A float valve

Abstract

The utility model provides a kind of float ball valve, with independent valve cavity and piston cavity being separately arranged in valve body, to slide-fit piston body, piston rod linkage sealing element with communication hole controls valve seat through-hole, then combine the lever connected with piston rod movable connection of float ball, can realize that piston assembly opens when float ball is at the lowest position and float ball valve opening degree is maximum, when liquid level rises, float ball synchronous rising makes valve opening degree gradually smaller, when liquid level reaches specific value, sealing element closes the valve seat through-hole, after using this structure, it can effectively avoid frequent opening and closing valve, finally can accurately control the liquid level of water tank.

Description

Technical Field

[0001] This utility model relates to the field of fluid control equipment technology, and more specifically to a float valve. Background Technology

[0002] In the field of fluid control, float valves, as control components that automatically open and close based on changes in the liquid level within a water tank, are widely used in various scenarios such as building water supply and drainage, industrial circulating water systems, and agricultural irrigation to maintain a stable liquid level in the tank and ensure the normal operation of subsequent systems. For large-diameter float valves with a nominal pipe diameter of DN32 or more, whose structural design and performance are crucial to the reliability of the entire liquid level control system due to the need to meet larger inflow rates, this is particularly important.

[0003] Currently, most mainstream float valves with a diameter of DN32 or larger on the market use the following... Figure 1 The structure shown describes a float valve comprising a float, a lever mechanism, and a piston assembly. Its working principle is as follows: the float is linked to a key control point A in the piston assembly via a lever, thereby controlling the opening and closing state of point A. When the water level in the tank rises to a preset value, the float rises under buoyancy, driving point A to close via the lever. Because the force-bearing area S2 on one side of the piston assembly is greater than the pressure-bearing area S1 on the other side, the piston assembly moves as a whole under the pressure difference, ultimately achieving complete closure of the float valve and blocking water inflow. When the water level in the tank drops below the preset value, the float sinks with the water level, pulling point A open via the lever. At this time, the S2 space in the piston assembly, originally connected to point A, is open to the atmosphere, and the pressure quickly drops to zero. The water pressure at the inlet pushes the piston to move, opening the float valve. Water flows into the tank along the inlet channel until the water level rises back to the preset closing value, completing one water level control cycle. However, after long-term practical application and market feedback, the above-mentioned existing float valve structure has the following defects: Low level control accuracy. This type of float valve remains fully open throughout the entire water intake process, only triggering the closing action when the liquid level reaches the set closing level. However, during this process, the float is subject to violent shaking due to water flow impact and liquid level fluctuations, causing point A, which is linked to the float, to fail to close stably in one go, resulting in frequent opening and closing. Only when the liquid level in the tank continues to rise, exceeding the preset closing level by a certain height, can point A completely close under sufficient buoyancy. This leads to a deviation between the actual closing level and the preset closing level, making precise control of the tank level impossible. This can easily cause the tank to overflow or subsequent water-using equipment to malfunction due to insufficient liquid level.

[0004] The water inlet method does not meet actual needs. In most applications, the ideal water inlet method should allow for rapid water intake when the liquid level is low to quickly replenish the water volume, and a smaller water intake when the liquid level is close to the preset closing value to avoid overflow or impact caused by a sudden rise in liquid level. However, existing float valves can only achieve two states: fully open or fully closed. They cannot adjust the opening degree according to changes in liquid level. As a result, although the water intake speed can meet the water replenishment needs when the liquid level is low, it still enters at the maximum flow rate when the liquid level is close to the preset closing value. This not only easily causes rapid fluctuations in liquid level, but also aggravates the float shaking due to water flow impact, further affecting the stability of liquid level control, which is seriously inconsistent with the ideal water inlet requirements in actual applications.

[0005] The seals are prone to damage. When the existing float valve approaches the closed water level, point A experiences frequent opening and closing due to the float's movement. This subjects the seals at point A to repeated compression and friction, making them highly susceptible to wear, deformation, or decreased sealing performance. Damage to the seals will lead to leakage at point A, affecting the normal control function of the float valve. Frequent shutdowns for seal replacement are also necessary, significantly increasing maintenance costs and workload, shortening the float valve's lifespan, and causing long-term inconvenience for users. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a float valve that, when the float is at its lowest position, opens the piston assembly and the float valve opening is at its maximum; as the liquid level gradually rises, the float rises synchronously, causing the float valve opening to gradually decrease; and when the liquid level reaches a specific value, the float valve closes. By utilizing the characteristics of small liquid level fluctuations and small downward force of the float during this process, the frequent opening and closing of the float valve is avoided, thereby achieving precise control of the water tank liquid level.

