Pneumatic control two-way piston valve

Abstract

The invention belongs to the technical field of fluid valves, and particularly relates to an air-control two-way piston valve which comprises a valve body, 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] The invention belongs to the technical field of fluid valves, and in particular relates to an air-controlled two-way piston valve. Background Art

[0002] The existing valve control structure is usually composed of solenoid valve, cylinder, valve body, travel switch and other components, and its technical implementation has the following defects:

[0003] 1. Complex structure and difficult installation: The existing mechanism needs to be equipped with multiple independent components such as solenoid valves, cylinders and travel switches, resulting in a large overall volume and a large number of accessories. At the same time, the gas circuit connection needs to be configured between multiple components, which has problems such as inconvenient gas circuit layout and cumbersome installation procedures, increasing the difficulty of system integration and maintenance.

[0004] 2. Limited valve action speed: In the existing technology, the valve action speed is restricted by two factors. The traditional cylinder adopts gas compression drive, and its action response speed is slow, making it difficult to achieve rapid opening and closing of the valve; the valve packing needs to tightly wrap the valve core to ensure the sealing, resulting in a significant increase in the static friction between the valve core and the packing, especially in the initial stage of valve opening and closing, which requires additional power to overcome the static friction resistance, further prolonging the action time.

[0005] 3. Insufficient sealing reliability and durability: Traditional cylinders rely on sealing rings to achieve piston sealing, and the sealing rings need to withstand sliding friction for a long time, which can easily lead to a decrease in sealing performance due to temperature changes, wear and other working conditions. Seal failure will not only reduce the cylinder drive efficiency, but also aggravate the fluctuation of valve action speed and affect control stability.

[0006] 4. Positioner control accuracy defects: When the valve is equipped with a positioner for opening adjustment, the switching between static friction and sliding friction will cause nonlinear jump phenomenon. For example, in the process of adjusting the opening from 50% to 30%, the positioner needs to continuously increase the air pressure to overcome the static friction resistance of the valve core and the packing. At this time, the valve core is in a stagnant state; when the pressure exceeds the critical value of static friction, the valve core suddenly moves to 25% opening due to the sudden 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 continue to vibrate near 30%. This phenomenon not only affects the control accuracy, but also accelerates the wear of mechanical parts.

[0007] In view of the defects of the valve control structure in the prior art, a more reasonable technical solution needs to be provided to improve or solve the above technical problems. Summary of the invention

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

[0009] In order to achieve the above object, the present invention provides a gas-controlled two-way piston valve, comprising:

[0010] The valve body is provided with a cavity whose axis is parallel to the first direction, and an air inlet base and an air outlet plugging cone are respectively provided at two ends of the cavity; and an air outlet channel is provided on the side wall of the air outlet plugging cone;

[0011] The valve core is formed into a hollow cylindrical structure, the valve core is coaxially arranged in the cavity, and the two ends of the valve core are respectively provided with pressure rings 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 isolation tube is sealed and connected to the valve body through a valve core joint, and a static iron core and a moving iron core are provided in the inner hole of the magnetic isolation tube, wherein the static iron core is fixedly arranged at the upper end of the magnetic isolation tube, and the moving iron core is movably arranged at the lower end of the static iron core; an exhaust hole connected to the atmosphere is provided in the static iron core, and an air gap is formed between the moving iron core and the inner wall of the magnetic isolation tube; the lower end of the moving iron core protrudes from the magnetic isolation tube and the protruding end is pressed against the valve core joint through an elastic member; an air source inlet, a breathing port and an air outlet are provided on the valve body, 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 static iron core is located; the two ends of the breathing port are respectively connected to the atmosphere and the cavity; the air outlet is spaced relative to the air source inlet;

[0013] The leather cups are provided in two groups and are sleeved on the outer periphery of the valve core, wherein the inner ring of the leather cups is fixedly connected to the valve core via a pressure ring, and the outer ring of the leather cups is fixedly connected to the valve body via a limit ring; the area between the two leather cups forms an air-filled cavity; and,

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

[0015] Among them, when the coil sleeved on the outer periphery of the magnetic isolation valve loses power, the moving iron core moves down and blocks the air source inlet, and a ventilation gap is formed between the static iron core and the moving iron core, and the air outlet, air gap, gap and exhaust hole are connected to the atmosphere; the external gas enters the inflation cavity where the spring is located from the breathing port on the valve body, and the air pressure in this area is greater than the atmospheric pressure at this time. The valve core moves toward the air outlet plug cone under the action of pressure, and the pressure ring seal on the valve core is pressed against the air outlet plug cone, and the medium flow channel is in a closed state at this time;

