Ball float valve

Abstract

The invention relates to the technical field of valves, in particular to a floating ball valve. The floating ball valve comprises a valve body, a valve element assembly and a driving assembly, the valve body is provided with a first on-off opening, a first flow channel and a second flow channel, and the first on-off opening communicates with the first flow channel and the second flow channel; the valve element assembly is movably arranged in the valve body and selectively abuts against the first on-off opening so that the first flow channel and the second flow channel can be communicated or separated. The driving assembly comprises a lever structure, a floating ball and a sinking ball, one end of the lever structure is connected with the valve element assembly, the other end of the lever structure is connected with the floating ball, and the other end of the lever structure is connected with the sinking ball through a flexible part; wherein the weight of the floating ball is smaller than that of the sinking ball, and the density of the floating ball is smaller than that of water. The technical problem that a floating ball valve is frequently opened and closed is solved, and the purposes that the floating ball valve is controllable in opening and closing and the liquid level can be adjusted are achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of valves, in particular to a floating ball valve. BACKGROUND

[0002] The water level control of a water storage container usually adopts a single-lever floating ball valve or a remote control floating ball valve, and the water inlet of the pool and the downstream water use are simultaneously performed. When the water use peak period occurs, the amount of downstream peak water use and the amount of pool water replenishment are simultaneously performed. The water storage pool is always full, the water storage pool cannot be filled at off-peak times, and the water storage pool cannot play the role of peak regulation and storage. As a result, the water pressure and water volume of the water supply pipe network are insufficient during the peak period, and the municipal pipe network low pressure area is formed and expanded. Finally, a new water plant or an expanded water plant has to be built to meet the peak demand. In addition, once the downstream user uses water, the floating ball is immediately opened, the water inlet main valve is opened for water inlet, and the floating ball and the water inlet main valve are re-closed when the highest water level is reached. This water inlet control method of the pool is prone to frequent opening and closing of the water inlet valve, loud water inlet noise, short product life, easy formation of dead water area in the pool, secondary pollution of water quality, and strong intermittent pressure impact on the municipal pipe network. SUMMARY

[0003] The application provides a floating ball valve, which solves the technical problem of frequent opening and closing of the floating ball valve and achieves the purpose of controllable opening and closing and adjustable liquid level of the floating ball valve.

[0004] In order to achieve the above purpose, the main technical scheme adopted by the application includes: The application provides a floating ball valve, which includes a valve body, a valve core assembly and a driving assembly. The valve body has a first on-off port, a first flow passage and a second flow passage. The first on-off port communicates the first flow passage and the second flow passage. The valve core assembly is movably arranged in the valve body. The valve core assembly selectively abuts against the first on-off port to communicate or cut off the first flow passage and the second flow passage. The driving assembly includes a lever structure, a floating ball and a sinking ball. One end of the lever structure is connected with the valve core assembly, the other end of the lever structure is connected with the floating ball, and the other end of the lever structure is connected with the sinking ball through a flexible piece. The weight of the floating ball is less than the weight of the sinking ball, and the density of the floating ball is less than the density of water.

[0005] In the application, when the water amount in the water storage pool reaches a predetermined highest water level, the buoyancy acting on the floating ball pushes the lever structure, the lever structure pushes the valve core assembly to abut against the first on-off port, thereby cutting off the first flow passage and the second flow passage, and closing the floating ball valve to stop water inlet. When the liquid level in the water storage pool is lower than a predetermined lowest water level, the gravity of the sinking ball pulls the lever structure to push the valve core assembly away from the first on-off port, thereby communicating the first flow passage and the second flow passage, and opening the floating ball valve to start water inlet. The opening and closing of the floating ball valve are controllable, and the liquid level is controllable.

[0006] Optionally, the density of the sink ball is greater than the density of water.

[0007] Optionally, the valve body comprises a first valve body and a second valve body, the first flow channel, the first on-off port and the second flow channel are arranged in the first valve body, the second valve body is connected with the first valve body and part of the second valve body extends into the first valve body; the valve core assembly comprises a first valve core assembly and a second valve core assembly, the first valve core assembly is connected with the second valve body in sliding mode, the first valve core assembly and the second valve body define a first pressure cavity, the first valve core assembly is provided with a third flow channel which communicates the first flow channel and the first pressure cavity, one end of the second valve core assembly is arranged in the second valve body in sliding mode, the other end of the second valve core assembly is connected with the one end of the lever structure to selectively block the third flow channel under the driving of the lever structure.

[0008] Optionally, the first valve core assembly comprises a first support frame and a diaphragm, along the axial direction of the first valve body, the first support frame is arranged in the first valve body and connected with the second valve body in sliding mode, one end of the diaphragm is connected with the first support frame and the other end is connected with the second valve body, the first support frame and the second valve body define the first pressure cavity; along the axial direction of the first valve body, the first support frame has oppositely arranged first and second side surfaces, the first side surface selectively blocks the first on-off port and the second side surface is located in the first pressure cavity, the area of the first side surface is smaller than the area of the second side surface.

[0009] Optionally, the second valve body has a second pressure cavity and a second on-off port, the second pressure cavity communicates with the third flow channel and the second on-off port respectively, the second valve core assembly is arranged in the second valve body in sliding mode to block or open the second on-off port.

[0010] Optionally, the second valve core assembly comprises a piston, a second support frame and a second sealing member, the piston is arranged in the second valve body in sliding mode, the piston has a fourth flow channel which communicates the third flow channel and the second pressure cavity, one end of the second support frame is connected with the piston and the other end is connected with the lever structure through the second on-off port, the second sealing member is sleeved on the second support frame to selectively block the second on-off port.

[0011] Optionally, the first valve core assembly has a first flow passage, two ends of the first flow passage respectively communicate with the first flow channel and the third flow channel; the fluid flow area between the second support frame and the second on-off port is greater than the fluid flow area of the first flow passage.

[0012] Optionally, the force of the water in the second pressure cavity acting on the piston is greater than the force of the water in the second pressure cavity acting on the second sealing member.

