Quick closing gate valve

Abstract

The application relates to the technical field of gate valves, and provides a quick-closing gate valve which comprises a valve body assembly, a valve plate space and a valve rod space are arranged in the valve body assembly, an inner wall of the valve rod space is provided with a first inner thread and a second inner thread, the first inner thread and the second inner thread are arranged at intervals, a valve plate is movably arranged in the valve plate space, a valve rod is rotatably arranged in the valve rod space along the axis of the valve rod and is connected to the valve plate, the valve rod is provided with a first threaded section and a second threaded section, the first threaded section and the second threaded section are arranged at intervals, the first threaded section is located on the side of the second threaded section close to the valve plate, and the pitch of the first threaded section is greater than that of the second threaded section. The quick-closing gate valve can solve the technical problem that the valve plate is damaged after long-term work due to the impact of the valve plate on the valve seat and the valve body during the process of quickly cutting off the fluid.

Description

Technical Field

[0001] This application relates to the field of gate valve technology, and in particular to a quick-closing gate valve. Background Technology

[0002] A gate valve is a type of shut-off valve that controls the flow of media in a pipeline by vertically raising and lowering a gate. Its core function is to allow fluid to pass through without resistance when fully open and to completely cut off the flow of media when fully closed. It is a fully open or fully closed valve and is not suitable for flow regulation or throttling operations.

[0003] Quick-closing gate valves, in specific industrial applications, are typically designed to rapidly shut off fluid flow in emergencies to prevent escalation of accidents or equipment damage. During the rapid fluid shut-off process, the valve plate impacts the valve seat and body, which, over time, can lead to deformation of the sealing surface, cracks, or even breakage of the valve plate. For example, Chinese patent application CN201911229543.X discloses a technique that uses a storage spring to compress and store energy, propelling a lifting plate downwards to close the valve plate; this technique suffers from the aforementioned problems. Utility Model Content

[0004] This application provides a quick-closing gate valve, which can improve the technical problem in related technologies where the valve plate will impact the valve seat and valve body during the process of quickly cutting off fluid, which may cause damage to the valve plate after long-term operation.

[0005] Firstly, a quick-closing gate valve includes:

[0006] A valve body assembly, wherein a valve plate space and a valve stem space are provided on the valve body assembly; the inner wall of the moving space is provided with a first internal thread and a second internal thread, the first internal thread and the second internal thread being spaced apart;

[0007] A valve plate, which is movably disposed within the valve plate space;

[0008] A valve stem is provided in the moving space, which is rotatable about its own axis and movable along its own axis direction, and is connected to the valve plate; the valve stem is provided with a first threaded section and a second threaded section, which are spaced apart, the first threaded section is located on the side of the second threaded section closer to the valve plate, and the pitch of the first threaded section is greater than the pitch of the second threaded section.

[0009] When the valve stem rotates and drives the valve plate to close, the first threaded segment separates from the first internal thread, and the second threaded segment engages with the second internal thread. As the second threaded segment engages with the second internal thread, it moves along its own axis, and the valve plate and the sealing chamber of the valve body eventually come into complete contact.

[0010] The technical solution described above in this application embodiment has at least the following technical effects: By segmenting the engagement of the first threaded section and the fine-pitch second threaded section on the valve stem with the first internal thread and the second internal thread, the valve plate can quickly descend within the valve plate space to promptly cut off the flow. After the valve plate initially enters the sealing cavity below the valve body, it is then finely adjusted using the fine pitch of the second threaded section to prevent damage to the lower end of the valve plate as it rapidly descends with the handwheel rotating. During the upward movement of the valve plate as the handwheel rotates, the preload of the spring eliminates gaps and prevents idling, achieving automatic switching between precision sealing and rapid stroke during the opening and closing of the valve plate.

