Stuffing box valve capable of being maintained on line

Abstract

The utility model relates to the field of valves, and discloses a stuffing box valve capable of being maintained on line. The stuffing box valve capable of being maintained on line comprises a valve body and a valve rod connected with the valve body in a rotating mode, the valve rod comprises an upper valve rod body and a lower valve rod body separated from the upper valve rod body, one end of the upper valve rod body is connected with an execution device, and the other end of the upper valve rod body is fixedly connected with one end of the lower valve rod body through a connecting piece. The valve rod between the lower valve rod and the valve body is coaxially sleeved with a stuffing box and a pressing plate, the connecting piece is detachably and fixedly connected with the upper valve rod and the lower valve rod, and the pressing plate can be separated from the valve rod through a gap between the upper valve rod and the lower valve rod, so that an executing mechanism does not need to be disassembled during stuffing maintenance, and the stuffing maintenance efficiency is improved. The pressing plate can be removed from the valve rod only by dismounting the connecting piece, so that the filler can be maintained and replaced, the operation is simple and rapid, and the filler maintenance working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a stuffing box valve capable of online maintenance. Background Art

[0002] Valves are one of the commonly used accessories in fluid conveying pipelines. The opening, closing and flow rate of fluid media can be regulated and controlled through valves. During the use of valves, its sealing performance is one of its important indicators, among which the stuffing box structure is an important sealing structure. Since valves need to be closed frequently for fluid control, the stuffing in the stuffing box will gradually wear out as the number of valve plate switching increases. Therefore, in order to ensure the performance of the valve, the stuffing needs to be replaced and maintained according to the usage.

[0003] like Figure 1 The stuffing box valve structure in the prior art shown, when the packing needs to be replaced, in order to obtain the space required for replacing the packing, first, the execution structure needs to be dismantled, and then the pressure plate needs to be removed from the valve stem before the packing can be maintained. The maintenance time is long and the work efficiency is low. The downtime caused by the packing maintenance will also lead to an increase in production costs, causing a burden on the enterprise. Utility Model Content

[0004] The utility model aims to provide a stuffing box valve capable of online maintenance, so that the packing can be replaced and maintained without dismantling the valve execution structure, thereby improving the packing maintenance work efficiency.

[0005] In order to solve the above technical problems, the implementation method of the utility model provides a technical solution as follows:

[0006] A valve with a stuffing box that can be maintained online comprises a valve body and a valve stem rotatably connected to the valve body, the valve stem comprising an upper valve stem and a lower valve stem separately arranged from the upper valve stem, one end of the upper valve stem is connected to an actuator, and the other end is fixedly connected to one end of the lower valve stem via a connecting piece, a stuffing box and a pressure plate are coaxially sleeved on the valve stem between the lower valve stem and the valve body, a cavity is provided on the inner ring of the stuffing box near the valve stem, and a stuffing is installed in the cavity; the connecting piece is in a detachable fixed connection with the upper valve stem and the lower valve stem, and the pressure plate can be separated from the valve stem through the gap between the upper valve stem and the lower valve stem.

[0007] Furthermore, the connecting member includes a first clamping block and a second clamping block, and the first clamping block and the second clamping block are arranged on both sides of the valve stem along the radial direction of the valve stem.

[0008] Further, the first clamp block is provided with a first upper connecting groove toward the upper valve stem, the first clamp block is provided with a first lower connecting groove toward the lower valve stem, the second clamp block is provided with a second upper connecting groove toward the upper valve stem, and the second clamp block is provided with a second lower connecting groove toward the lower valve stem, the first upper connecting groove and the second upper connecting groove are tightly fitted against the outer peripheral wall of the upper valve stem, and the first lower connecting groove and the second lower connecting groove are tightly fitted against the outer peripheral wall of the lower valve stem.

[0009] Furthermore, the upper valve stem is provided with a first boss toward the connecting member, and the lower valve stem is provided with a second boss toward the connecting member, the first upper connecting groove and the second upper connecting groove are tightly fitted against the outer peripheral wall of the first boss, and the first lower connecting groove and the second lower connecting groove are tightly fitted against the outer peripheral wall of the second boss.