[0013] Optionally, the lever structure comprises a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is hinged to the second valve body and the first connecting rod is connected to the valve core assembly, one end of the second connecting rod is hinged to the first valve body, the other end of the second connecting rod is connected to the floating ball and the sinking ball, one end of the third connecting rod is connected to the other end of the first connecting rod, and the other end of the third connecting rod is connected to the second connecting rod.

[0014] Optionally, the floating ball valve further comprises a valve cover and a float, the valve cover is arranged on the valve body, the valve cover is provided with a second air hole in communication with the outside, and the second air hole is selectively communicated with the first flow channel; the float is slidably arranged in the valve body to open the second air hole when the pressure in the first flow channel is less than the pressure outside. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 Structure schematic diagram of a floating ball valve in an embodiment of the present application; Figure 2 Structure schematic diagram of a floating ball valve in an embodiment of the present application; Figure 3 Structure schematic diagram of a floating ball valve in an embodiment of the present application, wherein the floating ball valve is in a closed state; Figure 4 Structure schematic diagram of a floating ball valve in an embodiment of the present application, wherein the floating ball valve is in an open state; Figure 5 Structure schematic diagram of a floating ball valve in an embodiment of the present application.

[0017]

Explanation of reference numerals

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationship.

[0020] In the present application, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0021] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] The term "and / or" in the present application only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0023] "Multiple" appearing in the present application means two or more (including two), and similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0024] The water level control of the water storage container usually adopts a single water level control mode such as a traditional single-lever floating ball valve or a remote control floating ball valve. The water inlet of the pool and the downstream water use occur at the same time. During the peak water use period, the amount of peak downstream water use, and the amount of pool water replenishment from the municipal pipe network at the same time, the water storage pool is always full. The water storage pool cannot staggered water inlet, and does not play the role of peak regulation and storage. This causes the water supply pipe network to be insufficient in water pressure and water volume during the peak period, and the formation and expansion of the municipal pipe network low pressure area. Finally, new or expanded water plants have to be built to meet the peak demand. In addition, once the downstream user uses water, the small floating ball opens immediately, the water inlet main valve opens to fill water until the highest water level, and then the small floating ball and the water inlet main valve are closed again. This water inlet control mode of the pool is prone to frequent opening and closing of the water inlet valve, loud water inlet noise, short product life, easy formation of dead water area in the pool, secondary pollution of water quality, and strong intermittent pressure impact on the municipal pipe network.

[0025] Furthermore, the current single-lever floating ball valve has structural defects, which cause the valve to be unbalanced under pressure, resulting in the need for a large valve closing force for complete sealing. The single-lever force arm amplification coefficient used is small, requiring a large diameter of the floating ball, which causes the lever fulcrum to be prone to breakage, and the floating ball to have a large volume, occupy a large installation space, be difficult to transport, and have a high cost. The current remote control floating ball valve is prone to freezing or even cracking in winter, resulting in complete failure of the function of the floating ball valve. The external multiple copper pipes are prone to damage during transportation and installation.

[0026] In order to realize the water storage tank water peak-shaving, and play the water storage tank storage function, the water storage tank needs to be controlled by double liquid level, low water level, water, high water level, stop water. The current available way has dry reed, ultrasonic liquid level meter or electric valve control mode, but the three kinds of schemes need to use electricity, the reliability is low near the humid water storage container.

[0027] Therefore, the application provides a floating ball valve, which can realize water inflow at low water level and stop water inflow at high water level, solve the problem of frequent opening and closing of the floating ball valve, and achieve the purpose of adjusting liquid level. The floating ball valve of the application replaces electric control with mechanical control, and improves the safety and reliability of the floating ball valve.

[0028] The embodiment of the application provides a floating ball valve, which is referred to Figures 1 to 5 The floating ball valve comprises a valve body 1, a valve core assembly 2 and a driving assembly 3. The valve body 1 has a first on-off port 11, a first flow channel 12 and a second flow channel 13. The first on-off port 11 communicates the first flow channel 12 and the second flow channel 13. The valve core assembly 2 is movably arranged in the valve body 1. The valve core assembly 2 selectively abuts against the first on-off port 11 to communicate or cut off the first flow channel 12 and the second flow channel 13. The driving assembly 3 comprises a lever structure 31, a floating ball 32 and a sinking ball 33. One end of the lever structure 31 is connected with the valve core assembly 2. The other end of the lever structure 31 is connected with the floating ball 32. The other end of the lever structure 31 is connected with the sinking ball 33 through a flexible member 34. The weight of the floating ball 32 is less than that of the sinking ball 33. The density of the floating ball 32 is less than that of water. The flexible member 34 has flexibility and can be deformed in the process of being stressed or moving, such as a chain, a rope or the like.

[0029] Specifically, the first flow channel 12 can be used as the water inlet of the floating ball valve, the second flow channel 13 can be used as the water outlet of the floating ball valve, the valve core assembly 2 moves in the valve body 1, when the valve core assembly 2 abuts against the first on-off port 11, the first flow channel 12 and the second flow channel 13 are cut off, the floating ball valve is closed, and the water inflow is stopped; when the valve core assembly 2 leaves the first on-off port 11, the first on-off port 11 communicates the first flow channel 12 and the second flow channel 13, the floating ball valve is opened, and the water inflow starts.

[0030] The lever structure 31 is connected with the floating ball 32, the lever structure 31 is connected with the sinking ball 33 through the flexible member 34, and the density of the floating ball 32 is less than that of water. When the floating ball 32 is subjected to the buoyancy, the buoyancy acting on the floating ball 32 is greater than the gravity of the floating ball 32, so that the floating ball 32 can float and can generate a force on the lever structure 31, thereby closing the floating ball valve.

[0031] When the water level in the reservoir reaches the position of the predetermined floating ball 32, the floating ball 32 is located at the predetermined full water level of the reservoir, the position of the sunken ball 33 is not limited, if the buoyancy of the sunken ball 33 is greater than the gravity of the sunken ball 33, the flexible piece 34 of the sunken ball 33 is not straightened, the force on the sunken ball 33 does not affect the lever structure 31, if the buoyancy of the sunken ball 33 is less than the gravity of the sunken ball 33, the flexible piece 34 of the sunken ball 33 is straightened, the force on the sunken ball 33 affects the lever structure 31, as long as the force of the sunken ball 33 and the floating ball 32 on the lever structure 31 is to push the lever structure 31 to close the check valve, the density of the sunken ball 33 is not limited in the present application, the density of the sunken ball 33 can be greater than water, less than water or equal to water, as long as it can ensure that the force of the sunken ball 33 and the floating ball 32 on the lever structure 31 is to push the lever structure 31 to close the check valve.

