Pneumatic reversing valve

Abstract

The utility model relates to a kind of pneumatic reversing valve. Including the main valve cavity formed by the assembly of upper valve body and lower valve body, linkage column core is equipped in cavity;Main valve cavity is divided into upper section (outlet hole, upper valve port and upper transition cavity) and lower section (liquid inlet cavity, lower valve port, lower transition cavity, main liquid hole and liquid inlet hole), and is connected by communicating bypass between two sections;Linkage column core contains linkage upper valve stem, lower valve stem and pneumatic component.Drive when pneumatic component synchronously controls: ① liquid inlet state: upper valve is closed, lower valve is opened, liquid flows to main liquid hole from liquid inlet hole through liquid inlet cavity, lower transition cavity;②liquid outlet state: upper valve is opened, lower valve is closed, liquid flows to outlet hole from main liquid hole through lower transition cavity, communicating bypass and upper transition cavity.The utility model drives double valve by linkage column core rigidity synchronously, realizes zero delay staggered opening and closing, solves the problem of switching instantaneous flow break caused by one-way valve opening lag in double-piston alternate oil supply system, completely eliminates flow break window period, and guarantees liquid continuous stable supply.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic components and valve technology, specifically to a pneumatic directional valve. Background Technology

[0002] In the glass fiber production process, to effectively eliminate static electricity generated by fiber friction and prevent fibers from scattering, tangling, and attracting dust, an antistatic agent is usually sprayed onto the surface. To ensure a uniform and stable spraying effect, the antistatic agent must be continuously, stably, and precisely supplied to the spraying equipment.

[0003] To achieve continuous liquid supply, patent document CN222019801U (application date 2024.03.28) discloses a continuous oil supply component for an external spraying device for glass fiber antistatic agents, which is a scheme of alternating operation of two sets of piston-type liquid supply components. Specifically, each set of oil supply components consists of a cylinder, a piston, and a three-way pipe. The main pipe of the three-way pipe is connected to the cylinder, and its two branch pipes are the inlet pipe and the outlet pipe, respectively, and each is equipped with a one-way check valve. The two sets of oil supply components coordinate their actions through a drive mechanism, so that their working states (liquid suction or liquid delivery) are synchronously alternated. That is, when one set is in the liquid suction stroke, the other set is in the liquid delivery stroke, theoretically aiming to achieve a continuous and uninterrupted supply of antistatic agents.

[0004] However, in practical applications, a key technical bottleneck has been found in this type of continuous oil supply scheme based on the alternating operation of check valves and pistons: due to the inherent structural characteristics of check valves (such as the weight of the valve core, spring preload, or sealing friction), their opening requires overcoming a certain pressure difference, i.e., there is an "opening threshold pressure." This results in an unavoidable response lag when the check valve switches states, especially from the closed to the open state, making instantaneous opening impossible. At the moment when the two sets of oil supply components alternate between "suction" and "delivery" working states—for example, at the critical point when the delivery group completes its push and is about to enter the suction stroke, and the suction group completes its suction and is about to enter the delivery stroke—the pressure in the supply line undergoes a brief fluctuation and reconstruction process. At this time, due to the opening lag characteristic of the check valve, the check valve in the outlet line cannot respond and open immediately after the switch, resulting in an extremely brief but objectively existing "flow interruption window." This can lead to a momentary interruption or significant fluctuation in the supply of antistatic agents. Such momentary interruptions in oil supply or fluid supply are unacceptable for fiberglass production processes that require high precision and continuous spraying. It can lead to poor localized antistatic treatment of the fibers, thus affecting the quality of the final product, causing problems such as fuzz, broken ends, or electrostatic adsorption of impurities, and may even cause temporary disruptions to the production process.

[0005] Therefore, how to fundamentally eliminate the instantaneous oil cut-off phenomenon caused by the hysteresis effect of the one-way valve in the dual-piston alternating oil supply system, and achieve a truly pulsation-free and uninterrupted continuous and stable liquid supply, has become a key technical challenge for improving the performance of glass fiber antistatic agent external spraying equipment. Utility Model Content

[0006] To eliminate the instantaneous oil cut-off phenomenon in the above-mentioned dual-piston alternating oil supply system, this utility model provides a pneumatic reversing valve.

