Multistage buffering toughness stop valve

Abstract

The invention discloses a multi-stage buffering toughness stop valve, relates to the technical field of valves, and aims to solve the problem that an existing valve cannot effectively relieve the impact of fluid on a valve element. A valve element of the stop valve is mainly composed of an outer valve element body, a middle valve element body and an inner valve element body, the inner valve element body is arranged in an element cavity defined by the outer valve element body and the middle valve element body in an axial moving mode, an elastic assembly is arranged between the inner valve element body and the inner end wall face of the element cavity, and therefore when fluid impacts the valve element, the valve element is not damaged. The fluid flowing into the core cavity can drive the inner valve element to move axially and extrude the elastic assembly, part of kinetic energy of the fluid is converted into elastic potential energy of the elastic assembly, the impact effect of the fluid on the valve element is relieved, particularly transient impact caused by fluid flow speed changes is relieved, the service life of the valve element is prolonged, and the reliability of the valve element is improved. Moreover, the internal cavity channel of the valve core of the stop valve can reduce the flow speed of the fluid and improve the flowing stability of the fluid, so that the impact of the fluid on the valve core is further relieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and particularly relates to a multi-stage buffer resilient globe valve. Background Art

[0002] A valve is a pipeline accessory widely used in the field of oil and gas transportation, and can be used to open and close pipelines, control the flow direction, and adjust and control parameters such as the temperature, pressure, and flow rate of the transported medium. However, core components such as the valve core of the valve are directly impacted by high-speed and high-pressure fluids. After long-term use, the sealing surface of the valve core often wears due to chemical corrosion, medium erosion, mechanical damage, fatigue damage, etc. Since the sealing surface of the valve core is an important structure related to whether the valve can be normally sealed, its wear will greatly reduce the reliability of the valve core in use. Also, because the valve core is located inside the valve cavity and cannot be directly observed, when there is wear at a certain point on the sealing surface of the valve core, it cannot be quickly located and identified, and it is difficult to locate and detect the fault point. In the past, maintaining the sealing surface of the valve core usually required the overall disassembly of the valve, which was extremely inconvenient; moreover, disassembling and repairing the valve would cause the fluid transportation system to stop working, seriously affecting the progress efficiency of engineering projects, and consuming a large amount of time, economic and other costs.

[0003] Existing valves lack a fluid buffer structure and cannot effectively relieve the impact of the fluid on the valve core, which is not conducive to the long-term use of the valve core. In order to improve the toughness of the sealing surface of the valve core, a Chinese invention patent application with the publication number CN106224572A discloses a double-valve-core double-sealing-surface regulating valve, which includes a cavity surrounded by a valve body and a valve cover. The valve body has a valve inlet and a valve outlet communicating with the cavity. A valve core and a valve seat are provided in the cavity. The valve core is composed of a main valve core and a sub-valve core. The valve seat is provided with a first sealing surface and a second sealing surface respectively cooperating with the main valve core and the sub-valve core. The main valve core and the sub-valve core are in an adjustable fixed connection. By adjusting the relative position between the main valve core and the sub-valve core, it can be made that when the main valve core fits with the first sealing surface, the sub-valve core is separated from the second sealing surface; or when the sub-valve core fits with the second sealing surface, the main valve core is separated from the first sealing surface. This regulating valve effectively improves the service life of the valve by setting a double-valve-core double-sealing-surface, and can still use the sub-sealing pair to achieve sealing in the case of the failure of the main sealing pair.

[0004] Regarding the identification and positioning of the worn part of the sealing surface of the valve core, it usually relies on manual experience judgment and disassembling the valve to confirm, with low reliability and certainty and extremely inconvenient; in large-scale engineering projects, globe valves are widely used. When the problem of wear on the sealing surface of the valve core occurs, it is difficult to quickly locate the worn part only by manual labor, and the human cost and time cost required for problem troubleshooting are relatively large, seriously affecting production and the progress of subsequent projects.

[0005] Regarding the maintenance of the valve core sealing surface, due to the lack of self-repair function of the valve core sealing surface, it is currently often necessary to manually disassemble the valve and then replace the new valve core, which is extremely inconvenient, with low maintenance efficiency and high manual labor intensity. Moreover, the replacement of the new valve core often requires the shutdown of the machine and cannot be repaired online, reducing the production efficiency and being unfavorable to the progress of the engineering project. Summary of the Invention

[0006] The present invention provides a multi-stage buffer resilient stop valve, aiming to solve the problem that the existing valves cannot effectively alleviate the impact of fluid on the valve core.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a multi-stage buffer resilient stop valve, including a valve body and a valve core;

[0008] The valve body has a valve cavity, a valve inlet and a valve outlet respectively communicating with the valve cavity, and a valve seat is provided in the valve cavity;

[0009] The valve core is axially movably arranged in the valve cavity and forms an opening and closing mechanism with the valve seat that can control the on-off of the valve inlet and the valve outlet; the valve core includes an outer valve core, a middle valve core and an inner valve core;

[0010] The outer valve core and the middle valve core are nested and cooperated to enclose a core cavity; an outer core outflow hole is provided on the side wall of the outer valve core, and the outer core outflow hole can move with the valve core to a position connected to the valve outlet; when the valve core is matched with the valve seat, the outer core outflow hole is blocked by the wall surface of the valve seat;

[0011] A valve core inflow hole communicating the valve inlet and the core cavity is provided on the middle valve core, and a middle core outflow hole is provided on the side wall of the middle valve core; the middle core outflow hole is communicated with the outer core outflow hole, and at least part of the projection of the middle core outflow hole along its orientation is on the hole wall of the outer core outflow hole;

[0012] The inner valve core is axially movably arranged in the core cavity, and an elastic component is arranged between the end of the inner valve core far from the valve core inflow hole and the inner end wall surface of the core cavity; the inner valve core has a connected inner core inflow channel and an inner core outflow channel, the channel inlet of the inner core inflow channel is communicated with the core cavity, the channel outlet of the inner core outflow channel is communicated with the middle core outflow hole, and at least part of the projection of the channel outlet along its orientation is on the hole wall of the middle core outflow hole.