[0016] When the coil is energized, the moving iron core and the static iron core are attracted to make the air source inlet conductive, and the air source inlet, the air outlet, and the area between the positioning ring and the leather cup together form a high-pressure air cavity; the external gas enters the inflation cavity between the positioning ring and the leather cup from the breathing port on the valve body. At this time, the area is at atmospheric pressure, and the air pressure in the high-pressure air cavity is greater than the atmospheric pressure, so that the valve core moves toward the air inlet base under the action of pressure, and the medium flow channel opens.

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

[0018] And / or, a second raised portion is provided on the bottom surface of the static iron core, and the exhaust hole penetrates through the second raised portion;

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

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

[0021] In a possible design, the exhaust hole includes a large-diameter section and a small-diameter section connected to the large-diameter section, and the small-diameter section is located at one end close to the moving iron core.

[0022] In a possible design, the static iron core is inserted into the magnetic isolation tube with an interference fit, and the static iron core is welded to the magnetic isolation tube.

[0023] In a possible design, a sealing groove matched with the pressure ring is provided on the air outlet plugging cone, and a sealing gasket is provided in the sealing groove.

[0024] In a possible design, an L-shaped air intake channel is provided on the air intake base, and a transverse section of the air intake channel is directly opposite to the leather cup.

[0025] In a possible design, a positioning groove is provided in the positioning ring, and an annular sealing ring is provided in the positioning groove.

[0026] In a possible design, the elastic member is configured as a disc spring, the lower end of the moving iron core is provided with an annular boss, the small diameter end of the disc spring sleeve presses against the boss, and the large diameter end presses against the valve core joint.

[0027] In a possible design, the air outlet blocking cone includes a positioning plate, a support arm and a bottom plate, the support arm is provided in plurality, and both ends of the support arm are fixedly connected to the positioning plate and the bottom plate respectively;

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

[0029] Compared with the traditional valve control structure that includes multiple independent components such as piston valve, cylinder, travel switch, etc., the pneumatic two-way piston valve integrates related functions into an integrated design. The valve body, valve core, magnetic isolation tube and other components cooperate with each other, reducing the number of independent accessories, effectively reducing the overall volume, simplifying the gas circuit layout, avoiding complex gas circuit 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 the hidden dangers of failure caused by complex structure.

[0030] The coordination of the components in the piston valve avoids the problem of slow response speed caused by the traditional cylinder relying solely on gas compression drive. The coordination of electromagnetic drive and air pressure makes the valve opening and closing action response faster; on the other hand, its special structural design optimizes the force between the valve core and the packing, reduces the static friction resistance that the valve core needs to overcome at the initial opening and closing, reduces the additional power consumption, further shortens the valve action time, and can achieve rapid opening and closing of the valve, meeting the working conditions with high requirements for valve action speed.

[0031] The above technical solution has changed the traditional cylinder's reliance on sealing rings to achieve piston sealing. The reasonable coordination of the leather cup, positioning ring, spring and other components and the unique sealing structure design between the valve core and the valve body have reduced the adverse effects of sliding friction, temperature changes and other factors on sealing performance. In the long-term operation process, it can effectively maintain good sealing performance, avoid problems such as reduced cylinder drive efficiency and valve action speed fluctuations caused by sealing failure, improve the control stability of the entire valve control structure, and extend the service life.

[0032] The structure and working mode of the piston valve effectively avoid the nonlinear jump phenomenon caused by the switching between static friction and sliding friction when the traditional valve is equipped with a positioner. During the valve opening adjustment process, the displacement of the valve core can respond to the control signal of the positioner more smoothly and accurately, and there will be no sudden displacement and continuous vibration of the valve core due to changes in friction near the target opening, which significantly improves the control accuracy of the positioner on the valve opening, reduces the wear of mechanical parts caused by frequent correction actions, and further ensures the long-term stable and accurate operation of the valve control structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the air-controlled two-way piston valve provided by the present invention in one embodiment;

[0035] Figure 2 is a schematic cross-sectional structural diagram of an air-controlled two-way piston valve provided by the present invention in one embodiment;

[0036] Figure 3 It is a schematic cross-sectional structural diagram of the air-controlled two-way piston valve provided by the present invention in a closed state;

