Key groove and valve rod matching structure of center line-type butterfly valve

Abstract

The utility model relates to the technical field of center line-type butterfly valves, in particular to a key groove and valve rod matching structure of a center line-type butterfly valve, and adopts the technical scheme that the key groove and valve rod matching structure comprises a valve body, a worm and gear driving device is mounted on the valve body, an opening and closing piece is mounted in the valve body through a valve rod body, and the opening and closing piece comprises a butterfly plate and a positioning plate; a slotted hole and a reserved groove are formed in the butterfly plate; the positioning plate is detachably mounted at the reserved groove of the butterfly plate through a connecting bolt; a woodruff key is fixedly arranged on the positioning plate; the valve rod body penetrates through the slotted hole; a second key groove matched with the woodruff key is formed in the valve rod body. The valve rod body is in key connection with the opening and closing piece through matching of the woodruff key and the second key groove. The center line-type butterfly valve has the advantages of being convenient to disassemble and replace and low in maintenance cost, and the problems that a traditional center line-type butterfly valve is difficult to maintain and high in cost are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of centerline butterfly valves, in particular to a keyway and valve stem matching structure of a centerline butterfly valve. Background Art

[0002] As a common fluid control valve, the centerline butterfly valve is widely used in various industrial piping systems due to its compact structure, rapid opening and closing, and low flow resistance coefficient. Its core operating principle is to drive the valve disc (disc) within the valve body through the rotation of the valve stem, thereby opening or closing the pipeline.

[0003] In traditional structural designs, torque transmission between the valve stem and disc is crucial, typically achieved through a keyed connection. A common approach involves machining a keyway directly on the disc to mate with the valve stem, or integrating the transfer key and disc into a single piece through welding or integral casting. A corresponding keyway is machined into the valve stem, and a key is embedded within to ensure synchronous rotation.

[0004] However, existing centerline butterfly valve stem and disc keyway connections—whether machined directly onto the disc or welded or integrally molded—are either non-removable or difficult to disassemble. Once the keyway or transfer key becomes worn, deformed, or even damaged due to long-term use, overload, or corrosion, repair and replacement becomes extremely inconvenient. This often requires complete replacement of the disc or stem, or even disassembly of the entire valve. This results in high repair costs and long maintenance cycles, impacting equipment efficiency.

[0005] Therefore, there is an urgent need for a keyway and valve stem matching structure of a centerline butterfly valve to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a keyway and valve stem matching structure of a centerline butterfly valve, which has the advantages of convenient disassembly and replacement and low maintenance cost, and solves the problem that traditional centerline butterfly valves are difficult to maintain and costly.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a keyway and valve stem matching structure of a centerline butterfly valve, comprising a valve body, a worm gear drive device being mounted on the valve body, an opening and closing member being mounted in the valve body through a valve stem body, the opening and closing member comprising a butterfly plate and a positioning plate; a slotted hole and a reserved groove being formed on the butterfly plate; the positioning plate being detachably mounted on the reserved groove of the butterfly plate by connecting bolts; and a semicircular key being fixedly mounted on the positioning plate;

[0008] The valve stem body passes through the slotted hole; a second keyway matching the semicircular key is provided on the valve stem body; the valve stem body is connected to the opening and closing member via the matching key between the semicircular key and the second keyway.

[0009] Preferably, the valve body comprises an upper valve housing and a lower valve housing, the upper valve housing and the lower valve housing are fixedly connected by mounting bolts, and a valve seat is sandwiched between opposite sides of the upper valve housing and the lower valve housing.

[0010] The valve body is designed with a split upper and lower housing, which are bolted together with a valve seat sandwiched between the joints. This allows for easy assembly and disassembly of the valve body, facilitates replacement or maintenance of the valve seat, and significantly reduces overall replacement costs.

[0011] Preferably, the upper valve housing is provided with a mounting seat, which is used to install the worm gear drive device, and the mounting seat is provided with a first through hole for the top of the valve stem body to pass through.

[0012] The design incorporates a mounting block on the upper valve housing to secure the worm gear drive. A first through-hole is provided for the top of the valve stem to pass through. The mounting block provides stable support for the drive, while the first through-hole precisely guides the valve stem, ensuring coaxial transmission of drive force and minimizing the risk of eccentric wear.