[0013] Further, the outer core outflow holes are at least three and are annularly arrayed around the axis of the valve core;

[0014] The number of the middle core outflow holes is more than the number of the outer core outflow holes and is annularly arrayed around the axis of the valve core;

[0015] The number of channel outlets of the inner core outflow channel is larger than the number of the central core outflow holes, and they are distributed in an annular array around the axis of the valve core.

[0016] Furthermore, the inner core inflow channel is coaxial with the inner valve core;

[0017] The inner core outflow channel includes a channel confluence cavity and inner core outflow branches arranged radially along the inner valve core;

[0018] The inner core inflow channel has an inner core inflow connection section communicating with the channel confluence cavity and an inner core inflow energy dissipation groove located above the channel confluence cavity.

[0019] Furthermore, the elastic component includes a main buffer spring and a secondary buffer spring;

[0020] The main buffer spring is coaxial with the inner valve core;

[0021] The secondary buffer springs are at least three in number and are distributed in an annular array around the main buffer spring.

[0022] Furthermore, the bottom of the outer valve core is a valve core sealing part. The bottom surface of the valve core sealing part is a first valve core sealing surface for sealing cooperation with the annular table surface of the valve seat, and the outer peripheral surface of the valve core sealing part is a second valve core sealing surface for sealing cooperation with the wall surface of the valve seat;

[0023] The valve core further includes a sealing part self - recovery mechanism. The sealing part self - recovery mechanism includes a receiving groove and at least two self - recovery components arranged in the receiving groove; the receiving groove is opened on the outer wall of the outer valve core and is located above the valve core sealing part and below the outer core outflow holes;

[0024] The self - recovery components include a tooth box, a tooth box top cover, and recovery teeth; the tooth box and the tooth box top cover are cooperatively connected to enclose a tooth - containing cavity. An exposed - tooth opening is provided at the bottom of the outer wall of the tooth - containing cavity; the recovery teeth are at least two in number and are arranged in the tooth - containing cavity with their sides in contact with each other; the recovery teeth include tooth bodies and repair parts arranged at the bottom edge of the tooth bodies and protruding outward to the exposed - tooth opening;

[0025] The second valve core sealing surface, the outer side surface of the tooth box top cover, and the outer side surfaces of the respective repair parts are coplanar and smoothly transition and connect;

[0026] The tooth box top cover is provided with a box - cover groove communicating with the tooth - containing cavity. The top surface of the receiving groove, the wall surface of the box - cover groove, and the top surfaces of the respective recovery teeth together enclose a self - recovery flow - containing cavity; for any two adjacent self - recovery components, their self - recovery flow - containing cavities communicate with each other; a self - recovery inflow channel is opened in the outer valve core to connect at least one self - recovery flow - containing cavity with the outer core outflow holes.

[0027] Further, the accommodation groove is an arc-shaped groove or an annular groove opened along the circumferential direction of the outer valve core;

[0028] There are at least two self-restoring inflow channels, which are distributed in an annular array around the axis of the valve core.

[0029] Further, the stop valve further includes a valve cover and a valve stem;

[0030] The valve cavity penetrates upward to the top surface of the valve body, and a valve top opening is formed on the top surface of the valve body;

[0031] The valve cover is sealingly arranged at the valve top opening;

[0032] The valve stem is vertically arranged through the valve cover, and its lower end extends into the valve cavity and is connected to the valve core.

[0033] Further, the valve cavity has an ellipsoidal chamber on the upper side of the valve seat, and the cross-sectional dimension of the ellipsoidal chamber is larger than the cross-sectional dimension of other parts of the valve cavity;

[0034] The valve outlet communicates with the ellipsoidal chamber.

[0035] Further, the stop valve further includes a partition buffer device arranged at the valve inlet and / or the valve outlet. The partition buffer device includes a first buffer housing, a second buffer housing and a buffer partition;

[0036] The first buffer housing and the second buffer housing of the buffer device are cooperatively connected and enclose to form a fluid buffer chamber;

[0037] The first buffer housing of the buffer device is provided with a buffer inlet communicating with the fluid buffer chamber, and the second buffer housing of the buffer device is provided with a buffer outlet communicating with the fluid buffer chamber;

[0038] At least two uniformly distributed buffer holes are formed in the buffer partition; there are at least two buffer partitions, which are arranged at intervals in the fluid buffer chamber; the buffer partitions are arranged perpendicular to the flow direction of the fluid buffer chamber, and a buffer spring is arranged between any two adjacent buffer partitions.

[0039] Further, for any two adjacent buffer partitions, the buffer holes thereof are staggeredly distributed;

[0040] The buffer spring includes a first buffer spring supported at the central part of the buffer partition and a second buffer spring supported at the edge part of the buffer partition.

[0041] The beneficial effects of the present invention are as follows:

[0042] (1) The valve core of this globe valve is mainly composed of an outer valve core, a middle valve core, and an inner valve core. By axially movably arranging the inner valve core in the core cavity formed by the outer valve core and the middle valve core, and arranging an elastic component between the inner valve core and the inner end wall surface of the core cavity, when the fluid impacts the valve core, the fluid flowing into the core cavity can drive the inner valve core to axially move and compress the elastic component, converting part of the kinetic energy of the fluid into the elastic potential energy of the elastic component, so as to relieve the impact of the fluid on the valve core, especially to relieve the transient impact caused by the change of fluid flow rate, and improve the service life and reliability of the valve core.