[0037] Figure 4 is a schematic cross-sectional view of the pneumatically controlled two-way piston valve provided by the present invention in a closed state. Figure 4 and Figure 3 The cross-sectional directions are different;

[0038] Figure 5 is a schematic cross-sectional view of the pneumatically controlled two-way piston valve provided by the present invention in a closed state. Figure 5 Relative to Figure 3 , Figure 4 The cross-sectional directions are different;

[0039] Figure 6 It is a schematic cross-sectional structural diagram of the air-controlled two-way piston valve provided by the present invention in a ventilated state;

[0040] Figure 7 is a schematic cross-sectional view of the gas-controlled two-way piston valve provided by the present invention in a ventilated state. Figure 7 and Figure 6 The cross-sectional directions are different;

[0041] Figure 8 is a schematic cross-sectional view of the gas-controlled two-way piston valve provided by the present invention in a ventilated state. Figure 8 Relative to Figure 6 , Figure 7 The cross-sectional directions are different.

[0042] In the above drawings: 1-valve body, 101-air source inlet, 102-breathing port, 103-air outlet, 11-air inlet base, 1101-air inlet channel, 12-air outlet blocking cone, 120-air outlet channel, 121-positioning plate, 122-support arm, 123-bottom plate, 2-valve core, 21-positioning ring, 31-magnetic isolation tube, 32-valve core joint, 33-static iron core, 331-exhaust hole, 332-second ridge, 34-moving iron core, 341-first ridge, 342-boss, 301-air gap, 41-leather cup, 42-pressure ring, 43-limiting ring, 400-inflating chamber, 5-spring, 6-sealing block. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that although the description of these embodiments is used to help understand the present invention, it does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0044] According to a specific embodiment of the present invention, a gas-controlled two-way piston valve is provided, wherein: Figures 1 to 8 A specific embodiment of the gas-controlled two-way piston valve is shown.

[0045] See also Figures 1 to 8As shown, the pneumatically controlled two-way piston valve comprises: a valve body 1, which is provided with a cavity whose axis is parallel to the first direction, and an air inlet base 11 and an air outlet plugging cone 12 are respectively provided at two ends of the cavity; an air outlet channel 120 is provided on the side wall of the air outlet plugging cone 12; a valve core 2, which is formed into a hollow cylindrical structure, the valve core 2 is coaxially arranged in the cavity, and pressure rings 42 adapted to the air inlet base 11 and the air outlet plugging cone 12 are respectively provided at two ends of the valve core 2; a positioning ring 21 which is sealed against the inner wall of the valve core 2 is provided on the outer periphery of the valve core 2; a magnetic isolation tube 31, which is sealedly connected to the valve body 1 through a valve core joint 32, and a static iron core 33 and a moving iron core 34 are provided in the inner hole of the magnetic isolation tube 31, wherein the static iron core 33 is fixedly arranged at the upper end of the magnetic isolation tube 31, and the moving iron core 34 is movably arranged at the lower end of the static iron core 33; an exhaust hole 331 which is connected to the atmosphere is provided in the static iron core 33, and the moving iron core 34 is movably arranged at the lower end of the static iron core 33; the static iron core 33 is provided with an exhaust hole 331 which is connected to the atmosphere, and the moving iron core 34 is connected to the An air gap 301 is formed on the inner wall of the magnetic isolation tube 31; the lower end of the moving iron core 34 protrudes from the magnetic isolation tube 31 and the protruding end is pressed against the valve core joint 32 through an elastic member; an air source inlet, a breathing port 102 and an air outlet 103 are provided on the valve body 1, 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 static iron core 33 is located; the two ends of the breathing port 102 are respectively connected to the atmosphere and the cavity; the air outlet 103 is arranged at intervals relative to the air source inlet; the leather cup 41 is provided in two groups and is sleeved on the outer periphery of the valve core 2, wherein the inner ring of the leather cup 41 is fixedly connected to the valve core 2 by a pressure ring 42, and the outer ring of the leather cup 41 is fixedly connected to the valve body 1 by a limit ring 43; the area between the two leather cups 41 forms an inflation chamber 400; and, a spring 5 is sleeved on the outer periphery of the valve core 2, and the two ends of the spring 5 are respectively pressed against the positioning ring 21 and the limit ring 43.

