Pneumatic control two-way piston valve

Abstract

The utility model belongs to the technical field of fluid valves, and particularly relates to a pneumatic control two-way piston valve, which comprises a valve body, a piston rod, a piston rod, a piston rod and a piston rod, the valve element is arranged in the cavity, and pressing rings are arranged at the two ends of the valve element correspondingly; a positioning ring is arranged on the periphery of the valve core; the magnetism isolating pipe is connected to the valve body in a sealed mode through a valve element connector, and a static iron core and a movable iron core are arranged in an inner hole of the magnetism isolating pipe; one end of the air source inlet is communicated with the atmosphere, and the other end of the air source inlet is communicated with the area where the bottom end of the static iron core is located; the air outlets are arranged at intervals relative to the air source inlet; the two sets of leather cups are arranged on the periphery of the valve element in a sleeving mode, inner rings of the leather cups are fixedly connected to the valve element through pressing rings, and outer rings of the leather cups are fixedly connected to the valve body through limiting rings; and the spring is sleeved on the periphery of the valve core. Therefore, the problems that in the prior art, a fluid valve is complex in structure, slow in reaction and poor in working reliability are solved.

Description

Technical Field

[0001] This utility model belongs to the field of fluid valve technology, specifically relating to a pneumatically controlled two-way piston valve. Background Technology

[0002] Existing valve control structures typically consist of components such as solenoid valves, cylinders, valve bodies, and limit switches. Their technical implementation suffers from the following drawbacks:

[0003] 1. Complex structure and complicated installation: The existing mechanism requires multiple independent components such as solenoid valves, cylinders, and limit switches, resulting in a large overall size and numerous parts. Furthermore, the air circuit connections need to be configured among multiple components, leading to inconvenient air circuit layout and cumbersome installation procedures, increasing the difficulty of system integration and maintenance.

[0004] 2. Limited valve operating speed: In existing technologies, the valve operating speed is limited by two factors. Traditional cylinders use gas compression to drive the valve, resulting in a slow response speed and making it difficult to achieve rapid valve opening and closing. In order to ensure sealing, the valve packing needs to tightly wrap the valve core, which leads to a significant increase in static friction between the valve core and the packing. Especially in the initial stage of valve opening and closing, additional power is required to overcome static friction resistance, further prolonging the operating time.

[0005] 3. Insufficient sealing reliability and durability: Traditional cylinders rely on sealing rings to achieve piston sealing. However, these sealing rings must withstand sliding friction over a long period, making them susceptible to deterioration in sealing performance due to temperature changes, wear, and other operating conditions. Sealing failure not only reduces cylinder drive efficiency but also exacerbates fluctuations in valve actuation speed, affecting control stability.

[0006] 4. Positioner Control Accuracy Defects: When a valve is equipped with a positioner for opening adjustment, the switching between static friction and sliding friction can cause nonlinear jump phenomena. For example, during the adjustment from 50% to 30%, the positioner needs to continuously increase the air pressure to overcome the static friction resistance between the valve core and the packing, at which point the valve core is in a stagnant state. When the pressure exceeds the static friction critical value, the valve core suddenly shifts to a 25% opening due to a sharp drop in sliding friction resistance. Subsequently, the positioner needs to repeatedly correct the air pressure to stabilize the target opening, causing the valve core to continuously vibrate around 30%. This phenomenon not only affects control accuracy but also accelerates the wear of mechanical components.

[0007] In view of the defects in the valve control structure of the existing technology, a more reasonable technical solution is needed to improve or solve the above-mentioned technical problems. Utility Model Content

[0008] The purpose of this invention is to provide a pneumatically controlled two-way piston valve to solve the problems of complex structure, slow response, and poor reliability of fluid valves in the prior art.

[0009] To achieve the above objectives, this utility model provides a pneumatically controlled two-way piston valve, comprising:

[0010] The valve body has a cavity with its axis parallel to a first direction. An air inlet base and an air outlet plug cone are respectively provided at both ends of the cavity. An air outlet channel is provided on the side wall of the air outlet plug cone.

[0011] The valve core is formed as a hollow cylindrical structure. The valve core is coaxially disposed in the cavity, and the two ends of the valve core are respectively provided with pressure rings that are adapted to the air inlet base and the air outlet plug cone; the outer periphery of the valve core is provided with a positioning ring that seals against the inner wall of the valve core.

[0012] A magnetic shielding tube is sealed to the valve body via a valve core connector. The inner bore of the magnetic shielding tube contains a stationary iron core and a moving iron core. The stationary iron core is fixedly located at the upper end of the magnetic shielding tube, and the moving iron core is movably located at the lower end of the stationary iron core. The stationary iron core has an exhaust port communicating with the atmosphere, and an air gap is formed between the moving iron core and the inner wall of the magnetic shielding tube. The lower end of the moving iron core protrudes from the magnetic shielding tube, and this protruding end is pressed against the valve core connector by an elastic element. The valve body has an air source inlet, a breather, and an exhaust port. One end of the air source inlet is connected to the atmosphere, and the other end is connected to the area where the bottom end of the stationary iron core is located. The two ends of the breather are respectively connected to the atmosphere and the cavity. The exhaust ports are spaced apart from the air source inlet.

