Regulating valve and steam turbine

Abstract

The regulating valve comprises a cross-shaped sleeve, a limiting assembly and a stop plate, the cross-shaped sleeve is provided with a valve cavity, one end of a valve rod is arranged in the valve cavity, the valve rod is sleeved with the limiting assembly, the limiting assembly is located in the valve cavity, and the stop plate is connected with the cross-shaped sleeve. The stop plate comprises a first stop part, a second stop part and a third stop part, at least parts of the first stop part, the second stop part and the third stop part abut against the valve rod, and an included angle is formed between the extending direction of the first stop part and the extending direction of the second stop part. And an included angle is formed between the extending direction of the second stop part and the extending direction of the third stop part. The regulating valve has the advantages of being high in impact resistance and not prone to damage.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine regulating valves, in particular to a regulating valve and a steam turbine. Background Art

[0002] As a valve for regulating steam supply to the high-pressure cylinder of a steam turbine, the regulating valve is used to adjust the speed of the steam turbine during startup and to adjust the load of the steam turbine during load. As the unit is put into operation for a longer period of time, problems such as load fluctuations and the inability of the regulating valve to adjust continuously are prone to occur.

[0003] During use, the valve core assembly in the related technology is subjected to the strong impact force of the steam flow (steam flow pressure exceeds 16MPa) and the alternating stress of temperature (from ambient temperature to 538 degrees), which causes load fluctuations in the regulating valve and the inability to continuously adjust the regulating valve. The stop plate is deformed under the influence of the positive and negative impact forces of the regulating valve stem and fails to stop the valve stem, causing damage to the connecting thread of the regulating valve stem and the fall of the valve stem, resulting in the unit being unable to operate normally, causing the unit to reduce load or even shut down. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the utility model provides a regulating valve, which has the advantages of strong impact resistance and not easy to be damaged.

[0005] The regulating valve of the embodiment of the utility model comprises:

[0006] A cross sleeve, wherein the cross sleeve has a valve cavity, and one end of the valve stem is placed in the valve cavity;

[0007] A limit assembly, wherein the limit assembly is sleeved on the valve stem and is located in the valve cavity;

[0008] A stop plate, the stop plate is connected to the cross sleeve, the stop plate includes a first stop portion, a second stop portion and a third stop portion, at least parts of the first stop portion, the second stop portion and the third stop portion abut against the valve stem, an extension direction of the first stop portion and an extension direction of the second stop portion have an angle therebetween, and an extension direction of the second stop portion and an extension direction of the third stop portion have an angle therebetween.

[0009] The regulating valve limit assembly and the stop plate of the embodiment of the utility model form a limit effect on the valve stem, and the stop plate can stop the valve stem on three sides through the first stop part, the second stop part and the third stop part, further enhancing the stopping force and increasing the stability of the regulating valve.

[0010] In some embodiments, an extension direction of the first stopping portion is orthogonal to an extension direction of the second stopping portion, and an extension direction of the second stopping portion is orthogonal to an extension direction of the third stopping portion.

[0011] In some embodiments, the stop plate also includes a first arc-shaped portion and a second arc-shaped portion, the first arc-shaped portion is connected between the first stop portion and the second stop portion, the second arc-shaped portion is connected between the second stop portion and the third stop portion, the first arc-shaped portion has a first arc-shaped surface, the second arc-shaped portion has a second arc-shaped surface, and the first arc-shaped surface and the second arc-shaped surface both protrude in a direction away from the valve stem.

[0012] In some embodiments, the stop plate further includes an avoidance groove, and the avoidance groove is opened on the bottom wall surface of the stop plate.

[0013] In some embodiments, the width of the avoidance groove is greater than the diameter of the valve stem and smaller than the diameter of the valve cavity.

[0014] In some embodiments, in the length direction of the valve stem, the stop plate includes an avoidance section and a fastening section, the ratio of the thickness of the fastening section to the thickness of the avoidance section is greater than or equal to 5, the avoidance groove is arranged in the avoidance section, and the first stop portion, the second stop portion and the third stop portion are arranged in the fastening section.

[0015] In some embodiments, the avoidance groove includes a first groove section and a second groove section, the second groove section is located on a side of the first groove section away from the cross sleeve, and the width of the first groove section is greater than the width of the second groove section.

[0016] In some embodiments, the limit assembly includes a first limit sleeve and a second limit sleeve, the first limit sleeve and the second limit sleeve are both mounted on the valve stem, and the first limit sleeve is arranged adjacent to the bottom of the valve cavity, the first end of the second limit sleeve is against the first limit sleeve, and the second end of the second limit sleeve is against the stop plate.

[0017] In some embodiments, the limiting assembly further includes a first reinforcing member and a second reinforcing member, both of which are connected to the cross sleeve, and one end of the first reinforcing member abuts against the peripheral wall of the first limiting sleeve, and one end of the second reinforcing member abuts against the second limiting sleeve.