[0011] In some embodiments, a valve body assembly is included, the valve body assembly having a valve plate space and a valve stem space; the inner wall of the valve stem space is provided with a first internal thread and a second internal thread, the first internal thread and the second internal thread being spaced apart; the valve plate is movably disposed within the valve plate space; the valve stem is rotatable about its own axis and movable along its own axis direction within the valve stem space, and is rotatably connected to the valve plate; the valve stem is provided with a first thread segment and a second thread segment, the first thread segment and the second thread segment being spaced apart, the first thread segment being located on the side of the second thread segment closer to the valve plate, and the pitch of the first thread segment being greater than the pitch of the second thread segment;

[0012] In the process of the valve stem rotating and driving the valve plate to close, the first threaded segment engages with the first internal thread first, and the second threaded segment engages with the second internal thread later. In some embodiments, the valve body assembly has a fluid passage, and the valve plate space includes a sealing space and a placement space. The sealing space is formed on the inner wall of the fluid passage, and the placement space is located between the sealing space and the valve plate space, and communicates with the sealing space and the valve plate space.

[0013] The quick-closing gate valve has a closed state and an open state; in the closed state, the valve plate is sealed within the sealing space to cut off the fluid passage; in the open state, the valve plate is accommodated within the placement space to open the fluid passage.

[0014] In the open state, the axial distance between the bottom end of the valve plate and the top end of the inner wall of the sealed space is a first distance, and the axial distance between the bottom end of the valve plate and the bottom end of the inner wall of the sealed space is a second distance; the length of the first threaded segment is greater than or equal to the first distance and less than the second distance; the length of the second threaded segment is greater than or equal to the difference between the second distance and the length of the first threaded segment.

[0015] In some embodiments, the valve body assembly includes: a valve body having the valve plate space and a communicating space communicating with the valve plate space; a first connecting portion connected to the valve body and having the first connecting space; and a second connecting portion connected to the side of the first connecting portion away from the valve body and having the second connecting space.

[0016] The connecting space, the first connecting space, and the second connecting space are connected to form the valve stem space; the inner wall of the first connecting space is provided with the first internal thread, and the inner wall of the second connecting space is provided with the second internal thread.

[0017] In some embodiments, the first connection portion includes: a first support portion connected to the valve body; a first nut connected to the first support portion, wherein the internal space of the first nut is the first connection space, and the inner wall of the first nut is provided with the first internal thread.

[0018] In some embodiments, the first support portion includes: a first support frame connected to the valve body; a first connecting lug connected to the first support frame; and fasteners;

[0019] The outer wall of the first nut is provided with a second connecting lug, and the second connecting lug is connected to the first connecting lug by the fastener.

[0020] In some embodiments, the second connection portion includes: a second support member connected to the side of the first connection portion away from the valve body; and a second nut member connected to the second support member, wherein the internal space of the second nut member is the second connection space, and the inner wall of the second nut member is provided with the second internal thread.

[0021] In some embodiments, the quick-closing gate valve further includes a handwheel, which is fixedly connected to the valve stem and is used to drive the valve stem to rotate about the axis of the valve stem. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A front view of a quick-closing valve provided in an embodiment of this application;

[0024] Figure 2 An enlarged schematic diagram of the quick-closing valve connector provided in an embodiment of this application;

[0025] Figure 3 A schematic diagram of the valve plate being fully open in the quick-closing valve provided in the embodiment of this application;

[0026] Figure 4 A schematic diagram showing the bottom end of the valve plate starting to enter the bottom cavity of the valve body in the quick-closing valve provided in the embodiment of this application;

[0027] Figure 5 This is a schematic diagram of a quick-closing valve with the valve plate fully closed, provided in an embodiment of this application.

[0028] The following are the labeling elements in the figure:

[0029] 1. Valve stem; 2. Handwheel; 3. Spring; 101. Second threaded section; 4. Second nut; 401. Second nut support; 102. First threaded section; 5. First nut; 501. Connecting lug; 502. Fastener; 6. Valve body assembly; 7. Valve plate; Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0031] A gate valve is a type of shut-off valve that controls the flow of media in a pipeline by vertically raising and lowering a gate. Its core function is to allow fluid to pass through without resistance when fully open and to completely cut off the flow of media when fully closed. It is a fully open or fully closed valve and is not suitable for flow regulation or throttling operations.