[0007] The technical solution adopted by this utility model is as follows: A pneumatic reversing valve includes an upper valve body and a lower valve body assembled as one piece, which together form a main valve cavity. A linkage core is slidably assembled in the main valve cavity. The main valve cavity is divided into upper and lower sections. The upper section is sequentially divided along the axial direction into a connected liquid outlet, an upper valve port, and an upper transition cavity. The lower section is sequentially divided along the axial direction into a liquid inlet cavity, a lower valve port, a lower transition cavity, and a main liquid outlet. The liquid inlet cavity is provided with a liquid inlet hole. A connecting bypass is provided between the upper transition cavity and the lower transition cavity. The linkage core includes a linked upper valve stem, a lower valve stem, and a pneumatic component. The upper valve stem cooperates with the upper valve port to form an upper valve. The system controls the flow between the liquid outlet and the upper transition chamber. The lower valve stem and the lower valve port cooperate to form a lower valve, which controls the flow between the lower transition chamber and the liquid inlet chamber. When the pneumatic component is driven by air pressure, it synchronously drives the upper valve and the lower valve to perform staggered opening and closing actions, forming two working states: ① Liquid inlet state: the upper valve is closed and the lower valve is open, and the liquid flows from the liquid inlet through the liquid inlet chamber and the lower transition chamber to the main liquid outlet; ② Liquid outlet state: the upper valve is open and the lower valve is closed, and the liquid flows from the main liquid outlet through the lower transition chamber, the connecting bypass, and the upper transition chamber to the liquid outlet.

[0008] Preferably, the upper valve stem and the lower valve stem have the same diameter and stroke length.

[0009] Preferably, the ends of the upper valve stem and the lower valve stem are provided with tapered heads.

[0010] Preferably, the main valve chamber is further provided with a middle section, which is divided into an upper air chamber, a piston chamber and a lower air chamber in sequence along the axial direction; the pneumatic component is a piston section, and the upper valve stem, the piston section and the lower valve stem form an integral linkage core; the piston section is sealed and assembled in the piston chamber, and the upper and lower end faces are exposed to the upper air chamber and the lower air chamber respectively. The upper air chamber and the lower air chamber are respectively provided with an upper air hole and a lower air hole for introducing driving gas to act on both ends of the piston section.

[0011] Preferably, the main valve chamber is provided with a first sealing ring for isolating the upper transition chamber from the upper air chamber and the upper gas chamber, and a second sealing ring for isolating the lower air chamber from the liquid inlet chamber, and a third sealing ring is provided on the outer peripheral wall of the piston section corresponding to the piston chamber.

[0012] Preferably, the upper valve port is provided with a fourth sealing ring corresponding to the upper valve stem, and the lower valve port is provided with a fifth sealing ring corresponding to the lower valve stem.

[0013] Preferably, at the mating surface between the upper valve body and the lower valve body, a sixth sealing ring is provided corresponding to the main valve cavity, and a seventh sealing ring is provided corresponding to the connecting bypass.

[0014] This utility model has the following beneficial effects:

[0015] 1. Achieve uninterrupted continuous liquid supply: The linkage column core drives the upper and lower valve stems to move rigidly and synchronously through pneumatic components, so that the upper and lower valves form a zero-delay staggered opening and closing when switching. In particular, when the upper valve closes, the lower valve opens instantaneously, supplying liquid from the main liquid hole to the inlet hole. This completely avoids the response lag caused by the opening pressure threshold of the check valve, eliminates the "flow interruption window" in the traditional solution, and ensures that the liquid flow is unfluid and uninterrupted when switching between inlet and outlet states.

[0016] 2. Liquid supply stability: In both the "liquid outlet state" and the "liquid inlet state", the liquid always maintains a continuous flow through the connecting bypass, avoiding sudden changes in flow caused by pipeline pressure reconstruction. It is especially suitable for high-precision processes such as glass fiber antistatic agent spraying, which can ensure stable liquid supply pressure and prevent defects such as fiber fuzz, broken ends and electrostatic adsorption of impurities caused by oil interruption.

[0017] 3. Simplified structure and high reliability: The integrated linkage core replaces the complex combination of multiple one-way valves and pistons, reducing sealing points and moving parts, lowering the failure rate. The equal diameter and equal stroke design of the valve stem and the conical sealing surface ensure the symmetry of the dual valve operation, further improving the switching synchronization. The multi-layer sealing ring isolates the gas chamber and liquid chamber, eliminating the risk of crossflow and extending the service life.

