Steam turbine auxiliary engine drainage device and drainage regulating valve assembly

Abstract

The utility model discloses a steam turbine auxiliary engine drainage device and drainage regulating valve assembly, which comprises a valve core with a hollow cylinder structure, a plurality of integrally through window-shaped through holes are uniformly distributed in the circumferential direction of the bottom of the valve core, and each window-shaped through hole is provided with an involute part of which the opening degree is gradually increased along the opening direction of a drainage regulating valve. The drain regulating valve has the advantages that due to the fact that the specific window-shaped through hole design is adopted, the through-flow area of each through hole is increased, and the opening degree of each through hole is gradually increased along with the opening direction of the drain regulating valve, the design can guarantee that the flow characteristic of the drain regulating valve is not changed, blocking is not prone to occurring, the time for stopping a high-pressure heater is shortened, and the service life of the high-pressure heater is prolonged. The economical efficiency of a unit is improved, and meanwhile, the scalding risk when personnel clean the valve element is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure heater drain systems in the power industry, and more specifically, to a drain device for turbine auxiliaries and a drain regulating valve assembly. Background Art

[0002] Currently, the normal drain valves of high-pressure heaters in each power plant are usually regulating valves. The valve core consists of multiple layers of through-flow holes with a diameter of φ1 - φ8 mm from top to bottom, and the holes are arranged in a staggered manner, as shown in the appendix. Figure 1 When the valve is in the fully closed state, the valve core and the valve seat are completely sealed, and at this time, all the small holes on the valve core do not allow flow; when the valve is in the fully open state, the valve core moves upward to the maximum position, that is, all the through-flow holes on the valve core allow flow; when the valve is opened from the closed state, the valve core gradually moves upward, and the through-flow holes with a diameter of φ1 - φ8 on the valve core allow flow in sequence from small to large, and the drain amount is adjusted by the size of the valve opening.

[0003] With the change of the unit load, when the high-pressure heater drain valve operates normally for about 30 days, these through-flow holes on the valve core are mostly fouled and blocked due to the attachment of impurities in the drain water, resulting in poor drainage of the high-pressure heater. Even when the valve is fully open, the water level of the high-pressure heater still continues to rise. To avoid the continuous rise of the high-pressure heater water level and ensure the normal water level of the high-pressure heater, it is necessary to open the emergency drain regulating valve of the high-pressure heater to discharge part of the drain water to the condenser, which not only increases the heat load of the condenser, but also causes a large amount of drain heat to be carried away by the circulating water; in addition, when cleaning the valve core, it is necessary to shut down the high-pressure heater, which increases the risk of scalding during personnel work and reduces the economy of the unit. Summary of the Utility Model

[0004] Aiming at the defects in the prior art, the utility model provides a drain device for turbine auxiliaries and a drain regulating valve assembly, in which a number of window-shaped through-flow holes are opened on the valve core. The through-flow area of each through-flow hole is increased, which is not easy to be blocked, and the flow characteristics remain unchanged. The time for shutting down the high-pressure heater is reduced, the economy of the unit is improved, and at the same time, the risk of scalding during personnel cleaning of the valve core is reduced.

[0005] To achieve the above purpose, the specific technical solutions adopted by the utility model are as follows:

[0006] A drain device for turbine auxiliaries includes a valve core in a hollow cylindrical structure, and the key lies in that: a number of integrally-through window-shaped through-holes are uniformly distributed on the circumferential direction of the bottom of the valve core, and the window-shaped through-holes have an involute part with an increasing opening degree along the opening direction of the drain regulating valve.

[0007] Furthermore, the orthographic projection image of the window-shaped through hole is a bottle-shaped closed figure, whose contour curve includes a straight segment, the left and right ends of the straight segment are respectively connected to the lower ends of the left and right vertical segments by a smooth transition through a first arc segment, the upper ends of the left and right vertical segments are respectively connected to the lower ends of the left and right third arc segments by a smooth transition through a second arc segment, and the upper ends of the left and right third arc segments are connected by a smooth transition through a fourth arc segment.

[0008] Furthermore, the radius of the arc surface where the first arc segment and the second arc segment are located is 3mm, the radius of the arc surface where the third arc segment is located is 58mm, the radius of the arc surface where the fourth arc segment is located is 0.5mm, the spacing between the left and right vertical segments is 18mm, the height difference between the vertex of the fourth arc segment and the straight segment is 58mm, and the height difference between the vertex of the fourth arc segment and the vertex of the vertical segment is 30mm.