[0010] Furthermore, the first boss and the second boss are in a polygonal column shape.

[0011] Furthermore, the first boss and the second boss are quadrangular prisms.

[0012] Furthermore, a gap is provided on the surfaces of the first clamping block and the second clamping block facing each other, and a fastening bolt is provided between the first clamping block and the second clamping block along the radial direction of the valve stem.

[0013] Furthermore, a cylindrical pin is provided between the end surfaces of the first clamping block and the second clamping block facing each other, and both ends of the cylindrical pin are respectively accommodated in the first clamping block and the second clamping block along the radial direction of the valve stem.

[0014] The utility model provides a stuffing box valve that can be maintained online. Compared with the prior art, the utility model has an upper valve stem and a lower valve stem that are separately arranged, so that the pressure plate can be separated from the valve stem from the gap between the upper valve stem and the lower valve stem without removing the actuator, so that the maintenance personnel can obtain sufficient space to maintain the packing, effectively improving the maintenance efficiency of the packing, reducing downtime, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0016] Figure 1 It is a schematic diagram of the structure of a stuffing box valve in the prior art;

[0017] Figure 2 It is a schematic diagram of the structure of a stuffing box valve capable of online maintenance in one embodiment of the utility model;

[0018] Figure 3 It is a partial cross-sectional structural diagram of a stuffing box valve capable of online maintenance in one embodiment of the utility model;

[0019] Figure 4 This is a front view of the exploded structure of the upper valve stem, the lower valve stem, and the connecting piece in one embodiment of the utility model;

[0020] Figure 5 is a top view of a connecting member in one embodiment of the utility model;

[0021] Figure 6 This is a front view of the exploded structure of the upper valve stem, the lower valve stem, and the connecting piece in another embodiment of the utility model;

[0022] Figure 7 It is a top view of a connecting piece in another embodiment of the present invention.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. bracket; 2. pressure plate; 21. pressing sleeve; 3. stuffing box; 4. stuffing; 5. valve stem; 51. upper valve stem; 511. first boss; 52. lower valve stem; 521. second boss; 6. sealing member; 7. valve plate; 8. valve body; 9. connecting member; 91. first clamping block; 911. first upper connecting groove; 912. first lower connecting groove; 92. second clamping block; 921. second upper connecting groove; 922. second lower connecting groove; 93. fastening bolt; 94. cylindrical pin. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0025] like Figure 1 As shown, a butterfly valve with a pressure plate 2 and a stuffing box 3 structure in the prior art is shown, the valve stem 5 is an integrated type, one end of the valve stem 5 is connected to the valve body 8, and the other end is connected to the bracket 1 and the execution structure (not shown in the figure), the valve stem 5 between the execution structure and the valve body 8 is sleeved with a stuffing box 3 and a pressure plate 2, the stuffing box 3 is provided with a cavity near the inner ring of the valve stem 5, and a stuffing 4 is installed, and pressure is applied to the stuffing 4 through the pressure plate 2, so that the stuffing 4 can seal the gap between the stuffing box 3 and the valve stem 5. Usually, the execution structure on the upper end of the valve stem 5 needs to be removed, and then the pressure plate 2 sleeved on the valve stem 5 is moved upward to be axially separated from the valve stem 5, so that the stuffing 4 can be maintained.

[0026] like Figure 2-3 As shown, in one embodiment of the utility model, a stuffing box valve that can be maintained online includes a valve body 8, the valve body 8 is provided with a through hole corresponding to a fluid medium pipeline, a valve plate 7 is provided in the through hole, the valve plate 7 is adapted to the through hole, the through hole is opened and closed by the rotation of the valve plate 7, a valve stem 5 is provided along the radial direction of the through hole, the valve stem 5 includes an upper valve stem 51 and a lower valve stem 52 separately provided from the upper valve stem 51, a fixed connection relationship is formed between the upper valve stem 51 and the lower valve stem 52 through a connecting member 9, one end of the upper valve stem 51 is connected to an execution structure (not shown in the drawings), and the other end is detachably fixedly connected to the connecting member 9, the lower valve stem 52 is radially penetrated on the valve body 8 along the through hole, one end of the lower valve stem 52 is connected to the outer wall of the valve body 8, and the other end extends out of the valve body 8, and the end extending beyond the valve body 8 is detachably fixedly connected to the connecting member 9. The valve plate 7 is fixedly arranged on the lower valve stem 52, and driven by the valve stem 5, can rotate in the through hole with the lower valve stem 52 as the rotation axis, thereby opening and closing the through hole. Preferably, a sealing member 6 is also provided in the through hole, and the sealing member 6 is used to seal the gap between the valve plate 7 and the valve body 8.

