Pneumatic control valve with toughness

Abstract

The present invention discloses a pneumatic control valve with toughness, which relates to the field of valve technology and aims to solve the problem that the valve stem of the existing pneumatic control valve does not have a self-repairing function. The pneumatic control valve sets at least part of the stem section of the valve stem in the flow channel of the valve body as a tough stem section, and the tough stem section is mainly composed of a stem section body, and a first stem barrel and a second stem barrel sleeved outside the stem section body and coaxially connected by a first flexible structure. When the pneumatic control valve is working normally, the stem section body of the tough stem section is mainly used for power transmission. When the stem is severely impacted and the stem section body of the tough stem section is broken, the first stem barrel and the second stem barrel connected by the first flexible structure can replace the stem section body for power transmission to automatically restore the function of the tough stem section, thereby realizing the self-repair of the valve stem and ensuring that the pneumatic control valve can quickly resume normal operation.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a pneumatic regulating valve with toughness. Background Art

[0002] Pneumatic control valve is a valve that uses compressed gas as the power source medium, cylinder as the actuator, and is used with the help of valve positioners, gas tanks, gas filters and other accessories to achieve on-off regulation. Pneumatic control valve is mainly composed of valve and pneumatic actuator used to drive the valve; among them, pneumatic actuator is the thrust component of pneumatic control valve, which can generate corresponding thrust according to the size of control signal pressure to push the regulating component in the valve to move; the regulating component in the valve includes a movable valve core with a valve stem, which is in direct contact with the fluid and can adjust the flow.

[0003] At present, there are often liquid impurities in the natural gas used as the power source medium of the pneumatic control valve, which will affect the normal operation of the pneumatic control valve. In addition, during the control process, the valve stem and valve wall are often impacted due to the unstable flow rate and uneven flow rate of the gas in the pipeline, which seriously affects the normal operation of the valve, and even causes failures such as valve stem breakage after severe impact. The existing pneumatic control valve lacks a structure to remove liquid impurities in the power source medium, and also lacks a structure to improve the anti-fracture ability of the valve stem. The direction of its previous improvement is mainly aimed at reducing the impact of gas flow and replacing failed structures.

[0004] In terms of reducing the impact of gas flow: For example, the Chinese invention patent application with publication number CN115539699A discloses a pneumatic multi-stage step-down regulating valve, including a valve body, a sleeve movably mounted on the top of the valve body, a valve core movably connected to the top of the sleeve, a valve cover movably mounted on the top of the valve core, a gland and a bracket movably mounted on the top of the valve cover, a first bolt movably connected to the bottom of the valve cover, and a pneumatic diaphragm actuator movably mounted on the top of the bracket. Through the arrangement of the sleeve, valve cover, gland, pneumatic diaphragm actuator, bracket and valve core, it is easy to make the valve flow capacity larger, while avoiding the generation of blocked flow, reducing the damage to the inner cavity of the valve body, and being able to work stably for a long time, but this cannot effectively eliminate the impact of a large mass of natural gas flow that suddenly appears in the pipeline, and it is still easy to damage the regulating components of the valve.

[0005] In terms of replacing failed structures: For example, the Chinese invention patent application with publication number CN114776873A discloses an easily replaceable pneumatic tank bottom regulating valve, including a diaphragm actuator, a fixing mechanism and at least two driving mechanisms, the diaphragm actuator includes an upper end cover and a lower end cover, a diaphragm is arranged in the lower end cover, and the edges of the lower end cover and the diaphragm are provided with insertion holes, and each driving mechanism includes an electric motor, a movable rod and a wedge-shaped block 1, one end of the movable rod is fixedly connected to the wedge-shaped block 1, and the fixing mechanism includes a movable ring and a fixing frame, and at least two wedge-shaped blocks 2 are installed on the top of the movable ring. The use of bolts is greatly reduced by setting the driving mechanism and fixing mechanism, and the lower end cover and the diaphragm are fixed by inserting the plug into the insertion hole and using the multi-fold fixing rod to press the lower end cover and the diaphragm, so that the lower end cover and the diaphragm can be quickly disassembled, and the purpose of easy replacement of the diaphragm is achieved, but it does not take into account the replacement or self-repair of the valve stem in the valve body that is more vulnerable to damage. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a pneumatic control valve with toughness, whose valve stem has a self-repairing function, and can automatically restore its original function after the main body of a part of the stem section is broken, ensuring that the pneumatic control valve can quickly resume normal operation.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a pneumatic regulating valve with toughness, comprising a valve, wherein the valve comprises a valve body having a top opening and a flow channel, a valve cover arranged at the top opening of the valve body, and a valve stem vertically passing through the valve cover and having a portion of the stem extending into the flow channel of the valve body;

[0008] The stem section of the valve stem in the flow channel of the valve body is a first stem section, at least part of the first stem section is a tough stem section, and the tough stem section includes a stem section body, a first stem barrel and a second stem barrel;

[0009] The first rod tube is sleeved on the rod segment body and fixed relative to the upper end of the rod segment body;

[0010] The second rod tube is sleeved on the rod segment body and fixed relative to the lower end of the rod segment body;

[0011] The upper end of the second rod barrel is coaxially connected to the lower end of the first rod barrel through a first flexible structure.