[0032] It should be noted that the density of the floating ball 32 in the present application is not the density of the material itself of the floating ball 32, but the comprehensive density of the floating ball 32, which can be equal to the density of the material itself of the floating ball 32, or less than the density of the material itself of the floating ball 32, for example, if the actual density of the material itself of the floating ball 32 is greater than the density of water, such as the floating ball 32 is made of stainless steel, the density of the material itself is greater than water, but the structure of the floating ball 32 is hollow, and the comprehensive density is the value obtained by dividing the mass by the volume. Similarly, the density of the sunken ball 33 in the present application also refers to the comprehensive density of the sunken ball 33.

[0033] The weight of the floating ball 32 is less than the weight of the sunken ball 33, which can be understood as the weight of the floating ball 32 is much less than the weight of the sunken ball 33, when the water level in the reservoir begins to drop and drops below the floating ball 32, the gravity of the floating ball 32 is small and insufficient to pull the lever structure 31 to close the floating ball valve, when the water level in the reservoir drops to the position where the sunken ball 33 straightens the flexible piece 34, the gravity of the sunken ball 33 acts on the lever structure 31 to pull the lever structure 31 to open the floating ball valve.

[0034] It should be understood that in the present application, the lowest position of the sunken ball 33 can be controlled by adjusting the length of the flexible piece 34, thereby controlling the lowest water level; the highest water level can be controlled by adjusting the position of the floating ball 32, thereby achieving the purpose of adjusting the liquid level in the reservoir.

[0035] In the present application, reference Figure 1 When the water level in the reservoir reaches the predetermined highest water level, the buoyancy of the floating ball 32 pushes the lever structure 31, the lever structure 31 pushes the valve core assembly 2 to abut the first on-off port 11, thereby cutting off the first flow passage 12 and the second flow passage 13, thereby closing the floating ball valve and stopping water inflow; reference Figure 2When the water level in the reservoir is lower than the predetermined minimum water level, the gravity of the sink ball 33 pulls the lever structure 31 to push the valve core assembly 2 away from the first through hole 11, thereby connecting the first flow channel 12 and the second flow channel 13, and opening the float ball valve to start water inflow, so as to achieve the controllable opening and closing of the float ball valve and the controllable water level.

[0036] In one specific embodiment, the weight of the float ball 32 is much smaller than the weight of the sink ball 33, and the sink ball 33 is completely submerged in water and receives a buoyancy greater than the gravity of the sink ball 33. When the reservoir is at the predetermined maximum water level, the sink ball 33 does not exert force on the lever structure 31. The material density of the sink ball 33 and the float ball 32 is greater than the density of water, and the sink ball 33 and the float ball 32 can be configured as a hollow structure to reduce the volume occupied by the sink ball 33 and the float ball 32.

[0037] Optionally, the density of the sink ball 33 is greater than the density of water. The density of the sink ball 33 is greater than the density of water, which can reduce the volume of the sink ball 33 under the same gravity requirement, thereby reducing the volume of the sink ball 33 occupying the reservoir. The density of the sink ball 33 in this embodiment refers to the comprehensive density of the sink ball 33.

[0038] Optionally, with reference to Figures 3 to 5 , the valve body 1 includes a first valve body 14 and a second valve body 15, the first flow channel 12, the first through hole 11 and the second flow channel 13 are arranged in the first valve body 14, the second valve body 15 is connected with the first valve body 14 and part of the second valve body 15 extends into the first valve body 14; the valve core assembly 2 includes a first valve core assembly 21 and a second valve core assembly 22, the first valve core assembly 21 is in sliding connection with the second valve body 15, the first valve core assembly 21 and the second valve body 15 define a first pressure chamber 4, the first valve core assembly 21 is provided with a third flow channel 210 connecting the first flow channel 12 and the first pressure chamber 4, one end of the second valve core assembly 22 is arranged in sliding manner in the second valve body 15, the other end of the second valve core assembly 22 is connected with one end of the lever structure 31 to selectively block the third flow channel 210 under the driving of the lever structure 31.

[0039] It should be noted that selectively blocking the third flow channel 210 under the driving of the lever structure 31 means that the fluid in the third flow channel 210 does not flow, and does not specifically refer to mechanically blocking the third flow channel 210.

[0040] Specifically, the first valve body 14 has a first cavity, the second valve body 15 has a second cavity, the second valve body 15 is connected with the first valve body 14, and a part of the second valve body 15 extends into the first cavity, the first valve core assembly 21 is arranged in the first cavity, and a part of the first valve core assembly 21 extends into the second cavity of the second valve body 15, the first valve core assembly 21 moves in the second cavity relative to the second valve body 15 to block or open the first through hole 11; the second valve core assembly 22 moves in the second cavity relative to the second valve body 15 under the driving of the lever structure 31 to block the third flow channel 210 or connect the third flow channel 210 with the outside.

[0041] When the first valve core assembly 21 blocks the first through hole 11, the first flow channel 12 and the second flow channel 13 are cut off. The first flow channel 12 and the third flow channel 210 are always in communication, so the first flow channel 12 and the third flow channel 210 are always in flow. When the third flow channel 210 is blocked, the fluid in the first flow channel 12 continues to flow into the first pressure cavity 4 through the third flow channel 210, so that the pressure in the first pressure cavity 4 increases, thereby pushing the first valve core assembly 21 to block the first through hole 11; when the fluid in the third flow channel 210 starts to flow out, the pressure in the first pressure cavity 4 decreases or even generates negative pressure, and the water pressure in the first flow channel 12 pushes the first valve core assembly 21 to open the first through hole 11.