[0043] (2) The valve core of this globe valve has a valve core inlet flow hole, a core cavity, an inner core inlet flow channel, an inner core outlet flow channel, a middle core outlet flow hole, and an outer core outlet flow hole that are connected in sequence. And the channel outlet of the inner core outlet flow channel is at least partially located on the hole wall of the middle core outlet flow hole along the projection of its orientation, and the middle core outlet flow hole is at least partially located on the hole wall of the outer core outlet flow hole along the projection of its orientation; in this way, on the one hand, the flow direction and path of the fluid can be changed, which can increase the air travel and residence time of the fluid under the condition that the kinetic energy at the release position remains unchanged, thereby reducing the fluid flow rate and improving the stability of fluid flow, so as to effectively relieve the impact of the fluid on the valve core; on the other hand, the hole wall of the middle core outlet flow hole and the hole wall of the outer core outlet flow hole can absorb part of the fluid impact energy, further reducing the fluid flow rate and pressure, so as to effectively reduce the impact of the fluid on the valve core, and at the same time, the erosion of the fluid on the valve core sealing surface is also effectively reduced.

[0044] (3) Through the self-recovery mechanism of the sealing part provided on the valve core of this globe valve, when there is wear at a certain place of the valve core sealing part, the pressure of the fluid flowing into the self-recovery volume cavity through the self-recovery inlet flow channel can press down the recovery teeth corresponding to the worn part of the valve core sealing part, and then the worn part can be repaired by the repair part of the recovery teeth, realizing the self-repair of the valve core sealing part; in this way, not only can the worn part of the valve core sealing part be automatically identified and positioned through the mechanical structure, realizing the rapid identification of wear faults, but also the automatic repair of the worn part of the valve core sealing part can be realized under the drive of fluid pressure. The whole process does not require manual intervention, has high reliability, extremely fast self-repair speed, and the repair process can be carried out online without shutdown operation, which is conducive to ensuring the continuous production.

[0045] (4) The stop valve can, by providing a baffle buffer device at the valve inlet, increase the flow space of the fluid before the fluid flows into the valve cavity, thereby effectively reducing the instantaneous velocity of the fluid and further reducing the impact of the fluid on the valve core; on the other hand, the baffle buffer device can convert part of the fluid pressure into pressure on the first shell and the second shell of the buffer device, and the relatively large contact area between the two shells can reduce the contact pressure of the fluid, thereby buffering the fluid; on the other hand, the buffer hole opened on the buffer baffle and the buffer spring provided between two adjacent buffer baffles can effectively buffer the fluid. At the same time, the stop valve can not only further buffer the fluid by providing a baffle buffer device at the valve outlet, but also cooperate with the baffle buffer device at the valve inlet to buffer the fluid before reaching the valve core and after leaving the valve core, thereby ensuring the reliability of the stop valve and extending the service life of the valve core.

[0046] 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

[0047] Figure 1 is a three-dimensional axonometric drawing of an embodiment of the present invention;

[0048] Figure 2 It is a schematic cross-sectional view of an embodiment of the present invention;

[0049] Figure 3 It is along Figure 2 Cross-sectional view along line AA;

[0050] Figure 4 It is along Figure 3 Cross-sectional view along the midline BB;

[0051] Figure 5 It is a three-dimensional axonometric view of the valve core and valve stem;

[0052] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure;

[0053] Figure 7 yes Figure 6 A partial enlarged view of point C in the middle;

[0054] Figure 8 It is a three-dimensional axonometric drawing of a plurality of self-restoring components arranged in sequence along an arc-shaped receiving groove;

[0055] Figure 9 is a three-dimensional axonometric drawing of another embodiment of the present invention;

[0056] Figure 10 It is a three-dimensional axonometric drawing of the partition buffer device;

[0057] In the figure, the markings are: 1 - valve body, 11 - valve cavity, 111 - valve seat, 112 - valve top opening, 113 - ellipsoidal chamber, 12 - valve inlet, 13 - valve outlet, 2 - valve core, 201 - core cavity, 21 - outer valve core, 211 - outer core outflow hole, 212 - first valve core sealing surface, 213 - second valve core sealing surface, 22 - middle valve core, 221 - valve core inflow hole, 222 - middle core outflow hole, 23 - inner valve core, 231 - inner core inflow channel, 2311 - inner core inflow energy dissipation groove, 232 - inner core outflow channel, 2321 - channel confluence chamber, 2322 - inner core outflow branch, 241 - main buffer spring, 242 - auxiliary buffer spring, 25 - self - recovery mechanism of the sealing part, 251 - receiving groove, 252 - tooth box, 253 - tooth box top cover, 254 - recovery tooth, 2541 - tooth main body, 2542 - repair part, 255 - tooth - containing cavity, 256 - self - recovery flow - containing cavity, 257 - self - recovery inflow channel, 3 - valve cover, 4 - valve rod, 5 - partition buffer device, 51 - first housing of the buffer device, 511 - buffer inflow port, 52 - second housing of the buffer device, 521 - buffer outflow port, 53 - buffer partition, 531 - buffer hole, 541 - first buffer spring, 542 - second buffer spring. Detailed implementation mode

[0058] The present invention will be further described below in conjunction with the drawings and embodiments. The same reference numerals in the drawings denote components with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, unless otherwise specified, the drawings do not have to be drawn to scale.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position and dimensional relationship based on the orientation or position relationship shown in the drawings. It is only for the convenience of description and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0060] In the description of the present invention, when the term "plurality" indicates a quantity, it generally refers to a quantity of three or more. For example, "a plurality" generally refers to three or more. The expression of the term "consisting essentially of... or constituted by..." is interpreted as also being able to contain structural components not mentioned in this sentence. The term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0061] Combined with Figure 1 、 Figure 2 、 Figure 3 And Figure 4 As shown, the multi-stage buffer resilient stop valve includes a valve body 1 and a valve core 2;

