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

Abstract

The utility model discloses a vacuum breaker device with self-adaptive variable stroke and backflow prevention, which relates to the technical field of valve switches, and comprises a valve body and an anti-siphon component, a flow channel, an inlet, an outlet and a supplementary air inlet are arranged 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, 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] This utility model relates to the field of valve switching technology, and in particular to a vacuum breaker device with adaptive variable stroke and anti-backflow. Background Technology

[0002] Vacuum breaker devices are important devices widely used in water supply and drainage systems, pipeline engineering, and various fluid transportation systems. Their main function is to prevent the formation of a vacuum state within the system, avoiding adverse phenomena such as siphoning, cavitation, pipeline damage, and backflow of contaminated media caused by vacuum, which could lead to public health accidents and affect the normal operation and safety of the system.

[0003] In existing technologies, vacuum breaker devices are usually independent of the valve settings in the system, and most of them adopt a fixed opening pressure design. In addition, when vacuum breaker devices are used, there is a slight leakage during the closing process of the instantaneous air replenishment port, which requires the addition of a guide pipe. This not only makes it difficult to simplify the overall structure of the system, but also makes the existing vacuum breaker devices unable to meet the requirements of complex and ever-changing working conditions, thus limiting their versatility and applicability in different application scenarios. Utility Model Content

[0004] The main objective of this invention is to propose a vacuum breaker device with adaptive variable stroke and anti-backflow, which aims to simplify the structure of the vacuum breaker device and improve its adaptability under different working conditions.

[0005] To achieve the above objectives, the vacuum breaker device proposed in this utility model includes:

[0006] The valve body has a flow channel and an inlet, an outlet and a supplementary air inlet that connect the flow channel, with the inlet and the supplementary air inlet being arranged opposite to each other;

[0007] An anti-siphon assembly is adaptively movable within the flow channel. The anti-siphon assembly includes a first sealing core, a second sealing core, and an elastic element. The first sealing core is connected to the second sealing core through the elastic element, so that the vacuum breaker device can have an initial state, a positive pressure state, and a siphon state through the adaptive variable compression stroke characteristics of the elastic element.

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

[0009] Under the positive pressure state, the elastic element 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 it is 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 is connected to the outlet.

[0011] In one embodiment, the first sealing core includes a first mandrel and a first limiting portion protruding from the outer peripheral surface of the first mandrel, and the second sealing core includes a second mandrel and a second limiting portion protruding from the outer peripheral surface of the second mandrel. The elastic element is disposed outside the first mandrel and the second mandrel, and its two ends respectively abut against the first limiting portion and the second limiting portion.

[0012] In one embodiment, the first mandrel has a movable cavity with an opening facing the second sealing core, and the second mandrel is movably inserted into the movable cavity;

[0013] And / or, the first sealing core is provided with a side-opening balance hole that passes through the first mandrel;

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

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

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

[0017] And / or, the second limiting part is provided with a second sealing ring groove for mounting a second sealing gasket, the second sealing gasket being used to seal the inlet.

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

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

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

[0021] In one embodiment, the second limiting portion is provided with a second guide portion on the side opposite to the first sealing core, and the second guide portion passes through the inlet; the second guide portion has a through hole connecting the inlet and the outlet.

[0022] In one embodiment, the second guide portion includes a plurality of ribs arranged circumferentially along the second limiting portion, and the through hole is configured as the through hole gap between two adjacent ribs and the inner cavity enclosed by each rib.

[0023] In one embodiment, the valve body includes a first housing portion and a second housing portion, the first housing portion having the inlet, and the second housing portion having the outlet and the supplementary air inlet, the first housing portion and the second housing portion being sealed together to form the flow channel.

[0024] In one embodiment, the second housing portion has a channel opening on the side away from the supplemental air inlet, and the first housing portion has an assembly groove for installing a sealing ring. The edge of the channel opening is inserted into the assembly groove and presses against the sealing ring.

[0025] In the technical solution of this utility model, an anti-siphon component is installed in the valve body, and the inlet and outlet are located on opposite sides of the anti-siphon component. This allows the anti-siphon component to selectively control the opening and closing of the inlet and the corresponding opening degree of the supplementary air inlet under different operating conditions, ensuring the normal operation of the vacuum breaker device and preventing the siphon backflow phenomenon in the system.

