Adjustable limiting mechanism suitable for butterfly valve

Abstract

The invention relates to an adjustable limiting mechanism suitable for a butterfly valve. The connecting bracket comprises a first mounting end face, a second mounting end face and a bracket internal area, and the first mounting end face and the second mounting end face are oppositely arranged; the execution mechanism is installed on the first installation end face and used for providing torque, and the output end of the execution mechanism is provided with a connecting shaft stretching into the inner area of the support; the valve body is installed on the second installation end face, the valve body comprises a valve shaft which is coaxially connected with the connecting shaft and used for driving the valve plate to be opened and closed, and the valve shaft extends into the inner area of the support; the limiting sleeve is arranged outside the connecting shaft in a sleeving manner, and a limiting part extends outwards along the peripheral end of the limiting sleeve; the limiting adjusting piece is connected to the connecting support in a telescopic mode, and one end of the limiting adjusting piece stretches into the inner area of the support according to the preset stretching-in amount. Over-position closing caused by abnormity of an executing mechanism, a severe field environment or aging of parts is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to an adjustable limiting mechanism suitable for a butterfly valve. Background Art

[0002] In recent years, with the continuous improvement of industrial automation and process control levels, butterfly valves have been widely used in various industrial pipeline systems due to their advantages of small size, light weight, flexible opening and closing, etc. compared with gate valves and stop valves of the same specifications. In particular, three-eccentric and four-eccentric butterfly valves have excellent sealing performance and operational reliability in high-pressure and high-temperature environments.

[0003] However, most existing butterfly valves rely on the mechanical limit (such as limit switch) of the actuator to achieve the limit. Once the actuator fails or fails due to harsh site conditions or structural aging, the valve plate will exceed the normal closing angle (the valve plate will be over-closed), causing damage to the sealing ring and ultimately causing valve leakage. Summary of the invention

[0004] To this end, the present invention provides an adjustable limit mechanism suitable for a butterfly valve, which can timely block the rotation of the valve plate when it rotates to a predetermined closing position, thereby preventing over-closing caused by abnormal actuators, harsh on-site environments or aging of components.

[0005] In order to solve the above technical problems, the present invention provides an adjustable limit mechanism suitable for a butterfly valve, comprising: A connecting bracket, comprising a first mounting end surface, a second mounting end surface and a bracket internal area, wherein the first mounting end surface and the second mounting end surface are arranged opposite to each other; An actuator, mounted on the first mounting end surface, for providing torque, wherein an output end of the actuator is provided with a connecting shaft extending into an inner area of ​​the bracket; A valve body, mounted on the second mounting end surface, the valve body comprising a valve shaft coaxially connected to the connecting shaft and used to drive the valve plate to open and close, the valve shaft extending into the inner area of ​​the bracket; A limiting sleeve, which is sleeved outside the connecting shaft and has a limiting portion extending outwardly from an outer peripheral end of the limiting sleeve; A limit adjustment member, wherein the limit adjustment member is telescopically connected to the connecting bracket, and one end thereof extends into the inner area of ​​the bracket with a predetermined extension amount, wherein when the valve shaft is driven to rotate by the connecting shaft, the limit portion can come into contact with the limit adjustment member, and the closing position of the valve plate can be adjusted by adjusting the predetermined extension amount of the limit adjustment member.

[0006] In one embodiment of the present invention, the actuator and the valve body are respectively connected to the connecting bracket via a bolt assembly.

[0007] In one embodiment of the present invention, at least one first chamfered plane is provided on the outer periphery of the connecting shaft, a second chamfered plane is provided at the inner hole of the limiting sleeve corresponding to the position of the first chamfered plane, the limiting sleeve is provided with a radial through hole, and a fastener abutting against the first chamfered plane is connected in the radial through hole.

[0008] In one embodiment of the present invention, two first cut planes are arranged in parallel.

[0009] In one embodiment of the present invention, the radial through hole is a threaded hole, and the fastener includes a first set screw, a locking washer, and a second set screw that are sequentially abutted against each other, and the first set screw abuts against the first chamfered surface.

[0010] In one embodiment of the present invention, the limiting portion includes a limiting plane, and the limiting adjustment member includes a spherical surface capable of abutting against the limiting plane.