[0062] The valve body 1 has a valve cavity 11, a valve inlet 12 and a valve outlet 13 that are respectively communicated with the valve cavity 11. The valve outlet 13 is the position where the fluid flows out after being regulated by the valve. One, two or more valve outlets 13 can be provided according to needs. Flange structures for connecting to pipelines are usually provided at both the valve inlet 12 and the valve outlet 13. A valve seat 111 is provided in the valve cavity 11. The valve seat 111 is mainly used to support and position the valve core 2 and provide a sealing surface for sealing cooperation with the valve core 2;

[0063] The valve core 2 is axially movably arranged in the valve cavity 11 and forms an opening and closing mechanism with the valve seat 111 that can control the on-off of the valve inlet 12 and the valve outlet 13. Usually, when the valve core 2 cooperates with the valve seat 111, the flow channel of the valve cavity will be cut off so that the valve inlet 12 and the valve outlet 13 are not communicated. When the valve core 2 axially moves away from the valve seat 111, the flow channel of the valve cavity will be opened, and the fluid flow rate regulated increases as the opening degree of the valve cavity flow channel increases. The valve cavity flow channel refers to the spatial part of the valve cavity 11 for communicating the valve inlet 12 and the valve outlet 13;

[0064] The valve core 2 includes an outer valve core 21, a middle valve core 22 and an inner valve core 23;

[0065] The outer valve core 21 is nested and cooperated with the middle valve core 22 and encloses to form a core cavity 201. Outer core outflow holes 211 are provided on the side wall of the outer valve core 21. The outer core outflow holes 211 can move to a position communicated with the valve outlet 13 along with the valve core 2. When the valve core 2 cooperates with the valve seat 111, the outer core outflow holes 211 are blocked by the wall surface of the valve seat 111;

[0066] The middle valve core 22 is provided with a valve core inlet hole 221 that connects the valve inlet 12 and the core cavity 201. A middle core outlet hole 222 is provided on the side wall of the middle valve core 22. The middle core outlet hole 222 is communicated with the outer core outlet hole 211, and at least a part of the projection of the middle core outlet hole 222 along its orientation is located on the hole wall of the outer core outlet hole 211, so as to ensure that at least a part of the fluid flowing out of the middle core outlet hole 222 impacts on the hole wall of the outer core outlet hole 211 for energy dissipation. Generally, the middle valve core 22 is fixedly connected to the outer valve core 21 through a connecting piece.

[0067] The inner valve core 23 is axially movably arranged in the core cavity 201. An elastic component is arranged between the end of the inner valve core 23 far from the valve core inlet hole 221 and the inner end wall surface of the core cavity 201. The elastic component is used to convert part of the kinetic energy of the fluid flowing into the core cavity 201 into elastic potential energy to relieve the impact of the fluid on the valve core 2, and can drive the inner valve core 23 to reset when no external force acts on the inner valve core 23. The elastic component can be a spring or a component composed of multiple springs, an elastic member made of rubber or the like. Usually, it is in a pre-tightened state. The inner valve core 23 has a connected inner core inlet channel 231 and an inner core outlet channel 232. The channel inlet of the inner core inlet channel 231 is communicated with the core cavity 201, and the channel outlet of the inner core outlet channel 232 is communicated with the middle core outlet hole 222. And at least a part of the projection of the channel outlet along its orientation is located on the hole wall of the middle core outlet hole 222, so as to ensure that at least a part of the fluid flowing out of the channel outlet of the inner core outlet channel 232 impacts on the hole wall of the middle core outlet hole 222 for energy dissipation.

[0068] During the working process of the globe valve, the fluid flows from the valve inlet 12 to the valve cavity 11. Since the valve core 2 and the valve seat 111 cooperate to cut off the flow path of the valve cavity at this time, the fluid will impact the sealing surface of the valve core. Part of the fluid flows into the core cavity 201 from the valve core inlet hole 221. The fluid flowing into the core cavity 201 will drive the inner valve core 23 to axially move and squeeze the elastic component, converting part of the kinetic energy of the fluid into the elastic potential energy of the elastic component to relieve the impact of the fluid on the valve core 2, especially effectively relieving the transient impact caused by the change of the fluid flow rate. At the same time, the fluid sequentially flows through the valve core inlet hole 221, the core cavity 201, the inner core inlet channel 231, the inner core outlet channel 232, the middle core outlet hole 222 and the outer core outlet hole 211 inside the valve core 2. The flow path increases and the flow direction changes from axial to lateral. When the globe valve is not opened, that is, when the valve core 2 has not completely left the valve seat 111, the fluid inside the valve core 2 reaches the outer core outlet hole 211 and is blocked by the wall surface of the valve seat 111 and waits to flow out.

[0069] As the fluid pressure increases, the valve core 2 axially moves to a position where the outer core outflow hole 211 communicates with the valve outlet 13. At this time, the fluid is initially released through the path "valve inlet 12 → internal cavity of the valve core 2 → valve cavity flow channel → valve outlet 13". In this way, the distance between the just-released position of the fluid and the valve core sealing surface increases, thereby reducing the fluid flow rate and improving the stability of its flow. When the initial kinetic energy of the fluid remains unchanged at the just-released position, the impact of the fluid on the valve core sealing surface is reduced due to the increased air travel, thus effectively alleviating the impact of the fluid on the valve core 2. Also, since the channel outlet of the inner core outflow channel 232 is at least partially on the pore wall of the middle core outflow hole 222 along its projection direction, and the middle core outflow hole 222 is at least partially on the pore wall of the outer core outflow hole 211 along its projection direction, at least part of the fluid flowing out from the channel outlet of the inner core outflow channel 232 will impact the pore wall of the middle core outflow hole 222, and at least part of the fluid flowing out from the middle core outflow hole 222 will impact the pore wall of the outer core outflow hole 211. Furthermore, the pore walls of the middle core outflow hole 222 and the outer core outflow hole 211 can absorb part of the fluid impact energy, further reducing the fluid flow rate and pressure to reduce the impact of the fluid on the valve core 2. At the same time, the erosion of the fluid on the valve core sealing surface is also effectively reduced, improving the reliability of the valve core 2.

