High-pressure isolating valve

Abstract

The utility model provides a high-pressure isolating valve. The high-pressure isolating valve comprises a valve body and a valve core, the valve rod is movably arranged in the valve body; the valve cover is fixedly arranged on the valve body, a mounting hole is formed in the valve cover, the valve rod is arranged in the mounting hole in a penetrating manner, and a stuffing box is arranged between the inner wall of the mounting hole and the outer wall of the valve rod; the pressing mechanism comprises a pressing plate and a supporting frame, the supporting frame is fixedly arranged on the valve body, the pressing plate is movably arranged on the supporting frame and arranged on the valve rod in a sleeving mode, the pressing plate is provided with a pressing position and an avoiding position which are oppositely arranged relative to the stuffing box, and when the pressing plate is located at the pressing position, the pressing plate abuts against the stuffing box so as to press the stuffing box; when the pressing plate is located at the avoiding position, a gap is formed between the pressing plate and the stuffing box; and the driving mechanism is used for driving the pressing plate to be switched from the avoiding position to the pressing position. By the adoption of the technical scheme, the problem that in the prior art, leakage is generated when a stuffing box of a high-pressure isolation valve is replaced online, and personnel injury is easily caused can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a high-pressure isolation valve. Background Art

[0002] With the rapid development of the coal chemical industry, large-scale coal-to-liquid chemical companies are constantly emerging, and these companies are developing large-scale air separation units to support their development. Multiple air separation compressor units share a common steam main. During the maintenance and turnover of the air separation unit, packing leakage occurs during and after the high-pressure valves are closed, seriously affecting the maintenance schedule and the long-term operation of the unit. To prevent steam leakage without stopping the entire production line, the packing in the stuffing box must be replaced under pressure.

[0003] In the prior art, a high-pressure isolation valve is usually used to control the on-off of the steam main pipe. The high-pressure isolation valve includes a valve stem and a valve cover. A stuffing box is provided on the valve cover. A valve core is provided at the end of the valve stem. The valve stem controls the movement of the valve core in the valve body to control the on-off of the high-pressure isolation valve. When the high-pressure isolation valve is in a fully open state, the valve core of the high-pressure isolation valve will seal with the valve cover. At this time, the valve core can replace the sealing function of the stuffing box to temporarily seal the valve body, and workers can replace the stuffing of the stuffing box on the valve cover. However, when replacing the stuffing, the fixed structure of the stuffing box needs to be removed. Due to steam pressure fluctuations, the valve stem may move, resulting in an unstable seal between the valve core and the valve cover. High-temperature and high-pressure steam can easily impact the stuffing box. The loosening of the stuffing box causes high-temperature and high-pressure steam to spray out of the valve cover, injuring the operator who is replacing the stuffing. Utility Model Content

[0004] The utility model provides a high-pressure isolation valve to solve the problem in the prior art that leakage during online replacement of a stuffing box of a high-pressure isolation valve may easily cause personal injury.

[0005] The utility model provides a high-pressure isolation valve, which includes: a valve body; a valve stem, which is movably arranged in the valve body; a valve cover, which is fixed on the valve body and provided with a mounting hole, the valve stem is passed through the mounting hole, and a stuffing box is provided between the inner wall of the mounting hole and the outer wall of the valve stem; a clamping mechanism, which includes a pressure plate and a support frame, the support frame is fixed on the valve body, the pressure plate is movably arranged on the support frame, and is sleeved on the valve stem, the pressure plate has a relatively set clamping position and an avoidance position relative to the stuffing box, when the pressure plate is in the clamping position, the pressure plate abuts against the stuffing box to clamp the stuffing box, and when the pressure plate is in the avoidance position, there is a gap between the pressure plate and the stuffing box; a driving mechanism, the driving mechanism is used to drive the pressure plate to switch from the avoidance position to the clamping position.

[0006] Furthermore, the driving mechanism has an elastic member, which is arranged on the support frame. One end of the elastic member abuts against the pressure plate, and the other end of the elastic member abuts against the inner wall of the support frame away from the pressure plate. The elastic member is used to provide an elastic force toward the valve cover side with the pressure plate.

