device, it is necessary to add a guide tube, etc. This is not only not conducive to simplifying the overall structure of the system, but also makes the existing vacuum breaker device unable to meet the complex and changing working conditions, limiting its versatility and applicability in different application scenarios. Summary of the Invention

[0004] The main purpose of the present invention is to provide a vacuum breaker device with adaptive variable stroke and anti-backflow, aiming to simplify the structure of the vacuum breaker device and improve the adaptability of the vacuum breaker device under different working conditions.

[0005] To achieve the above-mentioned object, the vacuum breaker device proposed in the present invention comprises:

[0006] The valve body is provided with a flow channel and an inlet, an outlet and a supplementary air inlet communicating with the flow channel, wherein the inlet and the supplementary air inlet are arranged opposite to each other;

[0007] an anti-siphon assembly, adaptively movable within the flow channel, comprising a first sealing core, a second sealing core, and an elastic member, wherein the first sealing core is connected to the second sealing core via the elastic member, so that the vacuum breaker device has an initial state, a positive pressure state, and a siphon state through an adaptive variable compression stroke characteristic of the elastic member;

[0008] In the initial state, the elastic member is in an extended state, the first sealing core blocks the supplementary air inlet, and the second sealing core blocks the inlet;

[0009] In the positive pressure state, the elastic member is in a compressed state under the action of the medium pressure, the first sealing core blocks the supplementary air inlet, the inlet is opened, and connected to the outlet;

[0010] In the siphon state, under the action of reverse negative pressure, the second sealing core blocks the inlet, and the supplementary air inlet communicates with the outlet.

[0011] In one embodiment, the first sealing core includes a first core shaft and a first limiting portion protruding from the outer circumferential surface of the first core shaft, the second sealing core includes a second core shaft and a second limiting portion protruding from the outer circumferential surface of the second core shaft, and the elastic member is arranged outside the first core shaft and the second core shaft, and its two ends respectively abut the first limiting portion and the second limiting portion.

[0012] In one embodiment, the first core shaft is provided with a movable cavity opening toward the second sealing core, and the second core shaft is movably inserted into the movable cavity;

[0013] And / or, the first sealing core is provided with a side-opening balancing hole penetrating the first core shaft;

[0014] And / or, the elastic member is configured as a spring.

[0015] In one embodiment, the diameter of the supplementary air inlet is not smaller than the diameter of the outlet;

[0016] And / or, a first sealing ring groove for mounting a first sealing gasket is provided on the first limiting portion, and the first sealing gasket is used to seal the supplementary air inlet;

[0017] And / or, a second sealing ring groove for installing a second sealing gasket is provided on the second limiting portion, and the second sealing gasket is used to seal the inlet.

[0018] In one embodiment, a first guide portion is provided on a side of the first limiting portion facing away from the second sealing core, a guide limiting structure is provided in the supplementary air inlet, and the guide limiting structure is provided with a guide limiting hole for the first guide portion to pass through.

[0019] In one embodiment, a limiting step is provided on the first guide portion, and the limiting step abuts against an edge of the guide limiting hole;

[0020] And / or, the guide limiting structure includes a limiting ring and a plurality of connecting arms arranged at intervals along the circumference of the limiting ring, the connecting arms are connected between the inner wall of the supplementary air inlet and the limiting ring, and the inner ring hole of the limiting ring is configured as the guide limiting hole.

[0021] In one embodiment, a second guide portion is provided on a side of the second limiting portion facing away from the first sealing core, and the second guide portion penetrates the inlet; and a through hole connecting the inlet and the outlet is formed in the second guide portion.

[0022] In one embodiment, the second guide portion includes a plurality of ribs arranged at intervals along the circumference of the second limiting portion, and the via hole is configured as a via hole gap between two adjacent ribs and an inner cavity surrounded by each rib.

[0023] In one embodiment, the valve body includes a first shell portion and a second shell portion, the first shell portion is provided with the inlet, the second shell portion is provided with the outlet and the supplementary air inlet, and the first shell portion and the second shell portion are sealingly connected to form the flow channel.

[0024] In one embodiment, a channel opening is provided on a side of the second shell away from the supplementary air inlet, and the first shell is provided with an assembly groove for installing a sealing ring. The edge of the channel opening is inserted into the assembly groove and pressed against the sealing ring.