[0012] Further, the upper end of the second rod barrel is nested with the lower end of the first rod barrel, one of which is an outer sleeve and the other is an inner sleeve, and the wall surfaces where the two are nested with each other are respectively a partial inner wall surface of the outer sleeve and a partial outer wall surface of the inner sleeve, the partial inner wall surface is the first wall surface, and the partial outer wall surface is the second wall surface;

[0013] The first flexible structure comprises an inner ring groove, an outer ring groove and an elastic ring;

[0014] The inner annular groove is provided on the first wall surface;

[0015] The outer annular groove is formed on the second wall surface, and its position embedded in the outer sleeve is deeper than the position of the inner annular groove in the outer sleeve;

[0016] The elastic ring is arranged in the inner annular groove and abuts against the second wall surface; or, the elastic ring is arranged in the outer annular groove and abuts against the first wall surface.

[0017] Further, the flow channel includes a main flow channel, an inlet flow channel connected to the bottom of the main flow channel, and an outlet flow channel connected to the side of the main flow channel;

[0018] The connection between the inlet flow channel and the main flow channel is a first intersection, a valve seat is provided at the first intersection, a first valve core is provided at the valve seat, and the first valve core is connected to the lower end of the first rod section; the valve rod can drive the first valve core to move up and down, so that the inlet flow channel and the main flow channel are switched between a connected state and a cut-off state;

[0019] The connection between the outlet flow channel and the main flow channel is a second intersection; a second valve core is arranged on the first rod section, and the setting height of the second valve core satisfies: when the first valve core cooperates with the valve seat, the second valve core is not higher than the lower edge of the second intersection; the valve stem can drive the second valve core to move between the lower edge and the upper edge of the second intersection to change the opening of the second intersection.

[0020] Furthermore, the tough rod section is a valve stem section between the first valve core and the second valve core, the first rod barrel is fixedly connected to the second valve core, and the second rod barrel is fixedly connected to the first valve core.

[0021] Furthermore, an ellipsoidal chamber is provided on the main channel, and the cross-sectional dimension of the ellipsoidal chamber is larger than the cross-sectional dimension of the main channel.

[0022] Furthermore, a valve stem buffer structure is provided in the valve, and the valve stem buffer structure includes a third valve core with external threads, an internal flow channel thread matching the external threads on the third valve core, and a second flexible structure;

[0023] The third valve core is arranged on the first rod section and is located on the upper side of the second valve core;

[0024] The inner thread of the flow channel is arranged on the side wall of the main flow channel and is located on the upper side of the third valve core;

[0025] The thread lead angle of the external thread on the third valve core and the internal thread of the flow channel is greater than the equivalent friction angle, and the valve stem can drive the third valve core to move up and down, so that the external thread on the third valve core and the internal thread of the flow channel switch between a mating state and a disengaging state;

[0026] The second flexible structure is arranged on the first rod section and is located on the upper side of the third valve core.

[0027] Furthermore, the second flexible structure includes a cut-off portion that divides the valve stem into an upper valve stem section and a lower valve stem section, a lower boss arranged at the bottom of the upper valve stem section, an upper boss arranged at the top of the lower valve stem section, and a spring that is sleeved on the lower boss and the upper boss and coaxially connects the upper valve stem section and the lower valve stem section.

[0028] Furthermore, the pneumatic regulating valve also includes a gas filter, and the gas filter includes a filter body, a centrifugal fan blade, a diverter cylinder and a water tank;

[0029] A filter channel is provided in the filter body, and an air outlet of the filter channel is connected to a medium inlet of the valve;

[0030] The centrifugal blade is rotatably arranged in the filter channel via a blade shaft, and the blade shaft is coaxial with the filter channel;

[0031] The diverter cylinder is arranged in the filter channel downstream of the centrifugal fan blades and is coaxial with the filter channel; the downstream end of the diverter cylinder is closedly connected to the channel wall of the filter channel, so that an annular liquid collecting groove is formed between the outer wall of the diverter cylinder and the wall surface of the filter channel, and the inner cavity of the diverter cylinder forms a clean air channel;

[0032] The water tank is arranged on the lower side of the filter body, and a liquid collecting pipe and an exhaust pipe are provided on the top, and a liquid drain pipe is provided on the side; the liquid inlet of the liquid collecting pipe is connected to the bottom of the annular liquid collecting tank, and the air outlet of the exhaust pipe is connected to the clean air channel and / or the filter channel downstream of the diversion cylinder.

[0033] Furthermore, the centrifugal fan blade comprises a fan hub rotatably arranged on the fan blade shaft, and at least 10 evenly distributed curved blades are arranged on the circumference of the fan hub.