[0026] Specifically, the anti-siphon assembly includes a first sealing core, a second sealing core, and an elastic element. The first and second sealing cores are elastically connected through the elastic element. Thus, on the one hand, according to different working pressures and flow conditions, the anti-siphon assembly controls the stroke range of the first or second sealing core by precisely controlling the adaptive compression and extension range of the elastic element under flow pressure. This achieves overtravel control of the first and second sealing cores, satisfying adaptive control of the inlet and supplementary air inlet openings. This ensures that the vacuum breaker device can operate smoothly and reliably under different working conditions, that is, it self-adjusts the inlet opening size within a certain adaptive range within the same device, satisfying output and stability under different flow conditions. This helps improve flow control accuracy and output stability, and extends the service life of the vacuum breaker device. On the other hand, the elastic element provides buffer support, preventing performance impact or structural damage due to excessive or insufficient stroke. Furthermore, the first and second sealing cores share the same elastic element, which helps simplify the structure and control of the vacuum breaker device. Attached Figure Description

[0027] 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.

[0028] Figure 1 A schematic diagram of a structure of an embodiment of the vacuum breaker device provided by this utility model;

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

[0030] Figure 3 for Figure 1 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, showing the vacuum breaker device in its initial state.

[0032] Figure 5 for Figure 3 A cross-sectional view of the vacuum breaker device taken along section line AA, at which point the vacuum breaker device is under positive pressure.

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

[0034] Figure 7 A schematic diagram to prevent the siphon assembly from exploding;

[0035] Figure 8 for Figure 7 Schematic diagram of the structure of the first sealing core;

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

[0037] Explanation of icon numbers:

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

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

[0040] 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

[0041] 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 scope of protection of the present utility model.

[0042] 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 specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0043] 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 use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. 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.

[0044] Vacuum breaker devices are important devices widely used in water supply and drainage systems, pipeline engineering, and various fluid transportation systems. Their main function is to prevent the formation of a vacuum state within the system, avoiding adverse phenomena such as siphoning, cavitation, pipeline damage, and backflow of contaminated media caused by vacuum, which could lead to public health accidents and affect the normal operation and safety of the system.

[0045] In existing technologies, vacuum breaker devices are usually independent of the valve settings in the system, and most of them adopt a fixed opening pressure design. In addition, when vacuum breaker devices are used, there is a slight leakage during the closing process of the instantaneous air replenishment port, which requires the addition of a guide pipe. This not only makes it difficult to simplify the overall structure of the system, but also makes the existing vacuum breaker devices unable to meet the requirements of complex and ever-changing working conditions, thus limiting their versatility and applicability in different application scenarios.

[0046] To address this technical problem, this invention proposes a vacuum breaker device with adaptive variable stroke and anti-backflow capabilities. This vacuum breaker device can be applied to situations requiring prevention of siphon backflow and protection of piping systems from negative pressure damage, specifically in water supply and drainage systems.

[0047] Please see Figures 1 to 9 In one embodiment of this utility model, the vacuum breaker device includes a valve body 10 and an anti-siphon assembly 20. The valve body 10 has a flow channel 101 and an inlet 102, an outlet 103, and a supplementary air inlet 104 communicating with the flow channel 101. The inlet 102 and the supplementary air inlet 104 are arranged opposite to each other. The anti-siphon assembly 20 is adaptively movable within the flow channel 101. The anti-siphon assembly 20 includes a first sealing core 21, a second sealing core 22, and an elastic element 23. The first sealing core 21 is connected to the second sealing core 22 through the elastic element 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 element 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 element 23 is in a compressed state under the action of 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 operating conditions.

[0048] In the technical solution of this utility model, an anti-siphon component 20 is provided inside the valve body 10, and the inlet 102 and the outlet 103 are located on opposite sides of the anti-siphon component 20. This allows the anti-siphon component 20 to selectively control the opening and closing of the inlet 102 and the supplementary air inlet 104 and the corresponding opening degree under different working conditions, ensuring the normal operation of the vacuum breaker device and preventing the siphon backflow phenomenon in the system.