[0007] Furthermore, the driving mechanism also has a limit member, which is arranged on the support frame. The limit member has a relatively set limit state and a release state. When the pressure plate is in the avoidance position, the limit member is in the limit state. The limit member cooperates with the pressure plate limit to limit the movement of the pressure plate toward the valve cover. When the pressure plate is in the release state, the pressure plate can move toward the valve cover under the drive of the elastic member to switch the pressure plate to the clamping position.

[0008] Furthermore, the limiting member includes a hook, which is arranged on the support frame. When the limiting member is in a limiting state, the hook abuts against the end face of the pressure plate facing the valve cover. When the limiting member is in a released state, the hook avoids the pressure plate.

[0009] Furthermore, the limiting member also includes a rotating shaft, which is rotatably arranged on the support frame. Two hooks are provided, and the two hooks are respectively arranged at both ends of the rotating shaft. The hooks can rotate relative to the pressure plate under the drive of the rotating shaft to switch the limiting member between the limiting state and the release state.

[0010] Furthermore, the elastic member includes a plurality of springs, which are distributed in an annular manner around the axis of the valve stem. When the pressure plate is in the tightening position, the springs are in an elastically deformed state.

[0011] Furthermore, a guide structure is provided between the pressing plate and the support frame to guide the movement of the pressing plate between the pressing position and the avoidance position.

[0012] Furthermore, the support frame includes two oppositely arranged vertical plates, and the pressure plate is provided with two guide grooves, which are arranged in one-to-one correspondence with the vertical plates. The guide grooves cooperate with the vertical plates to form a guiding structure.

[0013] Furthermore, the pressure plate has a connecting hole, and the valve stem is passed through the connecting hole on the pressure plate. An extrusion boss is provided in an annular shape on the outer periphery of the port of the connecting hole facing the stuffing box. The extrusion boss is used to abut against the stuffing box, and the diameter of the end face of the extrusion boss facing the stuffing box is adapted to the diameter of the stuffing box.

[0014] Furthermore, the extrusion boss includes a conical segment and a straight segment connected to each other, a straight segment is provided on a side of the conical segment away from the pressing plate, and a diameter of the conical segment gradually decreases toward the straight segment.

[0015] With this arrangement, during normal operation of the high-pressure isolation valve, the valve stem drives the valve core to move within the valve body, thereby controlling the flow of the high-pressure steam line. The stuffing box disposed between the valve stem and the mounting hole seals the gap between the mounting hole and the valve stem, preventing high-pressure steam leakage. Over the long-term operation of the air separation unit, the packing in the stuffing box deteriorates, affecting its sealing performance. In this case, the stuffing box cover must be removed and replaced. Without shutting down the unit, the valve core can be switched to the fully open position, temporarily sealing the mounting hole while ensuring fluid flow to prevent steam leakage. The pressure plate can then be switched to a relief position, creating space for personnel to replace the packing. If steam pressure causes the valve stem to move, compressing the seal between the valve core and the valve cover, the drive device can be used to drive the pressure plate from the relief position to the compression position, causing it to press against the stuffing box, temporarily sealing it and preventing steam from escaping and injuring personnel performing the packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram showing a pressure plate of a high-pressure isolation valve provided by the present invention in a compressed position is shown;

[0018] Figure 2 A structural schematic diagram showing the pressure plate of the high-pressure isolation valve provided by the present invention is in an avoidance position.

[0019] The above drawings include the following reference numerals:

[0020] 100, valve body;

[0021] 200, valve stem;

[0022] 300, valve cover; 310, stuffing box;

[0023] 410, pressing plate; 411, extrusion boss; 4111, tapered segment; 4112, straight segment;

[0024] 420, support frame; 421, vertical plate;

[0025] 430, elastic member;

[0026] 440, hook;

[0027] 450. Shaft. DETAILED DESCRIPTION

[0028] 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 some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. 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.