[0042] That is, when the first valve core assembly 21 leaves the first through hole 11 and the first flow channel 12 is connected with the second flow channel 13, the float ball valve is opened and water injection starts, at the same time, the water in the first flow channel 12 enters the first pressure cavity 4 from the third flow channel 210; when the water in the water storage pool reaches a predetermined water level, the buoyancy of the float ball 32 pushes the lever structure 31, thereby driving the second valve core assembly 22 to block the third flow channel 210, but since the end of the third flow channel 210 connected with the first flow channel 12 is still in the water inlet state, the pressure in the first pressure cavity 4 increases, thereby pushing the first valve core assembly 21 to move towards the direction of pressing the first through hole 11, until the first valve core assembly 21 blocks the first through hole 11, stops water inlet, and realizes controllable opening and closing of the float ball valve.

[0043] Optionally, referring to Figure 4 and Figure 5The first valve core assembly 21 comprises a first support frame 211 and a diaphragm 212. The first support frame 211 is arranged on the first valve body 14 and is in sliding connection with the second valve body 15 along the axial direction of the first valve body 14. One end of the diaphragm 212 is connected to the first support frame 211, and the other end is connected to the second valve body 15. The first support frame 211 and the second valve body 15 define the first pressure cavity 4. The first support frame 211 has a first side surface 2111 and a second side surface 2112 arranged opposite to each other along the axial direction of the first valve body 14. The first side surface 2111 selectively blocks the first on-off port 11, and the second side surface 2112 is located in the first pressure cavity 4. The area of the first side surface 2111 is smaller than the area of the second side surface 2112.

[0044] Specifically, one end of the diaphragm 212 is connected to the first support frame 211, and the other end is connected to the second valve body 15 to seal the first pressure cavity 4 and reduce fluid leakage in the first pressure cavity 4. Exemplarily, the first pressure cavity 4 is defined by the first support frame 211, the second valve body 15, and the diaphragm 212.

[0045] The first support frame 211 has the first side surface 2111 and the second side surface 2112 along the axial direction of the first valve body 14. When the first valve core assembly 21 blocks the first on-off port 11, the first side surface 2111 is located in the first on-off port 11. The first side surface 2111 is used to block the first on-off port 11, and the pressure in the first flow channel 12 acts on the first side surface 2111.

[0046] It should be noted that the second side surface 2112 faces the first pressure cavity 4. The second side surface 2112 does not refer to a specific surface, but refers to the surface of the first support frame 211 that directly or indirectly receives the force of the fluid in the first pressure cavity 4.

[0047] That is, the first side surface 2111 refers to the surface of the first support frame 211 facing the first flow channel 12 and receiving the force of the fluid in the first flow channel 12. The second side surface 2112 refers to the surface of the first support frame 211 that directly or indirectly receives the force of the fluid in the first pressure cavity 4. The area of the first side surface 2111 is smaller than the area of the second side surface 2112. It can be understood that the area of the force-receiving surface of the first support frame 211 facing the first flow channel 12 is smaller than the area of the force-receiving surface of the first support frame 211 facing the first pressure cavity 4. When the float ball valve is closed, under the same pressure, the area of the force-receiving surface of the first support frame 211 facing the first pressure cavity 4 is greater than the area of the force-receiving surface of the first support frame 211 facing the first flow channel 12, so that the first valve core assembly 21 can be tightly blocked in the first on-off port 11, and fluid leakage is reduced.

[0048] The first valve core assembly 21 further comprises a first sealing member 213 arranged on the side of the first support member away from the first pressure cavity 4 in the axial direction of the first valve body 14, and abutting against the first through-and-break port 11 when the first valve core assembly 21 abuts against the first through-and-break port 11, so as to reduce the leakage of fluid from the first through-and-break port 11.

[0049] Optionally, referring to Figures 3 to 5 The second valve body 15 has a second pressure cavity 5 and a second through-and-break port 150, the second pressure cavity 5 is in communication with the third flow channel 210 and the second through-and-break port 150 respectively, and the second valve core assembly 22 is slidingly arranged in the second valve body 15 to block or open the second through-and-break port 150.

[0050] Specifically, the second valve core assembly 22 is slidingly arranged in the second valve body 15, and the second valve core assembly 22 and the second valve body 15 define the second pressure cavity 5 when the second valve core assembly 22 moves in the second valve body 15, the second pressure cavity 5 is in communication with the first through-and-break port 11, and the fluid in the first flow channel 12 can enter the second pressure cavity 5 through the third flow channel 210. When the lever structure 31 drives the second valve core assembly 22 to move to close the second through-and-break port 150, the end of the third flow channel 210 in communication with the first flow channel 12 is still in the water inlet state, the pressure in the second pressure cavity 5 and the first pressure cavity 4 increases, thereby pushing the first valve core assembly 21 to move towards the direction of pressing the first through-and-break port 11 until the first valve core assembly 21 blocks the first through-and-break port 11 to stop water inlet; when the lever structure 31 drives the second valve core assembly 22 to open the second through-and-break port 150, the fluid in the second pressure cavity 5 and the first pressure cavity 4 flows out, causing the pressure in the first pressure cavity 4 and the second pressure cavity 5 to decrease, and the fluid in the first flow channel 12 pushes the first valve core assembly 21 away from the first through-and-break port 11, thereby connecting the first flow channel 12 and the second flow channel 13 to start water filling, realizing the controllable opening and closing of the float ball valve.

[0051] Optionally, referring to Figure 4 and Figure 5 The second valve core assembly 22 comprises a piston 221, a second support frame 222 and a second sealing member 223, the piston 221 is slidingly arranged in the second valve body 15, the piston 221 has a fourth flow channel 2210 in communication with the third flow channel 210 and the second pressure cavity 5, one end of the second support frame 222 is connected with the piston 221, the other end of the second support frame 222 passes through the second through-and-break port 150 and is connected with the lever structure 31, and the second sealing member 223 is sleeved on the second support frame 222 to selectively block the second through-and-break port 150.

[0052] The piston 221 is slidingly arranged in the second valve body 15, and a second pressure cavity 5 is formed between the piston 221 and the second valve body 15. The fourth flow channel 2210 in the piston 221 is in communication with the third flow channel 210 and the second pressure cavity 5. When the lever structure 31 drives the second support frame 222 to selectively open or block the second on-off port 150, the piston 221 provides guidance for the movement of the second support frame 222, improves the stability of the movement of the second support frame 222, and reduces the deviation of the second support frame.

