Adjustable limiting mechanism suitable for butterfly valve

Abstract

The utility model relates to an adjustable limiting mechanism suitable for a butterfly valve. The connecting support comprises a first mounting end face, a second mounting end face and a support 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 utility model relates to valve technical field especially be applicable to butterfly valve's adjustable limiting mechanism. BACKGROUND

[0002] In recent years, with the continuous improvement of industrial automation and process control level, compared with the same specification of gate valve and stop valve, the butterfly valve is widely used in various industrial pipeline systems due to its small size, light weight, flexible opening and closing and other advantages. Especially the three eccentric and four eccentric butterfly valve has excellent sealing performance and operation reliability in high pressure and high temperature environment.

[0003] However, most of the existing butterfly valves rely on the mechanical limiting (such as limiting switch) of the matched actuator to realize limiting. Once the actuator fails or fails due to poor site conditions or structural aging, it will cause the valve plate to exceed the normal closing angle (valve plate closing over position), thereby causing the sealing ring to be damaged, and ultimately leading to valve leakage. SUMMARY

[0004] Therefore, the utility model provides a kind of adjustable limiting mechanism applicable to butterfly valve, it is timely blocked rotation when valve plate rotates to predetermined closing position, to prevent the situation of closing over position caused by abnormal actuator, poor site environment or component aging.

[0005] To solve the above technical problems, the utility model provides an adjustable limiting mechanism applicable to butterfly valve, comprising:

[0006] The connecting bracket includes a first mounting end face, a second mounting end face and a bracket internal area, wherein the first mounting end face and the second mounting end face are oppositely arranged;

[0007] The actuator is installed on the first mounting end face and is used to provide torque. The output end of the actuator is provided with a connecting shaft extending into the bracket internal area;

[0008] The valve body is installed on the second mounting end face. The valve body includes a valve shaft coaxially connected with the connecting shaft and used to drive the opening and closing of the valve plate. The valve shaft extends into the bracket internal area;

[0009] The limiting sleeve is sleeved outside the connecting shaft and extends outward along the outer peripheral end of the limiting sleeve to a limiting part;

[0010] The limiting adjusting part is telescopically connected to the connecting bracket and extends into the bracket internal area by a predetermined extension amount at one end. When the valve shaft is driven to rotate by the connecting shaft, the limiting part can contact the limiting adjusting part. By adjusting the predetermined extension amount of the limiting adjusting part, the closing position of the valve plate can be adjusted.

[0011] In an embodiment of the utility model, the actuating mechanism and the valve body are connected with the connecting support through bolt assembly respectively.

[0012] In an embodiment of the utility model, the connecting shaft outer periphery is provided with at least one first flat, the limit sleeve inner hole is provided with the second flat corresponding the first flat position, the limit sleeve is provided with radial through -hole, the fastener is connected with the first flat in the radial through -hole.

[0013] In an embodiment of the utility model, the first flat is provided with two parallel settings.

[0014] In an embodiment of the utility model, the radial through -hole is screw hole, the fastener includes the first locking screw, lock washer and second locking screw that are sequentially abutted, and the first locking screw abuts with the first flat.

[0015] In an embodiment of the utility model, the limit part includes limit flat, and the limit adjusting piece includes the spherical surface that can abut with the limit flat.

[0016] In an embodiment of the utility model, the limit adjusting piece includes the limit bolt that is screwed on the connecting support side wall and the lock nut that is screwed on the limit bolt and abuts with the connecting support side wall, and the head of the limit bolt is structured as the spherical surface.

[0017] In an embodiment of the utility model, the connecting shaft middle part is provided with the mounting hole that the valve shaft extends into.

[0018] In an embodiment of the utility model, the connecting shaft and the valve shaft are connected through key.

[0019] The above technical scheme of the utility model has the following advantages compared with prior art:

[0020] The adjustable limit mechanism suitable for butterfly valve of the utility model, through the limit sleeve and limit part of the connecting shaft, and then cooperating with the limit adjusting piece, can timely block rotation when the valve plate rotates to the predetermined closing position, so as to prevent the over-closing position caused by abnormal actuating mechanism, severe field environment or component aging, and ensure that the valve body sealing ring does not leak due to excessive wear or damage. The limit adjusting piece can flexibly adjust the final position of the valve plate according to the actual working condition, so that the valve can obtain the best sealing effect, and avoid operation jamming or sealing damage caused by over-positioning.