[0029] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a high-pressure isolation valve, which includes a valve body 100, a valve stem 200, a valve cover 300, a clamping mechanism, and a driving mechanism. The valve stem 200 is provided with a valve core, which is movably disposed within the valve body 100 for driving the valve core. The valve cover 300 is fixed to the valve body 100 and has a mounting hole formed in the valve cover 300. The valve stem 200 is inserted into the mounting hole. A stuffing box 310 is disposed between the inner wall of the mounting hole and the outer wall of the valve stem 200. The clamping mechanism includes a pressure plate 410 and a support frame 420. The support frame 420 is fixedly mounted on the valve body 100. The pressure plate 410 is movably mounted on the support frame 420 and sleeved onto the valve stem 200. The pressure plate 410 has a clamping position and a relief position relative to the stuffing box 310. When the pressure plate 410 is in the clamping position, it abuts against the stuffing box 310 to compress the stuffing box 310. When the pressure plate 410 is in the relief position, a gap is formed between the pressure plate 410 and the stuffing box 310. The driving mechanism is used to drive the pressure plate 410 to switch from the relief position to the pressure position.

[0030] With the above arrangement, during normal operation of the high-pressure isolation valve, the valve stem 200 drives the valve core to move within the valve body 100, thereby controlling the flow of high-pressure steam through the pipeline. The stuffing box 310, located between the valve stem 200 and the mounting hole, seals the gap between the mounting hole and the valve stem 200, preventing high-pressure steam leakage. Over the long-term operation of the air separation unit, the packing in the stuffing box 310 deteriorates, affecting its sealing performance. In this case, the cover of the stuffing box 310 must be removed and replaced. Without shutting down the unit, the valve core can be switched to the fully open position, temporarily sealing the mounting hole while ensuring fluid flow and preventing steam leakage. During this time, the pressure plate 410 can be switched to a relief position, creating space for personnel to replace the packing. If steam pressure causes the valve stem 200 to move, compressing the seal between the valve core and the valve cover 300, the drive device can be used to drive the pressure plate from the relief position to the compression position, causing the pressure plate 410 to press against the stuffing box 310, providing a temporary seal and preventing steam from escaping and injuring personnel during packing.

[0031] Furthermore, the drive mechanism includes an elastic member 430, which is mounted on the support frame 420. One end of the elastic member 430 abuts against the pressure plate 410, while the other end abuts against the inner wall of the support frame 420 at the end away from the pressure plate 410. The elastic member 430 is used to provide an elastic force against the pressure plate 410 toward the valve cover 300. This arrangement enables the elastic member 430 to provide a driving force on the pressure plate 410, causing it to move toward the stuffing box 310. This allows the pressure plate 410 to squeeze the stuffing box 310, temporarily sealing the stuffing box 310 while the packing is being replaced, and preventing injury to personnel.

[0032] In a specific embodiment of the present application, the elastic member 430 includes multiple springs that are annularly spaced about the axis of the valve stem 200 to ensure that the multiple springs exert a balanced elastic force on various parts of the pressure plate 410, preventing the pressure plate 410 from tilting and reducing the compression effect. When the pressure plate 410 is in the compression position, the springs are in an elastically deformed state. With this arrangement, when the pressure plate 410 is in the compression position, the springs continuously provide elastic force to the pressure plate 410, ensuring that the pressure plate 410 is not impacted by the stuffing box 310 and moves in the opposite direction.

[0033] Specifically, the driving mechanism also has a limit member, which is arranged on the support frame 420. The limit member has a relatively set limit state and a release state. When the pressure plate 410 is in the avoidance position, the limit member is in the limit state. The limit member cooperates with the pressure plate 410 to limit the movement of the pressure plate 410 toward the valve cover 300. When the pressure plate 410 is in the release state, the pressure plate 410 can move toward the valve cover 300 under the drive of the elastic member 430, so that the pressure plate 410 switches to the clamping position. Through the above-mentioned arrangement, the state of the pressure plate 410 can be adjusted by switching the limiting member between the limiting state and the release state. When the packing needs to be replaced normally, the pressure plate 410 can be moved so that the pressure plate 410 overcomes the elastic force of the elastic member 430 and switches to the avoidance position, and the limiting member in the limiting state prevents the pressure plate 410 from falling off; when steam leakage occurs, the limiting member can be switched to the release state, so that the pressure plate 410 is driven by the elastic member 430 and quickly switches to the clamping position to achieve rapid temporary sealing.