[0032] Quick-closing gate valves in related technologies are typically designed for specific industrial applications to rapidly shut off fluid flow in emergencies to prevent accidents from escalating or equipment damage. However, the rapid shut-off process in quick-closing gate valves causes the valve core to impact the valve seat at extremely high speeds, leading to deformation, cracks, or even breakage of the sealing surface. For example, Chinese patent document CN201911229543.X discloses a method that uses a storage spring 3 to compress and store force, propelling a lifting plate downwards, thereby causing the valve plate 7 to move downwards to close the valve; this method suffers from the aforementioned problem.

[0033] Based on this, in order to improve the problem of valve plate damage caused by rapid closing in related technologies, the embodiments of this application provide the following solution.

[0034] Please refer to the following: Figure 1 and Figure 2 This application provides a quick-closing gate valve, including a valve body assembly 6, a valve plate 7, and a valve stem 1. The valve body assembly 6 is the main component that carries the internal structure of the valve as a whole. It has a space inside for accommodating the valve plate 7 and the valve stem 1 and is the structural basis of the entire gate valve.

[0035] The valve plate 7 space is a space within the valve body assembly 6 specifically designed to accommodate and guide the movement of the valve plate 7, ensuring that the valve plate 7 remains stably aligned during opening or closing.

[0036] The valve stem 1 space is a space for accommodating the valve stem 1. The inner wall of this space is provided with two spaced internal threads for the valve stem 1 to engage when moving up and down.

[0037] The first thread section 102 and the second thread section 101 refer to two threaded areas with different pitches on the valve stem 1: the first thread section 102 is closer to the valve plate 7 and has a larger pitch, which is used to achieve rapid movement; the second thread section 101 has a smaller pitch and is used for precision control.

[0038] The first internal thread and the second internal thread refer to the threaded structures respectively set at different positions in the space of the valve stem 1, which cooperate with the corresponding threaded segments on the valve stem 1 to form a segmented drive mechanism.

[0039] It is understandable that when the operator rotates valve stem 1, the first threaded section 102 on valve stem 1 engages with the first internal thread, causing valve stem 1 to move rapidly downwards in a short time, driving valve plate 7 to quickly approach the sealing position at the bottom of the valve body, achieving a quick closing action. The subsequent stage of rotational drive involves slow and precise engagement. As valve stem 1 continues to rotate until the first threaded section 102 disengages from the first internal thread, the second threaded section 101 begins to engage with the second internal thread. At this point, valve plate 7 is close to the sealing position, entering a slow, precise advancement stage. Because the smaller thread pitch results in a more delicate advance, it prevents valve plate 7 from violently impacting the sealing surface, thus effectively protecting the structure and improving sealing accuracy. Different thread pitches are used to switch the speed during the closing process; the rotational action automatically triggers the sequential engagement of the two threaded sections.

[0040] In some embodiments, please refer to the following: Figures 3 to 5 The valve body assembly 6 has a fluid passage, and the valve plate 7 space includes a sealing space and a placement space. The sealing space is opened on the inner wall of the fluid passage, and the placement space is located between the sealing space and the valve plate 7 space and is connected to the sealing space and the valve plate 7 space.

[0041] The quick-closing gate valve has a closed state and an open state; in the closed state, the valve plate 7 is sealed in the sealing space to cut off the fluid passage; in the open state, the valve plate 7 is accommodated in the placement space to open the fluid passage.

[0042] In the open state, the axial distance between the bottom end of the valve plate 7 and the top end of the inner wall of the sealing space is the first distance, and the axial distance between the bottom end of the valve plate 7 and the bottom end of the inner wall of the sealing space is the second distance; the length of the first threaded segment 102 is greater than or equal to the first distance and less than the second distance; the length of the second threaded segment 101 is greater than or equal to the difference between the second distance and the length of the first threaded segment 102.

