High-pressure pneumatic valve and fluid control system

Abstract

The present application relates to the technical field of gas valves, and discloses a high-pressure pneumatic valve and a fluid control system. The high-pressure pneumatic valve (100) comprises: a valve body assembly (1), a valve seat assembly (5), and a valve rod body (3) used for blocking a gas flow channel (511) in the valve seat assembly (5), wherein the valve rod body (3) penetrates through the valve body assembly (1) and the valve seat assembly (5); the valve seat assembly (5) comprises a valve seat body (51) having the gas flow channel (511) and a blocking slope surface, and a blocking sealing ring (52) located at the cut-off position of the gas flow channel (511); the blocking sealing ring (52) is provided with a blocking inclined surface (521) fitted with the valve rod body (3) to block the gas flow channel (511); the blocking sealing ring (52) is embedded and fixed into the blocking slope surface of the valve seat body (51), and the blocking inclined surface (521) of the blocking sealing ring (52) protrudes outwards beyond the blocking slope surface; the blocking sealing ring (52) is made of an elastic non-metal material.

Description

A high-pressure pneumatic valve and fluid control system Technical Field

[0001] The present invention relates to the technical field of pneumatic valves, and in particular to a high-pressure pneumatic valve and a fluid control system. Background Art

[0002] Pneumatic stop valve is a pneumatic actuator commonly used under fluid working conditions. It uses compressed air as the power source of the valve. It has the characteristics of simple structure, convenient maintenance, good sealing, low friction between sealing surfaces, and long service life. It is a commonly used valve in fluid control.

[0003] Patent number: 202211446669.4, patent name: A pneumatic high-pressure valve discloses a technical solution for automatically controlling high-pressure gas. In the disclosed technical solution, due to the unreasonable structural layout design, it can only cut off the high-pressure gas of about 40Mpa, and is difficult to adapt to the flow switch control of gas of 72Mpa and above, and is difficult to adapt to some occasions with special requirements for sealing performance. The sealing structure can achieve a helium leakage rate of 1×10 -6 mbar / L / Min. Under high-intensity gas pressure, the operation is not stable enough and it is difficult to meet the requirements of various performance indicators such as sealing and service life.

[0004] Based on the above background, the inventors have designed a high-pressure pneumatic valve and fluid control system that can solve one or more of the above problems, and therefore, the present application is hereby filed.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to provide a high-pressure pneumatic valve and a fluid control system, which are used to solve the problems that the high-pressure pneumatic valves in the current gas automatic control system cannot be used for air pressures above 72Mpa and have insufficient sealing performance.

[0007] In order to solve the above technical problems, one aspect of the present invention provides a high-pressure pneumatic valve, including a valve body assembly and a valve seat assembly, and a valve stem body for blocking the gas flow channel in the valve seat assembly, the valve stem body passes through the valve body assembly and the valve seat assembly and can move repeatedly along its axis; the valve seat assembly includes: a valve seat body having a gas flow channel and a blocking slope, and a blocking sealing ring located at the gas flow channel cutoff, the blocking sealing ring having a blocking slope that cooperates with the valve stem body to block the gas flow channel, the blocking sealing ring is embedded and fixed in the blocking slope of the valve seat body, and the blocking slope of the blocking sealing ring protrudes outward from the blocking slope; the blocking sealing ring is made of an elastic non-metallic material.

[0008] The design concept of the present invention is: by embedding a fixed non-metallic sealing ring in the sealing slope of the valve seat body, the gas flow channel of the valve seat body is sealed by using the non-metallic material with a certain elasticity of the sealing ring and the valve stem body. Compared with the two metal surface seals of the original valve stem body and the valve seat body, it is replaced by a sealing seal between the metal surface and the elastic non-metallic surface. During the sealing process, the sealing slope of the sealing ring can be driven to produce a certain elastic deformation, thereby improving the sealing effect and solving the problem that the current high-pressure pneumatic valve cannot be used for air pressures above 72Mpa and the sealing performance is insufficient.