[0027] The connecting member 9 includes a first clamping block 91 and a second clamping block 92. The first clamping block 91 and the second clamping block 92 are symmetrically arranged on both sides of the valve stem 5 with the central axis of the valve stem 5 as the symmetry axis, and are fixedly connected to the upper valve stem 51 and the lower valve stem 52 in a radially enclosed manner.

[0028] A stuffing box 3 is provided at the joint between one end of the lower valve stem 52 extending beyond the valve body 8 and the valve body 8. A cavity is provided at the inner ring of the stuffing box 3 near the lower valve stem 52. A stuffing box 4 is installed in the cavity. A pressing sleeve 21 is provided above the stuffing box 4. A pressing plate 2 is provided above the pressing sleeve 21. The pressing plate 2, the pressing sleeve 21 and the stuffing box 4 are all coaxially sleeved on the lower valve stem 52. A fastener is provided between the pressing plate 2 and the stuffing box 3. The fastener can radially tighten the distance between the pressing plate 2 and the stuffing box 3 of the valve stem 5, thereby applying pressure to the pressing sleeve 21 through the pressing plate 2, and then transmitting the pressure to the stuffing box 4, so that the stuffing 4 can seal the gap between the stuffing box 3 and the valve stem 5.

[0029] like Figure 4-5As shown, in one embodiment, the first clamping block 91 is provided with a first upper connecting groove 911 at one end facing the upper valve stem 51, and the side wall of the first upper connecting groove 911 corresponds to the outer peripheral wall of the upper valve stem 51; the second clamping block 92 is provided with a second upper connecting groove 921 at one end facing the upper valve stem 51, and the second upper connecting groove 921 corresponds to the first upper connecting groove 911; the first clamping block 91 is provided with a first lower connecting groove 912 at one end facing the lower valve stem 52, and the side wall of the first lower connecting groove 912 corresponds to the outer peripheral wall of the lower valve stem 52; the second clamping block 92 is provided with a second lower connecting groove 922 at one end facing the lower valve stem 52, and the second lower connecting groove 922 corresponds to the first lower connecting groove 912. If the valve stem 5 is cylindrical, the side walls of the first upper connecting groove 911 and the first lower connecting groove 912 are arc-shaped to adapt to the circular peripheral wall of the valve stem 5, so that the side walls can fit tightly with the outer peripheral wall of the valve stem 5.

[0030] When the first clamping block 91 and the second clamping block 92 are closely mounted on the peripheral wall of the valve stem 5 , a gap is provided between the radially opposite end surfaces of the first clamping block 91 and the second clamping block 92 along the valve stem 5 .