[0013] Two sets of rubber cups are configured and fitted around the outer periphery of the valve core. The inner ring of each rubber cup is fixedly connected to the valve core via a pressure ring, and the outer ring of each rubber cup is fixedly connected to the valve body via a limiting ring. The area between the two rubber cups forms an inflation chamber.

[0014] A spring is sleeved on the outer periphery of the valve core, with its two ends abutting against the positioning ring and the limiting ring, respectively.

[0015] When the coil surrounding the magnetic valve is de-energized, the moving iron core moves downward and blocks the air inlet, creating a venting gap between the stationary iron core and the moving iron core. The air outlet, air gap, and exhaust port are connected to the atmosphere. External gas enters the inflation chamber where the spring is located through the vent on the valve body. At this time, the air pressure in this area is greater than the atmospheric pressure. Under the action of pressure, the valve core moves toward the air outlet blocking cone, causing the pressure ring on the valve core to seal against the air outlet blocking cone. At this time, the medium flow channel is in a closed state.

[0016] When the coil is energized, the moving iron core and the stationary iron core attract each other, making the air source inlet open. The area between the air source inlet, the air outlet, the positioning ring, and the cup together forms a high-pressure air chamber. External gas enters the inflation chamber between the positioning ring and the cup from the breather on the valve body. At this time, the pressure in this area is atmospheric pressure. The air pressure in the high-pressure air chamber is greater than atmospheric pressure, causing the valve core to move towards the air inlet base under pressure, and the medium flow channel opens.

[0017] In one possible design, the valve body surface located below the moving iron core has a first raised portion, the top surface of the first raised portion is a plane, and the air source inlet passes through the first raised portion;

[0018] And / or, the bottom surface of the stationary iron core is provided with a second raised portion, and the vent hole passes through the second raised portion;

[0019] The upper and lower ends of the moving iron core are respectively provided with sealing blocks made of flexible material.

[0020] In one possible design, mounting holes are provided at both ends of the moving iron core, and a sealing block is sealed and embedded in each mounting hole.

[0021] In one possible design, the vent includes a large-diameter section and a small-diameter section communicating with the large-diameter section, the small-diameter section being located at one end close to the moving iron core.

[0022] In one possible design, the stationary iron core is interference-fitted into the magnetic shielding tube, and the stationary iron core is welded to the magnetic shielding tube.

[0023] In one possible design, the vent plug cone is provided with a sealing groove that matches the pressure ring, and a sealing gasket is provided in the sealing groove.

[0024] In one possible design, the air intake base is provided with an L-shaped air intake channel, the lateral section of which faces the leather cup.

[0025] In one possible design, the positioning ring has a positioning groove, and the positioning groove has an annular sealing ring.

[0026] In one possible design, the elastic element is configured as a disc spring, and the lower end of the moving iron core is provided with an annular boss. The small-diameter end of the disc spring sleeve abuts against the boss, and the large-diameter end abuts against the valve core connector.

[0027] In one possible design, the vent plug cone includes a positioning plate, a support arm, and a base plate, wherein multiple support arms are provided, and both ends of the support arms are fixedly connected to the positioning plate and the base plate, respectively.

[0028] The positioning plate is fixedly connected to the valve core, and the base plate is positioned facing the valve core.

[0029] Compared to traditional valve control structures that consist of multiple independent components such as piston valves, cylinders, and limit switches, this pneumatically controlled two-way piston valve integrates all related functions into a single integrated design. The valve body, valve core, magnetic shielding tube, and other components work together, reducing the number of independent parts, effectively shrinking the overall size, simplifying the pneumatic circuit layout, avoiding complex pneumatic connections between multiple components, greatly reducing the complexity of the installation process, improving the convenience of system integration and the efficiency of subsequent maintenance, and reducing potential malfunctions caused by structural complexity.

[0030] By coordinating the various components within the piston valve, the slow response speed issue inherent in traditional cylinders that rely solely on gas compression for actuation is avoided. The combination of electromagnetic drive and pneumatic pressure enables more rapid valve opening and closing. Furthermore, its unique structural design optimizes the stress distribution between the valve core and packing, reducing the static friction resistance that the valve core must overcome during the initial opening and closing phases, thus lowering additional power consumption and further shortening the valve's actuation time. This allows for rapid valve opening and closing, meeting the demands of operating conditions requiring high valve actuation speed.

[0031] The above technical solution changes the traditional cylinder's reliance on sealing rings for piston sealing. Through the rational coordination of components such as the piston cup, positioning ring, and spring, as well as the unique sealing structure design between the valve core and valve body, the adverse effects of sliding friction and temperature changes on sealing performance are reduced. During long-term operation, it effectively maintains good sealing performance, avoiding problems such as reduced cylinder drive efficiency and valve operating speed fluctuations caused by seal failure. This improves the control stability of the entire valve control structure and extends its service life.