[0021] The head of the limiting bolt in the limiting adjusting part is constructed as a spherical surface, so that stress concentration and local wear caused by point contact are avoided when the limiting bolt contacts with the plane of the limiting part, and the service life is prolonged, and errors caused by installation deviation are compensated.

[0022] The first and second flat surfaces and the radial through hole are arranged between the connecting shaft and the limiting sleeve and are equipped with fasteners (which are composed of a first locking screw, a lock washer and a second locking screw), so that loosening problems caused by frequent operation of the valve are effectively prevented, and long-term reliability of the limiting mechanism is ensured.

[0023] The actuator and the valve body are fixed by bolt assemblies and connecting brackets respectively, so that on-site assembly and later maintenance and replacement are facilitated; meanwhile, the connecting shaft and the valve shaft are connected by a key, so that disassembly and centering correction are more convenient and faster. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the content of the utility model more easily understood clearly, the utility model is further described in detail below according to the specific embodiments of the utility model and in combination with the drawings.

[0025] Figure 1 It is the overall structure schematic view of the adjustable limiting mechanism suitable for the butterfly valve of the utility model.

[0026] Figure 2 It is Figure 1 The sectional view along the A-A direction.

[0027] DESCRIPTION OF DRAWINGS

[0028] 1, connecting bracket; 11, first mounting end face; 12, second mounting end face; 13, bracket internal area; 14, bolt assembly;

[0029] 2, actuator; 21, connecting shaft; 211, first flat surface;

[0030] 3, valve body; 31, valve shaft;

[0031] 4, limiting sleeve; 41, limiting part; 411, limiting plane; 42, second flat surface; 43, fastener; 431, first locking screw; 432, lock washer; 433, second locking screw;

[0032] 5, limiting adjusting part; 51, limiting bolt; 52, locking nut; 53, spherical surface. DETAILED DESCRIPTION

[0033] The utility model is further described below in combination with the drawings and specific embodiments, so that those skilled in the art can better understand the utility model and implement it, but the embodiments are not as the limitation of the utility model.

[0034] In the utility model, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical scheme of the utility model, and is not indicative or suggestive of the technical features indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0035] In the utility model, the meaning of "several" is one or more, and the meaning of "multiple" is two or more. "More than", "less than", "exceeding" and the like are understood as not including the number. "Above", "below", "within" and the like are understood as including the number. In the description of the utility model, if "first" and "second" are described, they are only used for distinguishing technical features for the purpose, and cannot be understood as indicative or suggestive of relative importance or implicitly indicating the number of the technical features indicated or implicitly indicating the sequence of the technical features indicated.

[0036] In the utility model, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood. For example, it can be directly connected, or indirectly connected through an intermediate medium; it can be fixedly connected, or detachably connected, or integrally formed; it can be mechanically connected, or electrically connected or capable of communicating with each other; it can be the communication or interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0037] Referring to Figure 1 The utility model discloses a kind of adjustable limiting mechanism suitable for butterfly valve, comprising:

[0038] Connecting support 1, including first installation end surface 11, second installation end surface 12 and support internal area 13, wherein, the first installation end surface 11 and the second installation end surface 12 are oppositely arranged;

[0039] Actuator 2 is installed on the first installation end surface 11, for providing torque, and the output end of the actuator 2 is provided with connecting shaft 21 that extends into the support internal area 13;

[0040] Valve body 3 is installed on the second installation end surface 12, and the valve body 3 includes valve shaft 31 coaxially connected with the connecting shaft 21 and used for driving valve plate opening and closing, and the valve shaft 31 extends into the support internal area 13;

[0041] Limiting sleeve 4 is sleeved on the connecting shaft 21, and limiting part 41 extends outward along the outer circumferential end of the limiting sleeve 4;

[0042] A limiting adjusting member 5 is telescopically connected to the connecting bracket 1 and extends into the internal area 13 of the bracket by a predetermined extension amount, wherein the limiting portion 41 can be in contact with the limiting adjusting member 5 when the valve shaft 31 is driven to rotate by the connecting shaft 21, and the closing position of the valve plate can be adjusted by adjusting the predetermined extension amount of the limiting adjusting member 5.