[0018] 4. Fast response speed, suitable for high-frequency switching scenarios: The pneumatic piston drive has millisecond-level response characteristics, which can meet the high-frequency reversing requirements and is suitable for high-speed continuous production lines. Attached Figure Description

[0019] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0020] Figure 2 This is a top view of an embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional view of an embodiment of this utility model.

[0022] Figure 4 This is a cross-sectional view of an embodiment of this utility model (with the linked core hidden).

[0023] Figure 5 This is a schematic diagram of the liquid flow direction in the liquid discharge state of an embodiment of this utility model.

[0024] Figure 6 This is a schematic diagram of the liquid flow direction in the liquid inlet state according to an embodiment of this utility model.

[0025] Upper valve body 1;

[0026] Lower valve body 2;

[0027] Main valve chamber 3, liquid outlet 3.1, upper valve port 3.2, upper transition chamber 3.3, liquid inlet chamber 3.4, lower valve port 3.5, lower transition chamber 3.6, main liquid port 3.7, liquid inlet port 3.8, connecting bypass 3.9, upper air chamber 3.10, piston chamber 3.11, lower air chamber 3.12, upper air port 3.13, lower air port 3.14;

[0028] Linkage column core 4, upper valve stem 4.1, lower valve stem 4.2, piston section 4.3;

[0029] First sealing ring 5;

[0030] Second sealing ring 6;

[0031] Third sealing ring 7;

[0032] Fourth sealing ring 8;

[0033] Fifth sealing ring 9;

[0034] Sixth sealing ring 10;

[0035] Seventh sealing ring 11. Detailed Implementation

[0036] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0037] In the embodiments, such as Figures 1-6As shown, a pneumatic directional valve includes an upper valve body 1 and a lower valve body 2 assembled as one piece, forming a main valve chamber 3. A linkage core 4 is slidably mounted in the main valve chamber 3. The main valve chamber 3 is divided into upper and lower sections. The upper section is sequentially divided along the axial direction into a liquid outlet 3.1, an upper valve port 3.2, and an upper transition chamber 3.3. The lower section is sequentially divided along the axial direction into a liquid inlet chamber 3.4, a lower valve port 3.5, a lower transition chamber 3.6, and a main liquid outlet 3.7. The liquid inlet chamber 3.4 is provided with a liquid inlet 3.8. The upper transition chamber 3.3 and the lower transition chamber... A bypass 3.9 is provided between chambers 3 and 6; the linkage core 4 includes a linkage upper valve stem 4.1, a lower valve stem 4.2, and a pneumatic component. The upper valve stem 4.1 cooperates with the upper valve port 3.2 to form an upper valve, controlling the opening and closing between the liquid outlet 3.1 and the upper transition chamber 3.3. The lower valve stem 4.2 cooperates with the lower valve port 3.5 to form a lower valve, controlling the opening and closing between the lower transition chamber 3.6 and the liquid inlet chamber 3.4. When the pneumatic component is driven by air pressure, it synchronously drives the upper and lower valves to perform staggered opening and closing actions, forming two working states: ① Liquid inlet state, such as... Figure 5 As shown: ① The upper valve is closed and the lower valve is open; liquid flows from the inlet hole 3.8 through the inlet chamber 3.4 and the lower transition chamber 3.6 to the main liquid hole 3.7; ② Outlet state, as shown... Figure 6 As shown: with the upper valve open and the lower valve closed, the liquid flows from the self-liquid hole 3.7 through the lower transition chamber 3.6, the connecting bypass 3.9, and the upper transition chamber 3.3 to the liquid outlet hole 3.1.

[0038] This embodiment achieves zero-time-difference switching between upper valve 4.1 and lower valve 4.2 by rigidly and synchronously driving the upper valve stem 4 and lower valve stem 4.2 through the linkage core 4, thus avoiding the lag in opening of the one-way valve. Furthermore, by connecting the bypass 3.9, a complete path is formed in the liquid outlet state: "main liquid hole 3.7 → lower transition chamber 3.6 → connecting bypass 3.9 → upper transition chamber 3.2 → liquid outlet 3.1," avoiding sudden flow changes caused by pipeline pressure rebuilding and ensuring a smooth flow transition during the switching process. When the reversing valve of this embodiment is applied to the continuous oil supply assembly of the glass fiber antistatic agent external spraying equipment disclosed in patent document CN222019801U, it can completely eliminate the "flow interruption window" when the dual-piston type liquid supply assemblies work alternately, meeting the stringent requirements for liquid supply stability in processes such as glass fiber antistatic agent spraying, and eliminating defects such as fuzz and broken ends.

