Limiting device of rotary valve

Abstract

The support assembly comprises a support and positioning discs symmetrically fixed to the left side and the right side of the support, inner limiting holes are formed in the edges of the positioning discs, and adjusting screw holes are formed in the centers of the positioning discs. The valve rod assembly comprises a valve rod and a positioning block, the positioning block is fixedly connected with the valve rod through a flat key, and the positioning block is axially limited through an elastic check ring for a shaft; the lock disc adjusting mechanism comprises a lock disc center shaft and a lock disc, and threads are arranged outside the lock disc center shaft; the pin shaft locking mechanism comprises a plurality of outer limiting holes which are formed in the lock disc and matched with the inner limiting holes, and pin shafts which are arranged between the outer limiting holes and the inner limiting holes in a matched mode. Through double locking, thread fine adjustment and modular design, the technical bottlenecks that a traditional limiting device is low in reliability and cannot be adjusted are overcome, breakthrough is achieved in the aspects of accurate control, high-pressure vibration resistance and maintenance convenience, and the device is suitable for the fields with high requirements such as energy and chemical engineering.

Description

Technical Field

[0001] This utility model relates to a limiting device for a rotary valve. Background Technology

[0002] With societal development and the rapid advancements in modern large-scale machinery, petroleum, chemical, new energy, and nuclear industries, the requirements for valve stroke limits are becoming increasingly stringent. Existing limit devices for rotary valves mostly rely on the internal limit function of the actuator or a single mechanical structure (such as a fixed stop or limit bolt), which has the following drawbacks:

[0003] 1. Insufficient reliability: The single limit method is prone to failure under high pressure or high vibration conditions, resulting in valve overshoot or positioning deviation;

[0004] 2. Not adjustable: Traditional welded limit devices cannot be adjusted according to valve wear, resulting in high maintenance costs. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a limiting device for a rotary valve, which has a compact structure, precise and adjustable limiting, and solves the problems of low reliability and difficult maintenance in traditional technologies.

[0006] The technical solution adopted in this utility model is:

[0007] A limiting device for a rotary valve, comprising:

[0008] Support assembly: The support assembly includes a support and positioning plates symmetrically fixed on the left and right sides of the support. The positioning plates have inner limiting holes on their edges and adjustment screw holes in their centers.

[0009] Valve stem assembly: The valve stem assembly includes a valve stem and a positioning block. The positioning block is fixedly connected to the valve stem by a flat key, and the positioning block is axially limited by a shaft elastic retaining ring.

[0010] Two locking disc adjustment mechanisms that match the positioning disc: The locking disc adjustment mechanism includes a locking disc central shaft and a locking disc fixed to the outer end of the locking disc central shaft. The locking disc central shaft is provided with threads, and the locking disc central shaft matches the adjustment screw hole in the center of the positioning disc; Pin locking mechanism: The pin locking mechanism includes multiple outer limit holes that are opened on the locking disc and match the inner limit holes, and a pin that is matched and disposed between the outer limit holes and the inner limit holes.

[0011] Preferably, the outer end of the pin is fixed with a positioning platform, and the inner end is provided with a positioning hole along the radial direction, and a padlock is matched in the positioning hole.

[0012] Preferably, the two locking disc adjustment mechanisms are used to adjust the limiting positions of the positioning blocks on the left and right sides, respectively.

[0013] Preferably, there are multiple inner limiting holes, which are evenly distributed circumferentially on the positioning plate.

[0014] This invention overcomes the technical bottlenecks of low reliability and non-adjustability of traditional limit devices through double locking, threaded fine adjustment and modular design. It achieves breakthroughs in precise control, resistance to high-pressure vibration and convenient maintenance, and is suitable for high-requirement fields such as energy and chemical industries.

[0015] The beneficial effects of this utility model are:

[0016] 1. Dual-locking design with multiple protection mechanisms:

[0017] Traditional valve limit devices mostly rely on internal actuator limits, which pose a risk of single-point failure. The innovation of this device lies in combining mechanical limiting and physical locking for dual protection:

[0018] Mechanical limit: The central shaft of the locking disc is locked by inserting a pin into the inner and outer limit holes to ensure the mechanical stability of the limit action;

[0019] Physical locking: After the pin is inserted, it is fixed by a padlock, forming an irreversible rigid limit;

[0020] The dual-locking design significantly improves the reliability of the device, especially under high pressure and high vibration conditions, effectively preventing limit offset caused by mechanical wear or impact.