[0032] The structure and operation of this piston valve effectively avoid the nonlinear jump phenomenon caused by the switching between static and sliding friction when using a positioner in traditional valves. During valve opening adjustment, the valve core displacement can respond more smoothly and accurately to the positioner's control signal, without sudden displacement or continuous vibration of the valve core near the target opening due to changes in friction. This significantly improves the positioner's control accuracy of the valve opening, reduces wear on mechanical parts caused by frequent correction actions, and further ensures the long-term stable and accurate operation of the valve control structure. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a three-dimensional structural schematic diagram of the pneumatically controlled two-way piston valve provided by this utility model in one embodiment;

[0035] Figure 2 This is a cross-sectional view of one embodiment of the pneumatically controlled two-way piston valve provided by this utility model;

[0036] Figure 3 This is a cross-sectional view of the pneumatically controlled two-way piston valve provided by this utility model in the closed state;

[0037] Figure 4 This is a cross-sectional view of the pneumatically controlled two-way piston valve provided by this utility model in the closed state. Figure 4 and Figure 3 The sectional views are different;

[0038] Figure 5 This is a cross-sectional view of the pneumatically controlled two-way piston valve provided by this utility model in the closed state. Figure 5 Compared to Figure 3 , Figure 4 The cross-sectional views are all different;

[0039] Figure 6 This is a cross-sectional view of the pneumatically controlled two-way piston valve provided by this utility model in the air-ventilated state.

[0040] Figure 7 This is a cross-sectional view of the pneumatically controlled two-way piston valve provided by this utility model in the air-ventilated state. Figure 7 and Figure 6 The sectional views are different;

[0041] Figure 8 This is a cross-sectional view of the pneumatically controlled two-way piston valve provided by this utility model in the air-ventilated state. Figure 8 Compared to Figure 6 , Figure 7 The cross-sectional views are all different.

[0042] In the above attached figures: 1-valve body, 101-air source inlet, 102-breathing port, 103-air outlet, 11-air inlet base, 1101-air inlet channel, 12-air outlet plug cone, 120-air outlet channel, 121-positioning plate, 122-support arm, 123-base plate, 2-valve core, 21-positioning ring, 31-magnetic shielding tube, 32-valve core connector, 33-stationary iron core, 331-exhaust port, 332-second raised part, 34-moving iron core, 341-first raised part, 342-bore, 301-air gap, 41-skin cup, 42-pressure ring, 43-limiting ring, 400-inflation chamber, 5-spring, 6-sealing block. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that while the description of these embodiments is intended to aid in understanding the present invention, it does not constitute a limitation thereof. The specific structural and functional details disclosed herein are only for describing exemplary embodiments of the present invention. However, the present invention may be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0044] According to a specific embodiment of this utility model, a pneumatically controlled two-way piston valve is provided, wherein... Figures 1 to 8 A specific embodiment of the pneumatically controlled two-way piston valve is shown.

[0045] See Figures 1 to 8As shown, the pneumatically controlled two-way piston valve includes: a valve body 1, which has a cavity with its axis parallel to a first direction, and an inlet base 11 and an outlet plug cone 12 respectively at both ends of the cavity; an outlet channel 120 is provided on the side wall of the outlet plug cone 12; a valve core 2, which is formed as a hollow cylindrical structure, and is coaxially disposed in the cavity, with pressure rings 42 at both ends of the valve core 2 respectively adapted to the inlet base 11 and the outlet plug cone 12; a positioning ring 21 is provided on the outer periphery of the valve core 2 to seal against the inner wall of the valve core 2; a magnetic shielding tube 31, which is sealed to the valve body 1 through a valve core connector 32, and has a stationary iron core 33 and a moving iron core 34 in its inner hole, wherein the stationary iron core 33 is fixedly disposed at the upper end of the magnetic shielding tube 31, and the moving iron core 34 is movably disposed at the lower end of the stationary iron core 33; the stationary iron core 33 has an exhaust port 331 communicating with the atmosphere, and the moving iron core 34 is connected to the valve body 1 through a valve core connector 32. An air gap 301 is formed on the inner wall of the magnetic shielding tube 31; the lower end of the moving iron core 34 protrudes from the magnetic shielding tube 31 and the protruding end is pressed against the valve core connector 32 by an elastic element; the valve body 1 is provided with an air source inlet, a breather 102 and an air outlet 103, wherein one end of the air source inlet is connected to the atmosphere and the other end is connected to the area where the bottom end of the stationary iron core 33 is located; the two ends of the breather 102 are connected to the atmosphere and the cavity respectively; the air outlet 103 is spaced apart from the air source inlet; two sets of cups 41 are provided and sleeved on the outer periphery of the valve core 2, wherein the inner ring of the cup 41 is fixedly connected to the valve core 2 by a pressure ring 42, and the outer ring of the cup 41 is fixedly connected to the valve body 1 by a limiting ring 43; the area between the two cups 41 forms an air filling chamber 400; and a spring 5 is sleeved on the outer periphery of the valve core 2, with the two ends of the spring 5 abutting against the positioning ring 21 and the limiting ring 43 respectively.