[0009] Furthermore, a limiting flange adapted to the valve seat of the hydrophobic regulating valve is formed on the outer circumferential surface of the valve core above the window-shaped through hole.

[0010] Furthermore, the height difference between the low point of the limiting flange and the top point of the fourth arc segment is 2 mm, and the height difference between the straight segment and the low point of the valve core is 9 mm.

[0011] Furthermore, an air hole communicating with the cylinder cavity is provided at the cylinder top of the valve core, and a valve stem interface is reserved at the center of the cylinder top of the valve core.

[0012] Furthermore, the outer circumferential surface of the upper portion of the valve core is indented to form at least one annular groove adapted to the sealing ring.

[0013] Based on the above structure, a drain regulating valve assembly includes a valve body and a valve cover installed on the valve body through a door cover gasket, bolts and nuts, the inlet section of the valve body is connected to an inlet connecting pipe, the outlet section of the valve body is connected to an outlet connecting pipe, and a valve seat is also arranged between the inlet section and the outlet section of the valve body. The key lies in: a valve stem is connected to the valve cover through a first guide sealing structure, the valve stem penetrates the valve cover and extends toward the valve body, and the turbine auxiliary machine drain device described above is connected at its end through a pin, a guide groove for axial movement of the turbine auxiliary machine drain device is also opened at the bottom of the valve cover, and a second guide sealing structure is also arranged between the groove wall of the guide groove and the turbine auxiliary machine drain device.

[0014] Furthermore, a valve frame is arranged on the valve cover via a lock nut, and an opening and closing actuator connected to the head end of the valve stem is arranged on the valve frame.

[0015] Furthermore, the first guiding and sealing structure includes a first gland, a second gland, a gasket, a first graphite ring, a graphite rope, and a second graphite ring that are sequentially arranged in the lock nut; the second guiding and sealing structure includes a guide sleeve and a valve sleeve provided between the groove wall of the guiding groove and the steam turbine auxiliary equipment drain device, and a first sealing ring and a second sealing ring provided between the guide sleeve and the steam turbine auxiliary equipment drain device.

[0016] Compared with the prior art, the remarkable effects of the present utility model are as follows:

[0017] (1) Since the steam turbine auxiliary equipment drain device of the present utility model adopts a specific window-shaped through-hole design, the flow area of each through-hole is increased, and its opening degree increases with the opening direction of the drain regulating valve. Such a design can not only ensure the unchanged flow characteristics of the drain regulating valve, but also is not prone to blockage, reduces the shutdown time of the high-pressure heater, improves the economy of the unit, and at the same time reduces the scalding risk when personnel clean the valve core;

[0018] (2) The window-shaped through-hole adopts a design with a bottle-shaped closed figure as the orthographic projection image, combined with its specific contour curve parameters, such as the radii of the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment, as well as parameters such as the vertical segment spacing and the height difference between segments, to improve the stability and efficiency of the draining process on the basis of meeting the flow characteristics;

[0019] (3) The design of the drain regulating valve assembly of the present utility model, through the reasonable layout of the valve body and the valve cover, and the precise cooperation of components such as the valve stem, the steam turbine auxiliary equipment drain device, the guiding groove, the guide sleeve, and the sealing ring, not only realizes the efficient control of the draining process, but also ensures the sealing performance and reliability of the valve. In particular, the design of the first guiding and sealing structure and the second guiding and sealing structure effectively prevents the leakage of fluid during the adjustment process, further improving the safety of the entire system;

[0020] (4) The drain regulating valve assembly of the present utility model can be widely applied to the auxiliary systems of various steam turbines, such as the condensate system, the feed water system, etc. Its efficient and stable performance can significantly improve the operating efficiency of the entire system, reduce the operating cost, and at the same time provide a strong guarantee for the safe and stable operation of the system. Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0022] Figure 1Schematic structural diagram of the spool of a hydrophobic control valve in the prior art;

[0023] Figure 2 Schematic structural diagram of the hydrophobic device of the auxiliary equipment of a steam turbine in the first embodiment;

[0024] Figure 3 Half-sectional view of the hydrophobic device of the auxiliary equipment of a steam turbine in the first embodiment;