[0013] Preferably, a second through hole is provided at the bottom inner side of the lower valve housing, and the second through hole is for the bottom of the valve stem body to pass through; a mounting groove is provided at the bottom of the lower valve housing, and a sealing bearing is installed in the mounting groove; the bottom of the valve stem body passes through the second through hole and extends into the mounting groove, and is connected to the sealing bearing; a positioning bolt is threadedly installed in the mounting groove, and the positioning bolt is used to position and tighten the sealing bearing.

[0014] The design features a second through-hole in the lower valve housing for the bottom of the valve stem to pass through. A sealed bearing is located within the mounting groove at the bottom. Once the valve stem is inserted, a retaining bolt secures the bearing. The sealed bearing reduces friction and leakage within the valve stem. The retaining bolt fine-tunes the bearing preload, preventing axial movement of the valve stem and extending the life of the seal.

[0015] Preferably, the valve seat is provided with a first reserved hole and a second reserved hole at the upper and lower ends respectively, the valve stem body passes through the first reserved hole and the second reserved hole and is rotatably connected to the valve seat, and the inner wall of the valve seat dynamically contacts the outer side of the butterfly plate.

[0016] The valve seat design features first and second through-holes, allowing the stem to rotate through the seat. The inner wall of the seat dynamically contacts the outer side of the disc. This allows the seat and stem to rotate independently, allowing for direct replacement of the seat if worn, eliminating the need for replacement of the disc or stem, thus reducing maintenance costs.

[0017] Preferably, a first screw hole is provided on the butterfly plate, and the first screw hole is for the connecting bolt to pass through; a second screw hole is provided on the positioning plate, and the second screw hole is for the connecting bolt to pass through.

[0018] The design features a first screw hole for the butterfly plate and a second screw hole for the locating plate, with the two fastened together via connecting bolts threaded through the holes. The modular design allows the locating plate and woodruff key to be independently removed and replaced. Bolted connections eliminate the maintenance difficulties associated with welding or integral machining, significantly reducing the cost of repairing keyway wear.

[0019] Preferably, a first keyway is provided at the upper end of the valve stem body, and the first keyway is used for transmission connection between the valve stem body and the worm gear drive device; a shaft shoulder is provided at the bottom of the valve stem body, and the shaft shoulder is rotatably installed in the sealing bearing; a third screw hole is opened on the valve stem body, and the third screw hole is used for threaded connection of the connecting bolt.

[0020] The valve stem incorporates a multifunctional design: a top keyway connects to the drive mechanism; a middle keyway accommodates a woodruff key; a bottom shoulder accommodates a sealed bearing; and a third threaded hole provides additional support for securing the connecting bolt. The first keyway ensures efficient power input; the second keyway and woodruff key form a replaceable torque transmission unit; the shoulder enhances bearing load stability; and the third threaded hole provides dual locking for the bolt, preventing the keyed connection from loosening and failing.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The utility model transmits torque through a detachable positioning plate and a semicircular key in conjunction with the second keyway of the valve stem body, and fixes the positioning plate to the reserved groove of the butterfly plate with connecting bolts. When the semicircular key or the second keyway is worn, it is only necessary to remove the connecting bolts to remove the positioning plate for replacement, without disassembling the valve body or replacing the butterfly plate and valve stem body, thereby greatly simplifying the maintenance process.

[0023] As a separate component, the positioning plate's manufacturing cost is significantly lower than replacing the entire butterfly plate or valve stem. This also reduces maintenance time and equipment downtime. The interference fit between the woodruff key and the secondary keyway ensures efficient torque transmission, while the connecting bolts extend through the positioning plate and base plate, creating a mechanical lock and preventing the key connection from loosening and failing.

[0024] In summary, this structure separates the semicircular key and locating plate from the butterfly plate and valve stem body through modular design, fundamentally solving the technical problem of difficult and costly maintenance of the keyway of traditional centerline butterfly valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0026] Figure 2 This is a schematic diagram of the exploded structure of the valve body of the utility model from one perspective;

[0027] Figure 3 This is a schematic diagram of the exploded structure of the valve body of the present invention from another perspective;

[0028] Figure 4 This is a schematic diagram of the valve seat structure of the utility model;

[0029] Figure 5 This is a schematic diagram of the opening and closing member structure of the utility model;

[0030] Figure 6 This is a schematic structural diagram of the valve stem body of the present utility model.