[0034] Specifically, the position-limiting member includes a hook 440, which is disposed on the support frame 420. When the position-limiting member is in the limiting state, the hook 440 abuts against the end surface of the pressure plate 410 on the side facing the valve cover 300. When the position-limiting member is in the released state, the hook 440 is arranged to avoid the pressure plate 410. Through the above arrangement, when the pressure plate 410 is in the avoidance position, the hook 440 can hook the pressure plate 410, preventing the pressure plate 410 from moving under the action of the elastic member 430. When it is necessary to switch the pressure plate 410 to the clamping position, the hook 440 is separated from the pressure plate 410, and the pressure plate 410 can move to the clamping position under the drive of the elastic member 430.

[0035] In some feasible embodiments of the present application, a hanging ring that cooperates with the hook 440 can be provided on the pressing plate 410 to connect the hook 440 and the pressing plate 410.

[0036] In some other feasible embodiments of the present application, the position-limiting member further includes a rotating shaft 450, which is rotatably disposed on the support frame 420. Two hooks 440 are provided, and the two hooks 440 are respectively disposed at both ends of the rotating shaft 450. The hooks 440 can rotate relative to the pressure plate 410 under the drive of the rotating shaft 450 to switch the position-limiting member between a restricted state and a released state. Through the above arrangement, the hooks 440 can directly cooperate with the body of the pressure plate 410 to limit the position. When it is necessary to separate the hooks 440 and the pressure plate 410, only the rotating shaft 450 needs to be rotated to quickly release the pressure plate 410, which is convenient for the operator to operate.

[0037] Furthermore, a guide structure is provided between the pressure plate 410 and the support frame 420 to guide the movement of the pressure plate 410 between the pressing position and the avoidance position. Through this arrangement, the guide structure ensures smooth movement of the pressure plate 410 along the support frame 420 and ensures that the pressure plate 410 is aligned with the stuffing box 310, preventing the pressure plate 410 from deviating and ensuring the compression effect of the pressure plate 410.

[0038] Specifically, the support frame 420 includes two opposed vertical plates 421. The pressure plate 410 is provided with two guide grooves, which correspond one to each of the vertical plates 421. The guide grooves cooperate with the vertical plates 421 to form a guiding structure. Through this arrangement, the pressure plate 410 can move along the vertical plates 421 through the guide grooves, and the vertical plates 421 guide the movement of the pressure plate 410.

[0039] The present application does not limit the specific shape of the upright plate 421, as long as it can provide guidance for the movement of the pressing plate 410 and can support the support frame 420. In other embodiments of the present application, the support frame 420 can also be formed by guide posts, and the pressing plate 410 is provided with guide holes that cooperate with the guide posts, and the guide holes form a guide structure.

[0040] In the present application, the pressure plate 410 has a connection hole through which the valve stem 200 is inserted. A compression boss 411 is annularly provided around the outer periphery of the connection hole, which faces the stuffing box 310. The compression boss 411 is configured to abut against the stuffing box 310. The diameter of the end surface of the compression boss 411 facing the stuffing box 310 matches the diameter of the stuffing box 310. This configuration increases the pressure exerted by the pressure plate 410 on the stuffing box 310, ensuring a positive compression effect.

[0041] Furthermore, the extrusion boss 411 includes a tapered section 4111 and a straight section 4112 connected to each other. The straight section 4112 is provided on the side of the tapered section 4111 away from the pressure plate 410. The straight section 4112 provides a compression effect on the stuffing box 310. The diameter of the tapered section 4111 gradually decreases as it approaches the straight section 4112. This configuration allows the tapered section 4111 to more effectively transmit the pressure of the pressure plate 410, thereby enhancing the extrusion effect of the pressure plate 410.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0044] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0045] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0046] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A high-pressure isolation valve, characterized in that: The high-pressure isolation valve comprises: Valve body (100); a valve stem (200), the valve stem (200) being movably disposed in the valve body (100); A valve cover (300) is fixedly mounted on the valve body (100), a mounting hole is provided on the valve cover (300), the valve stem (200) is inserted into the mounting hole, and a stuffing box (310) is provided between the inner wall of the mounting hole and the outer wall of the valve stem (200); A pressing mechanism includes a pressing plate (410) and a support frame (420), wherein the support frame (420) is fixedly arranged on the valve body (100), and the pressing plate (410) is movably arranged on the support frame (420) and sleeved on the valve stem (200). The pressing plate (410) has a pressing position and an escape position relatively arranged relative to the stuffing box (310). When the pressing plate (410) is in the pressing position, the pressing plate (410) abuts against the stuffing box (310) to press the stuffing box (310). When the pressing plate (410) is in the escape position, a gap is formed between the pressing plate (410) and the stuffing box (310); A driving mechanism is provided, wherein the driving mechanism is used to drive the pressing plate (410) to switch from the avoidance position to the pressing position.