[0025] Figure 4 Orthographic projection image of the window-shaped through hole in the first embodiment;

[0026] Figure 5 Dimension marking diagram of the orthographic projection image of the window-shaped through hole in the first embodiment;

[0027] Figure 6 Schematic overall structural diagram of the hydrophobic control valve in the second embodiment;

[0028] Reference numerals in the figure: 1 - valve body, 2 - inlet nozzle, 3 - outlet section, 4 - outlet nozzle, 5 - valve seat, 6 - hydrophobic device of the auxiliary equipment of a steam turbine, 7 - valve stem, 8 - pin, 9 - valve sleeve, 10 - door gasket, 11 - bolt, 12 - nut, 13 - valve cover, 14 - first sealing ring, 15 - guide sleeve, 16 - second sealing ring, 17.1 - gasket, 17.2 - second gland, 17.3 - first graphite ring, 17.4 - graphite rope, 17.5 - first gland, 17.6 - second graphite ring, 18 - lock nut, 19 - valve support, 20 - opening and closing actuator;

[0029] 6.1 - spool, 6.2 - window-shaped through hole, 6.2.1 - straight section, 6.2.2 - first arc section, 6.2.3 - vertical section, 6.2.4 - second arc section, 6.2.5 - third arc section, 6.2.6 - fourth arc section, 6.2.7 - limiting flange, 6.2.8 - air hole, 6.2.9 - valve stem interface, 6.2.10 - annular clamping groove. Detailed implementation manners

[0030] In order to make the technical problems, technical solutions and advantages to be solved by the present utility model clearer, the following will be described in detail with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, in the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0032] Figure 2 and Figure 3 The first embodiment of the present utility model is shown: a steam turbine auxiliary equipment drain device 6, including a valve core 6.1 with a hollow cylindrical structure. A number of integrally through window-shaped through holes 6.2 are evenly distributed in the circumferential direction at the bottom of the valve core 6.1. The window-shaped through holes 6.2 have an involute part with an increasing opening degree along the opening direction of the drain regulating valve. Among them: the number of the window-shaped through holes 6.2 is 4.

[0033] As Figure 4 and Figure 5 shown, in specific implementation, the orthographic projection image of the window-shaped through hole 6.2 is a bottle-shaped closed figure, and its contour curve includes a straight section 6.2.1. The left and right ends of the straight section 6.2.1 are respectively and smoothly connected to the lower ends of the left and right vertical sections 6.2.3 through the first arc section 6.2.2. The upper ends of the left and right vertical sections 6.2.3 are respectively and smoothly connected to the lower ends of the left and right third arc sections 6.2.5 through the second arc section 6.2.4. The upper ends of the left and right third arc sections 6.2.5 are smoothly connected through the fourth arc section 6.2.6. The radii of the arc surfaces where the first arc and the second arc section 6.2.4 are located are both 3 mm. The radius of the arc surface where the third arc section 6.2.5 is located is 58 mm. The radius of the arc surface where the fourth arc section 6.2.6 is located is 0.5 mm. The distance between the left and right vertical sections 6.2.3 is 18 mm. The height difference between the vertex of the fourth arc section 6.2.6 and the straight section 6.2.1 is 58 mm. The height difference between the vertex of the fourth arc section 6.2.6 and the vertex of the vertical section 6.2.3 is 30 mm. An outer circumferential surface of the valve core 6.1 above the window-shaped through hole 6.2 is convexly formed with a limit flange 6.2.7 adapted to the valve seat 5 of the drain regulating valve. The height difference between the low point of the limit flange 6.2.7 and the vertex of the fourth arc section 6.2.6 is 2 mm. The height difference between the straight section 6.2.1 and the low point of the valve core 6.1 is 9 mm.

[0034] From Figure 3It can be seen that in order to prevent gas from hindering the axial movement of the valve core 6.1, an air hole 6.2.8 communicating with the cylinder cavity is opened at the top of the valve core 6.1, and a valve stem interface 6.2.9 is reserved at the center of the top of the valve core 6.1. In order to improve the sealing performance of the valve core 6.1 after assembly, the outer circumferential surface of the upper part of the valve core 6.1 is sunken to form at least one annular groove 6.2.10 adapted to the sealing ring.