[0053] When the lever structure 31 drives the second valve core assembly 22 to move to close the second on-off port 150, the second sealing member 223 blocks the second on-off port 150, and the pressure in the second pressure cavity 5 and the first pressure cavity 4 increases, thereby pushing the first valve core assembly 21 to move towards the direction of pressing the first on-off port 11 until the first valve core assembly 21 blocks the first on-off port 11 and stops water inflow. When the lever structure 31 drives the second valve core assembly 22 to open the second on-off port 150, the second sealing member 223 leaves the second on-off port 150, and the fluid in the second pressure cavity 5 and the first pressure cavity 4 flows out, causing the pressure in the first pressure cavity 4 and the second pressure cavity 5 to decrease, and the fluid in the first flow channel 12 pushes the first valve core assembly 21 away from the first on-off port 11, thereby connecting the first flow channel 12 and the second flow channel 13 and starting water inflow, realizing controllable opening and closing of the float ball valve.

[0054] In an embodiment, the second valve body 15 is provided with a piston seat 6 fixed in the second valve body 15 along the radial direction of the second valve body 15. The piston 221 is sleeved between the piston seat 6 and the second valve body 15 and can slide relative to the piston seat 6 and the second valve body 15. A third sealing member is arranged between the piston 221 and the second valve body 15 along the radial direction of the second valve body 15 to reduce fluid leakage between the piston 221 and the second valve body 15. A fourth sealing member is arranged between the piston 221 and the piston seat 6 to reduce fluid leakage between the piston 221 and the piston seat 6.

[0055] The piston seat 6 is provided with a fifth flow channel 60 to connect the third flow channel 210 and the fourth flow channel 2210. The piston 221 is sleeved on the piston seat 6, and a plurality of through holes are arranged on the piston 221 to form the fourth flow channel 2210 to connect the third flow channel 210 and the second pressure cavity 5.

[0056] Exemplarily, the second valve body 15 is further provided with an exhaust hole 151 arranged on the side of the piston 221 away from the second pressure cavity 5 along the axial direction of the second valve body 15. Specifically, the second valve body 15, the piston seat 6, the first sealing member 213, the second sealing member 223, and the piston 221 form an air cavity. The piston 221 generates pressure in the air cavity during sliding. The arrangement of the exhaust hole 151 can reduce the resistance during the sliding of the piston 221.

[0057] Optionally, refer to Figure 4 and Figure 5 The first valve core assembly 21 has a first flow port 214, the two ends of which are connected to the first flow channel 12 and the third flow channel 210 respectively; the fluid flow area between the second support frame 222 and the second on / off port 150 is greater than the fluid flow area of ​​the first flow port 214.

[0058] Since the second support member passes through the second open / closed port 150 and occupies the area of ​​the second open / closed port 150, the fluid flow area of ​​the first flow port 214 is smaller than the fluid flow area between the second support frame 222 and the second open / closed port 150. When the second open / closed port 150 is opened from the closed state, the flow rate of the first flow port 214 entering the first pressure chamber 4 and the second pressure chamber 5 is less than the flow rate flowing out from between the second support frame 222 and the second open / closed port 150. This reduces the pressure in the first pressure chamber 4 and the second pressure chamber 5, thereby causing the fluid in the first flow channel 12 to press the first valve core assembly 21 away from the first open / closed port 11, thus opening the float valve and starting water injection.

[0059] Optionally, the force exerted by the water in the second pressure chamber 5 on the piston 221 is greater than the force exerted by the water in the second pressure chamber 5 on the second seal 223.

[0060] It should be noted that, since the water pressure in the second pressure chamber 5 is the same, the effective area of ​​the water pressure acting on the piston 221 is greater than the effective area of ​​the water pressure acting on the second seal 223, so that the force on the second valve core assembly 22 is to seal the second seal 223 at the second on / off port 150.

[0061] When the float valve is closed, the second open / close port 150 is in the closed state. The force exerted by the water in the second pressure chamber 5 on the piston 221 is greater than the force exerted on the second seal 223. Therefore, the second seal 223 can be stably sealed in the second open / close port 150, thereby reducing float valve leakage.

[0062] Optionally, the lever structure 31 includes a first link 311, a second link 312, and a third link 313. One end of the first link 311 is hinged to the second valve body 15 and connected to the valve core assembly 2. One end of the second link 312 is hinged to the first valve body 14, and the other end of the second link 312 is connected to the float 32 and the sinker ball 33. One end of the third link 313 is connected to the other end of the first link 311, and the other end of the third link 313 is connected to the second link 312.

[0063] The floating ball 32 or the sinking ball 33 applies a force to the second connecting rod 312, the second connecting rod 312 rotates relative to the first valve body 14, and drives the third connecting rod 313 to move, the third connecting rod 313 drives the first connecting rod 311 to rotate relative to the second valve body 15, and at the same time, the third connecting rod 313 drives the spool assembly 2 to block or open the second through hole 150.

[0064] The first connecting rod 311 is hinged at one end to the second valve body 15, the second connecting rod 312 passes through the second valve body 15 and is connected to the second support frame 222 in the second valve body 15, the other end of the first connecting rod 311 is connected to one end of the third connecting rod 313, the other end of the third connecting rod 313 is connected to the second connecting rod 312, and the connection position of the third connecting rod 313 and the second connecting rod 312 is located between the floating ball 32 and the first valve body 14. The arrangement of the first connecting rod 311, the second connecting rod 312 and the third connecting rod 313 in the application makes the force applied by the floating ball 32 or the sinking ball 33 to the second connecting rod 312 amplified twice, so that the floating ball 32 or the sinking ball 33 can open or close the floating ball valve with smaller force.

[0065] Optionally, referring to Figure 4 and Figure 5 , the floating ball valve further comprises a valve cover 7 and a float 81, the valve cover 7 covers the valve body 1, the valve cover 7 is provided with a second air hole 70 in communication with the outside, and the second air hole 70 is selectively communicated with the first flow passage 12; the float 81 is slidably arranged in the valve body 1 to open the second air hole 70 when the pressure in the first flow passage 12 is less than the pressure outside.