2. The high-pressure isolation valve according to claim 1, characterized in that The driving mechanism has an elastic member (430), and the elastic member (430) is arranged on the support frame (420). One end of the elastic member (430) abuts against the pressure plate (410), and the other end of the elastic member (430) abuts against the inner wall of the support frame (420) away from the pressure plate (410). The elastic member (430) is used to provide an elastic force to the pressure plate (410) toward the side of the valve cover (300).

3. The high-pressure isolation valve according to claim 2, characterized in that: The driving mechanism further comprises a limiting member, which is arranged on the support frame (420). The limiting member has a limiting state and a releasing state that are relatively arranged. When the pressure plate (410) is in the avoidance position, the limiting member is in the limiting state. The limiting member and the pressure plate (410) are limitedly matched to limit the movement of the pressure plate (410) toward the valve cover (300). When the pressure plate (410) is in the releasing state, the pressure plate (410) can move toward the valve cover (300) under the drive of the elastic member (430), so that the pressure plate (410) switches to the pressing position.

4. The high-pressure isolation valve according to claim 3, characterized in that The limiting member includes a hook (440), and the hook (440) is arranged on the support frame (420). When the limiting member is in the limiting state, the hook (440) abuts against the end surface of the pressure plate (410) on the side facing the valve cover (300). When the limiting member is in the releasing state, the hook (440) avoids the pressure plate (410).

5. The high-pressure isolation valve according to claim 4, characterized in that: The limiting member further includes a rotating shaft (450), and the rotating shaft (450) is rotatably arranged on the support frame (420). Two hooks (440) are provided, and the two hooks (440) are respectively arranged at both ends of the rotating shaft (450). The hooks (440) can be rotated relative to the pressure plate (410) under the drive of the rotating shaft (450), so that the limiting member switches between the limiting state and the released state.

6. The high-pressure isolation valve according to claim 2, characterized in that: The elastic member (430) includes a plurality of springs, and the plurality of springs are distributed in an annular manner around the axis of the valve stem (200). When the pressure plate (410) is in a compressed position, the springs are in an elastically deformed state.

7. The high-pressure isolation valve according to claim 1, characterized in that A guide structure is provided between the pressing plate (410) and the support frame (420) to guide the movement of the pressing plate (410) between the pressing position and the avoidance position.

8. The high-pressure isolation valve according to claim 7, characterized in that: The support frame (420) includes two vertical plates (421) arranged opposite to each other, and the pressure plate (410) is provided with two guide grooves, the two guide grooves are arranged in a one-to-one correspondence with the vertical plates (421), and the guide grooves are guided and matched with the vertical plates (421), and the guide grooves form the guide structure.

9. The high-pressure isolation valve according to claim 1, characterized in that The pressure plate (410) has a connecting hole, and the valve stem (200) is inserted into the pressure plate (410) through the connecting hole. An extrusion boss (411) is provided in an annular shape on the outer periphery of the port of the connecting hole facing the stuffing box (310). The extrusion boss (411) is used to abut against the stuffing box (310). The diameter of the end face of the extrusion boss (411) facing the stuffing box (310) is adapted to the diameter of the stuffing box (310).

10. The high-pressure isolation valve according to claim 9, characterized in that The extrusion boss (411) comprises a conical section (4111) and a straight section (4112) connected to each other, the straight section (4112) being provided on the side of the conical section (4111) away from the pressure plate (410), and the diameter of the conical section (4111) gradually decreases towards the direction approaching the straight section (4112).

Images