[0046] It should be noted that for the directional words that appear in this article, you can refer to Figure 2 The first direction is the axial direction of the valve core, which is the X direction shown in the figure. The direction in which the moving iron core moves up and down is the second direction, which is the Z direction shown in the figure, and the second direction is perpendicular to the first direction. It should be noted that the direction will change according to the change of the overall position of the piston valve, but it does not affect the understanding of the orientation.

[0047] Among them, when the coil sleeved on the outer periphery of the magnetic isolation valve loses power, the moving iron core 34 moves down and blocks the air source inlet, and a ventilation gap is formed between the static iron core 33 and the moving iron core 34, and the air outlet 103, the air gap 301, the gap and the exhaust hole 331 are connected to the atmosphere; the external gas enters the inflation cavity 400 where the spring 5 is located from the breathing port 102 on the valve body 1. At this time, the air pressure in this area is greater than the atmospheric pressure. The valve core 2 moves toward the air outlet plug cone 12 under the action of pressure, and the pressure ring 42 on the valve core 2 is sealed against the air outlet plug 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 to make the air source inlet conductive, and the air source inlet, the air outlet 103 and the area between the positioning ring 21 and the leather cup 41 together form a high-pressure air cavity; the external gas enters the inflation cavity 400 between the positioning ring 21 and the leather cup 41 from the breathing port 102 on the valve body 1. At this time, the area is at atmospheric pressure, and the air pressure of the high-pressure air cavity is greater than the atmospheric pressure, so that the valve core 2 moves toward the air inlet base 11 under the action of pressure, the medium flow channel opens, and the piston valve is in a ventilation state.

[0049] The pneumatically controlled two-way piston valve realizes the opening and closing control of the valve based on electromagnetic drive and the displacement of the valve core 2 under the action of air pressure. The core of the valve is to utilize the air path changes caused by the interaction between the static iron core 33 and the moving iron core 34 in the magnetic isolation tube 31 when the coil is energized or de-energized, thereby affecting the air pressure environment 42 in which the valve core 2 is located, and prompting the valve core 2 to move axially relative to the valve body 1 with the cooperation of the spring 5 and other components, so as to achieve the effect of controlling the on and off of the medium flow channel.

[0050] When the coil sleeved on the outer periphery of the magnetic isolation valve is in a power-off state, the moving iron core 34 moves downward under the action of its own structure and elastic parts, and blocks the air source entrance. At this time, a gap for gas to pass through is formed between the static iron core 33 and the moving iron core 34, and the air outlet 103, the gap and the exhaust hole 331 are connected to the atmosphere. External gas enters the inflation cavity 400 where the spring 5 is located through the breathing port 102 on the valve body 1. The air pressure here is higher than the atmospheric pressure, so that the valve core 2 moves toward the air outlet plug cone 12 under the force exerted by the air pressure, and the pressure ring 42 on the valve core 2 is sealed and pressed against the air outlet plug cone 12, and the medium flow channel is closed. The valve is in a closed state to prevent the medium from passing.

[0051] When the coil is energized, the static iron core 33 and the moving iron core 34 are attracted to each other, the air source inlet is connected, and the area formed by the air source inlet, the air outlet 103, and the positioning ring 21 and the leather cup 41 becomes a high-pressure air cavity. External gas enters the air filling cavity 400 between the positioning ring 21 and the leather cup 41 from the breathing port 102 on the valve body 1. At this time, the air filling cavity 400 is at atmospheric pressure. The air pressure in the high-pressure air cavity is higher than the atmospheric pressure due to the access to the air source. Under the force generated by the air pressure difference between the high-pressure air cavity and the air filling cavity 400, the valve core 2 overcomes the resistance of the spring 5 and moves toward the air inlet base 11, so that the medium flow channel is opened, the medium can flow smoothly, and the valve is in an open state.

[0052] Compared with the traditional valve control structure including multiple independent components such as piston valve, cylinder, travel switch, etc., the pneumatically controlled two-way piston valve integrates related functions into an integrated design. The valve body 1, valve core 2, magnetic isolation tube 31 and other components cooperate with each other, reducing the number of independent accessories, effectively reducing the overall volume, simplifying the gas circuit layout, avoiding complex gas circuit 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 the hidden dangers of failure caused by complex structure.

[0053] The coordination of the components in the piston valve avoids the problem of slow response speed caused by the traditional cylinder relying solely on gas compression drive. The coordination of electromagnetic drive and air pressure makes the valve opening and closing action response faster; on the other hand, its special structural design optimizes the force between the valve core 2 and the packing, reduces the static friction resistance that the valve core 2 needs to overcome at the initial opening and closing, reduces the additional power consumption, further shortens the valve action time, and can achieve rapid opening and closing of the valve, meeting the working conditions with high requirements for valve action speed.