[0046] It should be noted that for the directional terms appearing in this article, please refer to... Figure 2 The directions shown in the diagram should be interpreted as follows: The first direction is the axial direction of the valve core, also known as the X-axis in the diagram. The direction of the vertical movement of the moving iron core is the second direction, also known as the Z-axis in the diagram, and the second direction is perpendicular to the first direction. It should be noted that this direction will change depending on the overall position of the piston valve, but this does not affect the understanding of the orientation.

[0047] When the coil surrounding the magnetic valve is de-energized, the moving iron core 34 moves down and blocks the air inlet. A ventilated gap is formed between the stationary iron core 33 and the moving iron core 34. The air outlet 103, air gap 301, gap and exhaust port 331 are connected to the atmosphere. External gas enters the air chamber 400 where the spring 5 is located from the breather 102 on the valve body 1. At this time, the air pressure in this area is greater than the atmospheric pressure. Under the action of pressure, the valve core 2 moves toward the air outlet blocking cone 12, and the pressure ring 42 on the valve core 2 seals against the air outlet blocking cone 12. At this time, the medium flow channel is in a closed state.

[0048] When the coil is energized, the moving iron core 34 and the stationary iron core 33 are attracted together, making the air source inlet open. The area between the air source inlet, the air outlet 103, the positioning ring 21, and the cup 41 together forms a high-pressure air chamber. External gas enters the air filling chamber 400 between the positioning ring 21 and the cup 41 from the breather 102 on the valve body 1. At this time, the pressure in this area is atmospheric pressure. The air pressure in the high-pressure air chamber is greater than the atmospheric pressure, causing the valve core 2 to move toward the air inlet base 11 under the action of pressure. The medium flow channel is opened, and the piston valve is in the venting state.

[0049] This pneumatically controlled two-way piston valve controls the opening and closing of the valve by electromagnetic drive and the displacement of the valve core 2 under air pressure. Its core lies in utilizing the changes in the airflow caused by the interaction between the stationary iron core 33 and the moving iron core 34 within the magnetically shielded tube 31 when the coil is energized or de-energized. This affects the air pressure environment 42 of the valve core 2, causing the valve core 2 to move axially relative to the valve body 1 with the help of components such as the spring 5, thereby controlling the flow of the medium.

[0050] When the coil surrounding the magnetic valve is de-energized, the moving iron core 34 moves downward under the action of its own structure and elastic element, blocking the air inlet. At this time, a gap is formed between the stationary iron core 33 and the moving iron core 34, allowing gas to pass through. The air outlet 103, this gap, and the exhaust port 331 are connected to the atmosphere. External gas enters the inflation chamber 400 where the spring 5 is located through the breather 102 on the valve body 1. The air pressure here is higher than atmospheric pressure, causing the valve core 2 to move towards the air outlet blocking cone 12 under the force of the air pressure. The pressure ring 42 on the valve core 2 then seals and presses against the air outlet blocking cone 12, closing the medium flow channel and putting the valve in the closed state, preventing the medium from passing through.

[0051] When the coil is energized, the stationary iron core 33 and the moving iron core 34 engage, opening the air inlet. The area formed by the air inlet, outlet 103, positioning ring 21, and cup 41 becomes a high-pressure air chamber. External gas enters the inflation chamber 400 between the positioning ring 21 and cup 41 through the breather 102 on the valve body 1. At this time, the inflation chamber 400 is at atmospheric pressure. However, the air pressure in the high-pressure air chamber is higher than atmospheric pressure due to the access of the air source. Under the force generated by the pressure difference between the high-pressure air chamber and the inflation chamber 400, the valve core 2 overcomes the resistance of the spring 5 and other components, moving towards the air inlet base 11, thus opening the medium flow channel and allowing the medium to flow smoothly, putting the valve in the open state.

[0052] Compared to traditional valve control structures that consist of multiple independent components such as piston valves, cylinders, and limit switches, this pneumatically controlled two-way piston valve integrates related functions into a single integrated design. The valve body 1, valve core 2, magnetic shielding tube 31, and other components work together, reducing the number of independent parts, effectively shrinking the overall size, simplifying the pneumatic circuit layout, avoiding complex pneumatic connections between multiple components, greatly reducing the complexity of the installation process, improving the convenience of system integration and the efficiency of subsequent maintenance, and reducing potential malfunctions caused by structural complexity.

[0053] By coordinating the various components within the piston valve, the slow response speed issue inherent in traditional cylinders that rely solely on gas compression for actuation is avoided. The combination of electromagnetic drive and pneumatic pressure enables more rapid valve opening and closing responses. Furthermore, its unique structural design optimizes the stress distribution between the valve core 2 and the packing, reducing the static friction resistance that the valve core 2 needs to overcome during the initial opening and closing phases, thus lowering additional power consumption and further shortening the valve's actuation time. This enables rapid valve opening and closing, meeting the demands of operating conditions requiring high valve actuation speed.