[0049] Specifically, the anti-siphon assembly 20 includes a first sealing core 21, a second sealing core 22, and an elastic element 23. The first sealing core 21 and the second sealing core 22 are elastically connected through the elastic element 23. Thus, on the one hand, according to different working pressures and flow conditions, the anti-siphon assembly 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 element 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 degree of the inlet 102 and the supplementary air inlet 104. This design ensures that the vacuum breaker device can operate smoothly and reliably under different working conditions. In other words, the device can self-adjust the opening size of the inlet 102 within a certain range to meet the output and stability requirements under different flow conditions. This 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 element 23 can provide buffer support to avoid performance impact or structural damage due to excessive or insufficient stroke. Furthermore, the first sealing core 21 and the second sealing core 22 share the same elastic element 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 element 23. The elastic element 23 has an adaptive variable compression stroke characteristic and is controlled relatively independently of the first sealing core 21 and the second sealing core 22; that is, the first sealing core 21 and the second sealing core 22 do not have a direct connection. Figure 4 As shown, when the vacuum breaker device is in its initial state, the elastic element 23 is in its extended state, causing the first sealing core 21 to block the supplementary air inlet 104 and the second sealing core 22 to block the inlet 102. When a medium enters the vacuum breaker device and it switches from the initial state to the positive pressure state, as... Figure 5As shown, the second sealing core 22 is pressurized and moves axially away from the inlet 102, which opens the inlet 102 and connects it to the outlet 103. The first sealing core 21 reliably seals the supplementary air inlet 104 under the combined action of medium pressure and 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 on / off state of the medium and regulate its flow rate. Furthermore, since the first sealing core 21 always seals 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 pipes are needed, thus simplifying the overall structure of the vacuum breaker device and improving the reliability and flow rate of the medium output. Figure 6 As shown, when the vacuum breaker device is in a siphon state, no medium enters the flow channel 101. The second sealing core 22 reliably seals the inlet 102 under the action of reverse suction or gravity and elastic pressure. The first sealing core 21 opens the supplementary air inlet 104, and the outside atmosphere enters the flow channel 101 through the supplementary air inlet 104, which increases the pressure inside the vacuum breaker device, thereby breaking the vacuum state. At this time, the vacuum breaker device acts as a device to eliminate the system vacuum.

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

[0052] Optionally, in an embodiment of this utility model, 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 can be greater than or equal to the diameter of the outlet 103. This helps the outside atmosphere to mainly enter the vacuum breaker device through the supplementary air inlet 104, thereby eliminating the vacuum and preventing backflow, reducing the impact on the normal operation and safety of the system.

[0053] Please see Figure 2 and Figure 7In an embodiment of this utility model, the first sealing core 21 includes a first mandrel 211 and a first limiting portion 212 protruding from the outer peripheral surface of the first mandrel 211. The second sealing core 22 includes a second mandrel 221 and a second limiting portion 222 protruding from the outer peripheral surface of the second mandrel 221. The elastic member 23 is disposed outside the first mandrel 211 and the second mandrel 221, and its two ends respectively abut against the first limiting portion 212 and the second limiting portion 222. Thus, the first limiting portion 212 and the second limiting portion 222 clamp the two ends of the elastic member 23 to achieve axial limiting of the elastic member 23. The elastic member 23 is disposed outside the first mandrel 211 and the second mandrel 221. Specifically, the elastic element 23, configured as a spring, elastic pad, or other elastic component, can be fitted outside the first spindle 211 and the second spindle 221. The first spindle 211 and the second spindle 221 are used to radially limit the elastic element 23, ensuring that the elastic element 23 remains coaxial with the first sealing core 21 and the second sealing core 22 during operation. This improves the smoothness of the movement of the first and second sealing cores 21 and 22, thereby enhancing the adaptability of the inlet 102 opening. This satisfies the normal operation of the vacuum breaker device under different working pressures and flow conditions, ensuring the stability of the flow output. It also allows for control of the supplementary air inlet 104, improving the breaker efficiency under vacuum conditions and effectively achieving media backflow prevention. However, this design is not limited to this. In other embodiments, the elastic element 23 is connected between the opposite end faces of the first sealing core 21 and the second sealing core 22. Alternatively, the first sealing core 21 may only include the first limiting part 212 and / or the second sealing core 22 may only include the second limiting part 222. The structures of the first sealing core 21 and the second sealing core 22 can be the same or different. Specifically, the structures of the first mandrel 211 and the second mandrel 221 can be the same or different.