[0009] Under the technical route of the design concept of the present invention, some preferred solutions are as follows:

[0010] In one embodiment, it also includes: a valve cover assembly and a number of mounting bolts for locking the valve cover assembly, the valve body assembly and the valve seat assembly into one, the mounting bolts are distributed along the circumference of the valve stem body and are arranged parallel to the valve stem body; the valve body assembly includes a first valve body and a second valve body, and the valve seat assembly is located between the first valve body and the second valve body; the valve seat assembly includes a first valve cover and a second valve cover, and the first valve cover and the second valve cover are respectively located on both sides of the first valve body and the second valve body; the first valve cover, the first valve body, the second valve body, and the second valve cover are distributed in layers in sequence, and the valve stem body passes through the first valve cover, the first valve body, the valve seat assembly, the second valve body and the second valve cover; a number of mounting bolts pass through the first valve cover, the first valve body, the second valve body, and the second valve cover in sequence and lock the valve cover assembly between the first valve body and the second valve body.

[0011] In one embodiment, a sliding bushing assembly for supporting the valve stem body is further included, and the sliding bushing assembly includes: a first sliding bushing located between the first valve body and the first valve cover, and a second sliding bushing located between the second valve body and the second valve cover, and the valve stem body is slidingly connected to the first sliding bushing and the second sliding bushing along its axial direction; the first sliding bushing and the second sliding bushing both include a non-metallic bearing that is sleeved on the valve stem body and slidably connected thereto, and a bearing seat for mounting the non-metallic bearing.

[0012] In one embodiment, it also includes a high-pressure sealing ring assembly that is sleeved on the valve stem body and slidably connected thereto, and the high-pressure sealing ring assembly includes: a first high-pressure sealing ring located between the first valve body and the first valve cover, and a second high-pressure sealing ring located between the second valve body and the second valve cover; the first high-pressure sealing ring, the sealing ring and the second high-pressure sealing ring distributed in sequence constitute a three-layer sealing structure for the valve stem body; the non-metallic bearings of the first sliding bushing and the second sliding bushing, and the sealing ring are all made of a pressure-resistant material formed of polyimide and graphite; the first high-pressure sealing ring and the second high-pressure sealing ring are both made of polyurethane material.

[0013] In one embodiment, the first valve body is provided with a plurality of air inlets radially arranged along the valve stem body, and the second valve body is provided with a plurality of air outlets radially arranged along the valve stem body; the air inlets and the air outlets are connected through the gas flow channel of the valve seat assembly.

[0014] In one embodiment, the air inlet includes a first air inlet and a second air inlet relatively arranged on the first valve body, and an air inlet buffer chamber is provided between the first air inlet and the second air inlet; the air outlet includes a first air outlet and a second air outlet relatively arranged on the second valve body, and an air outlet buffer chamber is provided between the first air outlet and the second air outlet; the air inlet buffer chamber and the air outlet buffer chamber are respectively located on both sides of the valve seat assembly and are connected to the gas flow channel of the valve seat assembly.

[0015] In one embodiment, the air inlet buffer cavity and the air outlet buffer cavity are both cylindrical structures; an air inlet gentle slope surface is provided between the air inlet buffer cavity and the gas flow channel of the valve seat assembly; and an air outlet gentle slope surface is provided between the air outlet buffer cavity and the gas flow channel of the valve seat assembly.

[0016] In one embodiment, the sealing ring needs to be rolled after being embedded and fixed on the valve seat body; a sealing step for installing the sealing gasket and the valve seat sealing ring is provided on the valve seat body; and it also includes a dust ring assembly that is sleeved on the valve stem body and embedded on the valve cover assembly; the dust ring assembly includes a first dust ring embedded in the first valve cover and a second dust ring embedded on the second valve cover.

[0017] In one embodiment, the valve stem body includes a first connecting structure, a first sliding section, a connecting section, a sealing section, a limiting section, a second sliding section and a second connecting structure that are integrally formed and distributed in sequence; the sealing section has a sealing cone surface that is adapted to the shape of the sealing slope of the sealing sealing ring; the shapes of the sealing slope and the sealing cone surface are both conical; and several layers of circular ring-shaped sealing protrusions are also provided on the sealing slope of the sealing sealing ring.