[0043] The fluid passage refers to the main channel inside the valve body used for the flow of the medium. When the valve is in the open state, the medium flows freely along this channel.

[0044] The sealing space is located on the inner wall of the fluid channel, where the valve plate 7 enters and fits tightly when closed. This space is used to achieve complete isolation and sealing of the fluid by the valve plate 7.

[0045] The placement space is a buffer space located between the sealing space and the valve plate 7 space, used to accommodate the retracted valve plate 7 when the valve is opened, so as to prevent it from obstructing the flow of fluid.

[0046] Closed and Open States: In the closed state, valve plate 7 is inserted into the sealing space, and the fluid is completely blocked. In the open state, valve plate 7 is completely removed from the sealing space and placed in the placement space, allowing the fluid to flow freely.

[0047] The first distance and the second distance, where the first distance refers to the distance between the bottom end of the valve plate 7 and the top end of the sealing space, indicating the starting point of contact with the sealing surface. The second distance refers to the distance between the bottom end of the valve plate 7 and the bottom end of the sealing space, indicating the position when the sealing surface is fully compressed. They constitute the effective stroke of the valve plate 7 during the pressing process within the sealing space.

[0048] It is understood that the valve plate 7 retracts completely from the sealing space and is located in the placement space, without interfering with the flow of fluid. The bottom end of the valve plate 7 and the top and bottom ends of the sealing space respectively constitute two reference positions. At this time, the design length of the threaded section on the valve stem 1 is closely matched with these two distances, laying the structural foundation for the subsequent closing action. After the valve stem 1 rotates, it pushes the valve plate 7 downward, firstly quickly entering the sealing space. When the valve plate 7 moves from the placement space to the top of the sealing space, it is mainly advanced by the first threaded section 102. When it continues to advance to the sealing surface, it switches to the second threaded section 101 for advancement, achieving precise compression sealing.

[0049] In some embodiments, please refer to the following: Figures 3 to 5 The valve body assembly 6 includes: a valve body having a valve plate 7 space and a communicating space communicating with the valve plate 7 space; a first connecting portion having a first connecting space connected to the valve body; and a second connecting portion having a second connecting space connected to the side of the first connecting portion away from the valve body.

[0050] The connecting space, the first connecting space, and the second connecting space are connected to form the valve stem 1 space; the inner wall of the first connecting space is provided with a first internal thread, and the inner wall of the second connecting space is provided with a second internal thread.

[0051] It can be understood that the valve body refers to the main structural part of the gate valve, which is directly connected to the fluid system and is the core part for realizing the entire valve function. In this structure, it includes the space of the valve plate 7 and the communication space, and is the starting basis for the movement of the valve plate 7 and the valve stem 1.

[0052] The connecting space is a transitional space located inside the valve body, used to connect the valve plate 7 space with the subsequent connecting parts in terms of structure and function, forming a continuous movement path of the valve stem 1.

[0053] The first connecting part refers to the structural unit connected after the valve body and forming the first connecting space. Its inner wall is provided with a first internal thread for cooperating with the first threaded section 102 of the valve stem 1 for driving.

[0054] The second connecting part refers to the part located after the first connecting part, which is structurally connected to the far end of the first connecting part to form a second connecting space. Its inner wall is provided with a second internal thread for mating with the second threaded section 101 of the valve stem 1.

[0055] The first connecting space and the second connecting space are cavities corresponding to the interior of the connecting structure. They respectively serve to support the first and second internal threads and, as part of the segmented meshing channel, constitute a continuous channel for the entire valve stem space.

[0056] It is understood that the valve body constitutes the main control unit of the valve, and has a valve plate space 7 and a communicating space. The first connecting part is installed at the rear of the valve body, and its internal space constitutes the first connecting space and carries the first internal thread. The second connecting part is installed after the first connecting part, and its internal cavity has a second internal thread. The communicating space, the first connecting space, and the second connecting space are structurally connected in series to form a complete valve stem 1 space; the valve stem 1 can rotate and move axially in this space from beginning to end, and engages with the two threaded sections at different stages. In the initial stage of the descent of the valve stem 1, its first threaded section 102 engages with the first internal thread for rapid drive; as the valve stem 1 descends further, its second threaded section 101 engages with the second internal thread for slow advancement and precise sealing;

[0057] In some embodiments, please refer to the following: Figures 3 to 5 The first connecting part includes: a first supporting part connected to the valve body; and five first nuts connected to the first supporting part. The internal space of the five first nuts is the first connecting space, and the inner wall of the five first nuts is provided with a first internal thread.