[0054] Through the above technical solution, the traditional cylinder relies on the sealing ring to achieve piston sealing. Through the reasonable coordination of the leather cup 41, the positioning ring 21, the spring 5 and other components and the unique sealing structure design between the valve core 2 and the valve body 1, the adverse effects of sliding friction, temperature changes and other factors on the sealing performance are reduced. In the long-term operation process, it can effectively maintain good sealing performance, avoid problems such as reduced cylinder drive efficiency and valve action speed fluctuations caused by sealing failure, improve the control stability of the entire valve control structure, and extend the service life.

[0055] The structure and working mode of the piston valve effectively avoid the nonlinear jump phenomenon caused by the switching between static friction and sliding friction when the traditional valve is equipped with a positioner. During the valve opening adjustment process, the displacement of the valve core 2 can respond to the control signal of the positioner more smoothly and accurately, and there will be no sudden displacement and continuous vibration of the valve core 2 near the target opening due to the change of friction force, which significantly improves the control accuracy of the positioner on the valve opening, reduces the wear of mechanical parts caused by frequent correction actions, and further ensures the long-term stable and accurate operation of the valve control structure.

[0056] In the present disclosure, the magnetic isolation tube is detachably connected to the valve body through a valve core joint. In this way, the magnetic isolation tube, the static iron core, the moving iron core and the elastic member (disc spring) together form a modular structure. When the magnetic isolation valve is removed, the air source air inlet air path 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 switch of the valve. When the volume of the valve becomes larger, the cavity volume of the valve core becomes larger, and the insufficient air path diameter will cause slow movement. The use of a replaceable two-position three-way valve block can change the air inlet air path diameter, allowing large-diameter valves to move faster.

[0057] The modular structure design makes the solenoid valve system more flexible and expandable. Users can easily replace or upgrade modules according to different work needs to adapt to different working conditions and requirements. For example, when a larger flow or higher pressure is required, it can be replaced with a larger caliber two-position three-way valve block without replacing the entire solenoid valve system.

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

[0059] This arrangement makes the gas source inlet more reasonable, facilitates the connection and control of the gas path, and can also optimize the overall structure of the valve body 1 to a certain extent, so that the gas source inlet is better connected with the internal gas path system, ensuring that the gas can smoothly enter the corresponding area, providing a power basis for subsequent valve actions. By setting the exhaust hole 331 in the second raised portion 332, the position of the exhaust hole 331 can be made more reasonable, which is conducive to the discharge of gas and avoids the accumulation of gas in the air gap 301 between the static iron core 33 and the moving iron core 34, thereby affecting the normal operation of the piston valve.

[0060] The use of a flexible material to make the sealing block 6 can make the sealing block 6 better adapt to the contact and movement between the moving iron core 34 and other components, and achieve a good sealing effect. The sealing blocks 6 are respectively arranged at the upper and lower ends of the moving iron core 34, which can effectively prevent gas from leaking from the gap between the moving iron core 34 and surrounding components, and ensure the sealing of the gas path system.

[0061] During the operation of the piston valve, no matter the coil is powered off or on, the sealing block 6 can fit tightly to the corresponding part to prevent problems such as abnormal valve operation or decreased control accuracy caused by gas leakage, thereby improving the working stability and reliability of the piston valve and extending its service life.

[0062] Furthermore, mounting holes are respectively provided at 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 embedding method ensures a stable connection between the sealing block 6 and the moving iron core 34, prevents the sealing block 6 from loosening or shifting due to vibration and other reasons during the operation of the piston valve, and ensures that the sealing block 6 can always effectively play its sealing role.

[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 to form 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 improve the sealing performance of the piston valve, and ensure 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 portion and the second raised portion, thereby ensuring the sealing effect.

[0065] Furthermore, the top surface of the first raised portion 341 is a plane, so that when the gas source inlet passes through the raised portion, the contact between the surrounding area and the valve body 1 and other components is more stable and flat, which is conducive to the sealing and fixation of the gas 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 a plane, so that after the exhaust hole 331 is used, its connection and cooperation with related components such as the static iron core 33 is tighter and more stable, ensuring a smooth and reliable exhaust process, and preventing gas leakage or poor exhaust around the exhaust hole 331.

[0066] The term "and / or" that may appear in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may mean: A exists alone, B exists alone, and A and B exist at the same time.