[0031] In the figure: 1. Valve body; 11. Upper valve housing; 111. Mounting seat; 112. First through hole; 113. Mounting bolt; 12. Lower valve housing; 121. Second through hole; 122. Positioning bolt; 123. Mounting groove; 124. Sealing bearing; 2. Worm gear drive; 3. Opening and closing member; 31. Butterfly plate; 311. Slotted hole; 312. First screw hole; 313. Reserved groove; 32. Positioning plate; 321. Semicircular key; 322. Second screw hole; 33. Connecting bolt; 4. Valve seat; 41. First reserved hole; 42. Second reserved hole; 5. Valve stem body; 51. First keyway; 52. Third screw hole; 53. Second keyway; 54. Shoulder. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1: Figures 1 to 6As shown, the utility model provides an embodiment: a keyway and valve stem matching structure of a centerline butterfly valve, comprising a valve body 1, a worm gear drive device 2 is installed on the valve body 1, the worm gear drive device 2 is fixedly mounted on the mounting seat 111 of the upper valve housing 11, and its output end is connected to the first keyway 51 at the upper end of the valve stem body 5 through a key for transmission; an opening and closing member 3 is installed in the valve body 1 through the valve stem body 5, and the opening and closing member 3 includes a butterfly plate 31 and a positioning plate 32; a slot 311 and a reserved slot 313 are provided on the butterfly plate 31; the positioning plate 32 is detachably mounted on the reserved slot 313 of the butterfly plate 31 by a connecting bolt 33; the connecting bolt 33 sequentially passes through the second screw hole 322 of the positioning plate 32 and the first screw hole 312 of the butterfly plate 31, and is screwed into the third screw hole 322 of the valve stem body 5 The screw hole 52 forms a triple lock; a semicircular key 321 is fixedly provided on the positioning plate 32, and the semicircular key 321 is interference fit with the positioning plate 32; the valve stem body 5 passes through the slot 311; a first keyway 51 is provided at the upper end of the valve stem body 5; a second keyway 53 matching the semicircular key 321 is provided on the valve stem body 5; the valve stem body 5 is connected to the opening and closing part 3 through the matching key of the semicircular key 321 and the second keyway 53; the valve body 1 includes an upper valve shell 11 and a lower valve shell 12, which are fixedly connected by mounting bolts 113 and clamped with a valve seat 4, and the valve seat 4 is provided with a first reserved hole 41 and a second reserved hole 42 for the valve stem body 5 to pass through; the bottom of the valve stem body 5 is rotatably mounted in the sealing bearing 124 of the lower valve shell 12 through the shaft shoulder 54, and is tightened and limited by the positioning bolt 122.

[0034] Specifically, a detachable positioning plate 32 is provided to cooperate with the second keyway 53 of the valve stem body 5 to transmit torque in cooperation with the semicircular key 321, and the positioning plate 32 is fixed to the reserved groove 313 of the butterfly plate 31 in combination with the connecting bolt 33. When the semicircular key 321 or the second keyway 53 is worn, it is only necessary to remove the connecting bolt 33 to remove the positioning plate 32 for replacement, without disassembling the valve body 1 or replacing the butterfly plate 31 and the valve stem body 5, thereby greatly simplifying the maintenance process.

[0035] As a separate, smaller component, the positioning plate 32 boasts a manufacturing cost significantly lower than replacing the entire butterfly plate 31 or valve stem body 5. This also reduces maintenance time and equipment downtime. The interference fit between the woodruff key 321 and the second keyway 53 ensures efficient torque transmission, while the connecting bolt 33, which penetrates the positioning plate 32 and base plate 31, creates a mechanical lock, preventing the key connection from loosening and failing.

[0036] In summary, this structure separates the semicircular key 321 and the positioning plate 32 from the butterfly plate 31 and the valve stem body 5 through modular design, fundamentally solving the technical problem of difficult and costly maintenance of the keyway of the traditional centerline butterfly valve.