[0034] Furthermore, the gas filter also includes a drainage control system, which includes a water level detector, a drainage solenoid valve and a drainage controller;

[0035] The water level detector is arranged in the water tank and is used to detect whether the water level in the water tank reaches a set height;

[0036] The drainage solenoid valve is arranged on the drainage pipe and is used to control the opening and closing of the drainage pipe;

[0037] The drainage controller is respectively connected to the water level detector and the drainage solenoid valve for communication, and is used to control the drainage solenoid valve to open the drainage pipe for drainage after the water level detector detects that the water level in the water tank reaches a set height.

[0038] The beneficial effects of the present invention are as follows:

[0039] (1) Since the first rod segment is the rod segment of the valve stem in the flow channel of the valve body and is the part that mainly bears the impact of the power source medium during the operation of the pneumatic control valve, improving its ability to resist fracture can improve the toughness of the valve stem. The pneumatic control valve provided by the present invention is configured such that at least part of the first rod segment is a tough rod segment, and the tough rod segment is mainly composed of a rod segment body, and a first rod barrel and a second rod barrel that are sleeved outside the rod segment body and coaxially connected by a first flexible structure. When the pneumatic control valve is operating normally, power is mainly transmitted by the rod segment body of the tough rod segment. When the valve stem is severely impacted and the rod segment body of the tough rod segment is broken, the first rod barrel and the second rod barrel connected by the first flexible structure can replace the rod segment body for power transmission, so as to automatically restore the function of the tough rod segment, thereby realizing self-repair of the valve stem and ensuring that the pneumatic control valve can quickly resume normal operation.

[0040] (2) By opening an ellipsoidal chamber with a larger cross-sectional size on the main flow channel of the valve body, the flow cross-sectional area and spatial volume of the power source medium can be increased, which can effectively reduce the speed of the power source medium flowing from the inlet flow channel into the main flow channel, thereby effectively reducing the impact of the power source medium on the regulating components in the valve during the operation of the valve.

[0041] (3) By providing a valve stem buffer structure in the valve, which is mainly composed of a third valve core with external threads, internal threads of the flow channel, and a second flexible structure, when the valve encounters a strong impact generated by the power source medium during operation, the external threads on the third valve core and the internal threads of the flow channel can cooperate to resist the impact and transfer the main impact force to the second flexible structure for buffering, thereby effectively reducing the impact of the valve stem, valve wall and each valve core, especially reducing the impact of a large group of power source medium that suddenly appears, thereby improving the service life of the valve; and, since the thread lead angle of the external threads on the third valve core and the internal threads of the flow channel is greater than the equivalent friction angle, the thread cooperation will not form self-locking, and after the impact is reduced, it can be ensured that the valve stem can drive the third valve core to move, so that the thread cooperation is released and the valve returns to a normal working state.

[0042] (4) The pneumatic regulating valve is provided with a gas filter mainly composed of a filter body, centrifugal blades, a diverter tube and a water tank. The kinetic energy of the power source medium can be used to drive the centrifugal blades to rotate, and then the rotating centrifugal blades can realize the gas-liquid stratification of the power source medium, wherein most of the gas phase flows into the valve through the clean gas channel, wherein the liquid phase and part of the gas phase will enter the annular liquid collecting groove formed between the outer wall of the diverter tube and the wall surface of the filter channel under the action of centrifugal force, and flow into the water tank through the liquid collecting pipe for collection, thereby realizing the separation of liquid impurities in the power source medium. Part of the gas phase that enters the water tank can return to the clean gas channel or the filter channel downstream of the diverter tube through the exhaust pipe, and then flow into the valve.

[0043] The technical effects brought about or directly produced by other technical features of the present invention will be described in detail in the subsequent specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0045] Figure 2 It is a side structural schematic diagram of the present invention;

[0046] Figure 3 is along Figure 2 Sectional view along line AA;

[0047] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0048] Figure 5 yes Figure 4 A partial enlarged view of point C in the middle;

[0049] Figure 6 yes Figure 5 Schematic diagram of the structure after the main body of the middle rod segment is broken;

[0050] Figure 7 yes Figure 4 A partial enlarged view of point D in the middle;

[0051] Figure 8 yes Figure 3 3D axonometric drawing;

[0052] Fig. 9 It is a schematic cross-sectional view of the gas filter of the present invention;

[0053] The markings in the figure are: 100-valve body, 111-main flow channel, 112-inlet flow channel, 113-outlet flow channel, 114-valve seat, 115-ellipsoidal chamber, 200-valve cover, 300-valve stem, 310-tough rod segment, 311-rod segment body, 312-first rod barrel, 313-second rod barrel, 314-inner ring groove, 315-outer ring groove, 316-elastic ring, 321-cut-off port, 322-lower boss, 323-upper Boss, 324-spring, 410-first valve core, 420-second valve core, 430-third valve core, 500-gas filter, 510-filter body, 511-filtration channel, 512-annular liquid collecting tank, 520-centrifugal fan blade, 521-fan blade shaft, 530-diverter cylinder, 540-water tank, 541-liquid collecting pipe, 542-exhaust pipe, 543-drain pipe, 551-water level detector, 600-pneumatic actuator. DETAILED DESCRIPTION