[0018] The steam turbine of the embodiment of the utility model comprises a plurality of high-pressure regulating valves, and the high-pressure regulating valves are regulating valves according to any one of the above-mentioned embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a partial structural schematic diagram of a regulating valve according to an embodiment of the utility model.

[0020] Figure 2 It is a structural schematic diagram of a stop plate of a regulating valve according to an embodiment of the utility model.

[0021] Figure 3 It is a schematic cross-sectional structure diagram of a stop plate of a regulating valve according to an embodiment of the utility model.

[0022] Reference numerals:

[0023] 100. Valve stem,

[0024] 1. Cross sleeve, 11. Valve chamber,

[0025] 2. Limiting assembly, 21. First limiting sleeve, 22. Second limiting sleeve, 23. First reinforcing member, 24. Second reinforcing member,

[0026] 3. Stop plate, 31. Fastening section, 311. First stop portion, 312. Second stop portion, 313. Third stop portion, 314. First arc-shaped portion, 315. Second arc-shaped portion, 32. Avoidance section, 321. Avoidance groove, 3211. First groove section, 3212. Second groove section. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0028] like Figure 1-Figure 3 As shown, the regulating valve of the embodiment of the utility model comprises: a cross sleeve 1, a limit assembly 2 and a stop plate 3.

[0029] The cross sleeve 1 has a valve cavity 11, and one end of the valve stem 100 is placed in the valve cavity 11. The limit assembly 2 is sleeved on the valve stem 100, and the limit assembly 2 is located in the valve cavity 11. The stop plate 3 is connected to the cross sleeve 1, and the stop plate 3 includes a first stop portion 311, a second stop portion 312 and a third stop portion 313. At least part of the first stop portion 311, the second stop portion 312 and the third stop portion 313 abut against the valve stem 100, and an angle is formed between the extension direction of the first stop portion 311 and the extension direction of the second stop portion 312, and an angle is formed between the extension direction of the second stop portion 312 and the extension direction of the third stop portion 313.

[0030] Specifically, Figure 1-Figure 3As shown, the cross sleeve 1 extends in the left-right direction, the opening of the valve cavity 11 faces the right side, and the extension direction of the valve cavity 11 is consistent with the left-right direction. The limit assembly 2 is sleeved on the valve stem 100 and is located in the valve cavity 11 of the cross sleeve 1, so as to increase the overall stopping force when it rotates under positive and negative impact forces. The stop plate 3 and the cross sleeve 1 can be connected by welding, or by bolts, screws, etc. The first stop portion 311, the second stop portion 312 and the third stop portion 313 are all against the valve stem 100, so as to stop the valve stem 100 in multiple directions of the valve stem 100.

[0031] It is understandable that the stop plate 3 is connected to the cross sleeve 1 by welding, and its material can be selected from materials that are easy to weld, have high strength and good toughness, such as medium carbon low alloy structural steel (35CrMoA), which not only increases strength, but also increases wear resistance and toughness. The angle between the first stop portion 311 and the second stop portion 312 and the angle between the second stop portion 312 and the third stop portion 313 can be adjusted according to the size, inclination angle and other parameters of the valve stem 100, so that the stop plate 3 can be against the valve stem 100, so that the stop plate 3 can stop the valve stem 100 on three sides.

[0032] Preferably, if Figure 1 As shown, the extension direction of the first stop portion 311 is orthogonal to the extension direction of the second stop portion 312 , and the extension direction of the second stop portion 312 is orthogonal to the extension direction of the third stop portion 313 .

[0033] It can be understood that the first stopper 311 and the third stopper 313 extend in the same direction, and the second stopper 312 is orthogonal to the first stopper 311 and the third stopper 313. That is, the shape formed by the first stopper 311, the second stopper 312 and the third stopper 313 is generally U-shaped, which facilitates the cooperation between the stopper plate 3 and the valve stem 100, thereby realizing the three-sided stop function of the stopper plate 3 on the valve stem 100.

[0034] In other words, the regulating valve limit assembly 2 and the stop plate 3 of the embodiment of the utility model form a limiting effect on the valve stem 100, and the stop plate 3 can stop the valve stem 100 on three sides through the first stop portion 311, the second stop portion 312 and the third stop portion 313, thereby further enhancing the stopping force and increasing the stability of the regulating valve.

[0035] Therefore, the regulating valve structure of the embodiment of the utility model is simple, easy to manufacture and maintain, and the stopping force effect is improved through the angle between the orthogonal stop parts, so it can adapt to the high pressure and high temperature working environment, has good durability and reliability, and is also easy to install, and can be applicable to regulating valves of different models and specifications.