[0018] Another aspect of the present invention provides: a fluid control system, comprising a high-pressure pneumatic valve as described above, and also comprising a driving cylinder for driving the valve stem body away from the valve seat assembly along its axial direction, and a reset cylinder for driving the valve stem body to reset and block the gas flow channel; the reset cylinder and the driving cylinder are respectively detachably connected to the two ends of the valve stem body.

[0019] Beneficial effects of the present invention:

[0020] One advantage of the present invention is that a fixed non-metallic sealing ring is embedded in the sealing slope of the valve seat body, and the gas flow channel of the valve seat body is sealed by using the non-metallic material of the sealing ring with a certain elasticity and the valve stem body. Compared with the two metal surface seals of the original valve stem body and the valve seat body, a sealing seal between the metal surface and the elastic non-metallic surface is replaced. During the sealing process, the sealing slope of the sealing ring can be driven to produce a certain elastic deformation, thereby improving the sealing effect and solving the problem that the current high-pressure pneumatic valve cannot be used for air pressures above 72Mpa and the sealing performance is insufficient.

[0021] Another advantage of the present invention is that the components of the entire valve body are re-designed to form a layered structure design in which the first valve cover, the first sliding bushing, the first valve body, the valve seat, the second valve body, the second sliding bushing, and the second valve cover are distributed in sequence, and the valve stem body is designed to pass through the above components in sequence, so that the force of the present invention is more stable, and during actual use, the valve stem has multiple fulcrums, runs more smoothly, has better sealing performance, and has a longer service life; in addition, on the basis of the above-mentioned layered structure design and through-structure design, the three-layer sealing structure formed by the first high-pressure sealing ring, the blocking sealing ring and the second high-pressure sealing ring, and the pressure-resistant materials used at the special sealing positions of the three-layer sealing structure can further improve the sealing performance during the opening and closing and operation of the valve.

[0022] The present invention, based on the layered structure design and the through structure design, provides multiple air inlets and outlets on the first valve body and the second valve body, which can quickly control the multi-path gas flow channels and flexibly adjust the multi-path gas flow channels when several air inlets and outlets are blocked or opened, forming the effects of single inlet and single outlet, single inlet and multiple outlets, multiple inlets and single outlet or multiple inlets and multiple outlets, so that a single valve can achieve single-path or multi-path control of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of the three-dimensional structure of Example 1 of the present invention;

[0024] FIG2 is a schematic cross-sectional view of Example 1 of the present invention;

[0025] FIG3 is a schematic diagram of the front view of the valve stem in Example 1 of the present invention;

[0026] FIG4 is a schematic cross-sectional view of the valve seat assembly in Example 1 of the present invention;

[0027] FIG5 is a schematic cross-sectional view of the structure of embodiment 2 of the present invention.

[0028] Explanation of reference numerals: 100 - high-pressure pneumatic valve; 200 - fluid control system; 1 - valve body assembly, 11 - first valve body, 111 - first air inlet, 112 - second air inlet, 113 - air inlet buffer chamber, 114 - air inlet gentle slope, 12 - second valve body, 121 - first air outlet, 122 - second air outlet, 123 - air outlet buffer chamber, 124 - air outlet gentle slope, 2 - valve cover assembly, 21 - first valve cover, 22 - second valve cover, 3 - valve stem body, 31 - first sliding section, 32 - second sliding section, 33 - connecting section, 34 - blocking section, 341 - blocking cone, 35 -Limiting section, 36-first connecting structure, 37-second connecting structure, 4-mounting bolt, 5-valve seat assembly, 51-valve seat body, 511-gas flow channel, 512-sealing step, 52-sealing sealing ring, 521-sealing slope, 522-sealing protrusion, 53-valve seat sealing ring, 61-first sliding bushing, 62-second sliding bushing, 71-first high-pressure sealing ring, 72-second high-pressure sealing ring, 81-first dust ring, 82-second dust ring, 91-driving cylinder, 92-reset cylinder. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0031] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "having," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] Example 1:

[0034] As shown in Figures 1 to 4, this embodiment provides a high-pressure pneumatic valve 100, including: a valve body assembly 1 and a valve seat assembly 5, and a valve stem body 3 for blocking the gas flow channel 511 in the valve seat assembly 5, the valve stem body 3 is arranged to pass through the valve body assembly 1 and the valve seat assembly 5 and can move repeatedly along its axis; the valve seat assembly 5 includes: a valve seat body 51 having a gas flow channel 511 and a blocking slope, and a blocking sealing ring 52 located at the cutoff of the gas flow channel 511, the blocking sealing ring 52 has a blocking slope 521 that cooperates with the valve stem body 3 to block the gas flow channel 511, the blocking sealing ring 52 is embedded and fixed in the blocking slope of the valve seat body 51, and the blocking slope 521 of the blocking sealing ring 52 protrudes outward from the blocking slope; the blocking sealing ring 52 is made of an elastic non-metallic material.

[0035] The design concept of the present invention is: by embedding a fixed non-metallic sealing ring in the sealing slope of the valve seat body 51, the gas flow channel 511 of the valve seat body 51 is sealed by using the non-metallic material of the sealing ring 52 with a certain elasticity and the valve stem body 3. Compared with the two metal surface seals of the original valve stem body 3 and the valve seat body 51, it is replaced by a sealing seal between the metal surface and the elastic non-metallic surface. During the sealing process, the sealing slope 521 of the sealing ring 52 can be driven to produce a certain elastic deformation, thereby improving the sealing effect and solving the problem that the current high-pressure pneumatic valve cannot be used for air pressures above 72Mpa and the sealing performance is insufficient.

[0036] Under the technical route of the design concept of the present invention, some preferred solutions are as follows:

[0037] In some preferred embodiments, the valve cover assembly 2 and a plurality of mounting bolts 4 for locking the valve cover assembly 2, the valve body assembly 1 and the valve seat assembly 5 into one body, the mounting bolts 4 are distributed circumferentially along the valve stem body 3 and are arranged parallel to the valve stem body 3; the valve body assembly 1 includes a first valve body 11 and a second valve body 12, the valve seat assembly 5 is located between the first valve body 11 and the second valve body 12, and is covered in the valve cavity formed by the first valve body 11 and the second valve body 12; the valve cover assembly 2 includes a first valve cover 21 and a second valve cover 22, the first valve cover 21 and the second valve cover 22 are respectively located in the first valve body 11 and the second valve body 12. On both sides of the valve body 11 and the second valve body 12; as shown in Figure 1, the first valve cover 21, the first valve body 11, the second valve body 12, and the second valve cover 22 are distributed in layers in sequence, and the valve stem body 3 passes through the first valve cover 21, the first valve body 11, the valve seat assembly 5, the second valve body 12, and the second valve cover 22 in sequence; a number of mounting bolts 4 pass through the first valve cover 21, the first valve body 11, the second valve body 12, and the second valve cover 22 in sequence, locking the valve cover assembly 2 on the first valve body 11 and the second valve body 12. At the same time, the valve seat assembly 5 is also locked between the first valve body 11 and the second valve body 12.

[0038] As shown in Figure 2, the valve body assembly 1 in this embodiment includes a first valve body 11 and a second valve body 12, and the valve cover assembly 2 includes a first valve cover 21 and a second valve cover 22, which are locked and fixed by installing bolts 4, which not only makes the overall layout of the valve body reasonable, but also makes it easy to disassemble and assemble the components of the valve body, facilitate the replacement of gaskets, sealing rings and other components, and facilitate maintenance; at the same time, the valve seat assembly 5 is covered in the recess of the first valve body 11 and the second valve body 12, and can maintain a stable position during the movement of the valve stem body 3 along its axis, ensuring the stability of the valve body sealing performance.

[0039] In this embodiment, the number of mounting bolts 4 is four, and the four mounting bolts 4 are evenly distributed along the circumference of the valve stem body 3. As shown in Figure 1, the first valve body 11 and the second valve body 12 in this embodiment are both cubic structures, and the four mounting bolts 4 are arranged at the four corners of the valve body assembly 1. In some embodiments, the valve body assembly 1 can also be cylindrical or other shapes, which will not be repeated here.