[0007] The technical solution of this utility model is to provide a float valve, including a valve body, a piston assembly, and a float assembly. The piston assembly includes a piston body and a piston rod; the float assembly includes a float and a lever, with the float connected to one end of the lever; the valve body has independent valve chambers and piston chambers, separated by a connecting wall; the piston body slides within the piston chamber, and the valve chamber has a valve seat communicating with the inlet of the valve body; one end of the piston rod is connected to the piston body, and the other end of the piston rod extends through the connecting wall into the valve chamber; the other end of the piston rod is connected to a sealing element, and the reciprocating sliding of the piston rod can cause the sealing element to open or close the valve seat through hole; The piston body forms a first cavity between the side away from the valve cavity and the piston cavity, and the sealing member forms a second cavity between the side away from the piston cavity and the inlet; the piston rod has a connecting hole in the middle, and the connecting hole communicates with the first cavity and the second cavity. The lever is mounted on the valve body and its end extends into the piston chamber and is movably connected to the piston rod. The movement of the lever can drive the piston rod to slide back and forth.

[0008] Compared with the prior art, the float valve of this utility model has the following advantages: by separating the valve body into an independent valve chamber and a piston chamber, the valve seat through hole is controlled by a sliding piston body and a piston rod with a connecting hole, and the lever connected to the float is movably connected to the piston rod. This allows the piston assembly to open and the float valve to open to its maximum degree when the float is at its lowest position. When the liquid level rises, the float rises synchronously, causing the valve opening to gradually decrease. When the liquid level reaches a specific value, the sealing element closes the valve seat through hole. With this structure, frequent opening and closing of the valve can be effectively avoided, and the liquid level in the water tank can be accurately controlled.

[0009] As an improvement, the valve body includes a valve body and a valve cover. One end of the valve body has the inlet, and the other end has an opening, which is covered by the valve cover. The piston chamber is located within the valve cover, and the side wall of the valve cover near the valve chamber serves as a connecting wall. An outlet is located on the side wall of the valve body. With this structure, the independent arrangement of the valve chamber and piston chamber makes processing and assembly easier, and disassembly and assembly are convenient. This layout of the inlet, outlet, and various chambers is more rational, allowing fluid to flow along the expected path and providing a stable foundation for the coordinated action of the piston assembly, lever, and float.

[0010] As an improvement, the valve cover has an opening at the end furthest from the valve body, and an end cap is sealed to the opening, forming the first cavity between the end cap and the piston body. The lever is hinged to the side wall of the valve cover, and the side wall of the valve cover has a mounting hole. The end of the lever passes through the mounting hole and extends into the piston cavity. This structure facilitates the machining and forming of the first cavity and the inspection and maintenance of the piston assembly; the lever mounting structure is simple and easy to assemble.

[0011] As an improvement, a connecting plate is provided on the side wall of the valve cover, and the middle part of the lever is hinged to the connecting plate; a matching space is provided on the side wall of the piston body, and the end of the lever fits into the matching space. This structure improves the stability of the lever installation and the flexibility of its rotation, ensuring more precise lever transmission when the float rises and falls.

[0012] As an improvement, the lever includes a connecting sleeve, and the end of the float rod of the float is inserted into the connecting sleeve. Two actuating arms are connected to the end of the connecting sleeve away from the float rod. The two actuating arms are arranged parallel to each other, and a connecting plate is embedded between the two actuating arms. The end of each actuating arm near the connecting sleeve is hinged to the connecting plate. Matching grooves are provided on both sides of the piston rod, and the ends of the two actuating arms are correspondingly fitted into the matching grooves on both sides. With this structure, the connecting sleeve and the float rod are inserted and fitted together, facilitating the installation and removal of the float rod and ensuring stable transmission of the float's lifting force to the lever. The parallel arrangement of the two actuating arms and the embedding of the connecting plate between them, combined with the hinged design of the actuating arms on the connecting plate, makes the lever rotation smoother and avoids offset caused by unilateral force. The matching grooves on both sides of the piston rod at the ends of the two actuating arms ensure a more balanced driving force of the lever on the piston rod, reducing piston slippage and jamming.