[0054] Furthermore, in an embodiment of this utility model, the first mandrel 211 is provided with a movable cavity 2111 opening towards the second sealing core 22, and the second mandrel 221 is movably inserted into the movable cavity 2111, such as... Figures 4 to 6As shown, the elastic element 23 is sleeved outside the first spindle 211, and the free end of the second spindle 221 away from the second limiting part 222 is inserted into the moving cavity 2111 of the first spindle 211. This allows the second spindle 221 to move axially relative to the moving cavity 2111 under external force. The moving cavity 2111 acts as a guide, reducing the radial offset between the first sealing core 21 and the second sealing core 22, improving the smoothness of their relative movement, and enabling 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 space occupied by 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, this design is not limited to this. In other embodiments, the elastic element 23 is sleeved outside the second spindle 221 and is disposed together with the second spindle 221 in the moving cavity 2111, or the elastic element 23 is disposed between the upper end face of the second spindle 221 and the top wall of the moving cavity 2111.

[0055] Please refer to the following: Figure 8 In an embodiment of this utility model, the first sealing core 21 is provided with a side-opening balance hole 2112 that penetrates the first mandrel 211. Thus, the side-opening balance hole 2112 penetrates the cavity wall of the moving cavity 2111 radially along the first mandrel 211, which can effectively balance the air pressure of the moving 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 mandrel 221 in the moving cavity 2111, thereby improving the flow regulation accuracy and response speed of the second sealing core 22 to the inlet 102.

[0056] Please see Figure 2 , Figure 3 and Figure 8 In an embodiment of this utility model, the first limiting part 212 is provided with a first sealing ring groove 2121 for the installation of the first sealing gasket 24. 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 part 212, so that the first sealing gasket 24 is installed into the first sealing ring groove 2121. When the first limiting part 212 is close to the supplementary air inlet 104, the first sealing gasket 24 abuts against the edge of the supplementary air inlet 104 to block the supplementary air inlet 104.

[0057] 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 disposed 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. The surface on the side away from the first stop wall 2123 is used to abut against the elastic member 23 for limiting. The first stop wall 2123 is used to prevent the first sealing gasket 24 from disengaging from the first sealing ring groove 2121, and its radial dimension is smaller than that of the first limiting wall 2122, so as to form a first clearance position on the first limiting part 212 to expose the first sealing gasket 24, thereby ensuring the sealing contact between the first sealing gasket 24 and the edge of the supplementary air inlet 104.

[0058] Please see Figure 2 , Figure 3 and Figure 9 In an embodiment of this utility model, the second limiting part 222 is provided with a second sealing ring groove 2221 for the installation of the second sealing gasket 25. The second sealing gasket 25 is used to seal the inlet 102. It can be understood that the outer peripheral surface of the second limiting part 222 is formed with the second sealing ring groove 2221, so that the second sealing gasket 25 is installed into the second sealing ring groove 2221. When the second limiting part 222 is close to the inlet 102, the inlet 102 is sealed by the second sealing gasket 25 abutting against the edge of the inlet 102.

[0059] The second sealing ring groove 2221 has a second limiting wall 2222 and a second stop wall 2223 spaced axially. The second limiting wall 2222 is located 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. The surface on the side away from the second stop wall 2223 is used to abut against the elastic member 23 for limiting. The second stop wall 2223 is used to prevent the second sealing gasket 25 from disengaging from the second sealing ring groove 2221, and its radial dimension is smaller than that of the second limiting wall 2222, so as to form a second clearance position on the second limiting part 222 to expose the second sealing gasket 25, thereby ensuring the sealing contact between the second sealing gasket 25 and the edge of the inlet 102.

[0060] Please see Figures 1 to 6In an embodiment of this utility model, a first guide portion 213 is provided on the side of the first limiting portion 212 opposite to the second sealing core 22, and a guide limiting structure 14 is provided in the supplementary air inlet 104. The guide limiting structure 14 is provided with a guide limiting hole 141 for the first guide portion 213 to pass through. In this way, the guide limiting hole 141 guides the first guide portion 213, and combined with the limiting fit between the first mandrel 211 and the second sealing core 22, the movement trend of both ends of the first sealing core 21 is reasonably constrained, effectively preventing the first sealing core 21 from tilting, ensuring that the first sealing core 21 performs axial reciprocating motion smoothly and steadily, reducing wear, extending service life, and improving the sealing effect on the supplementary air inlet 104. However, this design is not limited to this. In other embodiments, the first sealing core 21 only includes the first limiting portion 212 and the first mandrel 211.