[0040] In some preferred embodiments, as shown in FIG2 , a sliding bushing assembly for supporting the valve stem body 3 is further included. The sliding bushing assembly includes: a first sliding bushing 61 located between the first valve body 11 and the first valve cover 21, and a second sliding bushing 62 located between the second valve body 12 and the second valve cover 22. The valve stem body 3 is slidably connected to the first sliding bushing 61 and the second sliding bushing 62 along its axial direction. The first sliding bushing 61 and the second sliding bushing 62 each include a non-metallic bearing that is sleeved on the valve stem body 3 and slidably connected thereto, and a bearing seat for mounting the non-metallic bearing. By providing the first sliding bushing 61 and the second sliding bushing 62, the valve stem body 3 can be supported by the first sliding bushing 61 and the second sliding bushing 62 at the same time, so that during the reciprocating sliding of the valve stem body 3 along its axis, the valve stem body 3 has better coaxiality, fits more closely with the valve seat body 51 of the valve seat assembly 5, operates more smoothly, has better sealing performance, and has a longer service life.

[0041] In some preferred embodiments, it also includes a high-pressure sealing ring assembly that is sleeved on the valve stem body 3 and slidably connected thereto, and the high-pressure sealing ring assembly includes: a first high-pressure sealing ring 71 located between the first valve body 11 and the first valve cover 21, and a second high-pressure sealing ring 72 located between the second valve body 12 and the second valve cover 22; the first high-pressure sealing ring 71, the sealing ring 52 and the second high-pressure sealing ring 72 distributed in sequence constitute a three-layer sealing structure for the valve stem body 3; the non-metallic bearings of the first sliding bushing 61 and the second sliding bushing 62, and the sealing ring 52 are all made of a pressure-resistant material formed of polyimide and graphite; the first high-pressure sealing ring 71 and the second high-pressure sealing ring 72 are both made of polyurethane material, the pressure-resistant material formed of polyimide and graphite is an existing material, and the polyurethane material is also an existing material, which will not be repeated here. Based on the layered structure design and the through-type structure design, this embodiment uses a three-layer sealing structure formed by the first high-pressure sealing ring 71, the blocking sealing ring 52 and the second high-pressure sealing ring 72, and the pressure-resistant materials used at the special sealing positions of the three-layer sealing structure, which can further improve the sealing performance during the opening and closing and operation of the valve.

[0042] In some preferred embodiments, the first valve body 11 is provided with a plurality of air inlets radially arranged along the valve stem body 3, and the second valve body 12 is provided with a plurality of air outlets radially arranged along the valve stem body 3; the air inlets and air outlets are connected through the gas flow channel 511 of the valve seat assembly 5. Providing multiple air inlets and air outlets can control the flow of multiple gases.

[0043] Specifically, in this embodiment, as shown in Figure 2, the air inlet includes a first air inlet 111 and a second air inlet 112 relatively arranged on the first valve body 11, and an air inlet buffer chamber 113 is arranged between the first air inlet 111 and the second air inlet 112; the air outlet includes a first air outlet 121 and a second air outlet 122 relatively arranged on the second valve body 12, and an air outlet buffer chamber 123 is arranged between the first air outlet 121 and the second air outlet 122; the air inlet buffer chamber 113 and the air outlet buffer chamber 123 are respectively located on both sides of the valve seat assembly 5 and are connected to the gas flow channel 511 of the valve seat assembly 5. Multiple air inlets and outlets are provided on the first valve body 11 and the second valve body 12, which can quickly control the multiple gas flow channels 511 and flexibly adjust the flow of multiple gases when several air inlets and outlets are blocked or opened, forming a single inlet and single outlet, single inlet and multiple outlets, multiple inlets and single outlets or multiple inlets and multiple outlets, so that a single valve can achieve single-channel or multi-channel control of gas.

[0044] It is understandable that, in actual use, if the second air inlet 112 and the second air outlet 122 are directly blocked, the valve in this embodiment can control the gas in and out of the first air inlet 111 and the first air outlet 121, forming a single-inlet, single-outlet air path control. If only the second air outlet 122 is blocked, a dual-inlet, single-outlet air path control can be formed. If only the second air inlet 112 is blocked, a single-inlet, dual-outlet air path control can be formed. If the air inlet of the first valve body 11 and the air outlet on the second valve body 12 are not blocked, a dual-inlet, dual-outlet air path control can be formed. In some embodiments, more air inlets can be opened on the first valve body 11 and more air outlets can be opened on the second valve body 12, which will not be described in detail here.