[0054] The above technical solution changes the traditional cylinder's reliance on sealing rings for piston sealing. Through the rational coordination of components such as the piston cup 41, positioning ring 21, and spring 5, as well as the unique sealing structure design between the valve core 2 and valve body 1, the adverse effects of sliding friction and temperature changes on sealing performance are reduced. During long-term operation, it effectively maintains good sealing performance, avoiding problems such as reduced cylinder drive efficiency and valve operating speed fluctuations caused by seal failure. This improves the control stability of the entire valve control structure and extends its service life.

[0055] The structure and operation of this piston valve effectively avoid the nonlinear jump phenomenon caused by the switching between static and sliding friction when using a positioner in traditional valves. During valve opening adjustment, the displacement of the valve core 2 can respond to the positioner's control signal more smoothly and accurately, without sudden displacement or continuous vibration of the valve core 2 near the target opening due to changes in friction. This significantly improves the positioner's control accuracy of the valve opening, reduces wear on mechanical parts caused by frequent correction actions, and further ensures the long-term stable and accurate operation of the valve control structure.

[0056] In this disclosure, the magnetic shielding tube is detachably connected to the valve body via a valve core connector. This allows the magnetic shielding tube, stationary iron core, moving iron core, and elastic element (disc spring) to form a modular structure. When the magnetic shielding valve is removed, the air supply inlet can be directly connected to the high-pressure chamber of the valve core, and a separate two-position three-way valve body can be used to control the valve's opening and closing. When the valve size increases, the valve core chamber size also increases, and insufficient air passage diameter can lead to slow operation. Using a replaceable two-position three-way valve block can improve the air passage diameter, allowing larger diameter valves to operate faster.

[0057] The modular design makes the solenoid valve system more flexible and scalable. Users can easily replace or upgrade modules to adapt to different working conditions and requirements. For example, when a larger flow rate or higher pressure is needed, a larger diameter two-position three-way valve block can be used instead of replacing the entire solenoid valve system.

[0058] In one embodiment provided in this disclosure, the valve body 1 located below the moving iron core 34 has a first raised portion 341 on its surface, and the air source inlet passes through the first raised portion 341; the bottom surface of the stationary iron core 33 has a second raised portion 332, and the exhaust hole 331 passes through the second raised portion 332; the upper end and lower end of the moving iron core 34 are respectively provided with sealing blocks 6 made of flexible material.

[0059] This design makes the air source inlet placement more reasonable, facilitating air circuit connectivity and control. It also optimizes the overall structure of valve body 1 to some extent, allowing the air source inlet to better connect with the internal air circuit system, ensuring that gas can smoothly enter the corresponding area and provide the power basis for subsequent valve operation. By placing the exhaust port 331 in the second raised portion 332, the position of the exhaust port 331 is more reasonable, which is conducive to gas discharge and avoids gas accumulation in parts such as the air gap 301 between the stationary iron core 33 and the moving iron core 34, thereby affecting the normal operation of the piston valve.

[0060] The sealing block 6 is made of a flexible material, which allows it to better adapt to the contact and movement between the moving iron core 34 and other components, achieving a good sealing effect. Sealing blocks 6 are installed at both the upper and lower ends of the moving iron core 34 to effectively prevent gas leakage from the gap between the moving iron core 34 and surrounding components, ensuring the airtightness of the gas circuit system.

[0061] During the operation of the piston valve, whether the coil is de-energized or energized, the sealing block 6 can tightly fit the corresponding parts to prevent gas leakage from causing abnormal valve operation or reduced control accuracy, thereby improving the working stability and reliability of the piston valve and extending its service life.

[0062] Furthermore, mounting holes are provided at both the upper and lower ends of the moving iron core 34, and a sealing block 6 is sealed and embedded in each mounting hole. The sealing and embedding method ensures a stable connection between the sealing block 6 and the moving iron core 34, preventing the sealing block 6 from loosening or shifting due to vibration or other reasons during the operation of the piston valve, and ensuring that the sealing block 6 can always effectively perform its sealing function.

[0063] By embedding the sealing block 6 in the mounting hole, the sealing block 6 can better fit the contact surface between the moving iron core 34 and other components, forming an effective sealing structure. This installation method can effectively prevent gas leakage from the gaps at both ends of the moving iron core 34, further improving the sealing performance of the piston valve and ensuring the stable operation of the gas circuit system.

[0064] It should be noted that the sealing block can be configured as a rubber block, and the surface of the rubber block is flat, which can increase the contact area with the first raised part and the second raised part, thereby ensuring the sealing effect.

[0065] Furthermore, the top surface of the first raised portion 341 is flat, which makes the contact between the air source inlet and components such as the valve body 1 more stable and flat when the air source inlet passes through the raised portion. This is beneficial for sealing and fixing the air source inlet and avoids problems such as gas leakage caused by uneven contact surfaces. Similarly, the bottom surface of the second raised portion 332 is flat, which makes the connection and cooperation between the exhaust port 331 and related components such as the stationary iron core 33 more tight and stable after the exhaust port 331 is inserted. This ensures the smoothness and reliability of the exhaust process and prevents gas leakage or obstruction around the exhaust port 331.