[0054] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The same reference numerals in the accompanying drawings represent components with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positions, and dimensional relationships based on the directions or position relationships shown in the accompanying drawings, and are only for the convenience of description, and do not indicate or imply that the referred device or component must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0056] In the description of the present invention, the term "toughness" refers to the ability of a device or component to restore its original function and purpose after failure or damage; for example, after the segment body 311 of the tough segment 310 is broken, the segment body 311 can be replaced by the first rod tube 312, the second rod tube 313 and the first flexible structure to automatically restore the function of the tough segment 310. When the term "multiple" indicates a quantity, it usually refers to a quantity of three or more, for example, "multiple" usually refers to three or more. The expression "mainly composed of..." is interpreted as also containing structural components not mentioned in the sentence. The term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The term "communication connection" refers to the communication between connected devices through the transmission interaction of signals, which can be divided into wired connection and wireless connection; wired connection is usually a connection of cables, optical fibers, etc.; wireless connection is usually a connection of radio communication, Bluetooth, infrared, NFC, etc. Furthermore, the terms “first”, “second”, and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0057] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, a pneumatic control valve with toughness includes a valve and a pneumatic actuator 600 for driving the valve;

[0058] The valve comprises a valve body 100 having a top opening and a flow channel, a valve cover 200 disposed at the top opening of the valve body 100, and a valve stem 300 vertically passing through the valve cover 200 and partially extending into the flow channel of the valve body 100; the valve stem 300 is an important component of the valve, which is usually movably disposed to transmit power for the pneumatic actuator 600 to adjust the valve opening;

[0059] The stem section of the valve stem 300 in the flow channel of the valve body 100 is the first stem section, which is the valve stem portion that mainly bears the impact of the power source medium during the operation of the pneumatic regulating valve; at least part of the first stem section is a tough stem section 310, and the tough stem section 310 includes a stem section body 311, a first stem barrel 312 and a second stem barrel 313;

[0060] The first rod barrel 312 is sleeved on the rod segment body 311 and fixed relative to the upper end of the rod segment body 311; the first rod barrel 312 can usually be directly fixedly connected to the upper end of the rod segment body 311, or can be fixedly connected to other parts in the valve fixed relative to the upper end of the rod segment body 311;

[0061] The second rod barrel 313 is sleeved on the rod segment body 311 and fixed relative to the lower end of the rod segment body 311; the second rod barrel 313 can usually be directly fixedly connected to the lower end of the rod segment body 311, or can be fixedly connected to other parts in the valve fixed relative to the lower end of the rod segment body 311;

[0062] The upper end of the second rod barrel 313 is coaxially connected to the lower end of the first rod barrel 312 through a first flexible structure; a flexible structure is a structure that can bend, twist or stretch to a certain extent without permanent damage or failure; a flexible structure is usually made of a material with elasticity and flexibility, or parts made of such materials; the first flexible structure can be of various types, such as: a flexible coupling, a flexible pipe joint, a spring connection structure, etc.; the upper end of the second rod barrel 313 is coaxially connected to the lower end of the first rod barrel 312 through the first flexible structure, which can ensure that the first rod barrel 312 and the second rod barrel 313 basically do not participate in the power transmission of the valve stem 300 when the pneumatic control valve is working normally, but mainly participate in the power transmission of the valve stem 300. The power transmission needs to be carried out by the rod segment body 311 of the tough rod segment 310; on the other hand, the first flexible structure can ensure that the first rod barrel 312 and the second rod barrel 313 are basically coaxial, allowing a certain degree of coaxiality deviation, so as to facilitate assembly and ensure that when the rod segment body 311 of the tough rod segment 310 is broken, the first rod barrel 312 and the second rod barrel 313 connected by the first flexible structure can replace the rod segment body 311 for power transmission, so as to automatically restore the function of the tough rod segment 310, thereby realizing the self-repair of the valve stem 300; on another hand, the first flexible structure can also absorb and buffer the impact on the first rod segment during the operation of the pneumatic control valve, further enhancing the ability of the valve stem 300 to resist fracture.