[0025] In the technical solution of the present invention, an anti-siphon assembly is provided within the valve body, with the inlet and outlet located on opposite sides of the anti-siphon assembly. This allows the anti-siphon assembly to selectively control the opening and closing of the inlet and the supplementary air inlet, as well as the corresponding opening degrees, under different operating conditions, thereby ensuring the normal operation of the vacuum breaker device and preventing siphon backflow in the system.

[0026] Specifically, the anti-siphon assembly includes a first sealing core, a second sealing core, and an elastic member. The first sealing core and the second sealing core are elastically connected via the elastic member. Thus, based on different operating pressures and flow conditions, the anti-siphon assembly controls the travel range of the first or second sealing core by precisely controlling the adaptive compression and extension range of the elastic member under the action of flow pressure, thereby achieving overtravel control of the first and second sealing cores and satisfying adaptive control of the openings of the inlet and supplementary air inlet, thereby ensuring that the vacuum breaker device can operate smoothly and reliably under different operating conditions. In other words, the inlet opening size is automatically adjusted within a certain adaptive range within the same device to meet output and stability requirements under different flow conditions, helping to improve flow control accuracy and output stability, and extending the service life of the vacuum breaker device. Furthermore, the elastic member can provide buffering support to prevent performance degradation or structural damage caused by excessive or insufficient travel. The fact that the first and second sealing cores share the same elastic member helps to simplify the structure and control of the vacuum breaker device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of an embodiment of a vacuum breaker device provided by the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the explosion of the vacuum breaker device;

[0030] Figure 3 for Figure 1 A top view of the vacuum breaker device;

[0031] Figure 4 for Figure 3 A cross-sectional view of the vacuum breaker device taken along section line AA, where the vacuum breaker device is in its initial state;

[0032] Figure 5 for Figure 3 A cross-sectional view of the vacuum breaker device taken along section line AA, where the vacuum breaker device is in a positive pressure state;

[0033] Figure 6 for Figure 3 A cross-sectional view of the vacuum breaker device taken along section line AA, where the vacuum breaker device is in the siphon state;

[0034] Figure 7 Schematic diagram of explosion of anti-siphon assembly;

[0035] Figure 8 for Figure 7 A schematic structural diagram of the first sealing core;

[0036] Figure 9 for Figure 7 Schematic diagram of the structure of the second sealing core.

[0037] Description of Figure Numbers:

[0038] 10. Valve body; 101. Flow channel; 102. Inlet; 103. Outlet; 104. Supplementary air inlet; 11. First shell; 111. Assembly groove; 12. Second shell; 121. Channel opening; 13. Sealing ring; 14. Guide and limit structure; 141. Guide and limit hole; 142. Limiting ring; 143. Connecting arm; 15. Bolt;

[0039] 20. Anti-siphon assembly; 21. First sealing core; 211. First core shaft; 2111. Moving cavity; 2112. Side-opening balancing hole; 212. First limiting portion; 2121. First sealing ring groove; 2122. First limiting wall; 2123. First stop wall; 213. First guide portion; 2131. Limiting step; 22. Second sealing core; 221. Second core shaft; 222. Second limiting portion; 2221. Second sealing ring groove; 2222. Second limiting wall; 2223. Second stop wall; 223. Second guide portion; 2231. Rib; 2232. Through-hole gap; 2233. Inner cavity; 23. Elastic member; 24. First sealing gasket; 25. Second sealing gasket.

[0040] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The vacuum breaker device is an important device widely used in water supply and drainage systems, pipeline projects and various fluid conveying systems. Its main function is to prevent the formation of a vacuum state in the system, avoid adverse phenomena such as siphoning, cavitation, pipeline damage and backflow of contaminated media caused by vacuum, which may cause public health accidents and affect the normal operation and safety of the system.

[0045] In the prior art, vacuum breaker devices are usually independent of the valve settings in the system and mostly adopt a fixed opening pressure design. In addition, due to slight leakage during the instantaneous closing of the air replenishment port during the use of the vacuum breaker device, it is necessary to add a guide tube, etc. This is not only not conducive to simplifying the overall structure of the system, but also makes the existing vacuum breaker device unable to meet the complex and changing working conditions, limiting its versatility and applicability in different application scenarios.