[0067] In an exemplary embodiment provided by this fair disclosure, refer to Figures 2 to 8 As shown, the exhaust hole 331 includes a large diameter section and a small diameter section connected to the large diameter section, and the small diameter section is located at one end close to the moving iron core 34. The setting of the large diameter section and the small diameter section can adjust the flow rate and flow of the gas to ensure the stability and controllability of the gas during the exhaust process. When the electromagnetic coil is energized, the static iron core 33 generates magnetic force to suck the moving iron core 34 tightly, and the exhaust sealing gasket on the moving iron core 34 presses the exhaust hole 331 of the static iron core 33 to close it, thereby controlling the flow of gas.

[0068] Specifically, the static iron core is inserted into the magnetic isolation tube with an interference fit, and the static iron core is welded to the magnetic isolation tube. In the present disclosure, the static iron core, the magnetic isolation tube, the moving iron core, etc. together constitute the main working magnetic circuit of the piston valve. The working stroke (air gap) and the surrounding of the iron core magnetic circuit are non-magnetic, so that the working magnetic flux beam passes through the iron core with less magnetic leakage, thereby improving the working efficiency and performance of the piston valve.

[0069] The double connection method of interference fit and welding makes the connection between the static iron core and the magnetic isolation tube more firm and reliable, which can effectively prevent the static iron core from loosening or shifting due to vibration or other external forces during the operation of the piston valve, ensure the stability of the internal structure of the piston valve, and help to improve the service life and reliability of the piston valve. In addition, this connection method helps to keep the inside of the piston valve clean and prevent impurities from entering the magnetic circuit and affecting the normal operation of the piston valve. At the same time, it can also prevent medium leakage and ensure the sealing performance of the piston valve.

[0070] This is conducive to ensuring that the magnetic circuit between the static iron core and the moving iron core is unobstructed. When the electromagnetic coil of the piston valve is energized or de-energized, the magnetic force can be quickly generated or eliminated, thereby quickly attracting or releasing the moving iron core, achieving rapid response of the piston valve, and improving the working efficiency of the piston valve.

[0071] In one embodiment provided by the present invention, a sealing groove matched with the pressure ring is provided on the outlet plug cone, and a sealing gasket is provided in the sealing groove. When the valve core moves toward the outlet plug cone, the end face of the valve core can press against the sealing gasket, and the sealing gasket will deform, fill and adapt to the shape of the connection surface, thereby maintaining an effective sealing effect. In addition, the sealing gasket can be used as a buffer material to reduce the stress and vibration caused by vibration and impact at the connection part, thereby absorbing and dispersing vibration and impact energy, protecting the connection part from damage, and maintaining stable sealing.

[0072] Furthermore, the end face of the valve core is configured as a smooth curved surface. In one embodiment provided in the present disclosure, the end face of the valve core is configured as a smooth curved surface. The smooth curved surface can better contact with the sealing gasket, reduce surface roughness and unevenness, thereby improving the sealing performance and preventing medium leakage. The smooth curved surface can reduce the gap between the valve core and the sealing gasket, ensuring that the sealing gasket can evenly fill these gaps when compressed to form 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 power is on and off, the valve core can move to the specified position more quickly and accurately, ensuring that the opening and closing actions of the valve are more stable and reliable.

[0073] In the present disclosure, an L-shaped air intake channel 1101 is provided on the air intake base 11, and the transverse section of the air intake channel 1101 is directly opposite to the leather cup 41. In this way, the external gas enters the interior of the piston valve along a predetermined path, thereby effectively guiding the gas flow direction, ensuring that the gas can accurately enter the area related to the leather cup 41, and providing necessary power support for subsequent valve actions. In addition, the design of the L-shaped channel can also prevent the gas from generating excessive turbulence or eddy currents during the entry process, reduce energy loss, and improve the efficiency and stability of gas flow. The cooperation between the pressure ring and the air intake base can play a limiting role, and the cooperation between the two can limit the movement range of the valve core, thereby preventing excessive movement from damaging the leather cup. In addition, such a matching structure can also prevent the valve core from tilting, thereby enabling it to move smoothly and accurately along the axial direction, thereby ensuring the sealing performance.