[0039] In the embodiments, such as Figure 3 , Figure 4 As shown, the upper valve stem 4.1 and the lower valve stem 4.2 have the same diameter and stroke length. The identical diameter and stroke of the upper valve stem 4.1 and the lower valve stem 4.2 ensure balanced opening and closing forces and precise synchronization of movement between the two valves, avoiding sealing delays or localized wear caused by dimensional differences. This equal stroke design ensures strictly consistent contact / separation times of the sealing surfaces of the two valves, reducing hydraulic shock and extending the life of the sealing rings.

[0040] In the embodiments, such as Figure 3 , Figure 4 As shown, the upper valve stem 4.1 and the lower valve stem 4.2 are provided with tapered heads at their ends. The tapered head structure facilitates the insertion and sliding fit of the upper valve stem 4.1 and the lower valve stem 4.2 with the sealing ring, avoids scratching the sealing ring, and has a high tolerance for liquid impurities. It is not easy to get stuck and is suitable for antistatic agent media containing trace particles, thus reducing the failure rate.

[0041] In the embodiments, such as Figure 3 , Figure 4 As shown, the main valve chamber 3 also has a middle section, which is divided into an upper air chamber 3.10, a piston chamber 3.11, and a lower air chamber 3.12 along the axial direction. The pneumatic component is a piston section 4.3, and the upper valve stem 4.1, piston section 4.3, and lower valve stem 4.2 form an integrated linkage core 4. The piston section 4.3 is sealed and assembled in the piston chamber 3.11, with its upper and lower end faces exposed to the upper air chamber 3.10 and lower air chamber 3.12, respectively. The upper air chamber 3.10 and lower air chamber 3.12 are respectively provided with an upper air hole 3.13 and a lower air hole 3.14 for introducing driving gas to act on both ends of the piston section 4.3. The piston section 4.3 and the valve stem are integrally formed, eliminating the transmission gap of the traditional split type, ensuring that the pneumatic driving force is converted into the linear motion of the valve stem, shortening the switching time, and integrating power and enhancing synchronization. The upper air chamber 3.10 and the lower air chamber 3.12 are supplied with air independently, and the piston is driven bidirectionally through the air pressure difference. The thrust is stable and reliable, the dual air chambers are precisely controlled, and the probability of misoperation is low.

[0042] In the embodiments, such as Figure 3 , Figure 4 As shown, the main valve chamber 3 is provided with a first sealing ring 5 for isolating the upper transition chamber 3.3 and the upper air chamber 3.10, and a second sealing ring 6 for isolating the lower air chamber 3.12 and the liquid inlet chamber 3.4. The outer peripheral wall of the piston section 4.3 is provided with a third sealing ring 7 corresponding to the piston chamber 3.11. The first sealing ring 5 isolates the liquid from the upper air chamber 3.10, and the second sealing ring 6 isolates the liquid from the lower air chamber 3.12, completely blocking the risk of gas-liquid mixing and achieving zero crossflow of the medium. The third sealing ring 7 strengthens the piston dynamic seal and maintains the seal integrity under frequent reversing conditions.

[0043] In the embodiments, such as Figure 3 , Figure 4 As shown, the upper valve port 3.2 is provided with a fourth sealing ring 8 corresponding to the upper valve stem 4.1, and the lower valve port 3.5 is provided with a fifth sealing ring 9 corresponding to the lower valve stem 4.2. The fourth sealing ring 8 and the fifth sealing ring 9 are directly embedded in the upper valve port 3.2 and the lower valve port 3.5, forming a self-reinforcing seal under the compression of the conical valve stem. This seal has strong pressure resistance and higher reliability than a planar seal.

[0044] In the embodiments, such as Figure 3 , Figure 4As shown, at the mating surface between the upper valve body 1 and the lower valve body 2, a sixth sealing ring 10 is provided corresponding to the main valve cavity 3, and a seventh sealing ring 11 is provided corresponding to the bypass passage 3.9. The sixth sealing ring 10 seals the main valve cavity 3, and the seventh sealing ring 11 seals the bypass passage 3.9. This dual-channel independent sealing solves the problem of capillary leakage at the parting surface. The sixth sealing ring 10 and the seventh sealing ring 11 can also compensate for valve body machining errors and reduce assembly precision requirements.