[0013] As an improvement, a hollow filter element is provided at the end of the piston rod's connecting hole near the second cavity. One end of the filter element is connected to the wall of the connecting hole, and the other end of the filter element is provided with a filter screen. Fluid flows into the filter element after passing through the filter screen. With this structure, the filter element can effectively filter impurities in the fluid flowing into the connecting hole, preventing impurities from clogging the connecting hole and causing an imbalance in pressure between the first and second cavities.

[0014] As an improvement, the other end of the piston rod is provided with an embedding groove, one side of the seal is embedded in the embedding groove, and the other end of the seal is used to abut against the valve seat. With this structure, the seal assembly structure is simple and the installation is more reliable.

[0015] As an improvement, a limiting piece is fixedly connected to the other end of the piston rod, and this limiting piece is positioned on the lower side of the seal. With this structure, the limiting piece can stably support the seal, preventing the seal from shifting downwards or dislodging from the groove due to water flow impact or piston rod sliding.

[0016] As an improvement, the limiting plate has a through hole in the middle, and the filter element has a locking protrusion on its side wall. One end of the filter element passes through the through hole and connects to the wall of the connecting hole. The locking protrusion presses the limiting plate against the end face of the other end of the piston rod. With this structure, using the filter element to fix the limiting plate effectively simplifies the assembly structure of multiple components and improves the reliability of the overall connection. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of a float valve in the prior art.

[0018] Figure 2This is a cross-sectional view of the float valve of this utility model.

[0019] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle.

[0020] Figure 4 This is an exploded structural diagram of the float valve of this utility model.

[0021] As shown in the figure: Valve body 1, valve body 101, valve cover 102, inlet 103, outlet 104, valve cavity 105, end cover 106, piston cavity 107, connecting wall 108, first cavity 109, valve seat 110, second cavity 111, connecting plate 112, shaft hole 113, hinge shaft 114, mounting hole 115, piston body 2, piston rod 3, embedded groove 301, connecting hole 302, matching groove 303, seal 4, filter 5, filter screen 501, locking protrusion ring 502, limiting plate 6, float 7, ball 701, float rod 702, lever 8, connecting sleeve 801, actuating arm 802, hinge hole 803. Detailed Implementation

[0022] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0023] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for illustrative purposes. The drawings are for illustrative purposes only and are not drawn to scale.

[0024] It should also be understood that the terms "comprising," "having," "including," and "containing," when used in this specification, indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. Furthermore, when expressions such as "...at least one" appear after a list of listed features, they modify the entire listed feature, not individual elements in the list.

[0025] like Figures 1 to 4 As shown, this utility model discloses a float valve, including a valve body 1, a piston assembly and a float assembly.

[0026] The valve body 1 includes a valve body 101 and a valve cover 102. One end of the valve body 101 has an inlet 103, and the other end has an opening, with the inlet 103 and the opening facing each other. An outlet 104 is provided on the side wall of the valve body 101, perpendicular to the inlet 103. The valve cover 102 covers the opening, and the valve cover 102 is sealed to the opening. The cavity between the inlet 103, the outlet 104, and the opening is a valve cavity 105.

[0027] The valve cover 102 has an opening at one end away from the valve body 101, and an end cap 106 is sealed to the opening. A piston chamber 107 is formed between the inner cavity of the valve body 101 and the end cap 106. The valve chamber 105 and the piston chamber 107 are independent of each other. The side wall of the valve cover 102 near the valve chamber 105 is a connecting wall 108. The piston assembly includes a piston body 2 and a piston rod 3. The piston body 2 is slidably fitted in the piston chamber 107. A first cavity 109 is formed between the end cap 106 and the piston body 2.

[0028] One end of the piston rod 3 is connected to the piston body 2. In this specific embodiment, one end of the piston rod 3 and the piston body 2 are fixedly connected by fasteners, and one end of the piston rod 3 is connected to the middle of the piston body 2. The other end of the piston rod 3 extends through the connecting wall 108 and into the valve chamber 105.

[0029] A valve seat 110 is provided on the inner wall of the valve cavity 105 near the inlet 103. The valve seat 110 has a through hole, which communicates with the inlet 103 and the valve cavity 105. A sealing element 4 is connected to the other end of the piston rod 3. Specifically, the other end of the piston rod 3 has an embedding groove 301. One side of the sealing element 4 is embedded in the embedding groove 301, and the other side of the sealing element 4 rests against the valve seat 110. The reciprocating movement of the piston rod 3 can cause the sealing element 4 to open or close the through hole of the valve seat 110.