[0046] To address this technical problem, the present invention proposes a vacuum breaker device with adaptive variable stroke and backflow prevention. This vacuum breaker device can be used in situations where it is necessary to prevent siphon backflow and protect piping systems from damage due to negative pressure, specifically in water supply and drainage systems.

[0047] See also Figures 1 to 9 In one embodiment of the present invention, the vacuum breaker device includes a valve body 10 and an anti-siphon assembly 20. The valve body 10 is provided with a flow channel 101 and an inlet 102, an outlet 103, and a supplementary air inlet 104 connected to the flow channel 101. The inlet 102 and the supplementary air inlet 104 are arranged opposite to each other. The anti-siphon assembly 20 can be adaptively moved in the flow channel 101. The anti-siphon assembly 20 includes a first sealing core 21, a second sealing core 22, and an elastic member 23. The first sealing core 21 is connected to the second sealing core 22 via the elastic member 23, so that the vacuum breaker device has an initial state, a positive pressure state, and a siphon state. In the initial state, the When the elastic member 23 is in an extended state, the first sealing core 21 blocks the supplementary air inlet 104, and the second sealing core 22 blocks the inlet 102. In the positive pressure state, the elastic member 23 is in a compressed state under the action of the medium pressure, the first sealing core 21 blocks the supplementary air inlet 104, and the inlet 102 is connected to the outlet 103. In the siphon state, under the action of reverse negative pressure, the second sealing core 22 blocks the inlet 102, and the supplementary air inlet 104 is connected to the outlet 103. This configuration not only simplifies the structure of the vacuum breaker device, but also improves the adaptability of the vacuum breaker device under different working conditions.

[0048] In the technical solution of the present invention, an anti-siphon assembly 20 is disposed within the valve body 10, with the inlet 102 and outlet 103 located on opposite sides of the anti-siphon assembly 20. This allows the anti-siphon assembly 20 to selectively control the opening and closing of the inlet 102 and the supplemental air inlet 104, as well as the corresponding opening degrees, under different operating conditions, thereby ensuring the normal operation of the vacuum breaker device and preventing siphon backflow in the system.

[0049] Specifically, the anti-siphon component 20 includes a first sealing core 21, a second sealing core 22 and an elastic member 23. The first sealing core 21 and the second sealing core 22 are elastically connected through the elastic member 23. In this way, on the one hand, according to different working pressures and flow conditions, the anti-siphon component 20 controls the stroke range of the first sealing core 21 or the second sealing core 22 by precisely controlling the adaptive compression and extension range of the elastic member 23 under the action of flow pressure, thereby achieving overtravel control of the first sealing core 21 and the second sealing core 22, and meeting the adaptive control of the opening of the inlet 102 and the supplementary air inlet 104. The vacuum breaker device can be controlled to ensure smooth and reliable operation under different working conditions. In other words, the opening size of the inlet 102 can be automatically adjusted within a certain range of the same device to meet the output and stability requirements under different flow conditions, which helps to improve the flow control accuracy and output stability and extend the service life of the vacuum breaker device. On the other hand, the elastic member 23 can provide buffering support to avoid performance degradation or structural damage caused by excessive or insufficient stroke. The first sealing core 21 and the second sealing core 22 share the same elastic member 23, which helps to simplify the structure and control of the vacuum breaker device.