[0043] Through the above arrangement, the rotation of the valve plate is blocked in time when the valve plate rotates to the predetermined closing position by sleeving the limiting sleeve 4 and the limiting portion 41 on the connecting shaft 21 and cooperating with the limiting adjusting member 5, thereby preventing the over-closing caused by the abnormality of the actuator 2, the harsh field environment or the aging of the components, and ensuring that the valve body sealing ring does not leak due to excessive wear or damage. The limiting adjusting 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.

[0044] In one embodiment, the actuator 2 and the valve body 3 are connected to the connecting bracket 1 by bolt assemblies 14, respectively. The connecting bracket 1 is designed as a whole, and is made of high-strength alloy material, which is firm in structure.

[0045] In one embodiment, referring to Figure 2 As shown, the outer periphery of the connecting shaft 21 is provided with at least one first flat surface 211, the inner hole of the limiting sleeve 4 is provided with a second flat surface 42 corresponding to the position of the first flat surface 211, and the limiting sleeve 4 is provided with a radial through hole in which a fastener 43 abutting against the first flat surface 211 is connected. Exemplarily, the first flat surface 211 is provided with two parallel flat surfaces.

[0046] Specifically, the radial through hole is a threaded hole, and the fastener 43 includes a first locking screw 431, a lock washer 432 and a second locking screw 433 which are arranged in sequence and abut against each other, and the first locking screw 431 abuts against the first flat surface 211. This reduces the loosening between the connecting shaft 21 and the limiting sleeve 4 caused by frequent operation of the valve, which causes the limiting failure.

[0047] Referring to Figure 2 As shown, the limiting portion 41 includes a limiting flat surface 411, and the limiting adjusting member 5 includes a spherical surface 53 which can abut against the limiting flat surface 411. It should be noted that the limiting portion 41 and the limiting sleeve 4 are of an integral structure, which can be integrally cast or formed by machining with the body of the limiting sleeve 4 to ensure the stability and durability of the structure. The limiting portion 41 is made of high-strength alloy material to withstand frequent mechanical impact. In addition, the surface thereof can be subjected to hardening treatment to enhance the wear resistance.

[0048] In one embodiment, the position-limiting adjusting member 5 comprises a position-limiting bolt 51 screwed to the side wall of the connecting bracket 1, and a locking nut 52 screwed to the position-limiting bolt 51 and abutting against the side wall of the connecting bracket 1, the head of the position-limiting bolt 51 is configured as the spherical surface 53. By adjusting the length of the position-limiting bolt 51 screwed in, the valve plate closing position adjustment is achieved, the valve plate closing angle can be precisely controlled by adjusting the predetermined extension amount, meeting the operation requirements under special working conditions such as high pressure and high temperature, and further improving the system stability and sealing performance. By locking the locking nut 52, the valve jam caused by the valve plate closing too much is prevented. In addition, when adjusting the optimal closing position of the valve plate, there will be an angle deviation, by setting the spherical surface 53 in contact, the stress concentration caused by point contact is avoided, and the service life is improved.

[0049] In one embodiment, the middle part of the connecting shaft 21 is provided with a mounting hole for the valve shaft 31 to extend into. 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 can also be connected by welding.

[0050] It should be noted that the connecting shaft 21 is relatively short, and its length is much smaller than that of the valve shaft 31 (such as 1:5). The shorter connecting shaft 21 can effectively reduce the risk of bending and torsional deformation during torque transmission, and shortening its length can reduce the stress area and bending moment, thereby ensuring more rigid and stable transmission, and avoiding mechanical vibration and errors caused by too long shaft length.