[0061] Furthermore, in this embodiment of the present invention, the first guide portion 213 is provided with a limiting step 2131, which abuts against the edge of the guide limiting hole 141. Thus, the abutment between the limiting step 2131 and the edge of the guide limiting hole 141 effectively constrains further movement of the first sealing core 21, and facilitates the assembly and positioning of the first sealing core 21 within the flow channel 101, thereby improving the assembly efficiency of the vacuum breaker device. It also reduces the size of the first guide portion 213, thereby reducing its occupation of the space within the supplementary air inlet 104, while increasing the effective contact area between the first guide portion 213 and the outside atmosphere, ensuring reliable opening of the supplementary air inlet 104 under siphon conditions to break the vacuum state.

[0062] Please see Figure 1 and Figure 3 In an embodiment of this utility model, the guide limiting structure 14 includes a limiting ring 142 and a plurality of connecting arms 143 arranged circumferentially along 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. The inner ring hole of the limiting ring 142 is configured as the guide limiting hole 141. The limiting ring 142 is coaxially arranged with the supplementary air inlet 104, which allows the first guide part 213 to 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 supplementary air inlet 104, and the other end extends axially, with its side facing away from the limiting ring 142 fitting against the hole wall of the supplementary 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 vertically connected to the mounting arm, and the other end extends toward the limiting ring 142 and is fixedly connected to the limiting ring 142. The cantilever arm is tapered in the direction of extension toward the limiting ring 142, thereby reducing the space occupied by the guide limiting structure 14 on the supplementary air inlet 104. However, this design is not limited to this; in other embodiments, the connecting arm 143 includes a cantilever arm.

[0064] Please see Figures 1 to 6 In an embodiment of this utility model, the second limiting part 222 is provided with a second guide part 223 on the side opposite to the first sealing core 21. The second guide part 223 passes through the inlet 102 and has a through hole connecting the inlet 102 and the outlet 103. In this way, the inlet 102 guides the second guide part 223. Combined with the limiting fit between the first mandrel 211 and the second sealing core 22, the movement trend of both ends of the second sealing core 22 is reasonably constrained, effectively preventing the second sealing core 22 from tilting. This ensures that the second sealing core 22 can perform axial reciprocating motion smoothly and steadily, reducing wear, extending service life, and improving the sealing effect on the inlet 102.

[0065] The second guide section 223 is provided with a through hole connecting the inlet 102 and the outlet 103, which, in conjunction with the overtravel control of the second sealing core 22, such as... Figure 5 As shown, the opening degree of the through hole can also be controlled by the axial movement of the second sealing core 22, thereby achieving adaptive control of the opening degree of the inlet 102, thus improving the control accuracy of the flow rate and the stability of the medium output. However, this design is not limited to this. In other embodiments, the second sealing core 22 only includes the second mandrel 221 and the second limiting part 222.

[0066] Please see Figure 9 In an embodiment of this utility model, the second guide portion 223 includes a plurality of ribs 2231 arranged circumferentially along the second limiting portion 222. The through hole is configured as a through hole gap 2232 between two adjacent ribs 2231 and an inner cavity 2233 enclosed by each rib 2231. In this way, guidance can be achieved through the cooperation of the ribs 2231 with the inlet 102. When the second sealing gasket 25 does not abut against the edge of the inlet 102, the medium flows through the inlet 102, sequentially through the inner cavity 2233 and the through hole gap 2232, and enters the flow channel 101, and / or 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 to complete the normal output of the medium.

[0067] The second limiting part 222 and the second mandrel 221 can form a receiving cavity that communicates with the inner cavity 2233, thereby expanding the capacity of the second sealing core 22 to hold the medium. This allows the second sealing core 22 to hold a certain amount of medium, causing the medium pressure to be greater than the sum of the gravitational force and the elastic pressure, thus opening the inlet 102. It can also reduce the overall weight of the second sealing core 22.

[0068] By setting the through-hole gap 2232, it is possible to ensure the control of the opening of the inlet 102 by the second sealing core 22, while facilitating the adjustment of the axial dimension of the second guide portion 223 to adapt to the structure of the pipe where the inlet 102 is located. That is, it is only necessary to ensure that the upper edge of the through-hole gap is 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 does not seal against the edge of the inlet 102. However, this design is not limited to this. In other embodiments, the second guide portion 223 is a solid column. 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] Please see Figures 1 to 2 In an embodiment of this utility model, 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 sealed together to form the flow channel 101. Thus, by separating the first shell portion 11 and the second shell portion 12, it is convenient to install the anti-siphon assembly 20 into the valve body 10, improve the assembly efficiency of the vacuum breaker device, and facilitate the processing and manufacturing of the valve body 10.