[0058] The first support part refers to the load-bearing structure set between the valve body and the first connecting part, which is used to securely connect the five first nuts and provide them with a mounting base or fixing structure.

[0059] The first nut (5 pieces) is a standard or custom-made nut-shaped component with a first internal thread. Its internal space is the first connection space, used to mate with the first threaded section 102 of the valve stem 1 to complete the driving action of the valve plate 7 in the rapid closing process. The valve body is first connected to the first support part by screwing or welding; then the first nut (5 pieces) is installed on the first support part; the first nut (5 pieces) has a first connection space inside, forming a precision meshing channel with a first internal thread; the first threaded section 102 of the valve stem 1 is inserted and mates with this internal thread to achieve axial drive. This structure realizes a stable, replaceable, and highly independent internal thread connection interface.

[0060] In some embodiments, please refer to the following: Figures 3 to 5 The first support portion includes: a first support frame connected to the valve body; a first connecting lug 501 connected to the first support frame; and a fastener 502.

[0061] The outer wall of the first nut 5 piece is provided with a second connecting ear 501, and the second connecting ear 501 is connected to the first connecting ear 501 by a fastener 502.

[0062] As can be understood, the first support frame refers to the main load-bearing component connected to the valve body, used to support and secure the entire first connection section. Its function is to construct a stable and reliable frame, providing a rigid foundation for subsequent components.

[0063] The first connecting lug 501 is an ear-shaped structure set on the first support frame, used to connect the second connecting lug 501 of the nut component. It has the functions of structural mating and fastening hole positioning.

[0064] The second connecting ear 501 is a structural protrusion provided on the outer wall of the first nut 5, usually an annular protrusion or a plate-shaped ear, which is provided opposite to the first connecting ear 501 and is connected by a fastener 502.

[0065] Fastener 502 refers to connecting elements such as screws, bolts, studs, and clips, used to fix the second connecting ear 501 and the first connecting ear 501 together to form a detachable or replaceable mechanical connection.

[0066] In some embodiments, please refer to the following: Figures 3 to 5 The second connecting part includes: a second support member connected to the side of the first connecting part away from the valve body; and four second nuts connected to the second support member. The internal space of the four second nuts is the second connecting space, and the inner wall of the four second nuts is provided with a second internal thread.

[0067] The second connection part refers to the component module installed on the side of the first connection part away from the valve body, which constitutes the rear section of the valve stem 1 space and provides structural support for the second threaded engagement.

[0068] The second support component is a structural part connected after the first connecting part, used to install and support the four second nuts, and undertakes the functions of positioning, connection and support.

[0069] The second nut 4 is similar to the first nut 5. It is a structural component with a second connection space. Its inner wall is machined with a second internal thread, which is used to cooperate with the second threaded section 101 of the valve stem 1 to realize the functions of precision propulsion and sealing control.

[0070] It is understood that the second support is installed at the end of the first connecting part by welding or screwing; the four second nuts are fixed to the second support, forming the subsequent movement path of the valve stem 1; the four second nuts have internal threads, forming a second connecting space; when the valve stem 1 rotates, its second threaded section 101 achieves low-speed, precise meshing transmission within this space. After the valve stem 1 completes rapid closure at the front, it enters the second connecting space; the second internal thread, with a small pitch, meshes with the second threaded section 101, causing the valve plate 7 to advance slowly, achieving pressure stabilization and sealing surface contact; the setting of the second support ensures structural strength and positional accuracy, preventing thread failure due to load offset.