[0066] The term "and / or" that may appear in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously.

[0067] In one exemplary implementation provided in this fair and open disclosure, see [link / reference]. Figures 2 to 8 As shown, the exhaust port 331 includes a large-diameter section and a small-diameter section connected to the large-diameter section, with the small-diameter section located at one end near the moving iron core 34. The arrangement of the large-diameter and small-diameter sections can adjust the gas flow rate and volume, ensuring the stability and controllability of the gas during the exhaust process. When the electromagnetic coil is energized, the stationary iron core 33 generates magnetic force, attracting the moving iron core 34 tightly. The exhaust sealing gasket on the moving iron core 34 presses against the exhaust port 331 of the stationary iron core 33, closing it and thus controlling the gas flow.

[0068] Specifically, the stationary iron core is inserted into the magnetic shielding tube with an interference fit, and the stationary iron core is welded to the magnetic shielding tube. In this disclosure, the stationary iron core, the magnetic shielding tube, and the moving iron core together constitute the main working magnetic circuit of the piston valve. The working stroke (air gap) and the area around the iron core magnetic circuit are non-magnetic, allowing the working magnetic flux to flow towards the iron core with less magnetic leakage, thereby improving the working efficiency and performance of the piston valve.

[0069] By employing a dual connection method of interference fit and welding, the connection between the stationary iron core and the magnetic shielding tube is made more robust and reliable. This effectively prevents the stationary iron core from loosening or shifting due to vibration or other external forces during piston valve operation, ensuring the stability of the internal structure of the piston valve and contributing to its improved service life and reliability. Furthermore, this connection method helps maintain the cleanliness of the piston valve's interior, preventing impurities from entering the magnetic circuit and affecting its normal operation. It also prevents media leakage, ensuring the piston valve's sealing performance.

[0070] This helps to ensure unobstructed magnetic circuit between the stationary and moving iron cores. When the solenoid coil of the piston valve is energized or de-energized, it can quickly generate or eliminate magnetic force, thereby rapidly attracting or releasing the moving iron core, achieving rapid response of the piston valve and improving its working efficiency.

[0071] In one embodiment provided by this fair provision, the vent plug cone is provided with a sealing groove adapted to the pressure ring, and a sealing gasket is provided in the sealing groove. When the valve core moves toward the vent plug cone, the end face of the valve core can press against the sealing gasket, and the sealing gasket will deform to fill and adapt to the shape of the connection surface, thereby maintaining an effective sealing effect. In addition, the sealing gasket can also act as a buffer material to reduce the stress and vibration of the connection part due to vibration and impact, thereby absorbing and dispersing vibration and impact energy, protecting the connection part from damage, and maintaining stable sealing performance.

[0072] Furthermore, the end face of the valve core is configured with a smooth curved surface. In one embodiment provided in this disclosure, the end face of the valve core is configured with a smooth curved surface. The smooth curved surface can better contact the sealing gasket, reduce surface roughness and unevenness, thereby improving sealing performance and preventing media leakage. The smooth curved surface can reduce the gap between the valve core and the sealing gasket, ensuring that the sealing gasket can uniformly fill these gaps when compressed, forming a tighter seal. At the same time, the smooth curved surface can reduce the resistance of the valve core during movement, making the movement of the valve core smoother, thereby improving the working reliability of the solenoid valve. When energized and de-energized, the valve core can move to the designated position more quickly and accurately, ensuring that the opening and closing actions of the valve are more stable and reliable.

[0073] In this disclosure, the intake base 11 is provided with an L-shaped intake channel 1101, the transverse section of which faces the piston cup 41. This allows external gas to enter the piston valve along a predetermined path, effectively guiding the gas flow and ensuring that the gas accurately enters the area associated with the piston cup 41, providing the necessary power support for subsequent valve operation. Furthermore, the L-shaped channel design avoids excessive turbulence or eddies during gas entry, reducing energy loss and improving gas flow efficiency and stability. The cooperation between the pressure ring and the intake base acts as a limit, restricting the movement range of the valve core and preventing excessive movement that could damage the piston cup. Additionally, this cooperative structure prevents the valve core from tilting, allowing it to move smoothly and accurately along the axial direction, thus ensuring sealing performance.

[0074] The transverse section of the air inlet channel 1101 is directly aligned with the piston cup 41, allowing the gas to directly act on the area where the piston cup 41 is located, creating a certain gas pressure. When the valve is closed, the gas forms a seal at the piston cup 41, preventing media leakage. This design fully utilizes gas pressure to enhance the sealing effect, ensuring good sealing performance of the valve in the closed state, preventing media leakage from the valve, and improving the reliability and safety of the piston valve.