[0070] As the fluid pressure further increases, the fluid drives the valve core 2 to axially move away from the valve seat 111, opening the valve cavity flow channel. At this time, the fluid can also be further released through the path "valve inlet 12 → valve cavity flow channel → valve outlet 13". Since the fluid has been initially released, the pressure of the further-released fluid is significantly reduced, and the initially released fluid in the valve cavity 11 can buffer the subsequently released fluid. Therefore, the impact of the fluid on the valve core 2 can be further reduced, and the erosion of the fluid on the valve core sealing surface is greatly reduced.

[0071] During the whole process, when there is continuous fluid flowing into the core cavity 201, the pressure of the fluid on the inner valve core 23 and the elastic force of the elastic component on the inner valve core 23 are in dynamic equilibrium. After the fluid is released, the elastic potential energy stored in the elastic component is gradually released until the inner valve core 23 resets.

[0072] Combined with Figure 3 and Figure 4As shown, in order to allow the fluid to flow out evenly from each layer of the valve core 2, preferably, there are at least three outer core outflow holes 211, which are distributed in a circular array around the axis of the valve core 2; the number of center core outflow holes 222 is greater than the number of outer core outflow holes 211, and are distributed in a circular array around the axis of the valve core 2; the number of channel outlets of the inner core outflow channel 232 is greater than the number of center core outflow holes 222, and are distributed in a circular array around the axis of the valve core 2. The number of outflow structures in each layer of the valve core 2 decreases layer by layer from the inside to the outside, which not only ensures the patency of the internal cavity of the valve core 2, but also improves the stability of the outflow, so as to further buffer the fluid. Normally, the size of the outer core outflow hole 211 is larger than the size of the center core outflow hole 222, and the size of the center core outflow hole 222 is larger than the size of the channel outlet of the inner core outflow channel 232. At least one of the multiple center-core outflow holes 222 has its projection along its direction at least partially located on the hole wall of the outer-core outflow hole 211, and at least one of the multiple inner-core outflow channels 232 has its channel outlet projected along its direction at least partially located on the hole wall of the center-core outflow hole 222, thereby achieving the impact energy dissipation effect.

[0073] Combine Figure 2 、 Figure 3 and Figure 4 As shown, in some embodiments, the inner core inlet channel 231 is coaxial with the inner valve core 23; the inner core outlet channel 232 includes a channel confluence cavity 2321 and an inner core outlet branch 2322 arranged radially along the inner valve core 23; the inner core inlet channel 231 has an inner core inlet connecting section that is in communication with the channel confluence cavity 2321, and an inner core inlet energy dissipation groove 2311 located above the channel confluence cavity 2321. The inner core inlet energy dissipation groove 2311 can guide the fluid flowing into the inner valve core 23 and eliminate part of the kinetic energy of the fluid to buffer the fluid; moreover, the inner core inlet energy dissipation groove 2311 can also concentrate the impact of the fluid on the inner valve core 23 on the axial direction of the inner valve core 23, thereby reducing the radial runout of the inner valve core 23 caused by changes in the fluid flow rate and improving its service life.

[0074] Combine Figure 2 and Figure 3 As shown, to improve the load-bearing capacity, stability, and durability of the elastic assembly and to cope with the uneven impact of the fluid on the inner valve core 23, the elastic assembly preferably includes a main buffer spring 241 and a secondary buffer spring 242. The main buffer spring 241 is coaxial with the inner valve core 23, and there are at least three secondary buffer springs 242 distributed in an annular array around the main buffer spring 241. To facilitate the installation and positioning of the main buffer spring 241 and the secondary buffer spring 242, structures such as a spring column, a spring cylinder, and a spring seat are generally provided at the installation location.

[0075] Combine Figure 2 、 Figure 3 、 Figure 5 、 Figure 6, Figure 7 and Figure 8 As shown in Figure 7 and Figure 8 , in some embodiments, the bottom of the outer valve core 21 is a valve core sealing portion. The bottom surface of the valve core sealing portion is a first valve core sealing surface 212 for sealingly mating with the annular table surface of the valve seat 111, and the outer peripheral surface of the valve core sealing portion is a second valve core sealing surface 213 for sealingly mating with the wall surface of the valve seat 111.

[0076] The valve core 2 further includes a sealing portion self - recovery mechanism 25. The sealing portion self - recovery mechanism 25 includes a receiving groove 251 and at least two self - recovery components disposed in the receiving groove 251. The receiving groove 251 is opened on the outer wall of the outer valve core 21, and is located above the valve core sealing portion and below the outer core outflow hole 211.

[0077] The self - recovery component includes a tooth box 252, a tooth box top cover 253 and a recovery tooth 254. The tooth box 252 and the tooth box top cover 253 are cooperatively connected and enclose a tooth - containing cavity 255. An exposed - tooth opening is formed at the bottom of the outer wall of the tooth - containing cavity 255. There are at least two recovery teeth 254, which are disposed in the tooth - containing cavity 255 with their sides in contact with each other. The recovery tooth 254 includes a tooth body 2541 and a repair portion 2542 provided at the bottom edge of the tooth body 2541 and protruding outward to the exposed - tooth opening. Usually, the top surface size of the tooth body 2541 is larger than the bottom surface size of the repair portion 2542.