[0021] 2. Adjustable threaded fit structure:

[0022] The adjustment accuracy of traditional limit devices is limited by the actuator stroke or the coarse adjustment method of the fixing bolt. This device adopts the following innovative structure to achieve precise adjustment:

[0023] Threaded pair fit: The external thread of the locking disc center shaft fits with the internal thread of the positioning disc adjustment screw hole, and the millimeter-level fine adjustment of the limit position can be achieved by rotating the locking disc to meet the stringent stroke requirements of high-pressure valves;

[0024] Symmetrical adjustment: Two independent locking disc adjustment mechanisms correspond to the fully open and fully closed positions of the valve, respectively. By independently adjusting the locking discs on both sides, the valve stroke endpoint can be accurately calibrated, avoiding the problem of uneven load caused by unilateral adjustment.

[0025] This structure not only improves the limit accuracy, but also supports dynamic calibration after long-term use, extending the overall life of the valve.

[0026] 3. Modular and quick-assembly / disassembly design:

[0027] Addressing the pain points of traditional devices, such as complex installation and poor adaptability, this device optimizes maintenance efficiency through the following innovations:

[0028] Pre-integrated design of welding positioning plate and bracket: The positioning plate is directly welded to both ends of the bracket to form a standardized installation interface that is compatible with a variety of valve models;

[0029] Tool-free disassembly: The plug-in design of the pin and padlock allows for quick unlocking without special tools, facilitating on-site maintenance or emergency repairs;

[0030] Modular design significantly lowers the installation threshold, while reducing downtime and improving the operating efficiency of industrial pipelines. Attached Figure Description

[0031] Figure 1 This is a side view of the present invention.

[0032] Figure 2 for Figure 1 Schematic diagram of the MM cross-sectional structure;

[0033] Figure 3 This is a schematic diagram of the exploded structure of this utility model. Detailed Implementation

[0034] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0041] like Figure 1-3 As shown, a limiting device for a rotary valve includes:

[0042] Support assembly: The support assembly includes a support 1 and positioning discs 2 symmetrically fixed on the left and right sides of the support 1. The positioning discs 2 have inner limiting holes 3 on their edges and adjustment screw holes 4 in their centers.

[0043] Valve stem assembly: The valve stem assembly includes a valve stem 5 and a positioning block 6. The positioning block 6 is fixedly connected to the valve stem 5 by a flat key 7, and the positioning block 6 is axially limited by a shaft elastic retaining ring 8.

[0044] Two locking disc adjustment mechanisms that match the positioning disc 2: The locking disc adjustment mechanism includes a locking disc central shaft 9 and a locking disc 10 fixed to the outer end of the locking disc central shaft 9. The inner end of the locking disc central shaft 9 extends into the bracket 1 and is the limiting position of the positioning block 6. The locking disc central shaft 9 is provided with threads on the outside. The locking disc central shaft 9 matches the adjustment screw hole 4 in the center of the positioning disc 2.

[0045] Pin locking mechanism: The pin locking mechanism includes multiple outer limiting holes 11 that are matched with the inner limiting holes 3 on the locking disc 10, and a pin 12 that is matched and disposed between the outer limiting holes 11 and the inner limiting holes 3.

[0046] The outer end of the pin 12 is fixed with a positioning platform 13, and the inner end is provided with a positioning hole 14 along the radial direction. A padlock 15 is matched in the positioning hole 14.

[0047] The two locking disc adjustment mechanisms are used to adjust the limiting positions of the positioning block 6 on the left and right sides, respectively.

[0048] There are multiple inner limiting holes 3, which are evenly distributed circumferentially on the positioning disk 2.

[0049] This utility model achieves precise control and reliable limiting of the rotary valve stroke through the coordinated operation of a dual locking mechanism and a fine-tunable structure. The following is a step-by-step analysis of its core working principle:

[0050] 1. Component coordination and motion constraints:

[0051] Valve stem assembly and positioning block:

[0052] The valve stem drives the positioning block to rotate synchronously. The rotation range of the positioning block is determined by the position of the locking disc adjustment mechanism on both sides. The positioning block is fixed to the valve stem by a flat key to ensure synchronous rotation. The elastic retaining ring of the shaft provides axial limit to prevent the positioning block from sliding along the valve stem.