[0045] In some preferred embodiments, the air inlet buffer chamber 113 and the air outlet buffer chamber 123 are both cylindrical structures; an air inlet gentle slope 114 is provided between the air inlet buffer chamber 113 and the gas flow channel 511 of the valve seat assembly 5; and an air outlet gentle slope 124 is provided between the air outlet buffer chamber 123 and the gas flow channel 511 of the valve seat assembly 5. In this embodiment, by providing the cylindrical air inlet buffer chamber 113 and the air outlet buffer chamber 123, buffering can be performed after the high-pressure gas enters, and the designed air inlet gentle slope 114 and the air outlet gentle slope 124 can further smooth and slow down the high-pressure gas when it flows into or out of the gas flow channel 511 of the valve seat body 51, avoiding rapid changes in internal pressure and ensuring valve performance and life. In this embodiment, the air inlet gentle slope 114 and the air outlet gentle slope 124 are both in the shape of a conical slope with a gradually expanding or shrinking cross-section.

[0046] In some preferred embodiments, as shown in Figure 2, the sealing ring 52 needs to be rolled after being embedded and fixed on the valve seat body 51; a sealing step 512 for installing a sealing gasket and a valve seat sealing ring 53 is provided on the valve seat body 51; and it also includes a dust ring assembly that is sleeved on the valve stem body 3 and embedded on the valve cover assembly 2; the dust ring assembly includes a first dust ring 81 embedded in the first valve cover 21 and a second dust ring 82 embedded on the second valve cover 22. By providing the first dustproof ring 81 and the second dustproof ring 82, dust in the external air can be prevented from entering the interior of the valve body and affecting the performance and life. As shown in Figures 2 and 4, the sealing step 512 provided in this embodiment can be fitted with a sealing gasket and a valve seat sealing ring 53. After the first valve body 11 and the second valve body 12 are locked and fixed by the mounting bolts 4, gas is prevented from leaking from the gap between the first valve body 11 and the second valve body 12. Since the valve seat sealing ring 53 does not cause relative sliding between the first valve body 11, the second valve body 12 and the valve seat body 51 after the valve is installed, its material can be conventional polytetrafluoroethylene.

[0047] In some preferred embodiments, as shown in FIG3 , the valve stem body 3 includes an integrally formed first connecting structure 36, a first sliding section 31, a connecting section 33, a blocking section 34, a limiting section 35, a second sliding section 32, and a second connecting structure 37 that are sequentially distributed. The blocking section 34 has a blocking conical surface 341 that matches the shape of the blocking inclined surface 521 of the blocking sealing ring 52. The blocking inclined surface 521 and the blocking conical surface 341 are both conical in shape. As shown in FIG4 , the blocking inclined surface 521 of the blocking sealing ring 52 is further provided with several layers of annular sealing protrusions 522. In this embodiment, the sealing protrusions 522 are provided with three layers. In applications where the application object is a high sealing requirement for precious gases or toxic and harmful gases, the sealing protrusions 522 can further improve the sealing performance of the valve. The shape of the sealing protrusions 522 can be triangular, semicircular, or the like.

[0048] In this embodiment, the diameter of the connecting section 33 is smaller than the diameter of the first sliding section 31 and the second sliding section 32, which can ensure that sufficient gas circulation space is reserved when the valve is in the open state. In addition, the first connecting structure 36 and the second connecting structure 37 in this embodiment have the same shape and can be detachably connected to the pneumatic drive structure that drives the valve stem body 3 as a whole, thereby realizing the transmission of tension or thrust, controlling the movement of the valve stem body 3, and thereby realizing the opening and closing control of the gas flow channel 511 in this embodiment.

[0049] In this embodiment, the diameter of the limiting section 35 is larger than the diameters of the first sliding section 31 and the second sliding section 32 . The limiting section 35 is located in the air outlet buffer cavity 123 between the first air outlet 121 and the second air outlet 122 .