[0035] See also Figure 6 Embodiment 2 discloses a drain regulating valve assembly, including a valve body 1 and a valve cover 13 installed on the valve body 1 through a door cover gasket 10, bolts 11 and nuts 12, the inlet section of the valve body 1 is connected to an inlet pipe, the outlet section 3 of the valve body 1 is connected to an outlet pipe 4, a valve seat 5 is also arranged between the inlet section and the outlet section 3 of the valve body 1, a valve stem 7 is connected to the valve cover 13 through a first guide sealing structure, the valve stem 7 penetrates the valve cover 13 and extends toward the valve body 1, and the turbine auxiliary machine drain device 6 described above is connected at its end through a pin 8, a guide groove for axial movement of the turbine auxiliary machine drain device 6 is also opened at the bottom of the valve cover 13, and a second guide sealing structure is also arranged between the groove wall of the guide groove and the turbine auxiliary machine drain device 6.

[0036] In specific implementation, a valve frame 19 is arranged on the valve cover 13 through a lock nut 18, and an opening and closing actuator 20 connected to the head end of the valve stem 7 is arranged on the valve frame 19. The first guide sealing structure includes a first pressure flange 17.5, a second pressure flange 17.2, a gasket 17.1, a first graphite ring 17.3, a graphite rope 17.4, and a second graphite ring 17.6 arranged in sequence in the lock nut 18; the second guide sealing structure includes a guide sleeve 15 and a valve sleeve 9 arranged between the groove wall of the guide groove and the steam turbine auxiliary machine drain device 6, and a first sealing ring 14 and a second sealing ring 16 arranged between the guide sleeve 15 and the steam turbine auxiliary machine drain device 6.

[0037] In this embodiment, the first guide seal structure adopts a combination of multiple layers of sealing materials to improve the reliability and durability of the seal. Specifically, the first pressure flange 17.5 and the second pressure flange 17.2 are used to provide an initial compression force so that the graphite rope 17.4 and the graphite ring can fit tightly between the valve stem 7 and the valve cover 13 to form a preliminary seal. The gasket 17.1 is used to adjust the compression amount to ensure that the sealing effect is within an appropriate range.

[0038] In the selection of the graphite rope 17.4, we chose high-purity and high-density materials to ensure its stable sealing performance under high-temperature and high-pressure environments. At the same time, the winding method of the graphite rope 17.4 has also been carefully designed to ensure that it can be evenly distributed around the valve stem 7, thereby avoiding leakage caused by excessive local pressure.

[0039] The second guiding and sealing structure introduces the design of the guiding sleeve 15. The guiding sleeve 15 is made of wear-resistant and high-temperature-resistant materials, and its inner wall is closely attached to the outer surface of the steam turbine auxiliary equipment drainage device 6 to form an effective guiding and sealing barrier. Between the guiding sleeve 15 and the steam turbine auxiliary equipment drainage device 6, we set the first sealing ring 14 and the second sealing ring 16. These two sealing rings are made of different materials to adapt to different working environments and sealing requirements.

[0040] In summary, due to the adoption of the specific window-shaped through-hole 6.2 design in the steam turbine auxiliary equipment drainage device 6 of the present utility model, the flow area of each through-hole is increased, and its opening degree increases with the opening direction of the drainage regulating valve. Such a design can not only ensure the unchanged flow characteristics of the drainage regulating valve, but also is not easily blocked, reducing the time for shutting down the high-pressure heater, improving the economy of the unit, and at the same time reducing the risk of scalding when personnel clean the valve core 6.1; the window-shaped through-hole 6.2 adopts a design with a bottle-shaped closed figure as the orthographic projection image, combined with its specific contour curve parameters, such as the radii of the first arc segment 6.2.2, the second arc segment 6.2.4, the third arc segment 6.2.5, and the fourth arc segment 6.2.6, as well as the spacing of the vertical segment 6.2.3 and the height differences of each segment, etc., to improve the stability and efficiency of the drainage process on the basis of meeting the flow characteristics; the design of the drainage regulating valve assembly of the present utility model, through the reasonable layout of the valve body 1 and the valve cover 13, and the precise cooperation of components such as the valve stem 7, the steam turbine auxiliary equipment drainage device 6, the guiding groove, the guiding sleeve 15, and the sealing ring, not only realizes the efficient control of the drainage process, but also ensures the sealing performance and reliability of the valve. Especially the design of the first guiding and sealing structure and the second guiding and sealing structure effectively prevents the leakage of fluid during the adjustment process, further improving the safety of the entire system; the drainage regulating valve assembly of the present utility model can be widely applied to the auxiliary systems of various steam turbines, such as the condensate system, the feed water system, etc. Its high-efficiency and stable performance can significantly improve the operating efficiency of the entire system, reduce the operating cost, and at the same time provide a strong guarantee for the safe and stable operation of the system.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and the description of the present invention.