[0036] In some embodiments, the stop plate 3 also includes a first arc portion 314 and a second arc portion 315, the first arc portion 314 is connected between the first stop portion 311 and the second stop portion 312, the second arc portion 315 is connected between the second stop portion 312 and the third stop portion 313, the first arc portion 314 has a first arc surface, the second arc portion 315 has a second arc surface, and both the first arc surface and the second arc surface protrude in a direction away from the valve stem 100.

[0037] It is understandable that if Figure 2 and Figure 3 As shown, the first arc portion 314 connected between the first stop portion 311 and the second stop portion 312 is a smoothly transitioned corner, and the second arc portion 315 connected between the second stop portion 312 and the third stop portion 313 is a smoothly transitioned corner, thereby reducing the stress concentration phenomenon caused by the sudden change in shape, helping to improve the strength and durability of the structure and preventing fatigue cracks caused by stress concentration.

[0038] In some embodiments, the stop plate 3 further includes an avoidance groove 321, and the avoidance groove 321 is opened on the bottom wall surface of the stop plate 3. It can be understood that Figure 1 and 3 As shown, the opening of the avoidance groove 321 is arranged adjacent to the cross sleeve 1 , and the existence of the avoidance groove 321 can provide an avoidance space for the limiting assembly 2 .

[0039] Preferably, the width of the avoidance groove 321 is greater than the diameter of the valve stem 100 and less than the diameter of the valve cavity 11. In other words, if the width of the avoidance groove 321 is too large, it will affect the overall strength of the stop plate 3, and if the width of the avoidance groove 321 is too small, the stop plate 3 will not provide enough avoidance space.

[0040] In some embodiments, in the length direction of the valve stem 100, the stop plate 3 includes an avoidance section 32 and a fastening section 31, the ratio of the thickness of the fastening section 31 to the thickness of the avoidance section 32 is greater than or equal to 5, the avoidance groove 321 is provided in the avoidance section 32, and the first stop portion 311, the second stop portion 312 and the third stop portion 313 are provided in the fastening section 31.

[0041] It is understandable that if Figure 1 and Figure 3 As shown, the avoidance section 32 is arranged adjacent to the cross sleeve 1, the avoidance groove 321 can provide an avoidance space for the cross sleeve 1 or the limiting assembly 2, and the first stopper 311, the second stopper 312 and the third stopper 313 are all located at the end of the stop plate 3 away from the cross sleeve 1. The thickness of the fastening section 31 is much greater than the thickness of the avoidance section 32, so that the overall thickness of the stop plate 3 can be maintained within a certain range, thereby ensuring the stopping function of the stop plate 3.

[0042] Preferably, the avoidance groove 321 includes a first groove section 3211 and a second groove section 3212, the second groove section 3212 is located on the side of the first groove section 3211 away from the cross sleeve 1, and the width of the first groove section 3211 is greater than the width of the second groove section 3212. It can be understood that the first groove section 3211 is arranged closer to the cross sleeve 1 than the second groove section 3212 to provide an avoidance space. The existence of the second groove section 3212 can increase the cross-sectional area of ​​the avoidance groove 321 away from the cross sleeve 1, thereby improving the bearing capacity of the avoidance groove 321, and the width of the second groove section 3212 is less than the width of the first groove section 3211, which improves the mechanical properties of the avoidance groove 321, such as bending lightness, torsional strength, etc., so that it has better stability and reliability when subjected to external loads.

[0043] In some embodiments, the limit assembly 2 includes a first limit sleeve 21 and a second limit sleeve 22, both of which are mounted on the valve stem 100, and the first limit sleeve 21 is arranged adjacent to the bottom of the valve cavity 11, the first end of the second limit sleeve 22 is against the first limit sleeve 21, and the second end of the second limit sleeve 22 is against the stop plate 3.

[0044] Specifically, Figure 1 As shown, the first limiting sleeve 21 has an internal thread, and the left end of the valve stem 100 has an external thread, and the first limiting sleeve 21 and the left end of the valve stem 100 can be matched by threads. Preferably, the left end of the first limiting sleeve 21 also has a transition hole, and the aperture of the transition hole is larger than the diameter of the valve stem 100, so that after the first limiting sleeve 21 is matched with the valve stem 100, there is a certain gap between the left end side wall of the first limiting sleeve 21 and the valve stem 100, and when the valve stem 100 is displaced, it is avoided that the left end of the first limiting sleeve 21 collides with the inner wall of the cross sleeve 1 and causes damage to the cross sleeve 1. The inner wall surface of the second limiting sleeve 22 contacts the wall surface of the valve stem 100, and the outer wall surface of the second limiting sleeve 22 can be connected to the inner wall surface of the right end of the cross sleeve 1 by threads to ensure the connection strength.