[0075] In this disclosure, the positioning ring 21 has a positioning groove, and an annular sealing ring is provided in the positioning groove for sealing against the inner wall of the valve body 1. The positioning groove in the positioning ring 21 is used to install the annular sealing ring, which abuts against the inner wall of the valve body 1, effectively preventing gas or liquid from leaking from the gap between the positioning ring 21 and the inner wall of the valve body 1. This sealing structure can ensure the airtightness or liquid tightness of the piston valve, guarantee the normal operation of the piston valve, and avoid problems such as control failure or safety hazards caused by leakage.

[0076] The sealing ring fits tightly against the inner wall of the valve body 1 within the positioning groove, maintaining a good sealing effect even under conditions such as pressure changes or vibration. The positioning groove design makes the sealing ring more stable during installation and operation, preventing displacement or deformation, thereby improving the reliability and durability of the seal and extending the service life of the piston valve.

[0077] The positioning groove provides a dedicated installation position for the sealing ring, making its installation more convenient and accurate. When the sealing ring needs to be replaced, the operation can be performed quickly and easily, reducing maintenance costs and difficulty, improving the maintainability of the piston valve, and contributing to its stable operation during long-term use.

[0078] By incorporating a positioning groove and a sealing ring in the positioning ring 21, the structural design of the piston valve can be simplified, reducing the use of other auxiliary sealing components. This design makes the piston valve structure more compact and rational, which is beneficial for improving the performance and efficiency of the piston valve, while also reducing production costs.

[0079] It should be noted that the positioning ring 21 is formed on the outer periphery of the valve core, that is, the positioning ring and the valve core are integrally formed. This design helps to ensure the strength between the two, and also facilitates production and assembly.

[0080] In this disclosure, the elastic element is configured as a disc spring (not shown in the figure). The lower end of the moving iron core 34 is provided with an annular boss 342. The small-diameter end of the disc spring sleeve abuts against the boss 342, and the large-diameter end abuts against the valve core connector 32. As an elastic element, the disc spring can provide elastic force between the moving iron core 34 and the valve core connector 32. When the piston valve is working, the elastic force of the disc spring can ensure a tight contact between the moving iron core 34 and the valve core connector 32, so that the moving iron core 34 can work stably.

[0081] Specifically, the disc spring has a high elastic modulus and a small deformation, enabling it to generate a large elastic force in a short time. When the solenoid coil of the piston valve is energized or de-energized, the disc spring can quickly push the moving iron core 34 towards or away from the valve core connector 32, achieving a rapid response of the piston valve and improving its working efficiency. Compared with the traditional spring 5, the disc spring has higher strength and stiffness, and can withstand greater loads and pressures, thereby improving the reliability and service life of the piston valve.

[0082] In this disclosure, see Figures 2 to 8 As shown, the protruding end of the moving iron core 34 is formed into a variable-diameter structure adapted to the disc spring. This allows for better adaptation to the disc spring, thereby reducing the offset / chatter of the moving iron core during movement and enabling the moving iron core to move smoothly and accurately along the second direction (Z direction). The annular boss 342 formed at the lower end of the moving iron core 34 provides positioning and support for the disc spring. The small-diameter end of the disc spring presses against the boss 342, which ensures that the disc spring maintains a stable position during operation, preventing the disc spring from offsetting or falling off, thus ensuring the normal operation of the disc spring.

[0083] The design of the boss 342 makes the installation of the disc spring more convenient and quick. During assembly, the disc spring can be directly fitted onto the boss 342, and then the moving iron core 34 can be installed onto the valve core connector 32 without the need for additional positioning devices or tools. This not only improves assembly efficiency but also reduces assembly costs. At the same time, during maintenance, the boss 342 also facilitates the disassembly and replacement of the disc spring, improving the maintainability of the piston valve.

[0084] In one embodiment provided in this disclosure, the air outlet plug cone 12 includes a positioning plate 121, a support arm 122 and a base plate 123. Multiple support arms 122 are provided, and their two ends are respectively fixedly connected to the positioning plate 121 and the base plate 123. The positioning plate 121 is fixedly connected to the valve core 2, and the base plate 123 is disposed facing the valve core 2.

[0085] When the valve is closed, the valve core 2 moves and contacts the base plate 123 of the outlet plug cone 12. The base plate 123 blocks the valve core 2, thus closing the medium flow channel. The positioning plate 121 is fixedly connected to the valve core 2 to ensure the accurate relative position between the outlet plug cone 12 and the valve core 2. The support arm 122 connects and supports the positioning plate 121 and the base plate 123, ensuring the overall structural stability of the outlet plug cone 12.

[0086] It should be noted that in this disclosure, the positioning plate 121, the support arm 122, and the base plate 123 are integrally formed, which can ensure the strength and precision of the overall structure, facilitate assembly, and at the same time, can better match with the valve core to ensure that the valve can be opened and closed effectively.

[0087] Based on the structural design of the vent plug cone 12 having multiple support arms 122 evenly distributed along the circumference, the force can be evenly distributed, avoiding deformation or damage to the vent plug cone 12 due to excessive local force, thereby ensuring that the valve can reliably withstand the medium pressure in the closed state, and improving the service life and safety of the valve.