[0045] Obviously, the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Other obvious variations or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A pneumatic directional valve, characterized in that, It includes an upper valve body (1) and a lower valve body (2) assembled as one piece, and the two form a main valve chamber (3) inside, and a linkage core (4) is slidably assembled in the main valve chamber (3). The main valve chamber (3) is divided into upper and lower sections. The upper section is divided into a liquid outlet (3.1), an upper valve port (3.2), and an upper transition chamber (3.3) along the axial direction. The lower section is divided into a liquid inlet chamber (3.4), a lower valve port (3.5), a lower transition chamber (3.6), and a main liquid outlet (3.7) along the axial direction. The liquid inlet chamber (3.4) is provided with a liquid inlet (3.8). A bypass (3.9) is provided between the upper transition chamber (3.3) and the lower transition chamber (3.6). The linkage core (4) includes a linkage upper valve rod (4.1), a lower valve rod (4.2), and a pneumatic component. The upper valve rod (4.1) cooperates with the upper valve port (3.2) to form an upper valve, controlling the opening and closing between the liquid outlet (3.1) and the upper transition chamber (3.3). The lower valve rod (4.2) cooperates with the lower valve port (3.5) to form a lower valve, controlling the opening and closing between the lower transition chamber (3.6) and the liquid inlet chamber (3.4). When the pneumatic component is driven by air pressure, it simultaneously drives the upper valve and the lower valve to perform alternating opening and closing actions, forming two working states: ① Liquid inlet state: The upper valve is closed and the lower valve is open. Liquid flows from the liquid inlet hole (3.8) through the liquid inlet chamber (3.4) and the lower transition chamber (3.6) to the main liquid inlet hole (3.7). ② Liquid discharge state: The upper valve is open and the lower valve is closed. Liquid flows from the main liquid hole (3.7) through the lower transition chamber (3.6), the connecting bypass (3.9), and the upper transition chamber (3.3) to the liquid discharge hole (3.1).

2. The pneumatic directional valve according to claim 1, characterized in that: The upper valve stem (4.1) and the lower valve stem (4.2) have the same diameter and stroke length.

3. The pneumatic directional valve according to claim 1, characterized in that: The upper valve stem (4.1) and the lower valve stem (4.2) are provided with tapered heads at their ends.

4. The pneumatic directional valve according to any one of claims 1-3, characterized in that: The main valve chamber (3) is also provided with a middle section, which is divided into an upper air chamber (3.10), a piston chamber (3.11) and a lower air chamber (3.12) along the axial direction. The pneumatic component is a piston section (4.3), and the upper valve stem (4.1), the piston section (4.3), and the lower valve stem (4.2) form an integrated linkage core (4). The piston section (4.3) is sealed and assembled in the piston chamber (3.11), with its upper and lower end faces exposed to the upper air chamber (3.10) and lower air chamber (3.12) respectively. The upper air chamber (3.10) and lower air chamber (3.12) are respectively provided with an upper air hole (3.13) and a lower air hole (3.14) for introducing driving gas to act on both ends of the piston section (4.3).

5. The pneumatic directional valve according to claim 4, characterized in that: The main valve chamber (3) is provided with a first sealing ring (5) for isolating the upper transition chamber (3.3) and the upper air chamber (3.10), and a second sealing ring (6) for isolating the lower air chamber (3.12) and the liquid inlet chamber (3.4). The outer peripheral wall of the piston section (4.3) is provided with a third sealing ring (7) corresponding to the piston chamber (3.11).

6. The pneumatic directional valve according to claim 1, characterized in that: The upper valve port (3.2) is provided with a fourth sealing ring (8) corresponding to the upper valve stem (4.1), and the lower valve port (3.5) is provided with a fifth sealing ring (9) corresponding to the lower valve stem (4.2).

7. The pneumatic directional valve according to claim 1, characterized in that: At the joint surface between the upper valve body (1) and the lower valve body (2), a sixth sealing ring (10) is provided corresponding to the main valve cavity (3), and a seventh sealing ring (11) is provided corresponding to the connecting bypass (3.9).

Images