Medium-pressure main throttle valve adjusting structure
The design of the limit and buffer mechanism solves the problem of positional deviation caused by valve stem rotation, improves the accuracy of medium-pressure main steam valve regulation and system stability, and prevents equipment damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-09
- Publication Date
- 2026-04-07
AI Technical Summary
The traditional medium-pressure main steam valve regulating structure lacks limiting measures, causing the valve stem to rotate or shift position after the opening adjustment is completed, affecting the flow regulation accuracy and system stability.
The design incorporates a limiting mechanism and a buffer mechanism. The limiting mechanism uses end caps, sliders, and circular plates to fix the valve stem position, while the buffer mechanism uses a spiral flow channel to disperse the steam kinetic energy and reduce eddies and fluctuations.
It improves the valve stem adjustment accuracy, prevents position deviation, reduces eddies and fluctuations, avoids equipment damage, and ensures stable system operation.
Smart Images
Figure CN224093841U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medium-pressure main steam valve technology, specifically to a medium-pressure main steam valve adjustment structure. Background Technology
[0002] The intermediate-pressure main steam valve is an important component of the steam turbine system. It is mainly used to control the steam flow from the boiler to the steam turbine. It is usually located between the boiler and the steam turbine and is responsible for regulating and limiting the steam pressure and flow entering the intermediate-pressure steam pipeline.
[0003] Currently, in the traditional main steam valve regulating structure design, accurate adjustment of the valve stem is crucial for the normal operation of the valve. However, due to the lack of effective limiting measures, the valve stem may rotate or shift position after the opening adjustment is completed. This rotation or shift leads to inaccurate valve core position, which in turn affects the flow regulation accuracy and the stability of system operation.
[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Utility Model Content
[0005] The purpose of this invention is to address the aforementioned shortcomings and provide a medium-pressure main steam valve adjustment structure.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a medium-pressure main steam valve regulating structure, including a valve stem disposed in the valve body for controlling the valve core opening, and an end cap disposed on the valve stem and at the bottom of the valve body;
[0007] A limiting mechanism is movably mounted on the valve stem to limit the position of the valve stem at the outer end of the end cover.
[0008] A buffer mechanism is housed within the valve body and enclosed outside the valve core. It is used to disperse the kinetic energy of the steam entering the valve body and reduce eddies and sudden fluctuations in the steam flow.
[0009] Furthermore, the outer wall of the valve stem has two symmetrically distributed axial grooves. The limiting mechanism includes a first circular plate sleeved on the outside of the valve stem and a slider symmetrically arranged on the inner wall of the first circular plate and adapted to move in the groove. The outer wall of the valve stem has two sets of circumferential arc grooves that communicate with the grooves.
[0010] Each group of circumferential arc grooves has two symmetrically arranged on the same horizontal plane on the valve stem, and the two circumferential arc grooves are respectively connected to the corresponding sliding groove.
[0011] Furthermore, a second circular plate is coaxially and rotatably mounted on the outer wall of the first circular plate. Two symmetrical limiting blocks are provided on the second circular plate corresponding to the end face of the end cap. Two vertical grooves for inserting the limiting blocks are symmetrically provided on the end cap. An arc groove for limiting the rotation of the limiting blocks is provided on the side of the vertical groove.
[0012] Furthermore, the buffer mechanism includes a support ring surrounding the valve core and a spiral flow channel opened at the circumferential support end of the support ring. The starting end of the spiral flow channel and the outer side of the support ring are provided with a transversely penetrating outer inlet, and the inner side of the support ring is provided with several inner outlets distributed along the path of the spiral flow channel.
[0013] The air inlet ends of several of the internal outlets are all connected to the spiral flow channel.
[0014] Furthermore, the inner wall of the support ring is provided with filters that are externally wrapped around the valve core.
[0015] Furthermore, the end cap is fixed to the bottom of the valve body with bolts.
[0016] Compared with the prior art, this utility model has the following beneficial effects: The limiting mechanism of this utility model can limit and fix the valve stem after the valve core opening is adjusted, preventing the valve stem from rotating and thus preventing the valve stem from moving, improving adjustment accuracy. Furthermore, the buffer mechanism can disperse the kinetic energy of the steam entering the valve body, reducing eddies and sudden fluctuations in the steam flow. Preheating the main steam valve can balance the temperature of the valve core, thereby avoiding sharp pressure fluctuations during operation and reducing the risk of equipment damage. Attached Figure Description
[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:
[0018] Figure 1 This is a perspective view of the cross-section of the valve body according to an embodiment of the present invention.
[0019] Figure 2 This is a perspective view of the relevant structures on the valve stem according to an embodiment of the present invention.