[0030] The sealing element 4, located away from the piston chamber 107, forms a second cavity 111 with the inlet 103. The piston rod 3 has a connecting hole 302 in its middle section, which communicates with the first cavity 109 and the second cavity 111. A hollow filter element 5 is provided at the end of the connecting hole 302 of the piston rod 3 near the second cavity 111. One end of the filter element 5 is threaded to the wall of the connecting hole 302. The other end of the filter element 5 has a filter screen 501, through which fluid from the inlet 103 flows into the filter element 5.

[0031] The other end of the piston rod 3 is fixedly connected to a limiting piece 6, which limits the sealing element 4 to its lower side; that is, the limiting piece 6 has a through hole in its middle, and the filter element 5 has a locking protrusion 502 on its side wall. One end of the filter element 5 passes through the through hole and connects to the wall of the connecting hole 302, and the locking protrusion 502 presses the limiting piece 6 against the end face of the other end of the piston rod 3.

[0032] The float assembly includes a float 7 and a lever 8. The float 7 includes a sphere 701 and a float rod 702, with one end of the float rod 702 connected to the float 7. The lever 8 includes a connecting sleeve 801, with the other end of the float rod 702 inserted into the connecting sleeve 801. Two actuating arms 802 are connected to the end of the connecting sleeve 801 away from the float rod 702, and these two actuating arms 802 are arranged parallel to each other.

[0033] The valve cover 102 has a connecting plate 112 on its side wall. The connecting plate 112 is embedded between two actuating arms 802. One end of the actuating arm 802 near the connecting sleeve 801 is hinged to the connecting plate 112. That is, one end of each of the two actuating arms 802 is provided with a hinge hole 803. The connecting plate 112 is provided with a shaft hole 113. The two hinge holes 803 are located on both sides of the shaft hole 113, and the hinge holes 803 are aligned with the shaft hole 113. The hinge holes 803 and the shaft hole 113 are connected by a hinge shaft 114.

[0034] The valve cover 102 has mounting holes on its sidewalls, which communicate with the piston chamber 107. These mounting holes are located on the sidewall of the piston chamber 107 away from the first chamber 109 and are not interconnected with the first chamber 109. The ends of the two actuating arms 802 pass through the mounting holes in the valve cover 102 and extend into the piston chamber 107. The piston body 2 has matching spaces on its sidewalls; specifically, the piston rod 3 has matching grooves 303 on both sidewalls, and the ends of the two actuating arms 802 are correspondingly fitted into the matching grooves 303 on both sides.

[0035] The working process of the float valve in this application is as follows: When the water level in the tank is lower than the preset value, the float 7 is at its lowest position, causing one end of the lever 8 to sink. The other end of the lever 8 pushes the piston rod 3 to slide in the piston chamber 107, causing the sealing element 4 to move away from the through hole of the valve seat 110. At this time, the float valve is at its maximum opening, and the water at the inlet 103 flows into the water tank from the outlet 104 through the valve chamber 105. As the water level gradually rises, the float 7 rises synchronously due to buoyancy. The lever 8 rotates accordingly and pulls the piston rod 3 to slide in the opposite direction. The sealing element 4 gradually approaches the through hole of the valve seat 110, and the opening of the float valve gradually decreases, reducing the water inflow. When the water level reaches a specific value, the float 7 rises to the corresponding high position. The lever 8 drives the piston rod 3 to slide to the position where the sealing element 4 is completely pressed against the through hole of the valve seat 110, and the float valve closes, stopping the water inflow. If the water level subsequently drops, the float 7 sinks, and the above opening process will be repeated to achieve the cyclic control of the water level in the tank.

[0036] This float valve, through its rational structural design, achieves dynamic adaptation between liquid level and valve opening: when the float 7 is at its lowest position, the piston assembly is open and the valve opening is at its maximum, enabling rapid water replenishment; as the liquid level rises, the float 7 rises synchronously, gradually reducing the valve opening and preventing sudden increases in liquid level; when the liquid level reaches a specific value, the valve closes precisely. Throughout the process, liquid level fluctuations are minimal and the downward force on the float 7 is small, effectively avoiding the problems of easy damage to the seal 4 and short maintenance cycles caused by frequent opening and closing of traditional float valves. Ultimately, it achieves precise control of the water tank level, meeting the requirements of practical applications for liquid level control accuracy, reasonable water inlet, and equipment lifespan.