[0050] Example 2:

[0051] As shown in Figure 5, based on the above-mentioned embodiment 1, another aspect of the present invention provides: a fluid control system 200, including a high-pressure pneumatic valve 100 as described above, and also including a driving cylinder 91 for driving the valve stem body 3 away from the valve seat assembly 5 along its axial direction, and a reset cylinder 92 for driving the valve stem body 3 to reset and block the gas flow channel 511; the reset cylinder 92 and the driving cylinder 91 are respectively detachably connected to the two ends of the valve stem body 3.

[0052] The reset cylinder 92 and the drive cylinder 91 in this embodiment are common pneumatic drive mechanisms in the prior art and will not be described in detail herein. The reset cylinder 92 in this embodiment is detachably connected to the first connection structure 36 of the valve stem body 3, and the drive cylinder 91 is detachably connected to the second connection structure 37 of the valve stem body 3. The reset cylinder 92 and the drive cylinder 91 can drive the valve stem body 3 to repeatedly move along its axial direction, thereby allowing the sealing section 34 of the valve stem body 3 to block the gas flow channel 511, or to move the sealing section 34 away from the valve seat body 51 to open the gas flow channel 511, thereby achieving on-off control of the gas flow channel 511.

[0053] The rest of the structure of this embodiment is the same as that of the above-mentioned embodiment 1 and will not be described again here.

[0054] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will be able to make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A high pressure pneumatic valve, characterized in that: include: A valve body assembly (1) and a valve seat assembly (5), and a valve stem body (3) for blocking a gas flow passage (511) in the valve seat assembly (5); the valve stem body (3) penetrates the valve body assembly (1) and the valve seat assembly (5) and can move repeatedly along the axis thereof; The valve seat assembly (5) comprises: a valve seat body (51) having a gas flow passage (511) and a blocking slope, and a blocking seal ring (52) located at the cutoff point of the gas flow passage (511), the blocking seal ring (52) having a blocking slope (521) cooperating with the valve stem body (3) to block the gas flow passage (511), the blocking seal ring (52) being embedded and fixed in the blocking slope of the valve seat body (51), and the blocking slope (521) of the blocking seal ring (52) protruding outward from the blocking slope; The blocking seal ring (52) is made of elastic non-metallic material.

2. A high pressure pneumatic valve according to claim 1, characterized in that: Also includes: A valve cover assembly (2) and a plurality of mounting bolts (4) for locking the valve cover assembly (2), the valve body assembly (1) and the valve seat assembly (5) into one body, wherein the mounting bolts (4) are distributed along the circumference of the valve stem body (3) and are arranged parallel to the valve stem body (3); The valve body assembly (1) comprises a first valve body (11) and a second valve body (12), and the valve seat assembly (5) is located between the first valve body (11) and the second valve body (12); The valve cover assembly (2) comprises a first valve cover (21) and a second valve cover (22), wherein the first valve cover (21) and the second valve cover (22) are respectively located on both sides of the first valve body (11) and the second valve body (12); The first valve cover (21), the first valve body (11), the second valve body (12), and the second valve cover (22) are sequentially arranged in layers, and the valve stem body (3) penetrates the first valve cover (21), the first valve body (11), the valve seat assembly (5), the second valve body (12), and the second valve cover (22); A plurality of mounting bolts (4) sequentially penetrate the first valve cover (21), the first valve body (11), the second valve body (12), and the second valve cover (22) and lock the valve cover assembly (2) between the first valve body (11) and the second valve body (12).

3. A high pressure pneumatic valve according to claim 2, characterized in that: Also included is a sliding bushing assembly for supporting the valve stem body (3), the sliding bushing assembly comprising: A first sliding bushing (61) is located between the first valve body (11) and the first valve cover (21), and a second sliding bushing (62) is located between the second valve body (12) and the second valve cover (22), and the valve stem body (3) is slidably connected with the first sliding bushing (61) and the second sliding bushing (62) along its axial direction; The first sliding bushing (61) and the second sliding bushing (62) both comprise a non-metallic bearing which is sleeved on the valve stem body (3) and slidably connected thereto, and a bearing seat for mounting the non-metallic bearing.