[0088] The fixed connection between the positioning plate 121 and the valve core 2, and the connection between the support arm 122 and the positioning plate 121 and the base plate 123, make the assembly between the outlet plug cone 12 and the valve core 2 more precise and secure. This structural design helps improve the assembly accuracy of the valve, reduces problems such as poor valve sealing caused by assembly errors, enhances the reliability and stability of the valve, and ensures that the valve can work normally under various operating conditions. The structure is relatively simple, easy to process and manufacture, and reduces production costs. At the same time, when the valve needs maintenance or component replacement, this structure also facilitates disassembly and inspection, which helps to detect and deal with problems in a timely manner, improves the maintainability of the valve, and reduces downtime and maintenance costs.

[0089] Finally, it should be noted that this utility model is not limited to the above-described optional embodiments, and anyone can derive other various forms of products under the guidance of this utility model. The above specific embodiments should not be construed as limiting the scope of protection of this utility model, which should be determined by the claims, and the description can be used to interpret the claims.

Claims

1. A pneumatically controlled two-way piston valve, characterized in that, include: The valve body has a cavity with its axis parallel to a first direction. An air inlet base and an air outlet plug cone are respectively provided at both ends of the cavity. An air outlet channel is provided on the side wall of the air outlet plug cone. The valve core is formed as a hollow cylindrical structure. The valve core is coaxially disposed in the cavity, and the two ends of the valve core are respectively provided with pressure rings that are adapted to the air inlet base and the air outlet plug cone; the outer periphery of the valve core is provided with a positioning ring that seals against the inner wall of the valve core. A magnetic shielding tube is sealed to the valve body via a valve core connector. The inner bore of the magnetic shielding tube contains a stationary iron core and a moving iron core. The stationary iron core is fixedly located at the upper end of the magnetic shielding tube, and the moving iron core is movably located at the lower end of the stationary iron core. The stationary iron core has an exhaust port communicating with the atmosphere, and an air gap is formed between the moving iron core and the inner wall of the magnetic shielding tube. The lower end of the moving iron core protrudes from the magnetic shielding tube, and this protruding end is pressed against the valve core connector by an elastic element. The valve body has an air source inlet, a breather, and an exhaust port. One end of the air source inlet is connected to the atmosphere, and the other end is connected to the area where the bottom end of the stationary iron core is located. The two ends of the breather are respectively connected to the atmosphere and the cavity. The exhaust ports are spaced apart from the air source inlet. Two sets of rubber cups are configured and fitted around the outer periphery of the valve core. The inner ring of each rubber cup is fixedly connected to the valve core via a pressure ring, and the outer ring of each rubber cup is fixedly connected to the valve body via a limiting ring. The area between the two rubber cups forms an inflation chamber. A spring is sleeved on the outer periphery of the valve core, with its two ends abutting against the positioning ring and the limiting ring, respectively.

2. The pneumatically controlled two-way piston valve according to claim 1, characterized in that, The valve body surface located below the moving iron core has a first raised portion, the top surface of the first raised portion is a plane, and the air source inlet passes through the first raised portion; And / or, the bottom surface of the stationary iron core is provided with a second raised portion, and the vent hole passes through the second raised portion; The upper and lower ends of the moving iron core are respectively provided with sealing blocks made of flexible material.

3. The pneumatically controlled two-way piston valve according to claim 2, characterized in that, The moving iron core has mounting holes at both ends, and a sealing block is embedded in each mounting hole.

4. The pneumatically controlled two-way piston valve according to claim 1, characterized in that, The vent hole includes a large-diameter section and a small-diameter section connected to the large-diameter section, the small-diameter section being located at one end close to the moving iron core.

5. The pneumatically controlled two-way piston valve according to claim 1, characterized in that, The stationary iron core is inserted into the magnetic shielding tube with an interference fit, and the stationary iron core is welded to the magnetic shielding tube.

6. The pneumatically controlled two-way piston valve according to claim 1, characterized in that, The vent plug cone is provided with a sealing groove that matches the pressure ring, and a sealing gasket is provided in the sealing groove.

7. The pneumatically controlled two-way piston valve according to claim 1, characterized in that, The air intake base is provided with an L-shaped air intake channel, and the horizontal section of the air intake channel is directly opposite the leather cup.

8. The pneumatically controlled two-way piston valve according to claim 1, characterized in that, The positioning ring has a positioning groove, and the positioning groove has an annular sealing ring.

9. The pneumatically controlled two-way piston valve according to claim 1, characterized in that, The elastic element is configured as a disc spring, and the lower end of the moving iron core is provided with an annular boss. The small diameter end of the disc spring sleeve abuts against the boss, and the large diameter end abuts against the valve core connector.

10. The pneumatically controlled two-way piston valve according to claim 1, characterized in that, The vent plug cone includes a positioning plate, a support arm, and a base plate. Multiple support arms are provided, and their two ends are respectively fixedly connected to the positioning plate and the base plate. The positioning plate is fixedly connected to the valve core, and the base plate is positioned facing the valve core.

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