[0063] Combination Figure 4 , Figure 5 and Figure 6As shown, in some embodiments, the upper end of the second rod tube 313 is nested with the lower end of the first rod tube 312, one of which is an outer sleeve and the other is an inner sleeve, and the walls of the nested position of the two are respectively the local inner wall of the outer sleeve and the local outer wall of the inner sleeve, the local inner wall is the first wall, and the local outer wall is the second wall; the first flexible structure includes an inner ring groove 314, an outer ring groove 315 and an elastic ring 316; the inner ring groove 314 is opened on the first wall; the outer ring groove 315 is opened on the second wall, and its position embedded in the outer sleeve is deeper than the position of the inner ring groove 314 in the outer sleeve; the elastic ring 316 is arranged in the inner ring groove 314 and abuts against the second wall; or, the elastic ring 316 is arranged in the outer ring groove 315 and abuts against the first wall. The upper end of the second rod barrel 313 is nested with the lower end of the first rod barrel 312, which not only increases the stability of the connection between the two, but also ensures the coaxiality of the connection between the two, and facilitates the setting of the first flexible structure; the first flexible structure mainly composed of the inner ring groove 314, the outer ring groove 315 and the elastic ring 316 is not only simple in structure, easy to process and assemble, but also ensures that the first rod barrel 312 and the second rod barrel 313 hardly transmit power when the pneumatic regulating valve is working normally, and because the outer ring groove 315 is embedded in the outer sleeve at a deeper position than the inner ring groove 314 in the outer sleeve, when the rod segment body 311 is broken, the broken rod segment body 311 will drive the first rod barrel 312 and the second rod barrel 313 are relatively far apart. When the movement reaches the point where the outer ring groove 315 is exactly corresponding to the inner ring groove 314, the elastic ring 316 originally arranged in the inner ring groove 314 will release the elastic potential energy and partially embed into the outer ring groove 315, or the elastic ring 316 originally arranged in the outer ring groove 315 will release the elastic potential energy and partially embed into the inner ring groove 314, thereby fixing the first rod barrel 312 and the second rod barrel 313 axially and radially. The connection is stable, the coaxiality is high and has a certain buffering capacity, thereby ensuring that the second rod barrel 313 and the first rod barrel 312 can replace the rod segment main body 311 for power transmission, so as to automatically restore the function of the tough rod segment 310 and realize the self-repair of the valve stem 300.

[0064] In some embodiments, the elastic ring 316 disposed in the inner ring groove 314 includes a rubber ring and a buckle structure disposed on the outer circumference of the rubber ring, and the elastic ring 316 disposed in the outer ring groove 315 includes a rubber ring and a buckle structure disposed on the inner circumference of the rubber ring. The buckle structure has higher rigidity than the rubber ring, and the buckle structure is provided to facilitate the elastic ring 316 to be inserted into the inner ring groove 314 or the outer ring groove 315, and to achieve a more stable connection.

[0065] Combination Figure 3 , Figure 4 and Figure 8As shown, in some embodiments, the flow channel includes a main flow channel 111, an inlet flow channel 112 connected to the bottom of the main flow channel 111, and an outlet flow channel 113 connected to the side of the main flow channel 111; the connection between the inlet flow channel 112 and the main flow channel 111 is a first intersection, a valve seat 114 is provided at the first intersection, a first valve core 410 is provided at the valve seat 114, and the first valve core 410 is connected to the lower end of the first rod section; the valve stem 300 can drive the first valve core 410 to move up and down, so that the inlet flow channel 112 and the main flow channel 111 are in a connected state Switch between the cut-off state and the cut-off state; the connection between the outflow channel 113 and the main channel 111 is the second intersecting port; the second valve core 420 is arranged on the first rod section, and the setting height of the second valve core 420 satisfies: when the first valve core 410 cooperates with the valve seat 114, that is, when the first valve core 410 makes the inflow channel 112 and the main channel 111 in the cut-off state, the second valve core 420 is not higher than the lower edge of the second intersecting port; the valve stem 300 can drive the second valve core 420 to move between the lower edge and the upper edge of the second intersecting port to change the opening of the second intersecting port. The flow channel of the above structure and the first valve core 410 and the second valve core 420 can realize the separate control of the inflow and outflow. Even if one of the valve cores is damaged, the pneumatic control valve will not fail, which is conducive to the precise control of the flow rate and improves the service life and safety of the valve.

[0066] For example Figure 4 As shown, in some embodiments, the tough rod segment 310 is the rod segment of the valve stem 300 between the first valve core 410 and the second valve core 420, the first rod barrel 312 is fixedly connected to the second valve core 420, and the second rod barrel 313 is fixedly connected to the first valve core 410. The rod segment of the valve stem 300 between the first valve core 410 and the second valve core 420 is close to the first intersection, and is the part of the valve stem that is most susceptible to the impact of the power source medium and breaks. Setting it as the tough rod segment 310 can effectively improve the toughness of the valve stem 300. The first rod barrel 312 and the second valve core 420 can be set as an integrated structure, or they can be connected by a connection structure such as a thread or a connector; the second rod barrel 313 and the first valve core 410 can be set as an integrated structure, or they can be connected by a connection structure such as a thread or a connector. Among them, the connection stability of the integrated structure is high, the connection realized by the connection structure is convenient for assembly and disassembly, and the maintenance cost and difficulty are low.

[0067] Recombination Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8As shown, in some embodiments, an ellipsoidal chamber 115 is provided on the main channel 111, and the cross-sectional dimension of the ellipsoidal chamber 115 is larger than the cross-sectional dimension of the main channel 111. By providing an ellipsoidal chamber 115 with a larger cross-sectional dimension on the main channel 111 of the valve body 100, the flow cross-sectional area and spatial volume of the power source medium can be increased, and the speed at which the power source medium flows from the inlet flow channel 112 into the main channel 111 can be effectively reduced, thereby effectively reducing the impact on the regulating components in the valve during the operation of the valve. At the same time, the ellipsoidal structure of the ellipsoidal chamber 115 can, on the one hand, reduce the flow resistance and facilitate the smooth flow of the power source medium, and on the other hand, increase the strength of the valve body so that it can withstand a higher pressure difference; on the other hand, compared with structures of other shapes such as square and special shapes, the ellipsoidal chamber 115 is easier to cast and has a lower production cost.