[0020] Figure 3 This is a perspective view of the related structures on the valve stem according to an embodiment of the present invention.
[0021] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle;
[0022] Figure 5 This is a perspective view of a partial cross-section of the buffer mechanism according to an embodiment of the present invention.
[0023] In the diagram: 100, valve body; 101, valve core; 102, valve stem; 1, end cap; 2, limiting mechanism; 21, first circular plate; 211, slider; 22, second circular plate; 221, limiting block; 3, buffer mechanism; 31, support ring; 32, spiral flow channel; 33, outer inlet; 34, inner outlet; 4, slide groove; 5, circumferential arc groove; 6, vertical groove; 61, arc groove. Detailed Implementation
[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0025] like Figure 1-5 As shown, the medium-pressure main steam valve adjustment structure of this utility model includes a valve stem 102 disposed inside the valve body 100 for controlling the opening of the valve core 101, and an end cap 1 is disposed on the valve stem 102 and at the bottom of the valve body 100.
[0026] The limiting mechanism 2 is movably disposed on the valve stem 102 and is used to limit the position of the valve stem 102 at the outer end of the end cover 1.
[0027] The buffer mechanism 3 is housed inside the valve body 100 and outside the valve core 101, and is used to disperse the kinetic energy of the steam introduced into the valve body 100, thereby reducing eddies and sudden fluctuations in the steam flow.
[0028] In specific implementation, the end cap 1 installed at the bottom of the valve body 100 through the valve stem 102 and the limiting mechanism 2 movably installed on the valve stem 102, when used in conjunction with the end face of the end cap 1, can limit and fix the valve stem 102 after the valve core 101 opening is adjusted, thus preventing the valve stem 102 from rotating and thus preventing the position of the valve stem 102 from moving, thereby improving the adjustment accuracy.
[0029] The buffer mechanism 3 installed on the outside of the valve core 101 can disperse the kinetic energy of the steam, reduce eddies and sudden fluctuations in the flow, and preheat the main steam valve to balance the temperature of the valve core 101, thus avoiding damage to the equipment structure due to temperature differences.
[0030] In one embodiment, the outer wall of the valve stem 102 is symmetrically provided with two axially distributed sliding grooves 4. The limiting mechanism 2 includes a first circular plate 21 sleeved on the outside of the valve stem 102 and a slider 211 symmetrically arranged on the inner wall of the first circular plate 21 and adapted to move in the sliding grooves 4. The outer wall of the valve stem 102 is provided with two sets of circumferential arc grooves 5 that communicate with the sliding grooves 4.
[0031] Each set of circumferential arc grooves 5 is symmetrically arranged in two on the same horizontal plane on the valve stem 102, and the two circumferential arc grooves 5 are respectively connected to the corresponding sliding grooves 4. With this design, by installing a first circular plate 21 on the outside of the valve stem 102 and two sliders 211 symmetrically welded to the inner wall of the first circular plate 21, when an external force is applied along the axial direction of the valve stem 102 to drive the valve stem 102 to control the opening of the internal valve core 101, the sliders 211 will slide relative to each other in the two axially distributed sliding grooves 4 that are symmetrically machined on the outside of the valve stem 102, so that the limiting mechanism 2 is located in the circumferential arc groove 5 machined on the outer wall of the valve stem 102 and placed on the outer side. At this time, rotating the first circular plate 21 causes the sliders 211 to rotate circumferentially in the corresponding circumferential arc grooves 5, limiting the position of the limiting mechanism 2 installed on the valve stem 102 to be close to the end face of the end cover 1, and preventing the valve stem 102 from moving.
[0032] It should be noted that the positions of the two sets of circumferential arc grooves 5 on the valve stem 102 correspond to the closing point and opening point of the valve core 101, respectively.
[0033] In one embodiment, a second circular plate 22 is coaxially and rotatably disposed on the outer wall of the first circular plate 21. Two symmetrical limiting blocks 221 are disposed on the second circular plate 22 corresponding to the end face of the end cap 1. Two vertical grooves 6 for inserting the limiting blocks 221 are symmetrically disposed on the end cap 1. An arc groove 61 for limiting the rotation of the limiting blocks 221 is disposed on the side of the vertical groove 6. With this design, the second circular plate 22, which is installed in phase within the guide rail machined on the outer side of the first circular plate 21, and two symmetrical limiting blocks 221 welded to the end face of the corresponding end cap 1 on the second circular plate 22, rotate relative to the first circular plate 21 after the valve stem 102 is limited to the limiting mechanism 2. This causes the limiting blocks 221 and the vertical groove 6 to be placed on the same center line. At this time, the limiting mechanism 2 moves axially along with the valve stem 102, so that the limiting blocks 221 are inserted into the vertical groove 6 machined on the end cap 1. The second circular plate 22 is rotated again, so that the limiting blocks 221 rotate in the arc groove 61 machined on one side of the vertical groove 6. This limits the valve stem 102 to the end face of the end cap 1, effectively preventing the valve stem 102 from rotating.