4. A high pressure pneumatic valve according to claim 3, characterized in that: The valve stem (3) further comprises a high-pressure sealing ring assembly sleeved on the valve stem body (3) and slidably connected thereto, the high-pressure sealing ring assembly comprising: a first high-pressure sealing ring (71) located between the first valve body (11) and the first valve cover (21), and a second high-pressure sealing ring (72) located between the second valve body (12) and the second valve cover (22); The first high-pressure sealing ring (71), the blocking sealing ring (52) and the second high-pressure sealing ring (72) are sequentially distributed to form a three-layer sealing structure for the valve stem body (3); The non-metallic bearings of the first sliding bushing (61) and the second sliding bushing (62), as well as the sealing ring (52) are all made of a pressure-resistant material formed by polyimide and graphite; The first high-pressure sealing ring (71) and the second high-pressure sealing ring (72) are both made of polyurethane material.

5. A high pressure pneumatic valve according to claim 2, characterized in that: The first valve body (11) is provided with a plurality of air inlets radially arranged along the valve stem body (3), and the second valve body (12) is provided with a plurality of air outlets radially arranged along the valve stem body (3); The gas inlet and the gas outlet are connected via a gas flow channel (511) of the valve seat assembly (5).

6. A high pressure pneumatic valve according to claim 5, characterized in that: The air inlet comprises a first air inlet (111) and a second air inlet (112) which are arranged on the first valve body (11) relative to each other, and an air inlet buffer chamber (113) is arranged between the first air inlet (111) and the second air inlet (112); The air outlet comprises a first air outlet (121) and a second air outlet (122) which are arranged on the second valve body (12) relative to each other, and an air outlet buffer chamber (123) is arranged between the first air outlet (121) and the second air outlet (122); The air inlet buffer chamber (113) and the air outlet buffer chamber (123) are respectively located on two sides of the valve seat assembly (5) and are in communication with the gas flow channel (511) of the valve seat assembly (5).

7. A high pressure pneumatic valve according to claim 6, characterized in that: The air inlet buffer chamber (113) and the air outlet buffer chamber (123) are both cylindrical structures; An air intake gentle slope surface (114) is provided between the air intake buffer cavity (113) and the gas flow passage (511) of the valve seat assembly (5); An air outlet gentle slope surface (124) is provided between the air outlet buffer cavity (123) and the gas flow channel (511) of the valve seat assembly (5).

8. A high pressure pneumatic valve according to claim 2, characterized in that: The blocking seal ring (52) needs to be subjected to rolling treatment after being embedded and fixed on the valve seat body (51); The valve seat body (51) is provided with a sealing step (512) for mounting a sealing gasket and a valve seat sealing ring (53); The high-pressure pneumatic valve (100) further comprises a valve cover assembly (2) which is sleeved on the valve stem body (3) and embedded in the valve cover assembly (2) The dust ring assembly on the The dustproof ring assembly comprises a first dustproof ring (81) embedded in the first valve cover (21) and a second dustproof ring (82) embedded on the second valve cover (22).

9. A high pressure pneumatic valve according to claim 1, characterized in that: The valve stem body (3) comprises a first connecting structure (36), a first sliding section (31), a connecting section (33), a blocking section (34), a limiting section (35), a second sliding section (32) and a second connecting structure (37) which are integrally formed and sequentially distributed; The blocking section (34) has a blocking conical surface (341) that matches the shape of the blocking inclined surface (521) of the blocking sealing ring (52); The blocking inclined surface (521) and the blocking conical surface (341) are both conical in shape; A plurality of layers of annular sealing protrusions (522) are also provided on the sealing inclined surface (521) of the sealing ring (52).

10. A fluid control system, comprising a high-pressure pneumatic valve (100) according to any one of claims 1 to 9, characterized in that: It also includes a driving cylinder (91) for driving the valve stem body (3) to move away from the valve seat assembly (5) along its axial direction, and a resetting cylinder (92) for driving the valve stem body (3) to re-block the gas flow passage (511); The reset cylinder (92) and the drive cylinder (91) are respectively detachably connected to the two ends of the valve stem body (3).

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