[0071] In some embodiments, please refer to the following: Figures 3 to 5 The quick-closing gate valve also includes a handwheel 2, which is fixedly connected to the valve stem 1 and is used to drive the valve stem 1 to rotate around the axis of the valve stem 1.

[0072] Among them, the handwheel 2 refers to a manually operated circular rotating device, usually made of metal or plastic, with anti-slip spokes or edges, which drives the valve stem 1 to move by manual rotation, and is used to control the rotation behavior of the valve stem 1.

[0073] It is understandable that the user manually rotates the handwheel 2; the handwheel 2 is rigidly connected to the valve stem 1 and rotates synchronously; the valve stem 1 engages with the internal thread when rotating; thereby realizing the axial movement of the valve stem 1, pushing the valve plate 7 up and down to realize opening and closing.

[0074] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A quick-closing gate valve, characterized in that, include: A valve body assembly, wherein a valve plate space and a valve stem space are provided on the valve body assembly; the inner wall of the valve stem space is provided with a first internal thread and a second internal thread, the first internal thread and the second internal thread being spaced apart; A valve plate, which is movably disposed within the valve plate space; A valve stem is rotatable about its own axis and movable along its own axis in the valve stem space and is rotatably connected to the valve plate; the valve stem is provided with a first threaded section and a second threaded section, the first threaded section and the second threaded section are spaced apart, the first threaded section is located on the side of the second threaded section closer to the valve plate, and the pitch of the first threaded section is greater than the pitch of the second threaded section. During the process of the valve stem rotating and driving the valve plate to close, the first threaded segment engages with the first internal thread first, and the second threaded segment engages with the second internal thread later.

2. The gate valve as described in claim 1, characterized in that: The valve body assembly has a fluid passage, and the valve plate space includes a sealing space and a placement space. The sealing space is formed on the inner wall of the fluid passage, and the placement space is located between the sealing space and the valve plate space, and is connected to the sealing space and the valve plate space. The quick-closing gate valve has a closed state and an open state; in the closed state, the valve plate is sealed within the sealing space to cut off the fluid passage; In the open state, the valve plate is accommodated within the placement space to open the fluid passage; In the open state, the axial distance between the bottom end of the valve plate and the top end of the inner wall of the sealed space is a first distance, and the axial distance between the bottom end of the valve plate and the bottom end of the inner wall of the sealed space is a second distance; the length of the first threaded segment is greater than or equal to the first distance and less than the second distance; the length of the second threaded segment is greater than or equal to the difference between the second distance and the length of the first threaded segment.

3. The gate valve as described in claim 1, characterized in that: The valve body assembly includes: The valve body has the valve plate space and a connecting space connected to the valve plate space; The first connection part is connected to the valve body and has a first connection space. The second connection part is connected to the side of the first connection part away from the valve body, and has a second connection space. The connecting space, the first connecting space, and the second connecting space are connected to form the valve stem space; the inner wall of the first connecting space is provided with the first internal thread, and the inner wall of the second connecting space is provided with the second internal thread.

4. The gate valve as described in claim 3, characterized in that: The first connection portion includes: The first support portion is connected to the valve body; The first nut is connected to the first support portion. The internal space of the first nut is the first connection space, and the inner wall of the first nut is provided with the first internal thread.

5. The gate valve as described in claim 4, characterized in that: The first support portion includes: The first support frame is connected to the valve body; The first connecting ear is connected to the first support frame; fastener; The outer wall of the first nut is provided with a second connecting lug, and the second connecting lug is connected to the first connecting lug by the fastener.

6. The gate valve as described in claim 3, characterized in that: The second connection portion includes: The second support member is connected to the side of the first connection portion away from the valve body; The second nut is connected to the second support member. The internal space of the second nut is the second connecting space, and the inner wall of the second nut is provided with the second internal thread.

7. The gate valve as described in any one of claims 1 to 6, characterized in that: The quick-closing gate valve also includes a handwheel, which is fixedly connected to the valve stem and is used to drive the valve stem to rotate around the axis of the valve stem.

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