[0011] In one embodiment of the present invention, the limit adjustment member includes a limit bolt threadedly connected to the side wall of the connecting bracket, and a locking nut threadedly connected to the limit bolt and abutting against the side wall of the connecting bracket, and the head of the limit bolt is constructed as the spherical surface.

[0012] In one embodiment of the present invention, a mounting hole for the valve shaft to extend into is provided in the middle of the connecting shaft.

[0013] In one embodiment of the present invention, the connecting shaft and the valve shaft are connected via a key.

[0014] The above technical solution of the present invention has the following advantages compared with the prior art: The adjustable limit mechanism for butterfly valves described in the present invention can block the rotation of the valve plate when it rotates to the predetermined closing position by arranging a limit sleeve and a limit part on the outer sleeve of the connecting shaft, and then cooperating with the limit adjustment member, so as to prevent the valve plate from over-closing due to abnormal actuator, bad on-site environment or aging of components, and ensure that the valve body sealing ring does not leak due to excessive wear or damage. The limit adjustment member can flexibly adjust the final closing position of the valve plate according to the actual working conditions, so that the valve can obtain the best sealing effect while avoiding operation jamming or sealing damage caused by over-positioning.

[0015] The head of the limiting bolt in the limiting adjustment member of the present invention is configured as a spherical surface, so that when it contacts the plane of the limiting portion, stress concentration and local wear caused by point contact are avoided, the service life is extended, and the error caused by installation deviation is compensated.

[0016] The present invention provides the first and second chamfered planes and radial through holes between the connecting shaft and the limiting sleeve and is equipped with fasteners (consisting of a first set screw, an anti-loosening gasket and a second set screw), which effectively prevents the loosening problem caused by frequent valve movements and ensures the long-term reliability of the limiting mechanism.

[0017] The actuator and the valve body of the present invention are respectively fixed by bolt assemblies and connecting brackets, which is convenient for on-site assembly and later maintenance and replacement; at the same time, the connecting shaft and the valve shaft are connected by keys, making disassembly and alignment more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the adjustable limiting mechanism applicable to a butterfly valve of the present invention.

[0020] Figure 2 yes Figure 1 Cross-sectional view along the AA direction.

[0021] Description of the Figures in the Specification: 1. Connecting bracket; 11. First mounting end surface; 12. Second mounting end surface; 13. Internal area of ​​bracket; 14. Bolt assembly; 2. Actuator; 21. Connecting shaft; 211. First cutting plane; 3. Valve body; 31. Valve shaft; 4. Limiting sleeve; 41. Limiting portion; 411. Limiting plane; 42. Second cutting plane; 43. Fastener; 431. First set screw; 432. Anti-loosening washer; 433. Second set screw; 5. Limit adjustment part; 51. Limit bolt; 52. Lock nut; 53. Spherical surface. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0023] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0024] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0026] Reference Figure 1 As shown, an adjustable limit mechanism suitable for a butterfly valve of the present invention comprises: A connecting bracket 1, comprising a first mounting end surface 11, a second mounting end surface 12 and a bracket inner region 13, wherein the first mounting end surface 11 and the second mounting end surface 12 are arranged opposite to each other; An actuator 2 is mounted on the first mounting end surface 11 and is used to provide torque. The output end of the actuator 2 is provided with a connecting shaft 21 extending into the inner area 13 of the bracket; A valve body 3 is mounted on the second mounting end surface 12, wherein the valve body 3 comprises a valve shaft 31 which is coaxially connected to the connecting shaft 21 and is used to drive the valve plate to open and close, and the valve shaft 31 extends into the inner area 13 of the bracket; A limiting sleeve 4 is sleeved outside the connecting shaft 21, and a limiting portion 41 is extended outwardly along the outer peripheral end of the limiting sleeve 4; The limit adjustment member 5 is telescopically connected to the connecting bracket 1, and one end thereof extends into the inner area 13 of the bracket with a predetermined extension amount, wherein when the valve shaft 31 is driven to rotate by the connecting shaft 21, the limit portion 41 can come into contact with the limit adjustment member 5, and the closing position of the valve plate can be adjusted by adjusting the predetermined extension amount of the limit adjustment member 5.