[0037] The above are merely specific embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Any modifications or equivalent substitutions to this utility model without departing from its spirit and scope should be covered within the protection scope of the claims of this utility model.

Claims

1. A float valve, comprising a valve body (1), a piston assembly, and a float assembly, wherein the piston assembly comprises a piston body (2) and a piston rod (3); the float assembly comprises a float (7) and a lever (8), wherein the float (7) is connected to one end of the lever (8); characterized in that: The valve body (1) is provided with independent valve chambers (105) and piston chambers (107), which are separated by a connecting wall (108); the piston body (2) is slidably fitted in the piston chamber (107), and the valve chamber (105) is provided with a valve seat (110) that communicates with the inlet (103) of the valve body (1); one end of the piston rod (3) is connected to the piston body (2), and the other end of the piston rod (3) extends through the connecting wall (108) into the valve chamber (105); the other end of the piston rod (3) is connected to a sealing element (4), and the piston rod (3) can drive the sealing element (4) to open or close the through hole of the valve seat (110) by sliding back and forth; The piston body (2) forms a first cavity (109) between the side away from the valve cavity (105) and the piston cavity (107), and the seal (4) forms a second cavity (111) between the side away from the piston cavity (107) and the inlet (103); the piston rod (3) is provided with a connecting hole (302) in the middle, and the connecting hole (302) is connected to the first cavity (109) and the second cavity (111); The lever (8) is mounted on the valve body (1) and the end of the lever (8) extends into the piston chamber (107) and is movably connected to the piston rod (3). The lever (8) can move to drive the piston rod (3) to slide back and forth.

2. The float valve according to claim 1, characterized in that: The valve body (1) includes a valve body (101) and a valve cover (102). One end of the valve body (101) is provided with the inlet (103), and the other end of the valve body (101) is provided with an opening. The valve cover (102) covers the opening. The piston chamber (107) is located inside the valve cover (102). The side wall of the valve cover (102) near the valve chamber (105) is a connecting wall (108). The side wall of the valve body (101) is provided with an outlet (104).

3. The float valve according to claim 2, characterized in that: The valve cover (102) has an opening at one end away from the valve body (101), and an end cap (106) is sealed to the opening. The end cap (106) and the piston body (2) form the first cavity (109). The lever (8) is hinged to the side wall of the valve cover (102), and the side wall of the valve cover (102) has a mounting hole. The end of the lever (8) passes through the mounting hole and extends into the piston cavity (107).

4. The float valve according to claim 3, characterized in that: The valve cover (102) has a connecting plate (112) on its side wall, and the lever (8) is hinged to the connecting plate (112) in the middle; the piston body (2) has a matching space on its side wall, and the end of the lever (8) is fitted into the matching space.

5. The float valve according to claim 4, characterized in that: The lever (8) includes a connecting sleeve (801), and the end of the float rod (702) of the float (7) is inserted into the connecting sleeve (801); the end of the connecting sleeve (801) away from the float rod (702) is connected to two actuating arms (802), the two actuating arms (802) are arranged parallel to each other, the connecting plate (112) is embedded between the two actuating arms (802), and the end of the actuating arm (802) near the connecting sleeve (801) is hinged to the connecting plate (112); the piston rod (3) is provided with matching grooves (303) on both sides, and the ends of the two actuating arms (802) are matched in the matching grooves (303) on both sides.

6. The float valve according to claim 1, characterized in that: The piston rod (3) has a hollow filter element (5) at the end of the connecting hole (302) near the second cavity (111). One end of the filter element (5) is connected to the hole wall at the end of the connecting hole (302), and the other end of the filter element (5) is provided with a filter screen (501). Fluid flows into the filter element (5) after passing through the filter screen (501).

7. The float valve according to claim 6, characterized in that: The piston rod (3) has an embedding groove (301) at the other end. One side of the seal (4) is embedded in the embedding groove (301), and the other side of the seal (4) is used to abut against the valve seat (110).

8. The float valve according to claim 7, characterized in that: The other end of the piston rod (3) is fixedly connected to a limiting piece (6), and the limiting piece (6) is limited to the lower side of the seal (4).

9. The float valve according to claim 8, characterized in that: The limiting piece (6) has a through hole in the middle, and the filter element (5) has a locking protrusion (502) on its side wall. One end of the filter element (5) passes through the through hole and connects to the wall of the connecting hole (302). The locking protrusion (502) presses the limiting piece (6) against the end face of the other end of the piston rod (3).

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