A butterfly valve structure facilitating replacement of packing

Abstract

The utility model discloses a kind of butterfly valve structures facilitating to replace packing, including valve body, butterfly plate and bonnet, bonnet is fixed on valve body, valve shaft connected by butterfly plate is through bonnet and is connected to actuating mechanism, sealing packing structure is further equipped on bonnet, valve shaft includes upper valve part, lower valve rod and connecting rod device, locking groove is equipped on lower valve rod, radial telescopic locking rod is equipped on bonnet, radial telescopic locking rod is relative locking groove and is telescopic locking lower valve rod axial and circumferential activity;The butterfly valve of the utility model is locked by setting the locking structure scheme to valve shaft, so that when only packing part of butterfly valve is maintained and replaced, the locking of valve shaft and butterfly plate can be realized by locking structure, so that butterfly plate is locked and closed valve, it does not affect the closed valve use of valve, and the setting of connecting rod device is given, so that butterfly valve can not need to disassemble actuating mechanism when replacing, and the above-mentioned not only can facilitate to maintain and replace packing in advance, but also can be conveniently installed and calibrated after maintenance.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically to a butterfly valve structure that facilitates packing replacement. Background Technology

[0002] Butterfly valves are widely used in equipment in the petroleum, petrochemical, metallurgical, power generation, and papermaking industries. They are control elements in fluid systems and can meet various ordinary and harsh fluid shut-off requirements. Butterfly valves are used in high-pressure and rapid shut-off applications. The valve stem experiences significant wear on the packing, thus requiring a relatively shorter maintenance cycle. However, when replacing the packing of a conventional butterfly valve, the upstream valve is usually closed, and then the valve is disassembled to replace the packing. This process not only requires disassembling the packing but also disassembling multiple components such as the valve stem and valve cover. After successfully replacing the packing, it needs to be reinstalled in reverse, and due to the complete disassembly, secondary calibration of the valve, including the actuator, is required. This maintenance process is cumbersome and results in unnecessary time costs. Utility Model Content

[0003] In view of the prior art, the purpose of this utility model is to provide a butterfly valve structure that facilitates online maintenance of the butterfly valve packing components by staff. Compared with the prior art, the butterfly valve in this embodiment can stably seal the medium flow channel by itself, and the valve's closing function is not affected during replacement.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a butterfly valve structure that facilitates packing replacement, comprising a valve body, a butterfly plate, and a valve cover. The valve cover is fixed on the valve body, and the valve shaft connected to the butterfly plate passes through the valve cover and connects to the actuator. The valve cover is also provided with a sealing packing structure. The valve shaft includes an upper valve part, a lower valve stem, and a connecting rod. The lower valve stem is provided with a locking groove, and the valve cover is provided with a radial telescopic locking rod. The radial telescopic locking rod telescopically locks the lower valve stem in both axial and circumferential directions relative to the locking groove.

[0005] As a further feature of the above scheme, the valve cover is also provided with a secondary pressure cover, and the sealing packing structure and the radial telescopic locking rod are located on the secondary pressure cover. The sealing packing structure includes a pressure sleeve, a pressure ring, a packing ring and a bottom ring.

[0006] As a further feature of the above scheme, the locking groove on the lower valve stem is a waist-shaped groove structure, and a stop block is also provided in the locking groove. The front ends of the radial telescopic locking rod are provided with flat parts on both sides that match the locking groove, and the side facing the stop block is provided with a lower abutting slope that matches the corresponding pushing slope on the stop block.

[0007] As a further feature of the above scheme, the secondary pressure cap is provided with a telescopic screw hole, and the radial telescopic locking rod includes an abutment shaft that extends and retracts along the axial direction of the telescopic screw hole and a threaded shaft that is circumferentially movable with the abutment shaft. The threaded shaft is threadedly engaged with the telescopic screw hole.

[0008] As a further feature of the above solution, the telescopic screw hole is also provided with an outer cover, the outer cover being threadedly connected to the telescopic screw hole, and the outer cover having a tool groove at the end facing outward from the threaded shaft.

[0009] As a further feature of the above scheme, the locking groove is provided in two sets, and the two sets of locking grooves correspond to the open and closed valve states of the medium flow channel provided in the valve body relative to the butterfly plate.

[0010] Beneficial effects: The butterfly valve of this utility model, by setting a locking structure for the valve shaft, can lock the valve shaft and butterfly plate when only the packing part of the butterfly valve is maintained or replaced. This locks the butterfly plate to close the valve without affecting its use. Furthermore, the addition of a linkage allows the butterfly valve to be replaced without disassembling the actuator. In summary, this not only facilitates the maintenance and replacement of the packing but also makes installation and calibration after maintenance convenient. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the butterfly valve structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the cross-sectional structure of the butterfly valve in this embodiment.