[0051] In operation, the actuator 2 outputs torque, which is transmitted to the valve shaft 31 through the connecting shaft 21 to drive the valve plate to open and close. During the rotation of the valve plate, when the preset angle (i.e. the optimal closing position) is reached, the position-limiting part 41 on the connecting shaft 21 comes into contact with the position-limiting adjusting member 5 (the spherical surface 53 part), forming a mechanical barrier to prevent the valve plate from continuing to rotate, thereby achieving precise closing. Since the first and second flat surfaces 42 are provided outside the connecting shaft 21, the components are firmly connected through the radial through hole fastener 43 (including the first locking screw 431, the lock washer 432 and the second locking screw 433), which can effectively prevent loosening even under frequent valve operation, ensuring the stability of the position-limiting action. During actual installation and debugging, the predetermined extension amount can be adjusted by screwing in or out the position-limiting bolt 51 to accurately control the valve plate to reach the optimal closing position; after adjustment, the locking nut 52 is tightened to ensure that the position-limiting position does not change accidentally during long-term operation.

[0052] Finally, it should be explained that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. An adjustable stop mechanism for a butterfly valve, comprising: The utility model relates to a valve drive mechanism, including: Connecting support (1) including first installation end face (11), second installation end face (12) and support internal area (13), wherein, first installation end face (11) and second installation end face (12) are opposite and set up, Actuator (2) is installed on first installation end face (11), is used to provide torque, and the output of actuator (2) is provided with the connecting shaft (21) that protrudes into the support internal area (13), Valve body (3) is installed on second installation end face (12), and valve body (3) includes the valve shaft (31) that is coaxially connected with connecting shaft (21) and is used to drive valve plate open and close, and valve shaft (31) protrudes into the support internal area (13), Limiting sleeve (4) is sleeved on the outer of connecting shaft (21), and limiting portion (41) is extended outward along the limiting sleeve (4) outer circumferential end, Limiting adjusting part (5) is telescopically connected to connecting support (1), and one end protrudes into the support internal area (13) with predetermined protruding amount, wherein, when valve shaft (31) is driven to rotate through connecting shaft (21), limiting portion (41) can contact limiting adjusting part (5), and the closing position of valve plate is adjusted by adjusting the predetermined protruding amount of limiting adjusting part (5).

2. The adjustable stop mechanism for a butterfly valve according to claim 1, wherein Actuator (2) and valve body (3) are connected with connecting support (1) through bolt assembly (14) respectively.

3. The adjustable stop mechanism for a butterfly valve of claim 1, wherein, The outer periphery of connecting shaft (21) is provided with at least one first flat surface (211), the inner hole of limiting sleeve (4) is provided with second flat surface (42) corresponding to the position of first flat surface (211), limiting sleeve (4) is provided with radial through hole, and fastener (43) is connected in the radial through hole and abuts against first flat surface (211).

4. The adjustable stop mechanism for a butterfly valve of claim 3, wherein, The first flat surface (211) is provided with two parallel flat surfaces.

5. The adjustable stop mechanism for a butterfly valve of claim 3, wherein, The radial through hole is a threaded hole, the fastener (43) includes a first locking screw (431), a lock washer (432) and a second locking screw (433) arranged in sequence and abutting against each other, and the first locking screw (431) abuts against the first flat surface (211).

6. The adjustable stop mechanism for a butterfly valve of claim 1, wherein, The limiting portion (41) includes a limiting flat surface (411), and the limiting adjusting part (5) includes a spherical surface (53) capable of abutting against the limiting flat surface (411).

7. The adjustable stop mechanism for a butterfly valve of claim 6, wherein, The limiting adjusting part (5) includes a limiting screw (51) threadedly connected to the side wall of the connecting support (1), and a locking nut (52) threadedly connected to the limiting screw (51) and abutting against the side wall of the connecting support (1), and the head of the limiting screw (51) is configured as the spherical surface (53).

8. The adjustable stop mechanism for a butterfly valve of claim 1, wherein, The connecting shaft (21) is provided with a mounting hole in the middle for the valve shaft (31) to protrude into.

9. The adjustable stop mechanism for a butterfly valve of claim 8, wherein, The connecting shaft (21) and the valve shaft (31) are connected by a key.

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