[0053] Locking disc adjustment mechanism:

[0054] The central shafts of the two locking discs are engaged with the adjusting screw holes of the positioning disc through threads. When the locking disc is rotated, the threaded pair of the central shaft drives the locking disc to move axially (left-hand or right-hand), thereby changing the position of the inner end of the central shaft. By independently adjusting the two locking discs, the limit positions of the valve fully open and fully closed can be set respectively, achieving millimeter-level fine adjustment.

[0055] 2. Dual locking mechanism:

[0056] Mechanical limit:

[0057] The locking disc is equipped with multiple outer limit holes, and multiple inner limit holes are evenly distributed on the edge of the positioning disc. When the locking disc is adjusted to the correct position, the corresponding inner and outer limit holes are aligned and the pin is inserted to form a rigid mechanical limit. At this time, when the positioning block touches the inner end of the central shaft of the locking disc, it cannot continue to rotate, thus preventing the valve from over-rushing.

[0058] Physical locking:

[0059] The inner end of the pin has a positioning hole. After the padlock is inserted, the pin cannot be accidentally dislodged. The irreversible locking feature of the padlock enhances safety and is especially suitable for high-pressure and high-vibration environments, preventing the pin from loosening due to impact or vibration.

[0060] 3. Dynamic adjustment and maintenance:

[0061] Threaded pair fine adjustment:

[0062] If wear occurs after long-term use of the valve, the limit position can be adjusted by rotating the central shaft of the locking disc. The threaded fit structure (such as M12 fine thread) allows for precise adjustment, compensating for wear and extending the valve's lifespan.

[0063] Modular design:

[0064] The bracket and positioning plate are pre-welded as a whole, which is compatible with a variety of valve models. The pin and padlock adopt a plug-in design, which can be quickly disassembled and assembled without tools, simplifying the maintenance process and reducing downtime.

[0065] 3. Failure-resistant design:

[0066] Symmetrical limit:

[0067] The independent locking disc adjustment mechanism on both the left and right sides avoids the problem of uneven load caused by uneven force on one side, thus improving structural stability;

[0068] Multi-hole selection:

[0069] The evenly distributed inner limit holes on the circumference of the positioning plate provide multiple angle limit options to adapt to different working conditions.

[0070] In specific adjustments, the axial position of the center shaft of the left and right lock discs can be adjusted as needed, thereby adjusting the extreme positions of the positioning block on the left and right sides. The specific adjustment method is as follows: rotate the lock disc to the target position, then select the appropriate inner limit hole and outer limit hole, insert the pin, and finally install the padlock in the positioning hole.

[0071] Finally, it should be noted that the above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A stop device for a rotary valve, characterized by Includes: a support assembly: the support assembly includes a support (1) and positioning discs (2) symmetrically fixed on the left and right sides of the support (1), the positioning discs (2) having inner limiting holes (3) on their edges and adjusting screw holes (4) in their centers; a valve stem assembly: the valve stem assembly includes a valve stem (5) and a positioning block (6), the positioning block (6) being fixedly connected to the valve stem (5) by a flat key (7), and the positioning block (6) being axially limited by an elastic retaining ring (8); two locking discs matching the positioning discs (2) Sectional mechanism: The locking disc adjustment mechanism includes a locking disc central shaft (9) and a locking disc (10) fixed at the outer end of the locking disc central shaft (9). The locking disc central shaft (9) is provided with threads, and the locking disc central shaft (9) matches the adjustment screw hole (4) at the center of the positioning disc (2). Pin locking mechanism: The pin locking mechanism includes multiple outer limit holes (11) opened on the locking disc (10) that match the inner limit hole (3), and a pin (12) matched between the outer limit hole (11) and the inner limit hole (3).

2. A rotary valve position-limiting device according to claim 1, wherein The outer end of the pin (12) is fixed with a positioning platform (13), and the inner end is provided with a positioning hole (14) along the radial direction. A padlock (15) is matched in the positioning hole (14).

3. A rotary valve position-limiting device according to claim 1, wherein The two locking disc adjustment mechanisms are used to adjust the positioning block (6) on the left and right sides respectively.

4. The rotary valve position-limiting device of claim 1, wherein There are multiple inner limiting holes (3), which are evenly distributed around the circumference of the positioning plate (2).

Images