[0050] Specifically, the first sealing core 21 and the second sealing core 22 are connected by an elastic member 23, and the elastic member 23 has an adaptive variable compression stroke feature. Compared with the first sealing core 21 and the second sealing core 22, they are relatively independently controlled. That is, the first sealing core 21 and the second sealing core 22 have no direct connection relationship, such as Figure 4 As shown, when the vacuum breaker device is in the initial state, the elastic member 23 is in the extended state, so that the first sealing core 21 blocks the supplementary air inlet 104, and the second sealing core 22 blocks the inlet 102. When a medium enters the vacuum breaker device and switches from the initial state to the positive pressure state, as shown in FIG. Figure 5As shown, the second sealing core 22 is pressurized to move axially away from the inlet 102, thereby opening the inlet 102 and connecting it to the outlet 103. The first sealing core 21 reliably blocks the supplementary air inlet 104 under the dual action of the medium pressure and the elastic pressure. The medium enters the flow channel 101 through the inlet 102 and flows out of the vacuum breaker device through the outlet 103. At this time, the vacuum breaker device acts as a control valve to control the medium on and off and regulate the medium flow rate. In addition, since the first sealing core 21 always blocks the supplementary air inlet 104 in the initial state, the medium flows out through the outlet 103 after entering the flow channel 101, effectively reducing the possibility of leakage at the supplementary air inlet 104. No additional guide pipe is required, which helps to simplify the overall structure of the vacuum breaker device and improve the medium output reliability and flow rate of the vacuum breaker device. Figure 6 As shown, when the vacuum breaker device is in the siphon state, no medium enters the flow channel 101. The second sealing core 22 reliably blocks the inlet 102 under the action of reverse suction or ground gravity and elastic pressure. The first sealing core 21 opens the supplementary air inlet 104, and the external atmosphere enters the flow channel 101 through the supplementary air inlet 104, causing the pressure in the vacuum breaker device to increase, thereby breaking the vacuum state. At this time, the vacuum breaker device serves as a device for eliminating the system vacuum.

[0051] Optionally, in an embodiment of the present invention, the elastic member 23 is configured as a spring, and the elastic member 23 can achieve elastic connection between the first sealing core 21 and the second sealing core 22 by welding, riveting, etc. Of course, in other embodiments, the elastic member 23 can also be a silicone pad, a rubber pad, or other structure with an adaptive variable compression stroke feature.

[0052] Optionally, in an embodiment of the present invention, the diameter of the supplementary air inlet 104 is not less than the diameter of the outlet 103, that is, the diameter of the air inlet 104 may be greater than or equal to the diameter of the outlet 103. This helps the outside air to enter the vacuum breaker device mainly through the supplementary air inlet 104, thereby achieving vacuum elimination, thereby preventing backflow and reducing the impact on the normal operation and safety of the system.

[0053] See also Figure 2 and Figure 7In an embodiment of the present invention, the first sealing core 21 includes a first core shaft 211 and a first limiting portion 212 protruding from the outer circumference of the first core shaft 211, and the second sealing core 22 includes a second core shaft 221 and a second limiting portion 222 protruding from the outer circumference of the second core shaft 221. The elastic member 23 is arranged outside the first core shaft 211 and the second core shaft 221, and its two ends respectively abut against the first limiting portion 212 and the second limiting portion 222. In this way, the first limiting portion 212 and the second limiting portion 222 are used to clamp the two ends of the elastic member 23 to achieve axial limitation of the elastic member 23, and the elastic member 23 is arranged outside the first core shaft 211 and the second core shaft 221. Specifically, an elastic member 23, such as a spring or elastic pad, can be mounted on the first and second core shafts 211, 221. The first and second core shafts 211, 221 are used to radially limit the elastic member 23, ensuring that the elastic member 23 remains coaxial with the first and second sealing cores 21, 22 during operation. This improves the smoothness of the movement of the first and second sealing cores 21, 22, and thereby enhances the adaptability of the opening of the inlet 102, ensuring the normal operation of the vacuum breaker device under different operating pressures and flow rates, ensuring the stability of the flow output, and also controlling the supplementary air inlet 104, improving the efficiency of breaking the vacuum state, and effectively achieving medium non-return. However, the present design is not limited to this. In other embodiments, the elastic member 23 is connected between the opposing end surfaces of the first and second sealing cores 21, 22. Alternatively, the first sealing core 21 includes only the first limiting portion 212 and / or the second sealing core 22 includes only the second limiting portion 222. The structures of the first sealing core 21 and the second sealing core 22 may be the same or different. Specifically, the structures of the first core shaft 211 and the second core shaft 221 may be the same or different.