[0013] Figure 3 This is an example. Figure 2 A magnified view of a portion of the image.

[0014] Figure 4 This is a schematic diagram of the locking structure assembly of the valve shaft in this embodiment.

[0015] Reference numerals: 1. Valve body; 2. Butterfly plate; 3. Valve cover; 4. Valve shaft; 41. Upper valve section; 42. Lower valve stem; 43. Connecting rod; 45. Abutment block; 46. Abutment ramp; 48. Lock groove; 5. Actuator; 6. Radial telescopic locking rod; 61. Abutment shaft; 62. Threaded shaft; 63. Outer cover; 65. Lower abutment ramp; 67. Flat section; 68. Tool groove; 7. Secondary gland; 71. Telescopic screw hole; 8. Medium flow channel; 9. Sealing packing structure; 91. Pressure sleeve; 92. Pressure ring; 93. Packing ring; 94. Bottom ring. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.

[0017] like Figure 1-4 The butterfly valve structure shown includes a valve body 1, a butterfly plate 2, and a valve cover 3. The valve cover 3 is fixed on the valve body 1. The valve shaft 4 connected to the butterfly plate 2 passes through the valve cover 3 and connects to the actuator 5. The valve cover 3 is also provided with a sealing packing structure 9. The valve shaft 4 includes an upper valve part 41, a lower valve stem 42, and a connecting rod 43. The lower valve stem 42 is provided with a locking groove 48. The valve cover 3 is provided with a radial telescopic locking rod 6. The radial telescopic locking rod 6 telescopically locks the lower valve stem 42 in both axial and circumferential directions relative to the locking groove 48.

[0018] As a further provision of the above scheme, the valve cover 3 is also provided with a secondary pressure cover 7, and the sealing packing structure 9 and the radial telescopic locking rod 6 are located on the secondary pressure cover 7. The sealing packing structure 9 includes a pressure sleeve 91, a pressure ring 92, a packing ring 93 and a bottom ring 94.

[0019] As a further feature of the above scheme, the locking groove 48 provided on the lower valve stem 42 is a waist-shaped groove structure, and a stop block 45 is also provided in the locking groove 48. The radial telescopic locking rod 6 has flat parts 67 on both sides of its front end that match the locking groove 48, and its side facing the stop block 45 has a lower abutting slope 65 that matches the corresponding pushing slope 46 provided on the stop block 45.

[0020] As a further feature of the above scheme, the secondary pressure cap 7 is provided with a telescopic screw hole 71, and the radial telescopic locking rod 6 includes an abutment shaft 61 that extends and retracts along the axial direction of the telescopic screw hole 71, and a threaded shaft 62 that is circumferentially movable with the abutment shaft 61. The threaded shaft 62 is threadedly engaged with the telescopic screw hole 71.

[0021] As a further provision of the above scheme, the telescopic screw hole 71 is also provided with an outer cover 63, the outer cover 63 is threaded to the telescopic screw hole 71, and the outer cover 63 and the outward-facing end of the threaded shaft 62 are provided with a tool groove 68.

[0022] As a further feature of the above scheme, the locking groove 48 is provided in two sets, and the two sets of locking grooves 48 correspond to the open and closed valve states of the butterfly plate 2 relative to the medium flow channel 8 provided in the valve body 1.