[0074] The transverse section of the air inlet channel 1101 is directly opposite to the leather cup 41, so that the gas can directly act on the area where the leather cup 41 is located to form a certain air pressure. When the valve is closed, the gas forms a seal at the leather cup 41 to prevent the medium from leaking. This design can make full use of the gas pressure to enhance the sealing effect, ensure that the valve has good sealing performance in the closed state, prevent the medium from leaking from the valve, and improve the reliability and safety of the piston valve.

[0075] In the present disclosure, a positioning groove is provided in the positioning ring 21, and an annular sealing ring is provided in the positioning groove, which is used to seal 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 is against the inner wall of the valve body 1, and can effectively prevent 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 air tightness or liquid tightness inside the piston valve, ensure the normal operation of the piston valve, and avoid problems such as control failure or safety hazards caused by leakage.

[0076] The sealing ring can fit tightly against the inner wall of the valve body 1 in the positioning groove, and can maintain a good sealing effect even under working conditions such as pressure changes or vibrations. The design of the positioning groove makes the sealing ring more stable during installation and operation, and is not easy to shift or deform, thereby improving the reliability and durability of the seal and extending the service life of the piston valve.

[0077] The positioning groove provides a special installation position for the sealing ring, making the installation of the sealing ring more convenient and accurate. When the sealing ring needs to be replaced, it can be operated quickly and conveniently, reducing the maintenance cost and difficulty, improving the maintainability of the piston valve, and facilitating the stable operation of the piston valve during long-term use.

[0078] By providing a positioning groove and a sealing ring in the positioning ring 21, the structural design of the piston valve can be simplified and the use of other auxiliary sealing components can be reduced. This design makes the structure of the piston valve more compact and reasonable, which is conducive to improving the performance and working efficiency of the piston valve, and also reduces the production cost.

[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. Such a design is conducive to ensuring the strength between the two and is also convenient for production and assembly.

[0080] In the present disclosure, the elastic member 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 is pressed against the boss 342, and the large diameter end is pressed against the valve core joint 32. The disc spring, as an elastic element, can provide elastic force between the moving iron core 34 and the valve core joint 32. When the piston valve is working, the elastic force of the disc spring can ensure the close contact between the moving iron core 34 and the valve core joint 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, and can generate a large elastic force in a short time. When the electromagnetic coil of the piston valve is energized or de-energized, the disc spring can quickly push the moving iron core 34 toward or pull it away from the valve core joint 32, so as to achieve a rapid response of the piston valve and improve the working efficiency of the piston valve. 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, which can better adapt to the disc spring, thereby reducing the displacement / vibration of the moving iron core during movement, which is beneficial for 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 can provide positioning and support for the disc spring. The small diameter end of the disc spring presses against the boss 342, which can ensure that the disc spring maintains a stable position during operation, prevents the disc spring from deflecting or falling off, and thus ensures 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 the assembly process, the disc spring can be directly sleeved on the boss 342, and then the moving iron core 34 can be installed on the valve core connector 32 without the need for additional positioning devices or tools. This not only improves the assembly efficiency, but also reduces the assembly cost. At the same time, during the maintenance process, the boss 342 also facilitates the removal and replacement of the disc spring, improving the maintainability of the piston valve.

[0084] In an embodiment provided in the present disclosure, the air outlet plugging cone 12 includes a positioning plate 121, a support arm 122 and a bottom plate 123. The support arm 122 is provided in plurality, and its two ends are respectively fixedly connected to the positioning plate 121 and the bottom plate 123; the positioning plate 121 is fixedly connected to the valve core 2, and the bottom plate 123 is arranged facing the valve core 2.

[0085] When the valve is closed, the valve core 2 moves and contacts the bottom plate 123 of the outlet plug cone 12, and the medium flow channel is closed by the blocking effect of the bottom plate 123 on the valve core 2. The positioning plate 121 is fixedly connected to the valve core 2 to ensure the relative position between the outlet plug cone 12 and the valve core 2 is accurate, and the support arm 122 plays the role of connecting and supporting the positioning plate 121 and the bottom plate 123 to ensure the overall structural stability of the outlet plug cone 12.

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

[0087] Based on the structural design that the air outlet plugging cone 12 has multiple support arms 122 evenly distributed in the circumferential direction, the force can be evenly distributed, avoiding deformation or damage of the air outlet plugging cone 12 due to excessive local force, thereby ensuring that the valve can reliably withstand the medium pressure in the closed state, thereby 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 positioning plate 121 and the bottom plate 123 by the support arm 122, make the assembly between the outlet plug cone 12 and the valve core 2 more precise and firm. This structural design helps to improve the assembly accuracy of the valve, reduce problems such as poor valve sealing caused by assembly errors, enhance the reliability and stability of the valve, and ensure that the valve can work normally under various working conditions. The structure is relatively simple, easy to process and manufacture, and reduces production costs. At the same time, when the valve needs to be maintained or parts need to be replaced, this structure is also easy to disassemble and inspect, which is conducive to timely discovery and handling of problems, improving the maintainability of the valve, and reducing downtime and maintenance costs.