[0066] The valve body 1 has an opening matched with the valve cover 7, the valve cover 7 covers the opening, the float 81 is slidably arranged in the valve body 1, the float 81 has a sealing surface for sealing the second air hole 70, and the float 81 is matched with the second air hole 70 to seal, when the fluid in the floating ball valve flows out too fast to cause negative pressure in the floating ball valve, the float 81 moves away from the second air hole 70, so that the outside air enters the valve body 1, thereby destroying the negative pressure in the floating ball valve, and reducing the damage of the floating ball valve.

[0067] The float valve in the application comprises a first valve body 14 and a second valve body 15, the first valve body 14 comprises a valve body and a joint 16, the joint 16 is arranged in the valve body and connects the valve body and the second valve body 15, the joint 16 is connected with the valve body through a horizontal screw, the joint 16 is connected with the second valve body 15 through a vertical screw, and part of the second valve body 15 extends into the joint 16. The valve body is configured as an L-shaped structure and has a first flow channel 12, the valve body has a first valve seat 141, the first valve seat 141 is configured as a first on-off port 11, a first valve core assembly 21 composed of a first support frame 211, a diaphragm 212 and a first sealing element 213 is arranged in a cavity of the joint 16 and is slidable relative to the joint 16, the joint 16 has a first opening and a second opening, and a gap between the valve body and the joint 16 and the first opening and the second opening form a second flow channel 13, the second flow channel 13 is configured as an annular flow channel. When the first valve core assembly 21 abuts against the first on-off port 11, the first flow channel 12 is cut off from the second flow channel 13, and when the first valve core assembly 21 is away from the first on-off port 11, the first flow channel 12 is communicated with the second flow channel 13.

[0068] The diaphragm 212 is arranged in the joint 16 and has one end connected with the first support frame 211 and the other end connected between the joint 16 and the second valve body 15 to seal the connecting gap between the joint 16 and the second valve body 15. The diaphragm 212 is a telescopic bowl-shaped diaphragm and has a certain elastic deformation capacity. The outer peripheral wall of the diaphragm 212 abuts against the inner peripheral wall of the joint 16 to guide the movement of the first support part and improve the stability of the sliding of the first support part.

[0069] The second valve body 15 has an outer valve body and an inner valve body, the outer valve body is fixedly connected with the joint 16, the inner valve body is connected with the outer valve body through a connecting part 153, and part of the inner valve body extends into the joint 16.

[0070] The first support frame 211 comprises a first part located in the first valve body 14 and a second part located in the second valve body 15, the second part is in sliding connection with the second valve body 15, and along the radial direction of the first support frame 211, the outer diameter of the first part is greater than the outer diameter of the part of the second valve body 15 extending into the joint 16, so that when the second part slides in the second valve body 15 extending into the joint 16, the first part can limit the continuous sliding of the first support frame 211 when the first part abuts against the second valve body 15. A guide rail is arranged on the second part to enable the first support frame 211 to slide in the second valve body 15.

[0071] The first support member is provided with a third flow channel 210, and has a first flow passage 214 communicating the first flow channel 12 and the third flow channel 210, a second flow passage 215 communicating the third flow channel 210 and a fourth flow channel 2210, and a third flow passage 216 communicating the third flow channel 210 and the first pressure chamber 4. The fluid flow passage area of the first flow passage 214 is smaller than the effective fluid flow passage areas of the third flow channel 210, the second flow passage 215, the third flow passage 216, the fifth flow channel 60, the fourth flow channel 2210, the through hole of the piston 221, and the second on-off port 150.

[0072] The float ball valve further comprises an elastic member 9 sleeved on the inner valve body 1 along the axial direction of the first valve body 14, and abutting between the connecting portion 153 and the first support frame 211 to store energy for sliding of the first support frame 211.

[0073] The piston seat 6 is arranged in the inner valve body 1, and the piston 221 is arranged on the side of the piston seat 6 away from the first support frame 211. The second support frame 211 drives the piston 221 to slide in the inner valve body. The inner valve body has a second valve seat 152 forming the second on-off port 150. The piston 221 is arranged on the side of the second valve seat 152 facing the first support frame 211. The second sealing member 223 is arranged on the side of the second valve seat 152 away from the first support frame 211. The piston seat 6, the piston 221, the second valve seat 152, and the second sealing member 223 define a second pressure chamber 5. The gap between the second support frame 222 and the second valve seat 152 constitutes a fluid outlet of the second valve body 15. The first connecting port is arranged below the second support frame 222. The first connecting rod 311 is provided with a protrusion 3111 matched with the first connecting port, so as to realize the connection between the second support frame 222 and the first connecting rod 311.

[0074] The second support frame 222 comprises a main body portion, a first limiting portion, and a second limiting portion 2221. The main body portion is connected with the piston 221. The first limiting portion and the second limiting portion 2221 are arranged on the outer circumferential surface of the main body portion along the radial direction of the main body portion. The first limiting portion and the second limiting portion 2221 are arranged along the axial direction of the main body portion. The second sealing member 223 is sleeved on the main body portion along the axial direction of the main body portion, and abuts between the first limiting portion and the second limiting portion 2221. The first limiting portion and the second limiting portion 2221 limit the position of the second sealing member 223 along the axial direction of the main body portion. The second limiting portion 2221 is provided with a water discharge port 2222 to improve the water discharge speed.

[0075] Optionally, a filter 82 and a fixing frame 83 are arranged in the first flow channel 12. The fixing frame 83 is arranged at one end of the first valve body 14 close to the valve cover 7. One end of the filter 82 is in abutment with the fixing frame 83, and the other end is in abutment with the first valve seat 141, so as to reduce impurities in the water to block the float ball valve. The fixing frame 83 has a cavity between the fixing frame 83 and the valve cover 7. The float 81 is arranged in the cavity, and the float 81 selectively blocks the second air hole 70 on the valve cover 7.