[0023] refer to Figure 1 and Figure 2The butterfly valve structure of this utility model, as shown, differs from the prior art in that it uses a two-stage connection of the valve shaft 4. When needed, the upper valve section 41 connected to the actuator 5 and the lower valve stem 42 connected to the butterfly plate 2 can be separated by disassembling the connecting rod 43. It is worth noting that... Figure 2 As shown, a gap is provided between the ends of the upper valve part 41 and the lower valve stem 42. This gap can be reasonably used to remove the pressure sleeve 91, pressure ring 92, packing ring 93, and bottom ring 94 of the internal sealing packing structure 9 without disassembling the valve cover 3 and valve shaft 4. The specific operation is as follows: When the operator needs to replace the sealing packing structure 9 of the butterfly valve, they can do so by rotating the butterfly plate 2 to the closed position, such as... Figure 2 In the sealed closed valve state shown, by inserting a tool into the tool slot 68 to open the outer cover 63, and after removing the outer cover 63, the tool can be inserted again to rotate the threaded shaft 62. Through the threaded engagement, it is rotated to extend inwards. Since the butterfly plate 2 is preset to the closed valve state, the locking groove 48 is aligned with the abutment shaft 61. At this time, the abutment shaft 61 extends into the locking groove 48 until the lower abutment slope 65 of the abutment shaft 61 matches the pushing slope 46 of the abutment block 45 provided in the locking groove 48, thus completing the restriction and locking. At this point, the sealed valve can be disassembled. The sealing packing structure 9 is used, and the two flat parts 67 on both sides of the front end of the abutment shaft 61 of the radial telescopic locking rod 6 at this time abut against the two side walls of the locking groove 48 in a circumferential abutment, thereby forming a circumferential limit. Similarly, the lower abutment slope 65 of the abutment shaft 61 abuts against the pushing slope 46 of the abutment block 45 provided in the locking groove 48 to form an axial movement limit for the valve shaft 4. Thus, when the sealing packing structure 9 is removed, the valve shaft 4 can remain fixed in both the circumferential and axial directions, avoiding the problem of the butterfly plate moving or the valve shaft 4 coming off during the disassembly process, and ensuring the smooth progress of maintenance.

[0024] After maintenance is completed, the radial telescopic locking rod 6 can be disengaged from the locking groove 48 by reversing the above operation. It is worth noting that the disengagement distance should be sufficient so as not to interfere with the operation of the lower valve rod 42.

[0025] Furthermore, the radial telescopic locking rod 6 of this embodiment can also be extended to lock the working state of the valve, that is, as mentioned above, a locking groove 48 corresponding to the open state of the butterfly plate 2 is provided on the circumference of the lower valve rod 42. The principle is as above, that is, in the open state, the operator can lock the lower valve rod 42 by operating a tool. In this state, firstly, it can prevent the butterfly plate 2 from rotating under the push of the medium, and secondly, it can prevent the butterfly plate 2 from shifting due to accidental contact with the actuator 5.

[0026] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A butterfly valve structure for easy packing replacement, comprising a valve body (1), a butterfly plate (2), and a valve cover (3), wherein the valve cover (3) is fixed on the valve body (1), and a valve shaft (4) connected to the butterfly plate (2) passes through the valve cover (3) and connects to an actuator (5), and the valve cover (3) is further provided with a sealing packing structure (9), characterized in that: The valve shaft (4) includes an upper valve part (41), a lower valve stem (42) and a connecting rod (43). The lower valve stem (42) is provided with a locking groove (48), and the valve cover (3) is provided with a radial telescopic locking rod (6). The radial telescopic locking rod (6) telescopically locks the lower valve stem (42) in axial and circumferential directions relative to the locking groove (48).

2. The butterfly valve structure for easy packing replacement according to claim 1, characterized in that: The valve cover (3) is also provided with a secondary pressure cover (7). The sealing packing structure (9) and the radial telescopic locking rod (6) are located on the secondary pressure cover (7). The sealing packing structure (9) includes a pressure sleeve (91), a pressure ring (92), a packing ring (93), and a bottom ring (94).

3. The butterfly valve structure for easy packing replacement according to claim 1, characterized in that: The locking groove (48) provided on the lower valve stem (42) is a waist-shaped groove structure. The locking groove (48) is also provided with a stop block (45). The radial telescopic locking rod (6) has flat parts (67) on both sides of its front end that match the locking groove (48). Its side facing the stop block (45) has a lower abutting slope (65) that matches the corresponding pushing slope (46) provided on the stop block (45).

4. The butterfly valve structure for easy packing replacement according to claim 2, characterized in that: The secondary pressure cap (7) is provided with a telescopic screw hole (71), and the radial telescopic locking rod (6) includes an abutment shaft (61) that extends and retracts along the axial direction of the telescopic screw hole (71) and a threaded shaft (62) that is circumferentially movable with the abutment shaft (61). The threaded shaft (62) is threadedly engaged with the telescopic screw hole (71).

5. The butterfly valve structure for easy packing replacement according to claim 4, characterized in that: The telescopic screw hole (71) is also provided with an outer cover (63), the outer cover (63) is threaded to the telescopic screw hole (71), and the outer cover (63) and the outward-facing end of the threaded shaft (62) are provided with a tool groove (68).

6. The butterfly valve structure for easy packing replacement according to claim 1, characterized in that: The locking groove (48) is provided in two sets, and the two sets of locking grooves (48) correspond to the open and closed valve states of the medium flow channel (8) provided in the valve body (1) of the butterfly plate (2).

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