[0027] Through the above arrangement, by arranging the limit sleeve 4 and the limit part 41 on the outer surface of the connecting shaft 21, and then cooperating with the limit adjustment member 5, the valve plate can be timely blocked from rotating when it rotates to the predetermined closing position, thereby preventing the over-closing situation caused by abnormal actuator 2, bad on-site environment or aging of components, and ensuring that the valve body sealing ring does not leak due to excessive wear or damage. The limit adjustment member 5 can flexibly adjust the final closing position of the valve plate according to the actual working conditions, so that the valve can obtain the best sealing effect while avoiding operation jamming or sealing damage caused by over-positioning.

[0028] In one embodiment, the actuator 2 and the valve body 3 are respectively connected to the connection bracket 1 through a bolt assembly 14. The connection bracket 1 adopts an integral design, is made of high-strength alloy material, and has a firm structure.

[0029] In one embodiment, referring to Figure 2 As shown, at least one first chamfered surface 211 is provided on the outer periphery of the connecting shaft 21, a second chamfered surface 42 is provided at the position of the inner hole of the limiting sleeve 4 corresponding to the first chamfered surface 211, and the limiting sleeve 4 is provided with a radial through hole, and a fastener 43 is connected in the radial through hole to abut against the first chamfered surface 211. Exemplarily, the first chamfered surface 211 is provided with two parallel arrangements.

[0030] Specifically, the radial through hole is a threaded hole, and the fastener 43 includes a first set screw 431, a locking washer 432, and a second set screw 433 that are sequentially disposed against each other, and the first set screw 431 abuts against the first cut surface 211. This reduces the possibility of loosening between the connecting shaft 21 and the limiting sleeve 4 due to frequent valve movements, thereby reducing the limit failure.

[0031] Reference Figure 2 As shown, the limit portion 41 includes a limit plane 411, and the limit adjustment member 5 includes a spherical surface 53 that can abut against the limit plane 411. It should be noted that the limit portion 41 and the limit sleeve 4 are an integrated structure, which can be integrally cast with the limit sleeve 4 body or formed by machining to ensure the stability and durability of the structure. The limit portion 41 is made of high-strength alloy material to withstand frequent mechanical impacts. In addition, its surface can be hardened to enhance wear resistance.

[0032] In one embodiment, the limit adjustment member 5 includes a limit bolt 51 threadedly connected to the side wall of the connecting bracket 1, and a locking nut 52 threadedly connected to the limit bolt 51 and abutting against the side wall of the connecting bracket 1, and the head of the limit bolt 51 is constructed as the spherical surface 53. The valve plate closing position is adjusted by adjusting the screw-in length of the limit bolt 51. The valve plate closing angle can be precisely controlled by adjusting the predetermined extension amount to meet the operating requirements under special working conditions such as high pressure and high temperature, and further improve the system stability and sealing performance. The locking nut 52 is locked to prevent the valve from being stuck due to the valve plate being over-closed. In addition, when adjusting the optimal closing position of the valve plate, there will be a deviation in the angle. By setting the spherical surface 53 to contact, stress concentration caused by point contact is avoided, thereby improving the service life.

[0033] In one embodiment, a mounting hole for the valve shaft 31 to extend into is provided in the middle of the connecting shaft 21. Specifically, the connecting shaft 21 and the valve shaft 31 are connected by a key. In other implementations, the connecting shaft 21 and the valve shaft 31 may also be connected by welding.

[0034] It should be noted that the connecting shaft 21 is relatively short, and its length is much smaller than the length of the valve shaft 31 (e.g., 1:5). A shorter connecting shaft 21 can effectively reduce the risk of bending and torsional deformation during torque transmission, and shortening its length can reduce the force area and bending moment, thereby ensuring a more rigid and stable transmission and avoiding mechanical vibration and errors caused by an excessively long shaft length.