[0078] The second valve core sealing surface 213, the outer side surface of the tooth box top cover 253 and the outer side surfaces of the respective repair portions 2542 are coplanar and smoothly transitionally connected.

[0079] The tooth box top cover 253 is provided with a box - cover groove communicating with the tooth - containing cavity 255. The top surface of the receiving groove 251, the groove wall surface of the box - cover groove and the top surfaces of the respective recovery teeth 254 together enclose a self - recovery flow - containing cavity 256. For any two adjacent self - recovery components, their self - recovery flow - containing cavities 256 communicate with each other. A self - recovery inflow channel 257 is opened in the outer valve core 21 to communicate at least one self - recovery flow - containing cavity 256 with the outer core outflow hole 211.

[0080] Under normal operating conditions, the valve core 2 is hermetically fitted with the valve seat 111 through the valve core sealing part to close the globe valve. During the operation of the globe valve, the fluid flowing to the outer core outflow hole 211 can flow into the self-restoring inflow cavity 256 from the self-restoring inflow channel 257. Through the provided sealing part self-restoring mechanism 25, when a certain part of the valve core sealing part is worn to the point of being missing, the worn part loses the limiting effect on the restoring tooth 254. Under the pressure of the fluid flowing into the self-restoring inflow cavity 256, the restoring tooth 254 corresponding to the worn part of the valve core sealing part will be pressed down, and then the worn part will be compensated by the repairing part 2542 of the restoring tooth 254, realizing the self-repair of the valve core sealing part; and because the top surface area of the tooth main body 2541 is larger than the bottom surface area of the repairing part 2542, the pressure of the fluid on the top of the restoring tooth 254 is greater than the pressure of the fluid on the bottom, so the repairing part 2542 can be kept at the worn part during the operation of the globe valve after repair; thus, not only can the worn part of the valve core sealing part be automatically identified and located through the mechanical structure, realizing the rapid identification of wear faults, but also the automatic repair of the worn part of the valve core sealing part can be realized under the drive of the fluid pressure. The whole process does not require manual intervention, has high reliability, extremely fast self-repair speed, and the repair process can be carried out online without shutdown operation, which is conducive to ensuring the continuous production.

[0081] Combined with Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, preferably, the receiving groove 251 is an arc-shaped groove or an annular groove opened along the circumferential direction of the outer valve core 21; the self-restoring inflow channels 257 are at least two and are distributed in an annular array around the axis of the valve core 2. The arc-shaped groove or annular groove of the receiving groove 251 is conducive to realizing the setting of the self-restoring component at most positions on the upper side of the valve core sealing part, especially on the upper side of the part of the valve core sealing part that is easily eroded and worn, so as to realize the effective repair of the worn part of the valve core sealing part.

[0082] Combined with Figure 1 、 Figure 2 and Figure 3 As shown, specifically, the globe valve further includes a valve cover 3 and a valve stem 4; the valve cavity 11 penetrates upward to the top surface of the valve body 1 and forms a valve top opening 112 on the top surface of the valve body 1; the valve cover 3 is hermetically arranged at the valve top opening 112; the valve stem 4 is vertically arranged through the valve cover 3, and its lower end extends into the valve cavity 11 and is connected to the valve core 2. Among them, the valve stem 4 is used for driving connection with the actuator to transmit the control power to the valve core 2; the actuator can be a pneumatic actuator, an electromagnetic drive actuator, a manual actuator or an actuator of other drive forms.

[0083] Combined with Figure 2 、 Figure 3 and Figure 4As shown, on the above basis, it is preferably that the bottom of the outer valve core 21 is provided with an outer valve core groove, the middle valve core 22 is cylindrical and is embedded in the outer valve core groove, the lower end of the middle valve core 22 is provided with a middle valve core bottom plate, and the valve core inlet flow hole 221 is opened on the middle valve core bottom plate.

[0084] Combined with Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, in order to guide the valve core 2, a guiding mechanism is usually arranged between the outer valve core 21 and the cavity wall of the valve cavity 11. The guiding mechanism can be a convex part and a guiding groove that cooperate with each other, a socket and a guide rail that cooperate with each other, and so on.

[0085] Combined with Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the valve cavity 11 has an ellipsoidal chamber 113 above the valve seat 111, and the cross-sectional dimension of the ellipsoidal chamber 113 is larger than the cross-sectional dimensions of other parts of the valve cavity 11; the valve outlet 13 is communicated with the ellipsoidal chamber 113. The ellipsoidal chamber 113 can not only increase the area and spatial volume of the fluid flow cross-section to effectively reduce the fluid velocity, thereby reducing the impact of the fluid on the valve core 2, the valve stem 4 and other internal parts of the valve body, but also the ellipsoidal chamber 113 can increase the strength of the valve body 1 and is convenient for processing and manufacturing.