[0070] Furthermore, in an embodiment of this utility model, the second housing portion 12 is provided with a channel opening 121 on the side away from the supplementary air inlet 104, and the first housing portion 11 is provided with an assembly groove 111 for mounting the sealing ring 13. The edge of the channel opening 121 is inserted into the assembly groove 111 and presses against the sealing ring 13. Thus, the connection position of the first housing portion 11 and the second housing portion 12 is hidden by the assembly groove 111, and the setting of the sealing ring 13 can extend the path of the medium flowing to the connection position of the first housing portion 11 and the second housing portion 12, improve the sealing performance of the valve body 10, and at the same time improve the compactness of the valve body 10 and reduce the space occupied by the valve body 10.

[0071] To further improve the connection strength and sealing performance 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, the first shell 11 is provided with a first connecting hole, and the second shell 12 is provided with a second connecting hole that mates 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 by thread engagement.

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

[0073] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A vacuum disrupter device with adaptive variable stroke, anti-backflow, characterized in that, include: The valve body has a flow channel and an inlet, an outlet and a supplementary air inlet that connect the flow channel, with the inlet and the supplementary air inlet being arranged opposite to each other; An anti-siphon assembly is adaptively movable within the flow channel. The anti-siphon assembly includes a first sealing core, a second sealing core, and an elastic element. The first sealing core is connected to the second sealing core through the elastic element, so that the vacuum breaker device can have an initial state, a positive pressure state, and a siphon state through the adaptive variable compression stroke characteristics of the elastic element. In the initial state, the elastic element is in an extended state, the first sealing core blocks the supplementary air inlet, and the second sealing core blocks the inlet; Under the positive pressure state, the elastic element 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 it is 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 is connected to the outlet.

2. The vacuum disrupter device of claim 1, wherein, The first sealing core includes a first mandrel and a first limiting portion protruding from the outer peripheral surface of the first mandrel. The second sealing core includes a second mandrel and a second limiting portion protruding from the outer peripheral surface of the second mandrel. The elastic element is disposed outside the first mandrel and the second mandrel, and its two ends respectively abut against the first limiting portion and the second limiting portion.

3. The vacuum disrupter device of claim 2, wherein, The first mandrel has a movable cavity with an opening facing the second sealing core, and the second mandrel is movably inserted into the movable cavity; And / or, the first sealing core is provided with a side-opening balance hole that passes through the first mandrel; And / or, the elastic element is configured as a spring.

4. The vacuum disrupter device of claim 2, wherein, The diameter of the supplemental air inlet is not less than the diameter of the outlet; And / or, the first limiting part is provided with a first sealing ring groove for mounting a first sealing gasket, the first sealing gasket being used to seal the supplementary air inlet; And / or, the second limiting part is provided with a second sealing ring groove for mounting a second sealing gasket, the second sealing gasket being used to seal the inlet.

5. The vacuum disrupter device of claim 2, wherein, The first limiting part is provided with a first guide part on the side opposite to the second sealing core, and the supplementary air inlet is provided with a guide limiting structure, and the guide limiting structure is provided with a guide limiting hole for the first guide part to pass through.

6. The vacuum disrupter device of 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 circumferentially along the limiting ring, the connecting arms being connected between the inner wall of the supplementary air inlet and the limiting ring, and the inner ring hole of the limiting ring being configured as the guide limiting hole.

7. The vacuum disrupter device of claim 2, wherein, The second limiting part is provided with a second guide part on the side opposite to the first sealing core, and the second guide part passes through the inlet; the second guide part has a through hole connecting the inlet and the outlet.

8. The vacuum disrupter device of 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 the through hole gap between two adjacent ribs and the inner cavity enclosed by each rib.

9. The vacuum disrupter device of any one of claims 1 to 8, wherein, The valve body includes a first housing and a second housing. The first housing has the inlet, and the second housing has the outlet and the supplementary air inlet. The first housing and the second housing are sealed together to form the flow channel.

10. The vacuum disrupter device of claim 9, wherein, The second housing has a channel opening on the side away from the supplementary air inlet, and the first housing has an assembly groove for installing a sealing ring. The edge of the channel opening is inserted into the assembly groove and presses against the sealing ring.

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