[0054] Furthermore, in an embodiment of the present invention, the first core shaft 211 is provided with a movable cavity 2111 opening toward the second sealing core 22, and the second core shaft 221 is movably inserted into the movable cavity 2111. Figures 4 to 6As shown, the elastic member 23 is sleeved outside the first core shaft 211, and the free end of the second core shaft 221 away from the second limiting portion 222 is inserted into the movable cavity 2111 of the first core shaft 211, so that the second core shaft 221 can make axial movement relative to the movable cavity 2111 under the action of an external force. Furthermore, through the setting of the movable cavity 2111, the movable cavity 2111 can play a guiding role, reduce the radial offset of the first sealing core 21 and the second sealing core 22, improve the smoothness of the relative movement between the two, and realize the adjustment and control of the opening of the inlet 102; at the same time, the structure is compact, which helps to reduce the overall occupied space of the anti-siphon assembly 20, thereby reducing the overall volume of the vacuum breaker device, and facilitating the assembly of the vacuum breaker device in a limited space. However, the present design is not limited thereto. In other embodiments, the elastic member 23 is sleeved outside the second core shaft 221 and is disposed together with the second core shaft 221 in the movable cavity 2111 , or the elastic member 23 is disposed between the upper end surface of the second core shaft 221 and the top wall of the movable cavity 2111 .

[0055] Please refer to Figure 8 In an embodiment of the present invention, the first sealing core 21 is provided with a side-opening balancing hole 2112 that passes through the first core shaft 211. In this way, the side-opening balancing hole 2112 passes through the cavity wall of the movable cavity 2111 along the radial direction of the first core shaft 211, which can effectively balance the air pressure in the movable cavity 2111 and the flow channel 101, reduce the additional resistance caused by the air pressure difference, and ensure the smooth movement of the second core shaft 221 in the movable cavity 2111, thereby improving the flow regulation accuracy and response speed of the second sealing core 22 to the inlet 102.

[0056] See also Figure 2 、 Figure 3 and Figure 8 In an embodiment of the present invention, a first sealing ring groove 2121 for installing a first sealing gasket 24 is provided on the first limiting portion 212. The first sealing gasket 24 is used to seal the supplementary air inlet 104. It can be understood that the first sealing ring groove 2121 is formed on the outer peripheral surface of the first limiting portion 212, so that the first sealing gasket 24 is installed in the first sealing ring groove 2121, and when the first limiting portion 212 is close to the supplementary air inlet 104, the first sealing gasket 24 is used to abut against the edge of the supplementary air inlet 104 to achieve the sealing of the supplementary air inlet 104.

[0057] Among them, the first sealing ring groove 2121 has a first limiting wall 2122 and a first stop wall 2123 spaced apart along the axial direction. The first limiting wall 2122 is arranged close to the second sealing core 22, and the surface facing the first stop wall 2123 is used to support the first sealing gasket 24, and the surface on the side away from the first stop wall 2123 is used to abut and limit with the elastic member 23, and the first stop wall 2123 is used to prevent the first sealing gasket 24 from escaping from the first sealing ring groove 2121, and its radial dimension is smaller than the radial dimension of the first limiting wall 2122, so as to form a first avoidance position on the first limiting portion 212 to expose part of the first sealing gasket 24, thereby ensuring the sealing abutment between the first sealing gasket 24 and the edge of the supplementary air inlet 104.

[0058] See also Figure 2 、 Figure 3 and Figure 9 In an embodiment of the present invention, a second sealing ring groove 2221 for installing a second sealing gasket 25 is provided on the second limiting portion 222, and the second sealing gasket 25 is used to seal the inlet 102. It can be understood that a second sealing ring groove 2221 is formed on the outer peripheral surface of the second limiting portion 222, so that the second sealing gasket 25 is installed in the second sealing ring groove 2221, and when the second limiting portion 222 is close to the inlet 102, the second sealing gasket 25 is used to abut against the edge of the inlet 102 to achieve the blocking of the inlet 102.

[0059] Among them, the second sealing ring groove 2221 has a second limiting wall 2222 and a second stop wall 2223 spaced apart along the axial direction. The second limiting wall 2222 is arranged close to the first sealing core 21, and the surface facing the second stop wall 2223 is used to limit the second sealing gasket 25, and the surface on the side away from the second stop wall 2223 is used to abut and limit with the elastic member 23, and the second stop wall 2223 is used to prevent the second sealing gasket 25 from escaping from the second sealing ring groove 2221, and its radial dimension is smaller than the radial dimension of the second limiting wall 2222, so as to form a second avoidance position on the second limiting portion 222 to expose part of the second sealing gasket 25, thereby ensuring the sealing abutment between the second sealing gasket 25 and the edge of the inlet 102.