[0086] Combined with Figure 9 and Figure 10As shown, in some embodiments, the globe valve further includes a partition buffer device 5 disposed at the valve inlet 12 and / or the valve outlet 13. The partition buffer device 5 includes a first buffer device housing 51, a second buffer device housing 52, and a buffer partition 53. The first buffer device housing 51 and the second buffer device housing 52 are cooperatively connected and enclose a fluid buffer chamber. The first buffer device housing 51 is provided with a buffer inlet 511 communicating with the fluid buffer chamber, and the second buffer device housing 52 is provided with a buffer outlet 521 communicating with the fluid buffer chamber. The buffer partition 53 is provided with at least two evenly distributed buffer holes 531. There are at least two buffer partitions 53, which are spaced apart in the fluid buffer chamber. The buffer partition 53 is disposed perpendicular to the flow direction of the fluid buffer chamber, and a buffer spring is disposed between any two adjacent buffer partitions 53. By providing the partition buffer device 5, on the one hand, the flow space of the fluid can be increased before the fluid flows into the valve chamber 11, so as to effectively reduce the instantaneous velocity of the fluid, and further reduce the impact of the fluid on the valve core 2. On the other hand, part of the fluid pressure can be converted into the pressure on the first buffer device housing 51 and the second buffer device housing 52, and the relatively large contact area between the two housings can reduce the contact pressure of the fluid, thereby buffering the fluid. On the third hand, the buffer holes 531 provided on the buffer partition 53 and the buffer springs disposed between two adjacent buffer partitions 53 can effectively buffer the fluid. In addition, the partition buffer device 5 is relatively independent of other components of the globe valve, and the installation position is free, which is beneficial to reducing the impact of fluids such as natural gas and oil transported by the transportation system on the pipe bends and the valve core 2, etc., and is also beneficial to improving the compatibility of the globe valve with different engineering environments and working conditions.

[0087] Again, Figure 9 As shown, in some embodiments, the globe valve has two valve outlets 13, and an inlet pipe is connected to the valve inlet 12. Partition buffer devices 5 are provided at the valve inlet 12, the valve outlets 13, and the inlet of the inlet pipe. In this way, not only can the fluid be effectively buffered before flowing into the valve chamber 11, but also the partition buffer devices 5 at the inlet and outlet of the globe valve can cooperate to buffer the flow, so that the fluid is buffered both before reaching the valve core 2 and after leaving the valve core 2, thereby ensuring the reliability of the valve core 2 and extending its service life.

[0088] For example, Figure 10As shown, in some embodiments, the buffer holes 531 of any two adjacent buffer baffles 53 are staggered; that is, the two adjacent buffer baffles 53 are rotated relative to each other at a certain angle, for example, 30°, 45°, or 60°, so that the corresponding buffer holes 531 of the two are staggered at a certain angle (the corresponding buffer holes 531 of the two are partially overlapped), or completely staggered (the buffer holes 531 of the two correspond to each other's physical parts). In this way, when the fluid flows through the buffer holes 531, the flow path will be changed, thereby reducing turbulence and disturbance, effectively dispersing the fluid pressure, and improving the buffering effect on the fluid.

[0089] For example Figure 10 As shown, in some embodiments, the buffer springs include a first buffer spring 541 supported in the center of the buffer diaphragm 53 and a second buffer spring 542 supported at the edge of the buffer diaphragm 53. The diameter of the second buffer spring 542 generally matches the outer diameter of the buffer diaphragm 53. This allows the pressure changes generated by the fluid flow to act simultaneously on the first buffer spring 541 and the second buffer spring 542, improving the internal stability of the diaphragm buffer device, reducing vibration and noise, and more effectively absorbing the kinetic energy of the fluid. To facilitate the installation of the first buffer spring 541, a spring column for housing the first buffer spring 541 or a spring cylinder for embedding the first buffer spring 541 is typically provided in the center of the buffer diaphragm 53. To facilitate the installation of the second buffer spring 542, a retaining structure is typically provided at the edge of the buffer diaphragm 53 to retain the end of the second buffer spring 542 in the groove formed by the retaining structure and the buffer diaphragm 53.

[0090] 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 of the embodiments, practical applications, or technological advancements, or to enable others skilled in the art to understand the embodiments disclosed herein, as compared to commercially available technology.

[0091] 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 subcombination, 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 embodiment would not function without those features.

[0092] All publications, patents, and patent applications mentioned in this document are hereby incorporated by reference in their entirety as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated by reference. Additionally, the citation or identification of any reference in this document should not be construed as an admission that such reference is prior art to the present invention. With respect to the use of section headings, the section headings should not be construed as necessarily limiting.

Claims

1. A multi-stage buffered flexible stop valve comprising a valve body (1) and a valve core (2); The valve body (1) has a valve cavity (11) and a valve inlet (12) and a valve outlet (13) respectively connected to the valve cavity (11); a valve seat (111) is provided in the valve cavity (11); The spool (2) is axially movably arranged in the valve cavity (11) and forms an opening and closing mechanism with the valve seat (111) capable of controlling the on-off of the valve inlet (12) and the valve outlet (13); characterized in that: The valve core (2) comprises an outer valve core (21), a middle valve core (22) and an inner valve core (23); The outer valve core (21) and the middle valve core (22) are nested and matched to form a core cavity (201); an outer core outflow hole (211) is provided on the side wall of the outer valve core (21); the outer core outflow hole (211) can move with the valve core (2) to a position connected to the valve outlet (13); when the valve core (2) is matched with the valve seat (111), the outer core outflow hole (211) is closed by the wall surface of the valve seat (111); The middle valve core (22) is provided with a valve core inlet hole (221) for connecting the valve inlet (12) and the core cavity (201); a middle core outlet hole (222) is provided on the side wall of the middle valve core (22); the middle core outlet hole (222) is connected to the outer core outlet hole (211), and the projection of the middle core outlet hole (222) along its direction is at least partially located on the hole wall of the outer core outlet hole (211); The inner valve core (23) is axially movably arranged in the core cavity (201), and an elastic component is arranged between the end of the inner valve core away from the valve core inlet hole (221) and the inner end wall of the core cavity (201); the inner valve core (23) has an inner core inlet channel (231) and an inner core outlet channel (232) that are connected to each other, the channel inlet of the inner core inlet channel (231) is connected to the core cavity (201), and the channel outlet of the inner core outlet channel (232) is connected to the center core outlet hole (222), and the projection of the channel outlet along its direction is at least partially located on the hole wall of the center core outlet hole (222).