[0037] Example 2: In order to realize the convenient disassembly and assembly of the valve body, the independent replacement of the valve seat and the stable sealing of the valve stem, as shown in FIG. Figure 2 、 Figure 3and Figure 4 As shown, in this embodiment, the valve body 1 includes an upper valve housing 11 and a lower valve housing 12, and the upper valve housing 11 and the lower valve housing 12 are fixedly connected by mounting bolts 113, and a valve seat 4 is sandwiched between the opposite sides of the upper valve housing 11 and the lower valve housing 12; the upper valve housing 11 is provided with a mounting seat 111, and the mounting seat 111 is used to install the worm gear drive device 2, and a first through hole 112 is opened on the mounting seat 111 for the top of the valve stem body 5 to pass through; a second through hole 121 is opened on the bottom inner side of the lower valve housing 12, and the second through hole 121 is for the bottom of the valve stem body 5 to pass through; the lower valve housing A mounting groove 123 is provided at the bottom of the valve seat 4, and a sealing bearing 124 is installed in the mounting groove 123; the bottom of the valve stem body 5 passes through the second through hole 121 and extends into the mounting groove 123, and is connected to the sealing bearing 124; a positioning bolt 122 is installed with a threaded inner thread of the mounting groove 123, and the positioning bolt 122 is used to position and tighten the sealing bearing 124; the upper and lower ends of the valve seat 4 respectively have a first reserved hole 41 and a second reserved hole 42, and the valve stem body 5 passes through the first reserved hole 41 and the second reserved hole 42 and is rotatably connected to the valve seat 4, and the inner wall of the valve seat 4 dynamically contacts the outer side of the butterfly plate 31. The valve stem body 5 is rotationally supported by the first reserved hole 41 and the second reserved hole 42 of the valve seat 4, forming a rotating pair independent of the butterfly plate 31, ensuring that the valve seat 4 can be replaced separately after wear. The mounting bolts 113 are evenly distributed along the circumference of the upper valve housing 11 and the lower valve housing 12, providing reliable flange connection sealing.

[0038] Example 3: In order to realize the detachable key connection between the opening and closing member and the valve stem and reduce the maintenance cost, as shown in FIG. Figure 5 and Figure 6 As shown, in this embodiment, a first screw hole 312 is formed on the butterfly plate 31 for the connecting bolt 33 to pass through; a second screw hole 322 is formed on the positioning plate 32 for the connecting bolt 33 to pass through; a first keyway 51 is formed on the upper end of the valve stem body 5 for transmission connection between the valve stem body 5 and the worm gear drive device 2; a shaft shoulder 54 is formed on the bottom of the valve stem body 5, which is rotatably mounted in the sealing bearing 124; a third screw hole 52 is formed on the valve stem body 5 for threaded connection with the connecting bolt 33. The connecting bolt 33 sequentially passes through the second screw hole 322 of the positioning plate 32 and the first screw hole 312 of the butterfly plate 31, and is screwed into the third screw hole 52 of the valve stem body 5 to form a triple lock; the semicircular key 321 is fixedly embedded in the positioning plate 32 and has an interference fit with the second keyway 53 of the valve stem body 5 to transmit torque.

[0039] When the present invention is used, the valve seat 4 is placed between the upper valve housing 11 and the lower valve housing 12 , and the valve body 1 is fixedly connected by installing bolts 113 to ensure that the first reserved hole 41 and the second reserved hole 42 of the valve seat 4 are coaxially aligned.

[0040] Place the butterfly plate 31 into the valve seat 4 , and adjust the direction of the butterfly plate 31 so that the slotted hole 311 thereof is coaxially aligned with the first reserved hole 41 and the second reserved hole 42 of the valve seat 4 .

[0041] Pass the valve stem body 5 through the first through hole 112 of the upper valve housing 11, the first reserved hole 41 of the valve seat 4, the slot 311 of the butterfly plate 31, the second reserved hole 42 of the valve seat 4 and the second through hole 121 of the lower valve housing 12 from top to bottom. At the same time, ensure that the second key groove 53 of the valve stem body 5 is aligned with the reserved groove 313 of the butterfly plate 31.

[0042] Insert the positioning plate 32 into the reserved groove 313 of the butterfly plate 31, insert the semicircular key 321 into the second key groove 53 of the valve stem body 5 to form an interference fit, and use the connecting bolt 33 to pass through the second screw hole 322 of the positioning plate 32 and the first screw hole 312 of the butterfly plate 31 in sequence, and screw it into the third screw hole 52 of the valve stem body 5 to complete the triple locking.