[0031] When in use, the first clamp block 91 and the second clamp block 92 are radially enclosed and arranged on both sides of the valve stem 5, wherein the side walls of the first upper connecting groove 911 and the second upper connecting groove 921 are respectively fitted on both sides of the end of the upper valve stem 51, and the side walls of the first lower connecting groove 912 and the second lower connecting groove 922 are respectively fitted on both sides of the end of the lower valve stem 52, and the first clamp block 91 and the second clamp block 92 are radially locked using the fastening bolts 93, so that the side walls of the first upper connecting groove 911 and the second upper connecting groove 921 are tightly set against the outer wall of the upper valve stem 51, and the side walls of the first lower connecting groove 912 and the second lower connecting groove 922 are tightly set against the outer wall of the lower valve stem 52. Since a gap is provided between the radially opposite end surfaces of the first clamp block 91 and the second clamp block 92 along the valve stem 5, when the fastening bolts 93 are used to lock the first clamp block 91 and the second clamp block 92, the first clamp block 91 and the second clamp block 92 can be adjusted as needed. 1. The pressure between the second clamping block 92 and the valve stem 5 is used to adjust the friction between the first clamping block 91, the second clamping block 92 and the valve stem 5; under the action of the friction between the first upper connecting groove 911, the second upper connecting groove 921 and the upper valve stem 51, a fixed connection relationship is formed between the connecting member 9 and the upper valve stem 51, and the upper valve stem 51 can rotate synchronously with the connecting member 9; under the action of the friction between the first lower connecting groove 912 and the second lower connecting groove 922 and the lower valve stem 52, a fixed connection relationship is formed between the connecting member 9 and the lower valve stem 52, and the lower valve stem 52 can rotate synchronously with the connecting member 9. Under the action of the connecting member 9, the upper valve stem 51 and the lower valve stem 52 can rotate synchronously, and the force applied to the upper valve stem 51 by the actuator can be synchronously transmitted to the lower valve stem 52, thereby driving the valve plate 7 to rotate, and realizing the opening and closing of the valve plate 7.

[0032] like Figure 6-7As shown, in one embodiment, the upper valve stem 51 is provided with a first boss 511, and the lower valve stem 52 is provided with a second boss 521. The connecting member 9 is fixedly connected to the upper valve stem 51 through the first boss 511, and the connecting member 9 is fixedly connected to the lower valve stem 52 through the second boss 521. In this embodiment, the first boss 511 and the second boss 521 are both quadrangular prism-shaped, the first upper connecting groove 911 and the second upper connecting groove 921 match the outer peripheral wall of the first boss 511, and the first lower connecting groove 912 and the second lower connecting groove 922 match the outer peripheral wall of the second boss 521. When the first clamping block 91 and the second clamping block 92 are fitted on the peripheral walls of the first boss 511 and the second boss 521, a gap is provided between the radially opposite end faces of the first clamping block 91 and the second clamping block 92 along the valve stem 5. Of course, in other embodiments, the first boss 511 and the second boss 521 may also be in other shapes, such as triangular prism, pentagonal prism, hexagonal prism, etc. Due to the multi-prism design of the first boss 511 and the second boss 521, the fitting surfaces of the connecting member 9 and the first boss 511 and the second boss 521 can block each other in the circumferential direction, forming a more stable circumferential fixed connection relationship, thereby improving the reliability and stability of the synchronous rotation of the upper valve stem 51 and the lower valve stem 52.

[0033] When in use, the first clamp block 91 and the second clamp block 92 are radially enclosed and arranged on the peripheral wall of the first boss 511 and the second boss 521, wherein the side walls of the first upper connecting groove 911 and the second upper connecting groove 921 are enclosed and fitted on the peripheral wall of the first boss 511, and the side walls of the first lower connecting groove 912 and the second lower connecting groove 922 are enclosed and fitted on the peripheral wall of the second boss 521, and the first clamp block 91 and the second clamp block 92 are radially locked using the fastening bolts 93 so that the side walls of the first upper connecting groove 911 and the second upper connecting groove 921 are The first lower connecting groove 912 and the second lower connecting groove 922 are tightly arranged against the outer wall of the second boss 521. Since a gap is provided between the radially opposite end faces of the first clamp block 91 and the second clamp block 92 along the valve stem 5, when the first clamp block 91 and the second clamp block 92 are locked with the fastening bolt 93, the pressure between the first clamp block 91, the second clamp block 92 and the valve stem 5 can be adjusted as needed, thereby adjusting the friction between the first clamp block 91, the second clamp block 92 and the valve stem 5. At the same time, the first boss 511 and the second boss 521 can block each other with the connecting member 9 in the circumferential direction, so that a more stable circumferential fixed connection relationship is formed between the upper valve stem 51, the connecting member 9 and the second boss 521, thereby improving the reliability and stability of the synchronous rotation of the upper valve stem 51 and the lower valve stem 52.