2. The multi-stage buffer resilient stop valve according to claim 1, characterized in that: The outer core outflow holes (211) are at least three and are distributed in a ring array around the axis of the valve core (2); The number of the central core outflow holes (222) is greater than the number of the outer core outflow holes (211), and the holes are distributed in an annular array around the axis of the valve core (2); The number of channel outlets of the inner core outflow channel (232) is greater than the number of the middle core outflow holes (222), and the outlets are distributed in a ring array around the axis of the valve core (2).

3. The multi-stage buffer resilient stop valve according to claim 2, wherein: The inner core inlet channel (231) and the inner valve core (23) are kept coaxial; The inner core outflow channel (232) comprises a channel confluence cavity (2321) and an inner core outflow branch (2322) arranged along the radial direction of the inner valve core (23); The inner core inlet flow channel (231) comprises an inner core inlet flow communication section that is in communication with the channel confluence cavity (2321), and an inner core inlet flow energy dissipation groove (2311) located on the upper side of the channel confluence cavity (2321).

4. The multi-stage buffer resilient stop valve according to claim 1, characterized in that: The elastic component includes a main buffer spring (241) and a secondary buffer spring (242); The main buffer spring (241) and the inner valve core (23) are kept coaxial; There are at least three auxiliary buffer springs (242) distributed in an annular array around the main buffer spring (241).

5. The multi-stage buffer resilient stop valve according to any one of claims 1 to 4, characterized in that: The bottom of the outer valve core (21) is a valve core sealing part. The bottom surface of the valve core sealing part is a first valve core sealing surface (212) for sealingly mating with the annular table surface of the valve seat (111), and the outer peripheral surface of the valve core sealing part is a second valve core sealing surface (213) for sealingly mating with the wall surface of the valve seat (111). The valve core (2) further includes a sealing part self - recovery mechanism (25). The sealing part self - recovery mechanism (25) includes a receiving groove (251) and at least two self - recovery components arranged in the receiving groove (251). The receiving groove (251) is opened on the outer wall of the outer valve core (21), and is located above the valve core sealing part and below the outer core outflow hole (211). The self - recovery component includes a tooth box (252), a tooth box top cover (253) and a recovery tooth (254). The tooth box (252) and the tooth box top cover (253) are cooperatively connected and enclose a tooth - containing cavity (255). An exposed - tooth opening is formed at the bottom of the outer wall of the tooth - containing cavity (255). There are at least two recovery teeth (254), which are arranged in the tooth - containing cavity (255) with their sides in contact with each other. The recovery tooth (254) includes a tooth body (2541) and a repair part (2542) arranged at the bottom edge of the tooth body (2541) and protruding outward to the exposed - tooth opening. The second valve core sealing surface (213), the outer side surface of the tooth box top cover (253) and the outer side surfaces of the respective repair parts (2542) are coplanar and smoothly transition and connect. The tooth box top cover (253) is provided with a box - cover groove communicating with the tooth - containing cavity (255). The top surface of the receiving groove (251), the wall surface of the box - cover groove and the top surfaces of the respective recovery teeth (254) together enclose a self - recovery flow - containing cavity (256). For any two adjacent self - recovery components, their self - recovery flow - containing cavities (256) communicate with each other. A self - recovery inlet channel (257) is opened in the outer valve core (21) to communicate at least one self - recovery flow - containing cavity (256) with the outer core outflow hole (211).

6. The multi-stage buffer resilient stop valve according to claim 5, characterized in that: The receiving groove (251) is an arc - shaped groove or a circular groove opened along the circumferential direction of the outer valve core (21). There are at least two self - recovery inlet channels (257), which are distributed in an annular array around the axis of the valve core (2).

7. The multi-stage buffer resilient stop valve according to claim 5, characterized in that: It further includes a valve cover (3) and a valve rod (4). The valve cavity (11) penetrates upward to the top surface of the valve body (1) and forms a valve top opening (112) on the top surface of the valve body (1). The valve cover (3) is sealingly arranged at the valve top opening (112). The valve rod (4) is vertically arranged through the valve cover (3), and its lower end extends into the valve cavity (11) and is connected to the valve core (2).

8. The multi-stage buffer resilient stop valve according to claim 7, wherein: The valve cavity (11) has an ellipsoidal chamber (113) above the valve seat (111). The cross - sectional dimension of the ellipsoidal chamber (113) is larger than the cross - sectional dimensions of other parts of the valve cavity (11). The valve outlet (13) communicates with the ellipsoidal chamber (113).

9. The multi-stage buffer resilient stop valve according to claim 7, wherein: It further includes a partition buffer device (5) provided at the valve inlet (12) and / or the valve outlet (13), and the partition buffer device (5) includes a first buffer housing (51) of the buffer device, a second buffer housing (52) of the buffer device, and a buffer partition (53); The first buffer housing (51) of the buffer device and the second buffer housing (52) of the buffer device are cooperatively connected and enclose to form a fluid buffer chamber; The first buffer housing (51) of the buffer device is provided with a buffer inlet (511) communicating with the fluid buffer chamber, and the second buffer housing (52) of the buffer device is provided with a buffer outlet (521) communicating with the fluid buffer chamber; At least two buffer holes (531) evenly distributed are formed in the buffer partition (53); the buffer partition (53) is at least two and is arranged at intervals in the fluid buffer chamber; the buffer partition (53) is arranged perpendicular to the flow direction of the fluid buffer chamber, and a buffer spring is arranged between any two adjacent buffer partitions (53).

10. The multi-stage buffer resilient stop valve according to claim 9, characterized in that: For any two adjacent buffer partitions (53), the buffer holes (531) thereof are staggeredly distributed; The buffer spring includes a first buffer spring (541) supported at the central part of the buffer partition (53) and a second buffer spring (542) supported at the edge part of the buffer partition (53).

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