[0076] When the pipeline pressure water with certain pressure flows into the first flow channel 12, the first valve core assembly 21 leaves the first on-off port 11 under the action of water pressure, and a large amount of pressure water enters the water storage container through the second flow channel 13. At the same time, the pressure water also enters the third flow channel 210 through the first flow port 214, part of the pressure water enters the first pressure cavity 4, and the other part of the pressure water enters the fifth flow channel 60 of the piston seat 6, and then enters the second pressure cavity 5 through the fifth flow channel 60 of the piston seat 6 and the fourth flow channel 2210 of the piston 221. When the water level in the water storage container reaches the position of the floating ball 32, the floating ball 32 floats upward under the action of buoyancy, drives the double-lever force arm amplification driving assembly 3 composed of the second connecting rod 312, the third connecting rod 313 and the first connecting rod 311 to move upward, drives the second support frame 222 to move upward, and stops until the second sealing element 223 tightly abuts against the second valve seat 152 to block the second on-off port 150. The pressure in the first pressure cavity 4 and the second pressure cavity 5 becomes larger and larger, pushes the diaphragm 212 and the first support frame 211 to move upward, and stops until the first valve core assembly 21 tightly abuts against the first valve seat 141 to block the first on-off port 11. The system stops water inflow. When the downstream water is used, the water level in the water storage container gradually decreases, and when the water level decreases to below the position of the floating ball 32, the pressure acting on the lower surface of the piston 221 is equal to the pressure acting on the surface of the second sealing element 223, but since the effective area of the piston 221 is much larger than the effective area of the second sealing element 223, the floating ball 32 does not have enough gravity to drive the double-lever force arm amplification driving assembly 3 to move downward, the second sealing element 223 still tightly abuts against the second valve seat 152, the second on-off port 150 is in a blocked state, and the first valve core assembly 21 is still in a state of blocking the first on-off port 11, so that the entire water supply system is still in a state of stopping water inflow. When the water level in the water storage container decreases to the position of the sinking ball 33, the sinking ball 33 gradually loses buoyancy, and gravity gradually dominates, so that the double-lever force arm amplification driving assembly 3 begins to move downward, forces the second sealing element 223 to gradually leave the second valve seat 152, and the pressure water in the first pressure cavity 4 and the second pressure cavity 5 is discharged outward through the second on-off port 150. Since the fluid flow area of the second on-off port 150 is larger than that of the first flow port 214, the pressure in the first pressure cavity 4 and the second pressure cavity 5 rapidly decreases, the first valve core assembly 21 leaves the first on-off port 11 under the action of water inflow pressure, and the water supply system begins to inflow water again until the water level rises to the position of the floating ball 32 and stops water inflow again. Such a cycle ensures that the water supply system can automatically control water inflow and water outflow. Moreover, the length of the flexible element 34 connected with the second connecting rod 312 and the sinking ball 33 can be adjusted to adjust the water level of the water storage container.The floating ball valve in the application not only solves the problem of short service life caused by frequent opening and closing of the traditional floating ball valve, but also solves the problem of the traditional floating ball valve that cannot adjust the water level. The floating ball valve in the application has novel structure design, clear principle, convenient use, no wearing parts, no electricity consumption, very high technical index, and is reliable and durable.

[0077] Next, a floating ball valve with a flow channel inner diameter of DN50 is taken as an example for description. (In order to facilitate calculation, the static friction and the movable friction of the sealing ring are ignored in the description process.) As shown in Figure 3 , the effective diameter of the lower surface of the piston 221 is Dp=16mm=1.6cm, the effective diameter of the upper surface of the second sealing member 223 is Ds=12mm=1.2cm, and if the water supply pressure of the water supply pipeline is , the force acting on the lower surface of the piston 221 is , the force acting on the upper surface of the second sealing member 223 is , the closing force of the pressure chamber generated by the difference pressure of the floating ball valve itself under the condition that the water storage container does not take in water is , and the buoyancy generated by the floating ball 32, so that the first pressure chamber 4 and the second pressure chamber 5 are in a completely closed state, forcing the pressure in the first pressure chamber 4 and the second pressure chamber 5 to become larger and larger, pushing the diaphragm 212 and the first support frame 211 to move upwards until the first valve core assembly 21 blocks the first through-and-break port 11.

[0078] As shown in Figure 3 , the effective diameter of the second side surface of the first support frame 211 is D=44mm, and the effective diameter of the first side surface is d=40mm, so , , the main closing force generated by the difference pressure of the floating ball valve itself is , Therefore, the floating ball valve is in a completely closed state and does not leak water, as shown in Figure 3 .

[0079] As shown in Figure 1As shown, when downstream water usage begins, the water level in the storage container gradually decreases. When the water level drops to position L5 where float 32 is located, the weight of float 32 is insufficient to overcome the closing force F=5.2752kg generated by the differential pressure of the float valve itself, so the float valve remains closed. When downstream water usage continues, the water level in the storage container continues to decrease until it reaches position L6 where sinker 33 is located. Sinker 33 gradually loses buoyancy, and gravity gradually takes over until it completely overcomes the pressure chamber closing force F=5.2752kg generated by the differential pressure of the float valve itself. The outlet of the second pressure chamber 5 opens, and the pressure in the first pressure chamber 4 and the second pressure chamber 5 decreases. Under the action of the inlet water pressure, the first valve core assembly 21 leaves the first on / off port 11, the float valve fully opens, and the system begins to receive water. The water level in the storage container gradually rises, and sinker 33 also rises with the water level until it is submerged in water and completely loses its weight. When the water level rises to position L5 where the float 32 is located, the buoyancy generated by the float 32 drives the double-lever amplification drive assembly 3 to move upward, forcing the outlet of the second pressure chamber 5 to close. The pressure in the first pressure chamber 4 and the second pressure chamber 5 gradually increases, pushing the telescopic bowl-shaped diaphragm 212 and the first support frame 211 upward until the first valve core assembly 21 comes into close contact with the first on / off port 11, and the float valve closes again. This cycle continues continuously, achieving the purpose of automatic water level control. By changing the length of the connecting flexible member 34, the water level in the storage container can also be adjusted.

[0080] like Figure 1 As shown, the lever arm amplification factor of the dual lever arm amplification drive assembly 3 Calculation of the diameter of float 32: Force on the working surface of the second seal 223 , The upward thrust of float 32 on the third link 313 is: , Therefore, the diameter ø1 of float 32 must be ≥ 120mm, so we take ø1 = 130mm. However, its weight must be very small, meaning the wall thickness of float 32 must be very thin, typically 0.5mm. If float 32 is made of 304 stainless steel sheet, the density of 304 stainless steel sheet is ρ = 7.85g / cm³. 3 The density of water is γ = g / cm³ 3 The gravity and buoyancy were verified as follows: Where R represents the outer diameter of the float and r represents the inner diameter of the float, indicating that the float 32 has sufficient upward thrust to ensure that the float valve is in a fully closed state.