[0068] In some embodiments, the ellipsoidal chamber 115 is preferably located between the lower edges of the first intersection and the second intersection to effectively reduce the impact on the tough rod segment 310 .

[0069] Recombination Figure 3 , Figure 4 and Figure 8 As shown, in some embodiments, a valve stem buffer structure is provided in the valve, and the valve stem buffer structure includes a third valve core 430 with an external thread, an internal flow channel thread matching the external thread on the third valve core 430, and a second flexible structure; the third valve core 430 is arranged on the first rod section and is located on the upper side of the second valve core 420; the internal flow channel thread is arranged on the side wall of the main flow channel 111 and is located on the upper side of the third valve core 430; the thread lead angle of the external thread on the third valve core 430 and the internal flow channel thread is greater than the equivalent friction angle, and the valve stem 300 can drive the third valve core 430 to move up and down, so that the external thread on the third valve core 430 and the internal flow channel thread switch between the mating state and the disengagement state; the second flexible structure is arranged on the first rod section and is located on the upper side of the third valve core 430. Among them, the second flexible structure can be multiple, for example: a flexible coupling, a bellows connection structure, a spring connection structure, etc. When the valve encounters a strong impact generated by the power source medium during operation, the external thread on the third valve core 430 can cooperate with the internal thread of the flow channel to resist the impact, and the main impact force can be transmitted to the second flexible structure for buffering, thereby effectively reducing the impact of the valve stem, valve wall and each valve core, especially reducing the impact of a sudden large group of power source medium, thereby improving the service life of the valve; moreover, since the thread lead angle of the external thread on the third valve core 430 and the internal thread of the flow channel is greater than the equivalent friction angle, the thread cooperation will not form self-locking. After the impact effect is reduced, it can be ensured that the valve stem 300 can drive the third valve core 430 to move, so that the thread cooperation is released and the valve returns to normal working state.

[0070] Combination Figure 4 and Figure 7 As shown, in some embodiments, the second flexible structure includes a cut-off 321 that divides the valve stem 300 into an upper valve stem section and a lower valve stem section, a lower boss 322 disposed at the bottom of the upper valve stem section, an upper boss 323 disposed at the top of the lower valve stem section, and a spring 324 that is sleeved on the lower boss 322 and the upper boss 323 and coaxially connects the upper valve stem section and the lower valve stem section. The second flexible structure is easy to manufacture and assemble. After the valve stem 300 encounters an impact, most of the impact effect can be concentrated on the spring 324 through the connection of the spring 324, so as to achieve buffering and energy absorption, and can reduce the impact of the power source medium, such as releasing elastic potential energy after a large mass of natural gas flows through, automatically releasing the cooperation between the external thread on the third valve core 430 and the internal thread of the flow channel, so that the valve returns to a normal working state.

[0071] Combination Figure 1 , Figure 2 , Figure 3 , Figure 8 and Fig. 9As shown, in some embodiments, the pneumatic regulating valve further includes a gas filter 500, which includes a filter body 510, a centrifugal fan blade 520, a shunt cartridge 530 and a water tank 540; a filter channel 511 is provided in the filter body 510, and the gas outlet of the filter channel 511 is connected to the medium inlet of the valve; the centrifugal fan blade 520 is rotatably arranged in the filter channel 511 through a fan blade shaft 521, and the fan blade shaft 521 is coaxial with the filter channel 511; the shunt cartridge 530 is arranged in the filter channel 511 downstream of the centrifugal fan blade 520, and is kept in contact with the filter channel 511 The downstream end of the flow divider 530 is connected to the channel wall of the filter channel 511 in a closed manner, so that an annular liquid collecting groove 512 is formed between the outer wall of the flow divider 530 and the wall surface of the filter channel 511, and the inner cavity of the flow divider 530 forms a clean air channel; the water tank 540 is arranged on the lower side of the filter body 510, and a liquid collecting pipe 541 and an exhaust pipe 542 are arranged on the top thereof, and a liquid drain pipe 543 is arranged on the side thereof; the liquid inlet of the liquid collecting pipe 541 is connected to the bottom of the annular liquid collecting groove 512, and the gas outlet of the exhaust pipe 542 is connected to the clean air channel and / or the filter channel 511 downstream of the flow divider 530. Among them, the downstream is determined according to the direction of the power source medium flowing in the gas filter 500. The gas filter can utilize the kinetic energy of the power source medium to drive the centrifugal blades 520 to rotate, and then the rotating centrifugal blades 520 can realize the gas-liquid stratification of the power source medium, wherein most of the gas phase flows into the valve through the clean gas channel, wherein the liquid phase and part of the gas phase will gather at the wall of the filter channel 511 under the action of centrifugal force, and move forward into the annular liquid collecting groove 512 formed between the outer wall of the diverter cylinder 530 and the wall of the filter channel 511, and then flow into the water tank 540 through the liquid collecting pipe 541 for collection, thereby realizing the separation of liquid impurities in the power source medium, and part of the gas phase entering the water tank 540 can return to the clean gas channel or the filter channel 511 downstream of the diverter cylinder 530 through the exhaust pipe 542, and then flow into the valve.