[0034] In one embodiment, the buffer mechanism 3 includes a support ring 31 surrounding the valve core 101 and a spiral flow channel 32 formed at the circumferential support end of the support ring 31. The starting end of the spiral flow channel 32 and the outer side of the support ring 31 are provided with a transversely penetrating outer inlet 33. The inner side of the support ring 31 is provided with a plurality of inner outlets 34 distributed along the path of the spiral flow channel 32.
[0035] The air inlet ends of several inner outlets 34 are all connected to the spiral flow channel 32. This design allows steam entering the valve body 100 via the outer support ring 31, the spiral flow channel 32 machined axially along the inner support end of the support ring 31, and the outer inlet 33 machined laterally at the starting position of the corresponding spiral flow channel 32 on the outer side of the support ring 31. This disperses the kinetic energy of the steam, reduces eddies and sudden fluctuations in the flow, and preheats the main steam valve, balancing the temperature of the valve core 101 and preventing damage to the equipment structure due to temperature differences.
[0036] In one embodiment, the inner wall of the support ring 31 is provided with filters that are spaced apart from the valve core 101. This design allows for the effective filtration of impurities in the steam through the filters spaced apart on the inner wall of the support ring 31.
[0037] In one embodiment, the end cap 1 is fixed to the bottom of the valve body 100 by bolts. This design allows the end cap 1 to be installed at the bottom of the valve body 100 by screwing in the two internally threaded holes machined on the end cap 1, enabling periodic disassembly for regular maintenance of the internal structure.
[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
[0039] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "several" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
Claims
1. A medium-pressure main steam valve regulating structure, comprising a valve stem (102) disposed within a valve body (100) for controlling the opening degree of a valve core (101), characterized in that: An end cap (1) is provided on the valve stem (102) and at the bottom of the valve body (100); The limiting mechanism (2) is movably disposed on the valve stem (102) and is used to limit the position of the valve stem (102) at the outer end of the end cap (1); The buffer mechanism (3) is housed inside the valve body (100) and outside the valve core (101), and is used to disperse the kinetic energy of the steam introduced into the valve body (100) to reduce eddies and sudden fluctuations in the steam flow.
2. The medium-pressure main steam valve regulating structure according to claim 1, characterized in that: The valve stem (102) has two axially distributed grooves (4) symmetrically opened on its outer wall. The limiting mechanism (2) includes a first circular plate (21) sleeved on the outside of the valve stem (102) and a slider (211) symmetrically arranged on the inner wall of the first circular plate (21) and adapted to move in the groove (4). The valve stem (102) has two sets of circumferential arc grooves (5) parallel to the groove (4) and connected to them. Two circumferential arc grooves (5) are symmetrically arranged on the same horizontal plane on the valve stem (102) in each group, and the two circumferential arc grooves (5) are respectively connected to the corresponding slide grooves (4).
3. The medium-pressure main steam valve regulating structure according to claim 2, characterized in that: The outer wall of the first circular plate (21) is coaxially and rotatably provided with a second circular plate (22). The second circular plate (22) is provided with two symmetrical limiting blocks (221) corresponding to the end face of the end cap (1). The end cap (1) is provided with two vertical grooves (6) symmetrically for the insertion of the limiting blocks (221). The side of the vertical groove (6) is connected to an arc groove (61) for the rotation limit of the limiting block (221).
4. The medium-pressure main steam valve regulating structure according to claim 1, characterized in that: The buffer mechanism (3) includes a support ring (31) wrapped around the valve core (101) and a spiral flow channel (32) opened on the circumferential support end of the support ring (31). The starting end of the spiral flow channel (32) and the outside of the support ring (31) are provided with a transversely penetrating outer inlet (33). The inner side of the support ring (31) is provided with several inner outlets (34) distributed along the path of the spiral flow channel (32). The air inlet ends of several of the inner outlets (34) are all connected to the spiral flow channel (32).
5. The medium-pressure main steam valve regulating structure according to claim 4, characterized in that: The inner wall of the support ring (31) is provided with filters that are wrapped around the valve core (101) at intervals.
6. The medium-pressure main steam valve regulating structure according to claim 1, characterized in that: The end cap (1) is fixed to the bottom of the valve body (100) with bolts.