[0034] In one embodiment, a cylindrical pin 94 is further provided between the end surfaces facing each other of the first clamp block 91 and the second clamp block 92. Both ends of the cylindrical pin 94 are respectively accommodated in the first clamp block 91 and the second clamp block 92 along the radial direction of the valve stem 5. The cylindrical pin 94 can play a guiding role when the first clamp block 91 and the second clamp block 92 are arranged to surround and fit the valve stem 5. At the same time, the cylindrical pin 94 can also prevent the first clamp block 91 from rotating circumferentially and moving axially relative to the second clamp block 92, thereby increasing the stability of the connection between the first clamp block 91 and the second clamp block 92 and the consistency of movement.

[0035] When it is necessary to maintain and replace the packing 4, first, the fastening bolts 93 of the connecting piece 9 are removed, and then the first clamping block 91 and the second clamping block 92 are radially separated from the upper valve stem 51 and the lower valve stem 52, so that the gap between the upper valve stem 51 and the lower valve stem 52 is exposed; then, the fasteners between the pressure plate 2 and the stuffing box 3 are removed, and the pressure plate 2 is moved axially along the lower valve stem 52 to the gap between the upper valve stem 51 and the lower valve stem 52, and then radially moved to completely separate the pressure plate 2 from the valve stem 5; when the pressure plate 2 is separated from the valve stem 5, it is more convenient for maintenance personnel to maintain and replace the packing 4. Compared with the prior art, the efficiency of maintenance and replacement of the packing 4 has been effectively improved, the downtime time has been reduced, and the production cost has been reduced.

[0036] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A stuffing box valve capable of online maintenance, characterized in that: It includes a valve body and a valve stem rotatably connected to the valve body, the valve stem includes an upper valve stem and a lower valve stem separately arranged from the upper valve stem, one end of the upper valve stem is connected to the actuator, and the other end is fixedly connected to one end of the lower valve stem through a connecting piece, a stuffing box and a pressure plate are coaxially sleeved on the valve stem between the lower valve stem and the valve body, a cavity is provided on the stuffing box near the inner ring of the lower valve stem, and a stuffing is installed in the cavity; the connecting piece is in a detachable fixed connection with the upper valve stem and the lower valve stem, and the pressure plate can be separated from the valve stem through the gap between the upper valve stem and the lower valve stem.

2. The online maintainable stuffing box valve according to claim 1, characterized in that: The connecting member comprises a first clamping block and a second clamping block, and the first clamping block and the second clamping block are arranged on both sides of the valve stem along the radial direction of the valve stem.

3. The online maintainable stuffing box valve according to claim 2, characterized in that: The first clamp block is provided with a first upper connecting groove toward the upper valve stem, the first clamp block is provided with a first lower connecting groove toward the lower valve stem, the second clamp block is provided with a second upper connecting groove toward the upper valve stem, and the second clamp block is provided with a second lower connecting groove toward the lower valve stem, the first upper connecting groove and the second upper connecting groove are tightly fitted against the outer peripheral wall of the upper valve stem, and the first lower connecting groove and the second lower connecting groove are tightly fitted against the outer peripheral wall of the lower valve stem.

4. The online maintainable stuffing box valve according to claim 3 is characterized in that: The upper valve stem is provided with a first boss toward the connecting member, and the lower valve stem is provided with a second boss toward the connecting member. The first upper connecting groove and the second upper connecting groove are tightly fitted with the outer peripheral wall of the first boss, and the first lower connecting groove and the second lower connecting groove are tightly fitted with the outer peripheral wall of the second boss.

5. The online maintainable stuffing box valve according to claim 4, characterized in that: The first boss and the second boss are in a polygonal column shape.

6. The online maintainable stuffing box valve according to claim 5, characterized in that: The first boss and the second boss are quadrangular prisms.

7. The online maintainable stuffing box valve according to claim 3 or 4, characterized in that: A gap is provided on the surfaces of the first clamping block and the second clamping block facing each other, and a fastening bolt is provided between the first clamping block and the second clamping block along the radial direction of the valve stem.

8. The online maintainable stuffing box valve according to claim 7, characterized in that: A cylindrical pin is also provided between the end surfaces of the first clamping block and the second clamping block facing each other, and both ends of the cylindrical pin are respectively accommodated in the first clamping block and the second clamping block along the radial direction of the valve stem.

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