[0081] The calculation of the diameter of the sink ball 33: the closing force F required by the second pressure chamber 5 = 5.2752 kg, then the weight of the sink ball 33 , it is concluded that the diameter of the sink ball 33 is ≥ 100 mm, and the diameter of the sink ball 33 is taken as 110 mm. Assuming that the material of the sink ball 33 is stainless steel 304, the density of stainless steel 304 is ρ = 7.85 g / cm 3 , the density of water is γ = g / cm 3 , and the buoyancy, weight and wall thickness of the sink ball 33 are reviewed as follows: , , where R represents the outer diameter of the sink ball, and r represents the inner diameter of the sink ball, it is concluded that the inner diameter of the sink ball 33 is r = 52.5 mm, then the wall thickness of the sink ball 33 is .

[0082] It should be noted that the terms "comprising", "containing", or any other similar term are intended to encompass non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not necessarily include only those elements, but can include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0083] Each embodiment in the specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other, and each embodiment focuses on the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0084] The above only describes the embodiments of the present application and does not limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

[0085] Although the embodiments of the present application are described in conjunction with the drawings, those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A float valve, characterized in that, include: The valve body (1) has a first open / close port (11), a first flow channel (12) and a second flow channel (13), wherein the first open / close port (11) connects the first flow channel (12) and the second flow channel (13); The valve core assembly (2) is movably disposed within the valve body (1). The valve core assembly (2) selectively abuts against the first on / off port (11) to connect or disconnect the first flow channel (12) and the second flow channel (13). The drive assembly (3) includes a lever structure (31), a float (32) and a sinker ball (33). One end of the lever structure (31) is connected to the valve core assembly (2), the other end of the lever structure (31) is connected to the float (32), and the other end of the lever structure (31) is connected to the sinker ball (33) via a flexible element (34). The weight of the float (32) is less than the weight of the sinker (33), and the density of the float (32) is less than the density of water.

2. The float valve according to claim 1, characterized in that, The density of the sinking ball (33) is greater than that of water.

3. The float valve according to claim 1, characterized in that, The valve body (1) includes a first valve body (14) and a second valve body (15). The first flow channel (12), the first on / off port (11) and the second flow channel (13) are disposed in the first valve body (14). The second valve body (15) is connected to the first valve body (14) and a portion of the second valve body (15) extends into the first valve body (14). The valve core assembly (2) includes a first valve core assembly (21) and a second valve core assembly (22). The first valve core assembly (21) is slidably connected to the second valve body (15). The first valve core assembly (21) and the second valve body (15) define a first pressure chamber (4). The first valve core assembly (21) is provided with a third flow channel (210) that connects the first flow channel (12) and the first pressure chamber (4). One end of the second valve core assembly (22) is slidably disposed in the second valve body (15). The other end of the second valve core assembly (22) is connected to one end of the lever structure (31) to selectively block the third flow channel (210) under the drive of the lever structure (31).

4. The float valve according to claim 3, characterized in that, The first valve core assembly (21) includes a first support frame (211) and a diaphragm (212). Along the axial direction of the first valve body (14), the first support frame (211) is disposed on the first valve body (14) and slidably connected to the second valve body (15). One end of the diaphragm (212) is connected to the first support frame (211) and the other end is connected to the second valve body (15). The first support frame (211) and the second valve body (15) define the first pressure chamber (4). Along the axial direction of the first valve body (14), the first support frame (211) has a first side (2111) and a second side (2112) disposed opposite to each other. The first side (2111) selectively blocks the first on / off port (11), and the second side (2112) is located in the first pressure chamber (4). The area of ​​the first side (2111) is smaller than the area of ​​the second side (2112).

5. The float valve according to claim 3, characterized in that, The second valve body (15) has a second pressure chamber (5) and a second open / close port (150). The second pressure chamber (5) is connected to the third flow channel (210) and the second open / close port (150) respectively. The second valve core assembly (22) is slidably disposed in the second valve body (15) to block or open the second open / close port (150).

6. The float valve according to claim 5, characterized in that, The second valve core assembly (22) includes a piston (221), a second support frame (222), and a second seal (223). The piston (221) is slidably disposed on the second valve body (15). The piston (221) has a fourth flow channel (2210) that connects the third flow channel (210) and the second pressure chamber (5). One end of the second support frame (222) is connected to the piston (221), and the other end passes through the second open / close port (150) and is connected to the lever structure (31). The second seal (223) is sleeved on the second support frame (222) to selectively block the second open / close port (150).

7. The float valve according to claim 6, characterized in that, The first valve core assembly (21) has a first flow port (214), and the two ends of the first flow port (214) are respectively connected to the first flow channel (12) and the third flow channel (210); The fluid flow area between the second support frame (222) and the second through-hole (150) is greater than the fluid flow area of ​​the first through-hole (214).

8. The float valve according to claim 6, characterized in that, The force exerted by the water in the second pressure chamber (5) on the piston (221) is greater than the force exerted by the water in the second pressure chamber (5) on the second seal (223).

9. The float valve according to claim 3, characterized in that, The lever structure (31) includes a first link (311), a second link (312) and a third link (313). One end of the first link (311) is hinged to the second valve body (15) and the first link (311) is connected to the valve core assembly (2). One end of the second link (312) is hinged to the first valve body (14) and the other end of the second link (312) is connected to the float (32) and the sinker (33). One end of the third link (313) is connected to the other end of the first link (311) and the other end of the third link (313) is connected to the second link (312).

10. The float valve according to claim 1, characterized in that, Also includes: A valve cover (7) is provided on the valve body (1). The valve cover (7) is provided with a second air hole (70) that communicates with the outside. The second air hole (70) is selectively connected to the first flow channel (12). The float (81) is slidably disposed in the valve body (1) to open the second air hole (70) when the pressure in the first flow channel (12) is less than the external pressure.

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