Claims

1. A drain device for auxiliary equipment of a steam turbine, comprising a valve core in a hollow cylindrical structure, characterized in that: A number of integrally-through window-shaped through-holes are evenly distributed in the circumferential direction at the bottom of the valve core. The window-shaped through-holes have an involute portion with an increasing opening degree along the opening direction of the drain regulating valve.

2. The steam turbine auxiliary equipment drain device according to claim 1, characterized in that: The orthographic projection image of the window-shaped through-hole is a bottle-shaped closed figure, and its contour curve includes a straight section. The left and right ends of the straight section are respectively smoothly connected to the lower ends of the left and right vertical sections through the first arc sections. The upper ends of the left and right vertical sections are respectively smoothly connected to the lower ends of the left and right third arc sections through the second arc sections. The upper ends of the left and right third arc sections are smoothly connected through the fourth arc section.

3. The steam turbine auxiliary equipment drain device according to claim 2, characterized in that: The radius of the arc surface where the first arc and the second arc section are located is 3 mm. The radius of the arc surface where the third arc section is located is 58 mm. The radius of the arc surface where the fourth arc section is located is 0.5 mm. The distance between the left and right vertical sections is 18 mm. The height difference between the vertex of the fourth arc section and the straight section is 58 mm. The height difference between the vertex of the fourth arc section and the vertex of the vertical section is 30 mm.

4. The steam turbine auxiliary equipment drain device according to claim 3, characterized in that: On the outer circumferential surface of the valve core above the window-shaped through-hole, a section of limit flange adapted to the valve seat of the drain regulating valve is convexly formed.

5. The steam turbine auxiliary equipment drain device according to claim 4, characterized in that: The height difference between the low point of the limit flange and the vertex of the fourth arc section is 2 mm. The height difference between the straight section and the low point of the valve core is 9 mm.

6. The steam turbine auxiliary equipment drain device according to any one of claims 1-5, characterized in that: An air hole communicating with its cylinder cavity is provided at the top of the cylinder of the valve core, and a valve rod interface is also reserved at the center of the top of the cylinder of the valve core.

7. The steam turbine auxiliary equipment drain device according to claim 6, characterized in that: At least one annular groove adapted to the sealing ring is recessed on the outer circumferential surface of the upper part of the valve core.

8. A hydrophobic regulating valve assembly, comprising a valve body and a valve cover installed on the valve body through a gland gasket, bolts and nuts, an inlet nozzle is connected to the inlet section of the valve body, an outlet nozzle is connected to the outlet section of the valve body, and a valve seat is further arranged between the inlet section and the outlet section of the valve body, characterized in that: A valve rod is connected to the valve cover through a first guiding and sealing structure. The valve rod penetrates through the valve cover and extends towards the valve body, and a drain device for auxiliary equipment of a steam turbine as described in any one of claims 1-7 is connected to its end through a pin. A guiding groove for the axial movement of the drain device for auxiliary equipment of a steam turbine is also provided at the bottom of the valve cover. A second guiding and sealing structure is also provided between the groove wall of the guiding groove and the drain device for auxiliary equipment of a steam turbine.

9. The hydrophobic regulating valve assembly according to claim 8, characterized in that: A valve frame is provided on the valve cover through a lock nut, and an opening and closing actuator connected to the head end of the valve rod is provided on the valve frame.

10. The hydrophobic regulating valve assembly according to claim 8 or 9, characterized in that: The first guiding and sealing structure includes a first gland, a second gland, a gasket, a first graphite ring, graphite rope, and a second graphite ring sequentially arranged in the lock nut. The second guiding and sealing structure includes a guide sleeve and a valve sleeve provided between the groove wall of the guiding groove and the drain device for auxiliary equipment of a steam turbine, and a first sealing ring and a second sealing ring provided between the guide sleeve and the drain device for auxiliary equipment of a steam turbine.

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