[0089] Finally, it should be noted that the present invention is not limited to the above optional implementations, and anyone can derive other various forms of products under the enlightenment of the present invention. The above specific implementations should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in 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 is provided with a cavity whose axis is parallel to the first direction, and an air inlet base and an air outlet plugging cone are respectively provided at two ends of the cavity; and an air outlet channel is provided on the side wall of the air outlet plugging cone; The valve core is formed into a hollow cylindrical structure, the valve core is coaxially arranged in the cavity, and the two ends of the valve core are respectively provided with pressure rings 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 isolation tube is sealed and connected to the valve body through a valve core joint, and a static iron core and a moving iron core are provided in the inner hole of the magnetic isolation tube, wherein the static iron core is fixedly arranged at the upper end of the magnetic isolation tube, and the moving iron core is movably arranged at the lower end of the static iron core; an exhaust hole connected to the atmosphere is provided in the static iron core, and an air gap is formed between the moving iron core and the inner wall of the magnetic isolation tube; the lower end of the moving iron core protrudes from the magnetic isolation tube and the protruding end is pressed against the valve core joint through an elastic member; an air source inlet, a breathing port and an air outlet are provided on the valve body, 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 static iron core is located; the two ends of the breathing port are respectively connected to the atmosphere and the cavity; the air outlet is spaced relative to the air source inlet; The leather cups are provided in two groups and are sleeved on the outer periphery of the valve core, wherein the inner ring of the leather cups is fixedly connected to the valve core via a pressure ring, and the outer ring of the leather cups is fixedly connected to the valve body via a limit ring; the area between the two leather cups forms an air-filled cavity; and, A spring is sleeved on the outer periphery of the valve core, and two ends of the spring are respectively pressed against the positioning ring and the limiting ring.

2. The gas-controlled two-way piston valve according to claim 1, characterized in that: A first raised portion is provided on the surface of the valve body below the moving iron core, the top surface of the first raised portion is a plane, and the gas source inlet passes through the first raised portion; And / or, a second raised portion is provided on the bottom surface of the static iron core, and the exhaust hole penetrates through the second raised portion; The upper end and the lower end of the moving iron core are respectively provided with sealing blocks made of flexible material.

3. The gas-controlled two-way piston valve according to claim 2, characterized in that: Both ends of the moving iron core are respectively provided with mounting holes, and the sealing block is sealed and embedded in each mounting hole.

4. The gas-controlled two-way piston valve according to claim 1, characterized in that: The exhaust hole comprises a large diameter section and a small diameter section connected to the large diameter section, and the small diameter section is located at one end close to the moving iron core.

5. The gas-controlled two-way piston valve according to claim 1, characterized in that: The static iron core is inserted into the magnetic isolation tube with interference fit, and the static iron core is welded to the magnetic isolation tube.

6. The gas-controlled two-way piston valve according to claim 1, characterized in that: The air outlet plugging cone is provided with a sealing groove matched with the pressure ring, and a sealing gasket is provided in the sealing groove.

7. The air-controlled two-way piston valve according to claim 1, characterized in that: An L-shaped air intake channel is provided on the air intake base, and a transverse section of the air intake channel is directly opposite to the leather cup.

8. The gas-controlled two-way piston valve according to claim 1, characterized in that: A positioning groove is arranged in the positioning ring, and an annular sealing ring is arranged in the positioning groove.

9. The gas-controlled two-way piston valve according to claim 1, characterized in that: The elastic member is configured as a disc spring, and an annular boss is provided at the lower end of the moving iron core. The small diameter end of the disc spring sleeve presses against the boss, and the large diameter end presses against the valve core joint.

10. The gas-controlled two-way piston valve according to claim 1, characterized in that: The air outlet blocking cone comprises a positioning plate, a support arm and a bottom plate, wherein the support arm is provided in plurality, and both ends of the support arm are respectively fixedly connected to the positioning plate and the bottom plate; The positioning plate is fixedly connected to the valve core, and the bottom plate is arranged facing the valve core.

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