[0072] Combination Figure 8 and Fig. 9 As shown, in some embodiments, the centrifugal fan blade 520 includes a fan hub rotatably disposed on the fan shaft 521, and at least 10 evenly distributed curved blades are disposed on the circumference of the fan hub. The centrifugal fan blade 520 of this structure can better separate the gas and liquid, thereby improving the effect of the gas filter 500 in separating liquid impurities in the power source medium.

[0073] Recombination Figure 8 and Fig. 9As shown, in some embodiments, the gas filter 500 further includes a drainage control system, which includes a water level detector 551, a drainage solenoid valve and a drainage controller; the water level detector 551 is arranged in the water tank 540, and is used to detect whether the water level in the water tank 540 has reached a set height; the drainage solenoid valve is arranged on the drainage pipe 543, and is used to control the opening and closing of the drainage pipe 543; the drainage controller is respectively connected to the water level detector 551 and the drainage solenoid valve for controlling the drainage solenoid valve to open the drainage pipe 543 for drainage after the water level detector 551 detects that the water level in the water tank 540 has reached a set height. The drainage control system can ensure that after the liquid in the water tank 540 reaches a certain height, the liquid in the water tank 540 is automatically drained out, so as to ensure that the gas filter 500 can continue to work. The drainage control system can also control the drainage solenoid valve to close the drainage pipe 543 after the liquid in the water tank 540 is completely drained or discharged to the set water level.

[0074] The description of various embodiments of the present invention is presented herein for illustrative purposes only and is not intended to be exhaustive or limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terms used herein are selected to best explain the principles, practical applications, or technological advances of the embodiments, or to enable other persons skilled in the art to understand the embodiments disclosed herein, compared to the technology found on the market.

[0075] It should be understood that certain features of the invention described in the context of separate embodiments for the sake of clarity may also be provided in combination in a single embodiment. Conversely, various features of the invention described in the context of a single embodiment for the sake of brevity may also be provided individually or in any suitable sub-combination, or in any other described embodiment of the invention where appropriate. Certain features described in the context of various embodiments are not considered essential features of those embodiments unless the embodiments would not function without those features.

[0076] All publications, patents, and patent applications mentioned herein are incorporated herein by reference in their entirety, to the same extent as if each individual publication, patent, or patent application was specifically and individually indicated as being incorporated herein by reference. In addition, the citation or identification of any reference herein should not be construed as an admission that such reference is available as prior art to the present invention. To the extent that section headings are used, the section headings should not be construed as necessarily limiting.

Claims

1. A pneumatic regulating valve with toughness, comprising a valve, wherein the valve comprises a valve body (100) having a top opening and a flow channel, a valve cover (200) arranged at the top opening of the valve body (100), and a valve stem (300) vertically passing through the valve cover (200) and having a portion of the stem extending into the flow channel of the valve body (100); Features: The stem section of the valve stem (300) located in the flow channel of the valve body (100) is a first stem section, and at least part of the first stem section is a tough stem section (310). The tough stem section (310) comprises a stem section body (311), a first stem barrel (312), and a second stem barrel (313); The first rod tube (312) is sleeved on the rod segment body (311) and fixed relative to the upper end of the rod segment body (311); The second rod tube (313) is sleeved on the rod segment body (311) and fixed relative to the lower end of the rod segment body (311); The upper end of the second rod barrel (313) is coaxially connected to the lower end of the first rod barrel (312) via a first flexible structure; The upper end of the second rod tube (313) is nested with the lower end of the first rod tube (312), one of which is an outer sleeve and the other is an inner sleeve, and the wall surfaces where the two are nested are respectively a partial inner wall surface of the outer sleeve and a partial outer wall surface of the inner sleeve, the partial inner wall surface is a first wall surface, and the partial outer wall surface is a second wall surface; The first flexible structure comprises an inner ring groove (314), an outer ring groove (315) and an elastic ring (316); The inner annular groove (314) is provided on the first wall surface; The outer annular groove (315) is formed on the second wall surface, and its position embedded in the outer sleeve is deeper than the position of the inner annular groove (314) in the outer sleeve; The elastic ring (316) is arranged in the inner annular groove (314) and abuts against the second wall surface; or, the elastic ring (316) is arranged in the outer annular groove (315) and abuts against the first wall surface.