[0060] See also Figures 1 to 6In an embodiment of the present invention, a first guide portion 213 is provided on the side of the first limiting portion 212 facing away from the second sealing core 22. A guide limiting structure 14 is provided within the supplemental air inlet 104. The guide limiting structure 14 includes a guide limiting hole 141 through which the first guide portion 213 passes. The guide limiting hole 141 guides the first guide portion 213. Combined with the limiting cooperation between the first core shaft 211 and the second sealing core 22, the movement of the two ends of the first sealing core 21 is properly constrained, effectively preventing the first sealing core 21 from tilting. This ensures smooth and stable axial reciprocating motion of the first sealing core 21, reduces wear, extends service life, and improves the sealing effect on the supplemental air inlet 104. However, the present design is not limited to this. In other embodiments, the first sealing core 21 may include only the first limiting portion 212 and the first core shaft 211.

[0061] Furthermore, in an embodiment of the present invention, a limiting step 2131 is provided on the first guide portion 213. The limiting step 2131 abuts against the edge of the guide limiting hole 141. This abutment between the limiting step 2131 and the edge of the guide limiting hole 141 effectively restricts further movement of the first sealing core 21, facilitating assembly and positioning of the first sealing core 21 within the flow channel 101, thereby improving assembly efficiency of the vacuum breaker device. The size of the first guide portion 213 can also be reduced, thereby reducing the space occupied by the first guide portion 213 within the supplemental air inlet 104. This also increases the effective contact area between the first guide portion 213 and the external atmosphere, ensuring that the supplemental air inlet 104 can be reliably opened to break the vacuum state during the siphoning state.

[0062] See also Figure 1 and Figure 3 In an embodiment of the present invention, the guide and limiting structure 14 includes a limiting ring 142 and a plurality of connecting arms 143 arranged at intervals along the circumference of the limiting ring 142, the connecting arms 143 are connected between the inner wall of the supplementary air inlet 104 and the limiting ring 142, and the inner ring hole of the limiting ring 142 is configured as the guide and limiting hole 141, wherein the limiting ring 142 is coaxially arranged with the supplementary air inlet 104, so that the first guide portion 213 can be accurately inserted into the inner ring hole of the limiting ring 142, thereby realizing the assembly of the first sealing core 21 in the valve body 10.

[0063] The connecting arm 143 includes a mounting arm and a cantilever arm. One end of the mounting arm is mounted to the stepped surface of the supplemental air inlet 104, while the other end extends axially, with the side facing away from the retaining ring 142 in contact with the hole wall of the supplemental air inlet 104, thereby improving the connection strength between the connecting arm 143 and the valve body 10. One end of the cantilever arm is perpendicularly connected to the mounting arm, while the other end extends toward the retaining ring 142 and is fixedly connected to the retaining ring 142. The cantilever arm is tapered in the direction of extension toward the retaining ring 142, thereby reducing the space occupied by the guide and retaining structure 14 on the supplemental air inlet 104. However, the present design is not limited to this. In other embodiments, the connecting arm 143 includes a cantilever arm.

[0064] See also Figures 1 to 6 In an embodiment of the present invention, a second guide portion 223 is provided on the side of the second limiting portion 222 facing away from the first sealing core 21. The second guide portion 223 is penetrated by the inlet 102 and is provided with a through hole connecting the inlet 102 and the outlet 103. In this way, the second guide portion 223 is guided by the inlet 102. Combined with the limiting cooperation between the first core shaft 211 and the second sealing core 22, the movement trend of the two ends of the second sealing core 22 is reasonably constrained, and the second sealing core 22 is effectively prevented from tilting, ensuring that the second sealing core 22 performs axial reciprocating motion steadily and smoothly, reducing wear, extending service life, and improving the sealing effect of the inlet 102.