[0043] Install the sealed bearing 124 into the mounting groove 123 of the lower valve housing 12, insert the shaft shoulder 54 at the bottom of the valve stem body 5 into the sealed bearing 124, and screw in the positioning bolt 122 to tighten the sealed bearing 124 to prevent axial movement of the valve stem body 5. At this time, rotate the valve stem body 5 to check that the butterfly plate 31 rotates smoothly within the valve seat 4.

[0044] The worm gear drive device 2 is fixed to the mounting seat 111 of the upper valve housing 11 , and its output end is engaged with the first keyway 51 at the upper end of the valve stem body 5 through a key connection.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A keyway and valve stem matching structure of a centerline butterfly valve, comprising a valve body (1), a worm gear drive device (2) mounted on the valve body (1), and an opening and closing member (3) mounted in the valve body (1) through a valve stem body (5), characterized in that: The opening and closing member (3) includes a butterfly plate (31) and a positioning plate (32); a slotted hole (311) and a reserved slot (313) are provided on the butterfly plate (31); the positioning plate (32) is detachably mounted on the reserved slot (313) of the butterfly plate (31) via a connecting bolt (33); a semicircular key (321) is fixedly provided on the positioning plate (32); The valve stem body (5) passes through the slotted hole (311); a second keyway (53) matching the semicircular key (321) is provided on the valve stem body (5); the valve stem body (5) is connected to the opening and closing member (3) via a matching key between the semicircular key (321) and the second keyway (53).

2. The keyway and valve stem matching structure of a centerline butterfly valve according to claim 1 is characterized in that: The valve body (1) comprises an upper valve housing (11) and a lower valve housing (12), wherein the upper valve housing (11) and the lower valve housing (12) are fixedly connected by mounting bolts (113), and a valve seat (4) is sandwiched between opposite sides of the upper valve housing (11) and the lower valve housing (12).

3. The keyway and valve stem matching structure of a centerline butterfly valve according to claim 2, characterized in that: The upper valve housing (11) is provided with a mounting seat (111), the mounting seat (111) being used to mount the worm gear drive device (2), and a first through hole (112) for the top of the valve stem body (5) to pass through is formed on the mounting seat (111).

4. The keyway and valve stem matching structure of a centerline butterfly valve according to claim 2, characterized in that: A second through hole (121) is provided at the bottom inner side of the lower valve housing (12), and the second through hole (121) is for the bottom of the valve stem body (5) to pass through; a mounting groove (123) is provided at the bottom of the lower valve housing (12), and a sealing bearing (124) is installed in the mounting groove (123); the bottom of the valve stem body (5) passes through the second through hole (121) and extends into the mounting groove (123), and is connected to the sealing bearing (124); a positioning bolt (122) is installed in the inner thread of the mounting groove (123), and the positioning bolt (122) is used to position and press against the sealing bearing (124).

5. The keyway and valve stem matching structure of a centerline butterfly valve according to claim 2, characterized in that: The valve seat (4) is provided with a first reserved hole (41) and a second reserved hole (42) at the upper and lower ends, respectively. The valve stem body (5) passes through the first reserved hole (41) and the second reserved hole (42) and is rotatably connected to the valve seat (4). The inner wall of the valve seat (4) dynamically contacts the outer side of the butterfly plate (31).

6. The keyway and valve stem matching structure of a centerline butterfly valve according to claim 1, characterized in that: The butterfly plate (31) is provided with a first screw hole (312), and the first screw hole (312) is for the connecting bolt (33) to pass through.

7. The keyway and valve stem matching structure of a centerline butterfly valve according to claim 1, characterized in that: The positioning plate (32) is provided with a second screw hole (322), and the second screw hole (322) is for the connecting bolt (33) to pass through.

8. The keyway and valve stem matching structure of a centerline butterfly valve according to claim 1, characterized in that: A first keyway (51) is provided at the upper end of the valve stem body (5), and the first keyway (51) is used for transmission connection between the valve stem body (5) and the worm gear drive device (2); a shaft shoulder (54) is provided at the bottom of the valve stem body (5), and the shaft shoulder (54) is rotatably mounted in the sealing bearing (124); a third screw hole (52) is opened on the valve stem body (5), and the third screw hole (52) is used for threaded connection with the connecting bolt (33).

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