[0035] When working, the actuator 2 outputs torque, which is transmitted to the valve shaft 31 through the connecting shaft 21, driving the valve plate to open and close. During the rotation of the valve plate, when the preset angle (i.e., the optimal closed position) is reached, the limit portion 41 on the connecting shaft 21 contacts the limit adjustment member 5 (the spherical surface 53 part), forming a mechanical block to prevent the valve plate from continuing to rotate, thereby achieving precise closure. Since the first and second chamfered surfaces 42 are provided on the outside of the connecting shaft 21, the various components are firmly connected through the fasteners 43 in the radial through hole (including the first set screw 431, the anti-loosening gasket 432 and the second set screw 433), which can effectively prevent loosening even when the valve is frequently operated, and ensure the stability of the limit action. During actual installation and debugging, the limit bolt 51 can be screwed in or out to adjust its predetermined extension amount, and the valve plate can be accurately controlled to reach the optimal closed position; after adjustment, it is reinforced by the locking nut 52 to ensure that the limit position will not change unexpectedly during long-term operation.

[0036] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An adjustable limit mechanism suitable for a butterfly valve, characterized in that: include: A connecting bracket (1), comprising a first mounting end surface (11), a second mounting end surface (12), and a bracket internal area (13), wherein the first mounting end surface (11) and the second mounting end surface (12) are arranged opposite to each other; An actuator (2) is mounted on the first mounting end surface (11) and is used to provide torque, wherein the output end of the actuator (2) is provided with a connecting shaft (21) extending into the inner area (13) of the bracket; A valve body (3) is mounted on the second mounting end surface (12), the valve body (3) comprising a valve shaft (31) coaxially connected to the connecting shaft (21) and used for driving the valve plate to open and close, the valve shaft (31) extending into the inner area (13) of the bracket; A limiting sleeve (4) is sleeved outside the connecting shaft (21), and a limiting portion (41) extends outwardly along the outer peripheral end of the limiting sleeve (4); A limit adjustment member (5), wherein the limit adjustment member (5) is telescopically connected to the connecting bracket (1), and one end thereof extends into the inner area (13) of the bracket by a predetermined extension amount, wherein when the valve shaft (31) is driven to rotate by the connecting shaft (21), the limit portion (41) can come into contact with the limit adjustment member (5), and the closing position of the valve plate can be adjusted by adjusting the predetermined extension amount of the limit adjustment member (5).

2. The adjustable limit mechanism for a butterfly valve according to claim 1, characterized in that: The actuator (2) and the valve body (3) are respectively connected to the connecting bracket (1) via a bolt assembly (14).

3. The adjustable limit mechanism for a butterfly valve according to claim 1, characterized in that: The outer periphery of the connecting shaft (21) is provided with at least one first chamfered plane (211), the inner hole of the limiting sleeve (4) is provided with a second chamfered plane (42) at a position corresponding to the first chamfered plane (211), the limiting sleeve (4) is provided with a radial through hole, and a fastener (43) abutting against the first chamfered plane (211) is connected to the radial through hole.

4. The adjustable limit mechanism for a butterfly valve according to claim 3, characterized in that: The first cut planes (211) are provided with two parallel arranged ones.

5. The adjustable limit mechanism for a butterfly valve according to claim 3, characterized in that: The radial through hole is a threaded hole, and the fastener (43) comprises a first set screw (431), a locking washer (432), and a second set screw (433) which are arranged in sequence to abut against each other, and the first set screw (431) abuts against the first cut surface (211).

6. The adjustable limit mechanism for a butterfly valve according to claim 1, characterized in that: The limiting portion (41) comprises a limiting plane (411), and the limiting adjustment member (5) comprises a spherical surface (53) capable of abutting against the limiting plane (411).

7. The adjustable limit mechanism for a butterfly valve according to claim 6, characterized in that: The limit adjustment member (5) comprises a limit bolt (51) threadedly connected to the side wall of the connecting bracket (1), and a locking nut (52) threadedly connected to the limit bolt (51) and abutting against the side wall of the connecting bracket (1), and the head of the limit bolt (51) is configured as the spherical surface (53).

8. The adjustable limit mechanism for a butterfly valve according to claim 1, characterized in that: A mounting hole for the valve shaft (31) to extend into is provided in the middle of the connecting shaft (21).

9. The adjustable limit mechanism for a butterfly valve according to claim 8, characterized in that: The connecting shaft (21) and the valve shaft (31) are connected via a key.

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