[0065] The second guide portion 223 is provided with a through hole connecting the inlet 102 and the outlet 103, so as to cooperate with the overtravel control of the second sealing core 22. Figure 5 As shown, the opening of the through hole can also be controlled with the axial movement of the second sealing core 22, thereby achieving adaptive control of the opening of the inlet 102, thereby improving flow control accuracy and medium output stability. However, the present design is not limited to this. In other embodiments, the second sealing core 22 only includes the second core shaft 221 and the second limit portion 222.

[0066] See also Figure 9 In an embodiment of the present invention, the second guide portion 223 includes a plurality of ribs 2231 circumferentially spaced apart along the second limiting portion 222, and the through-holes are configured as through-hole gaps 2232 between two adjacent ribs 2231 and an inner cavity 2233 surrounded by the ribs 2231. In this way, guidance can be achieved through the cooperation between the ribs 2231 and the inlet 102. When the second sealing gasket 25 does not abut the edge of the inlet 102, the medium can flow through the inner cavity 2233 and the through-hole gaps 2232 in sequence through the inlet 102 to enter the flow channel 101, and / or enter the flow channel 101 through the assembly gap between the second guide portion 223 and the inlet 102, and then flow out of the vacuum breaker device through the outlet 103, thereby completing the normal output of the medium.

[0067] The second limiting portion 222 and the second core shaft 221 may form a receiving cavity communicating with the inner cavity 2233, thereby expanding the medium-accommodating capacity of the second sealing core 22. This allows the second sealing core 22 to accommodate a certain amount of medium, thereby increasing the medium pressure to be greater than the sum of the gravity and the elastic pressure, thereby opening the inlet 102. This also reduces the overall weight of the second sealing core 22.

[0068] By providing the through-hole gap 2232, it is also possible to ensure that the second sealing core 22 controls the opening of the inlet 102 while facilitating adjustment of the axial dimension of the second guide portion 223 to accommodate the structure of the pipe in which the inlet 102 is located. Specifically, it is only necessary to ensure that the upper edge of the water-passing gap is located close to the second limiting portion 222, and that the through-hole gap 2232 connects the inlet 102 and the outlet 103 when the second limiting portion 222 is not in sealing contact with the edge of the inlet 102. However, the present design is not limited to this. In other embodiments, the second guide portion 223 is a solid cylinder. In this case, the medium enters the flow channel 101 through the assembly gap between the second guide portion 223 and the inlet 102, and then flows out of the vacuum breaker device through the outlet 103, completing the normal output of the medium.

[0069] See also Figures 1 to 2 In an embodiment of the present invention, the valve body 10 includes a first shell portion 11 and a second shell portion 12. The first shell portion 11 is provided with the inlet 102, and the second shell portion 12 is provided with the outlet 103 and the supplementary air inlet 104. The first shell portion 11 and the second shell portion 12 are sealedly connected to form the flow channel 101. In this way, the separate arrangement of the first shell portion 11 and the second shell portion 12 facilitates the installation of the anti-siphon assembly 20 into the valve body 10, improves the assembly efficiency of the vacuum breaker device, and also facilitates the processing and manufacturing of the valve body 10.

[0070] Furthermore, in an embodiment of the present invention, a channel opening 121 is provided on a side of the second shell portion 12 away from the supplementary air inlet 104, and the first shell portion 11 is provided with an assembly groove 111 for installing the sealing ring 13. The edge of the channel opening 121 is inserted into the assembly groove 111 and is pressed into contact with the sealing ring 13, thereby hiding the connection position of the first shell portion 11 and the second shell portion 12 through the assembly groove 111. As well as the setting of the sealing ring 13, the path of the medium flowing to the connection position of the first shell portion 11 and the second shell portion 12 can be extended, thereby improving the sealing performance of the valve body 10, while improving the compactness of the valve body 10 and reducing the space occupied by the valve body 10.

[0071] In order to further improve the connection strength and connection sealing of the first shell 11 and the second shell 12, the first shell 11 and the second shell 12 are further locked and fixed by bolts 15. For example, a first connecting hole is provided on the first shell 11, and a second connecting hole is provided on the second shell 12 to dock with the first connecting hole. The first connecting hole is configured as a threaded hole, and the bolt 15 passes through the second connecting hole and is locked to the first connecting hole through threaded cooperation.