[0045] Preferably, the limiting assembly 2 further includes a first reinforcing member 23 and a second reinforcing member 24, both of which are connected to the cross sleeve 1, and one end of the first reinforcing member 23 abuts against the peripheral wall of the first limiting sleeve 21, and one end of the second reinforcing member 24 abuts against the second limiting sleeve 22. Figure 1 As shown, the wall surface of the cross sleeve 1 is provided with a first fixing hole and a second fixing hole, one end of the first reinforcing member 23 can pass through the first fixing hole and abut against the wall surface of the first limiting sleeve 21 to achieve the function of reinforcing the first fixing sleeve, and one end of the second reinforcing member 24 can pass through the second reinforcing hole and abut against the wall surface of the second limiting sleeve 22 to achieve the function of reinforcing the second fixing sleeve.

[0046] Optionally, the first reinforcement member 23 may be a pin, and the first reinforcement member 23 and the first reinforcement hole are in interference fit. The second reinforcement member 24 may be a screw, and the second reinforcement hole is a threaded hole, and the second reinforcement member 24 and the second reinforcement hole are in threaded fit.

[0047] The steam turbine of the embodiment of the utility model includes a plurality of high-pressure regulating valves, and the high-pressure regulating valve is a regulating valve according to any one of the above embodiments. It can be understood that the high-pressure regulating valve is a valve used for regulating the steam supply to the high-pressure cylinder of the steam turbine, and is used to regulate the rotation of the steam turbine during startup and to regulate the load of the steam turbine during load. Therefore, valve failure is an important cause of loss. Therefore, the regulating valve of the steam turbine of the embodiment of the utility model can continuously control the load, preventing load fluctuations and shutdowns. In addition, the cross sleeve 1 of the regulating valve has a low probability of damage, ensuring the safe operation of the unit.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0053] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A regulating valve, characterized in that: include: A cross sleeve, wherein the cross sleeve has a valve cavity, and one end of the valve stem is placed in the valve cavity; A limit assembly, wherein the limit assembly is sleeved on the valve stem and is located in the valve cavity; A stop plate, the stop plate is connected to the cross sleeve, the stop plate includes a first stop portion, a second stop portion and a third stop portion, at least parts of the first stop portion, the second stop portion and the third stop portion abut against the valve stem, an extension direction of the first stop portion and an extension direction of the second stop portion have an angle therebetween, and an extension direction of the second stop portion and an extension direction of the third stop portion have an angle therebetween.

2. The regulating valve according to claim 1, characterized in that: An extending direction of the first stop portion is orthogonal to an extending direction of the second stop portion, and an extending direction of the second stop portion is orthogonal to an extending direction of the third stop portion.

3. The regulating valve according to claim 2, characterized in that: The stop plate also includes a first arc-shaped portion and a second arc-shaped portion, the first arc-shaped portion is connected between the first stop portion and the second stop portion, the second arc-shaped portion is connected between the second stop portion and the third stop portion, the first arc-shaped portion has a first arc-shaped surface, the second arc-shaped portion has a second arc-shaped surface, and the first arc-shaped surface and the second arc-shaped surface both protrude in a direction away from the valve stem.

4. The regulating valve according to claim 3, characterized in that: The stop plate further includes an avoidance groove, which is arranged on the bottom wall surface of the stop plate.

5. The regulating valve according to claim 4, characterized in that: The width of the avoidance groove is greater than the diameter of the valve stem and smaller than the diameter of the valve cavity.

6. The regulating valve according to claim 4, characterized in that: In the length direction of the valve stem, the stop plate includes an avoidance section and a fastening section, the ratio of the thickness of the fastening section to the thickness of the avoidance section is greater than or equal to 5, the avoidance groove is arranged in the avoidance section, and the first stop portion, the second stop portion and the third stop portion are arranged in the fastening section.

7. The regulating valve according to claim 6, characterized in that: The avoidance groove includes a first groove section and a second groove section, the second groove section is located on a side of the first groove section away from the cross sleeve, and the width of the first groove section is greater than the width of the second groove section.

8. The regulating valve according to any one of claims 1 to 7, characterized in that: The limiting assembly includes a first limiting sleeve and a second limiting sleeve, the first limiting sleeve and the second limiting sleeve are both mounted on the valve stem, and the first limiting sleeve is arranged adjacent to the bottom of the valve cavity, the first end of the second limiting sleeve abuts against the first limiting sleeve, and the second end of the second limiting sleeve abuts against the stop plate.

9. The regulating valve according to claim 8, characterized in that: The limiting assembly also includes a first reinforcing member and a second reinforcing member, both of which are connected to the cross sleeve, and one end of the first reinforcing member abuts against the peripheral wall of the first limiting sleeve, and one end of the second reinforcing member abuts against the second limiting sleeve.

10. A steam turbine, characterized in that: The steam turbine comprises a plurality of high-pressure regulating valves, and the high-pressure regulating valves are regulating valves according to any one of claims 1-9.

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