2. The pneumatic control valve with toughness according to claim 1, characterized in that: The flow channel comprises a main flow channel (111), an inlet flow channel (112) connected to the bottom of the main flow channel (111), and an outlet flow channel (113) connected to the side of the main flow channel (111); The connection between the inlet flow channel (112) and the main flow channel (111) is a first intersection, a valve seat (114) is provided at the first intersection, a first valve core (410) is provided at the valve seat (114), and the first valve core (410) is connected to the lower end of the first rod section; the valve rod (300) can drive the first valve core (410) to move up and down, so that the inlet flow channel (112) and the main flow channel (111) are switched between a connected state and a cut-off state; The connection between the outlet flow channel (113) and the main flow channel (111) is a second intersecting port; a second valve core (420) is arranged on the first rod section, and the arrangement height of the second valve core (420) satisfies: when the first valve core (410) is matched with the valve seat (114), the second valve core (420) is not higher than the lower edge of the second intersecting port; the valve stem (300) can drive the second valve core (420) to move between the lower edge and the upper edge of the second intersecting port to change the opening of the second intersecting port.

3. The pneumatic control valve with toughness according to claim 2, characterized in that: The tough rod section (310) is a rod section of the valve stem (300) between the first valve core (410) and the second valve core (420), the first rod tube (312) is fixedly connected to the second valve core (420), and the second rod tube (313) is fixedly connected to the first valve core (410).

4. The pneumatic control valve with toughness according to claim 2, characterized in that: An ellipsoidal chamber (115) is provided on the main channel (111), and the cross-sectional dimension of the ellipsoidal chamber (115) is greater than the cross-sectional dimension of the main channel (111).

5. The pneumatic control valve with toughness according to any one of claims 2 to 4, characterized in that: A valve stem buffer structure is provided in the valve, the valve stem buffer structure comprising a third valve core (430) with an external thread, an internal flow channel thread matching the external thread on the third valve core (430), and a second flexible structure; The third valve core (430) is arranged on the first rod section and is located on the upper side of the second valve core (420); The internal thread of the flow channel is arranged on the side wall of the main flow channel (111) and is located on the upper side of the third valve core (430); The thread lead angles of the external threads on the third valve core (430) and the internal threads of the flow channel are greater than the equivalent friction angle, and the valve stem (300) can drive the third valve core (430) to move up and down, so that the external threads on the third valve core (430) and the internal threads of the flow channel switch between a mating state and a disengaged state; The second flexible structure is arranged on the first rod section and is located on the upper side of the third valve core (430).

6. The pneumatic control valve with toughness according to claim 5, characterized in that: The second flexible structure comprises a cutout (321) for dividing the valve stem (300) into an upper valve stem section and a lower valve stem section, a lower boss (322) arranged at the bottom of the upper valve stem section, an upper boss (323) arranged at the top of the lower valve stem section, and a spring (324) sleeved on the lower boss (322) and the upper boss (323) and coaxially connecting the upper valve stem section and the lower valve stem section.

7. The pneumatic control valve with toughness according to any one of claims 1 to 4, characterized in that: Also included is a gas filter (500), wherein the gas filter (500) comprises a filter body (510), centrifugal blades (520), a flow splitter cylinder (530), and a water tank (540); A filter channel (511) is provided in the filter body (510), and an air outlet of the filter channel (511) is connected to a medium inlet of a valve; The centrifugal blade (520) is rotatably disposed in the filter channel (511) via a blade shaft (521), and the blade shaft (521) is coaxial with the filter channel (511); The flow dividing cylinder (530) is arranged in the filter channel (511) downstream of the centrifugal blades (520) and is coaxial with the filter channel (511); the downstream end of the flow dividing cylinder (530) is closed-type connected to the channel wall of the filter channel (511), so that an annular liquid collecting groove (512) is formed between the outer wall of the flow dividing cylinder (530) and the wall surface of the filter channel (511), and the inner cavity of the flow dividing cylinder (530) forms a clean air channel; The water tank (540) is arranged at the lower side of the filter body (510), and is provided with a liquid collecting pipe (541) and an exhaust pipe (542) at the top thereof, and a liquid drain pipe (543) at the side thereof; the liquid inlet of the liquid collecting pipe (541) is communicated with the bottom of the annular liquid collecting tank (512), and the air outlet of the exhaust pipe (542) is communicated with the clean air channel and / or the filter channel (511) downstream of the diverter cylinder (530).

8. The pneumatic control valve with toughness according to claim 7, characterized in that: The centrifugal fan blade (520) comprises a fan hub rotatably arranged on a fan blade shaft (521), and at least 10 evenly distributed curved blades are arranged on the circumference of the fan hub.

9. The pneumatic control valve with toughness according to claim 7, characterized in that: The gas filter (500) further comprises a drainage control system, wherein the drainage control system comprises a water level detector (551), a drainage solenoid valve and a drainage controller; The water level detector (551) is arranged in the water tank (540) and is used to detect whether the water level in the water tank (540) reaches a set height; The drainage solenoid valve is arranged on the drainage pipe (543) and is used to control the opening and closing of the drainage pipe (543); The drainage controller is respectively connected to the water level detector (551) and the drainage solenoid valve for communication, and is used to control the drainage solenoid valve to open the drainage pipe (543) to drain water after the water level detector (551) detects that the water level in the water tank (540) reaches a set height.

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