[0072] In addition, the first shell 11 and / or the second shell 12 may be provided with connecting pins, which can further fix the vacuum breaker device on the system to ensure the connection between the inlet 102 and the outlet 103 and the corresponding pipelines.

[0073] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A vacuum breaker device with adaptive variable stroke and anti-backflow, characterized in that: include: The valve body is provided with a flow channel and an inlet, an outlet and a supplementary air inlet communicating with the flow channel, wherein the inlet and the supplementary air inlet are arranged opposite to each other; an anti-siphon assembly, adaptively movable within the flow channel, comprising a first sealing core, a second sealing core, and an elastic member, wherein the first sealing core is connected to the second sealing core via the elastic member, so that the vacuum breaker device has an initial state, a positive pressure state, and a siphon state through an adaptive variable compression stroke characteristic of the elastic member; In the initial state, the elastic member is in an extended state, the first sealing core blocks the supplementary air inlet, and the second sealing core blocks the inlet; In the positive pressure state, the elastic member is in a compressed state under the action of the medium pressure, the first sealing core blocks the supplementary air inlet, the inlet is opened, and connected to the outlet; In the siphon state, under the action of reverse negative pressure, the second sealing core blocks the inlet, and the supplementary air inlet communicates with the outlet.

2. The vacuum breaker device according to claim 1, wherein: The first sealing core includes a first core shaft and a first limiting portion protruding from the outer circumferential surface of the first core shaft, the second sealing core includes a second core shaft and a second limiting portion protruding from the outer circumferential surface of the second core shaft, and the elastic member is arranged outside the first core shaft and the second core shaft, and its two ends respectively abut the first limiting portion and the second limiting portion.

3. The vacuum breaker device according to claim 2, wherein: The first core shaft is provided with a movable cavity opening toward the second sealing core, and the second core shaft is movably inserted into the movable cavity; And / or, the first sealing core is provided with a side-opening balancing hole penetrating the first core shaft; And / or, the elastic member is configured as a spring.

4. The vacuum breaker device according to claim 2, wherein: The diameter of the supplementary air inlet is not less than the diameter of the outlet; And / or, a first sealing ring groove for mounting a first sealing gasket is provided on the first limiting portion, and the first sealing gasket is used to seal the supplementary air inlet; And / or, a second sealing ring groove for installing a second sealing gasket is provided on the second limiting portion, and the second sealing gasket is used to seal the inlet.

5. The vacuum breaker device according to claim 2, wherein: A first guide portion is provided on a side of the first limiting portion facing away from the second sealing core. A guide limiting structure is provided in the supplementary air inlet. The guide limiting structure is provided with a guide limiting hole for the first guide portion to pass through.

6. The vacuum breaker device according to claim 5, wherein: The first guide portion is provided with a limiting step, and the limiting step abuts against the edge of the guide limiting hole; And / or, the guide limiting structure includes a limiting ring and a plurality of connecting arms arranged at intervals along the circumference of the limiting ring, the connecting arms are connected between the inner wall of the supplementary air inlet and the limiting ring, and the inner ring hole of the limiting ring is configured as the guide limiting hole.

7. The vacuum breaker device according to claim 2, wherein: A second guide portion is provided on a side of the second limiting portion facing away from the first sealing core. The second guide portion penetrates the inlet. A through hole connecting the inlet and the outlet is formed in the second guide portion.

8. The vacuum breaker device according to claim 7, wherein: The second guide portion includes a plurality of ribs arranged at intervals along the circumference of the second limiting portion, and the through hole is configured as a through hole gap between two adjacent ribs and an inner cavity surrounded by each rib.

9. The vacuum breaker device according to any one of claims 1 to 8, wherein: The valve body includes a first shell portion and a second shell portion. The first shell portion is provided with the inlet, and the second shell portion is provided with the outlet and the supplementary air inlet. The first shell portion and the second shell portion are sealed and connected to form the flow channel.

10. The vacuum breaker device according to claim 9, wherein: A passage opening is provided on a side of the second shell away from the supplementary air inlet, and the first shell is provided with an assembly groove for installing a sealing ring. The edge of the passage opening is inserted into the assembly groove and pressed against the sealing ring.

Images